JP5395766B2 - Wavelength multiplexed optical address display - Google Patents

Description

  The present invention relates to a wavelength multiplexed optical addressed display, and more particularly to a wavelength multiplexed optical addressed display that performs multiple scanning using light of a plurality of wavelengths.

  2. Description of the Related Art Conventionally, displays such as plasma displays and liquid crystal displays have been increased in screen size and ultra-high definition. In a typical matrix display, a plurality of scan electrodes and data electrodes are orthogonal. As the display becomes higher in definition, the distance between the electrodes becomes narrower, and a voltage applied to an electrode adjacent to the electrode may be a noise source. Also, as the display becomes larger, the electrodes become thinner and longer, so the wiring resistance of the electrodes increases. In addition, the stray capacitance of the panel also increases. For this reason, the time constant of the voltage pulse determined by the wiring resistance and the stray capacitance becomes large, and even if a rectangular wave voltage pulse is applied, the waveform collapses at the panel end far from the voltage supply unit. For this reason, switching may not be performed at high speed, or sufficient voltage may not be applied to the pixels, and image display may not be possible.

  In the plasma display, a time division gray scale display method is used. In order to display an image with 256 gradations, at least eight subfields (SF) are required in one field. Each subfield includes an initialization period in which the state of the discharge space of all the subpixels is made uniform, a writing period in which light emission is selected for each subpixel, and each selected subpixel emits light to display an image. It consists of a display period. In the writing period, scanning is performed by the scanning electrode and the data electrode. A write voltage is sequentially applied to the scan electrodes and a data voltage is applied to the data electrodes to perform write discharge, and light emission / non-light emission is selected in all subpixels. Thereafter, during the display period, a voltage is applied alternately to all the scan electrodes and sustain electrodes to perform display discharge. As the number of scanning lines increases as the display becomes higher in definition, the writing period in each subfield becomes longer. In order to perform initialization, writing, and display within one field, the display period may be shortened, but the luminance is lowered. In addition, the voltage pulse that causes the write discharge requires a predetermined time. For example, when driving a plasma display panel having a voltage pulse width of 0.5 μsec, 4000 scanning lines, and 8 subfields, a writing period of 16 msec is required. Usually, since one field is 16.7 msec, almost all of one field becomes a writing period.

  In a field emission display, for example, scanning is performed using a gate electrode as a scanning electrode and a cathode electrode as a data electrode. When a data voltage is applied to the cathode electrode while a scanning voltage is applied to the gate electrode, electrons are emitted from the cold cathode, and the phosphor is excited to emit light. Normally, display is performed by selecting one scan electrode and applying a data voltage to each data electrode when a scan voltage is applied to the scan electrode. Therefore, the light emission period of each scanning line is one horizontal scanning period (1H). When the number of scanning lines increases with the increase in the definition of the display, one horizontal scanning period is shortened, so that the luminance is lowered.

  In order to solve such a problem, a wavelength multiplexing optical address type display that addresses using light of a plurality of wavelengths has been proposed (see Patent Document 1). In the optical address type display described in Patent Document 1, the data electrode is separated at each pixel, and a photoconductive film, a transparent electrode, a color filter, and a waveguide are provided in that lower layer in order from the top. In the waveguide, light of a plurality of wavelengths on which data of different scanning lines are superimposed is propagated, and light transmitted through the color filter is selected. The resistance value of the photoconductive film decreases due to the light transmitted through the color filter, and a voltage is applied to the data electrode. By synchronizing the data of each scanning line superimposed on the light of a plurality of wavelengths and the voltage applied to the plurality of scanning electrodes, the plurality of scanning lines can be addressed simultaneously.

JP 2006-163780 A

  However, the wavelength multiplexed optical address type display described in Patent Document 1 described above has a problem in that the structure is complicated because light from the light source is branched into a plurality of light by a branching device and optical switching is performed depending on data. was there. In addition, since only light of the wavelength to be multiplexed is required, as the number of scanning lines that can be addressed at the same time increases, the number of light sources increases, resulting in structural complexity and an increase in size and cost. There was a problem that.

  Accordingly, an object of the present invention is to provide a wavelength-multiplexed optical address type display having a simple configuration that does not make the structure complicated and large even if the number of wavelengths to be multiplexed increases.

In order to achieve the above object, a wavelength division multiplexing optical address display according to a first invention includes a data electrode divided for each subpixel, a photoconductive film provided under the data electrode, and the photoconductive film. A transparent electrode provided in a lower layer of the transparent electrode; a plurality of types of wavelength filters provided in a lower layer of the transparent electrode in parallel with the first direction and corresponding to light of a plurality of wavelengths; and the first direction; A plurality of waveguides provided in parallel in a second direction orthogonal to each other, and when light having a wavelength that passes through the wavelength filter enters the waveguide and the resistance value of the photoconductive film is reduced An image display unit in which a voltage applied to the transparent electrode is applied to the data electrode to perform addressing;
A two-dimensional array in which light-emitting elements that emit any one of the plurality of wavelengths of light are two-dimensionally arranged, and a light source unit that enters the light emitted from the two-dimensional array into the waveguide. It is characterized by that.

  Accordingly, light having a plurality of wavelengths can be emitted using the light source of the two-dimensional array, and a plurality of lights can be input to the image display unit using a simple and small light source.

A second invention is a wavelength division multiplexing optical address display according to the first invention,
In the two-dimensional array, the light emitting elements that emit light of the same wavelength are arranged in rows extending in the first direction corresponding to the arrangement of the plurality of types of wavelength filters, The rows formed by the light emitting elements are arranged in parallel to the first direction.

  Thereby, light of the same wavelength can be output in each row, and addressing can be performed using light of a plurality of wavelengths in the horizontal direction of the image display means.

A third invention is a wavelength division multiplexing optical address display according to the second invention,
The two-dimensional array has one light emitting element that emits light of the plurality of wavelengths in each column extending in a direction orthogonal to the first direction.

  As a result, light of a plurality of wavelengths can always be output in each column, and the address of the image display unit can be performed for all the data electrodes.

A fourth invention is the wavelength division multiplexing optical address display according to any one of the first to third inventions,
The image display unit includes scan electrodes provided in parallel with the first direction corresponding to the sub-pixels,
The light source unit addresses the light emitting elements of the two-dimensional array in synchronization with scanning performed by applying a predetermined voltage to the scan electrodes, and simultaneously inputs the light of the plurality of wavelengths into the waveguide. Features.

  Thereby, the scanning of the image display unit and the address of the light source unit can be synchronized, and the address of the image display unit can be controlled at an appropriate timing by the address of the light source unit.

A fifth invention is a wavelength division multiplexing optical address display according to the fourth invention,
The address of the light emitting element of the light source unit is performed by frame sequential scanning.

  Thereby, the address of the light source unit can be performed very easily in units of planes, and the address of the entire image display unit can be easily performed.

A sixth invention is the wavelength division multiplexing optical display according to the fourth invention,
The address of the light emitting element of the light source unit is performed by line sequential scanning.

  Accordingly, it is possible to perform addressing appropriately while reducing the number of drivers of the light emitting elements and simplifying the configuration of the light source unit.

A seventh invention is the wavelength division multiplexing optical display according to the sixth invention,
The light source unit is a liquid crystal display or an organic EL display.

  Accordingly, a liquid crystal display or an organic EL display that performs line sequential scanning by matrix driving can be used as a light source, and the address of the image display unit can be appropriately controlled with a simple configuration using an existing display. it can.

An eighth invention is the wavelength multiplexing optical display according to any one of the first to seventh inventions,
A coupler is provided between the light source unit and the waveguide.

  Thereby, it is possible to easily and appropriately combine and multiplex light of a plurality of wavelengths, and the address of the image display unit can be reliably performed by the light source unit.

  According to the present invention, it is possible to perform multiple scanning of an image display unit reliably and quickly using a simple light source.

It is the perspective view which showed an example of the data electrode structure of the wavelength division multiplexing optical address type | mold display which concerns on Example 1 of this invention. 1 is a diagram illustrating a configuration of a wavelength division multiplexing optical address display according to Embodiment 1. FIG. FIG. 2A is a cross-sectional configuration diagram illustrating an example of a wavelength division multiplexing optical address display according to the first embodiment. FIG. 2B is a plan configuration diagram of a light source unit and an image display unit of the wavelength multiplexing optical address display according to the first embodiment. FIG. 3 is a diagram illustrating an example of a pixel arrangement of a light source unit and an image display unit of a wavelength multiplexed optical address display according to the first embodiment. It is the figure which showed an example of the voltage waveform applied to each electrode. FIG. 4A is a diagram showing a voltage waveform of the scan electrode on the screen display unit side. FIG. 4B is a diagram illustrating a voltage waveform on the light source unit side. It is the figure which showed the structure of an example of the wavelength division multiplexing optical address type | mold display which concerns on Example 2 of this invention. FIG. 5A is a cross-sectional configuration diagram of the wavelength division multiplexing optical address display according to the second embodiment. FIG. 5B is a plan configuration diagram of the light source unit and the image display unit of the wavelength multiplexing optical address type display according to the second embodiment. It is the figure which showed the structure of an example of the wavelength multiplexing optical address type | mold display which concerns on Example 3 of this invention. FIG. 6A is an overall configuration diagram of a wavelength multiplexed optical address display according to the third embodiment. FIG. 6B is a plan configuration diagram of the light source unit and the image display unit of the wavelength multiplexing optical address type display according to the third embodiment. FIG. 10 is a diagram illustrating a pixel arrangement of a light source unit 162 and an image display unit 122 of a wavelength multiplexing optical address display according to a third embodiment. It is the figure which showed an example of the voltage waveform applied to each electrode of a light source part and an image display part.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an example of a data electrode structure of a wavelength division multiplexing optical address display according to Embodiment 1 of the present invention. In FIG. 1, the data electrode structure portion of the wavelength multiplexing optical address display according to the first embodiment includes a data electrode 10, a photoconductive film 20, a transparent electrode 30, a color filter 40, a waveguide 50, and a substrate 60. With. The data electrode 10 is divided into subpixels, the photoconductive film 20 is disposed below the data electrode 10, the transparent electrode 30 is disposed below the photoconductive film 20, and the color filter 40 is disposed below the transparent electrode 30. The waveguide 50 is disposed in the lower layer of the color filter 50, and the substrate 60 is disposed in the lowermost layer. Each layer has been described in order downward from the data electrode 10 arranged at the uppermost position. However, as a formation order, the waveguide 50, the color filter 40, the transparent electrode 30, the photoconductive film 20, and the like are sequentially formed on the substrate 60. The manufacturing order is such that the data electrodes 10 are stacked.

  The data electrode 10 is an electrode to which image data is supplied. Therefore, the data electrode 10 is divided for each subpixel and provided independently. The photoconductive film 20 is a film whose electrical resistance changes according to the received light when the light is received using the photoelectric effect. The transparent electrode 30 is a transparent electrode through which light is transmitted. For example, ITO (Indium Tin Oxide) may be used. In addition, since the transparent electrode 30 is an electrode for supplying a predetermined potential, the entire surface may be configured as a solid film having conductivity. The color filter 40 is a wavelength filter that transmits light of a predetermined wavelength or wavelength region according to the color. The wavelength or wavelength region of the light transmitted by the color filter 40 is determined according to the color wavelength range. For example, as shown in FIG. 1, when the yellow color filter 40Y, the red color filter 40R, and the green color filter 40G are provided so as to extend in parallel to the row direction of the data electrode 10 (horizontal direction of the screen). The color filters 40Y, 40R, and 40G in each row transmit light in the wavelength range of the target color. For example, in this way, the color filter 40 corresponding to a different wavelength or wavelength region may be provided for each row. The waveguide 50 is a transmission path for propagating light. The substrate 60 is provided to form and support an upper layer structure of the waveguide 50 or more, and for example, a glass substrate or the like may be used.

  In the data electrode structure having such a configuration, when three types of a yellow filter, a red filter, and a green filter are used for the color filter 40, light including any one of yellow, red, and green wavelength components is input to the waveguide 50. When incident, the light passes through the corresponding color filter 40 and the transmitted light is irradiated onto the photoconductive film 20. When the photoconductive film 20 receives light, it generates free electrons and the electrical resistance value decreases. As a result, the data electrode 10 and the transparent electrode 30 are electrically connected, and the voltage applied to the transparent electrode 30 is supplied to the data electrode 10 to perform addressing. That is, light of a plurality of wavelengths in which data of different scanning lines (not shown in FIG. 1 and extending in parallel with the color filter 40) is superimposed on each column of the waveguide 50 (vertical direction of the screen). As a result, light transmitted through the color filter 40 is selected, and a predetermined data electrode 10 corresponding to the data of the scanning line is brought into conduction with the transparent electrode 30.

  FIG. 2 is a diagram showing the configuration of the wavelength division multiplexing optical address display according to the first embodiment of the present invention. FIG. 2A is a cross-sectional configuration diagram illustrating an example of a wavelength multiplexed optical address display according to the first embodiment, and FIG. 2B illustrates a light source unit of the wavelength multiplexed optical address display according to the first embodiment. 2 is a plan configuration diagram of 160 and an image display unit 120.

  2A, the wavelength division multiplexing optical address display according to the first embodiment includes an image display unit 120, a light source unit 160, and a coupler 170. In the wavelength division multiplexing optical address display according to the first embodiment, the image display unit 120 is configured as an organic EL (Electro-Luminescence) display, and the light source unit 160 includes electro-optic elements (EO elements) arranged two-dimensionally. An example configured as an electro-optic element array (EO element array) will be described.

  In addition to the substrate 60, the waveguide 50, the color filter 40, the transparent electrode 30, the photoconductive film 20, and the data electrode 10 described in FIG. 1, the image display unit 120 includes a scanning electrode 70, an emitter electrode 80, and an organic compound layer. 90, a transparent electrode 100, and a substrate 110. The light source unit 160 includes a backlight 130, a color filter 140, and an electro-optic element (EO element) array 150. Further, a coupler 170 may be provided between the light source unit 160 and the image display unit 120 as necessary.

  In FIG. 2A, the substrate 60, the waveguide 50, the color filter 40, the transparent electrode 30, the photoconductive film 20, and the data electrode 10 of the image display unit 120 are the same components as in FIG. The same reference numerals as in FIG.

  The scanning electrode 70 is an electrode for selecting a sub-pixel that performs image display. The scanning electrode 70 is provided corresponding to the sub-pixel and extending in the horizontal direction (lateral direction) of the screen in parallel with the color filter 40.

  The emitter electrode 80 is an electrode for supplying image data to each subpixel. The data electrode 10, the scan electrode 70, and the emitter electrode 80 constitute a TFT (Thin Film Transistor).

  The organic compound layer 90 constitutes a light emitting diode made of an organic compound, and is a light emitting layer that emits light by excitons (excitons) generated by recombination of electrons and holes injected into the organic compound. The organic compound layer 90 may be provided with a phosphor extending in the column direction (vertical direction of the screen) in parallel with the waveguide 50. For example, the phosphor may be provided with a phosphor of a color necessary for image display for each column, and a subpixel may be configured for each data electrode 10. In addition, the phosphor may be provided with phosphors of three colors of red (R), green (G), and blue (B), for example.

  The transparent electrode 100 is an electrode that transmits light, and may be configured as a solid film that covers the entire surface in the same manner as the transparent electrode 30. The substrate 110 may be formed of a glass substrate or the like, similar to the substrate 60.

  Next, the light source unit 160 will be described. The backlight 130 is a light emitting unit that emits white light. The color filter 140 is a wavelength filter that transmits light of a predetermined wavelength or wavelength region, and a wavelength filter corresponding to the color filter 40 of the image display unit 120 is used. The electro-optical element (EO element) array 150 is a light-emitting array in which electro-optical elements are two-dimensionally arranged as pixels 155 as shown in FIG. As a configuration, a white backlight 130 is used on the back surface of the electro-optic element array 150, and a color filter 140 that transmits each wavelength is provided along the pixels 155 in the horizontal direction (horizontal direction). As shown in FIG. 2B, in the example of FIG. 2, there are three pixel columns in the longitudinal direction (vertical direction) of the electro-optic element array 150. As a result, three-wavelength multiplexing can be achieved, and three rows of sub-pixels can be addressed simultaneously. Each electro-optic element array 150 is electrically wired so that it can be controlled independently.

  Light from the pixel array in the vertical direction of the electro-optic element array 150 is coupled by a coupler 170 and connected to the waveguide 40 of the image display unit 120 configured as an organic EL display. With respect to the columns of the electro-optic element array 150, light of each wavelength may be transmitted using a plurality of waveguides and connected to one waveguide 50 of the image display unit 120.

  2B, the planar structure of the image display unit 120 is such that a plurality of scanning electrodes 70 extend in parallel in the row direction (X direction) along the data electrode 10, and the data electrode 10 and The color filter 40 is provided for each color in parallel with the scan electrode 70 so as to include the scan electrode 70. The arrangement of the color filter 40 and the color filter 140 is the same in the horizontal X direction, and the Z direction of the light source unit 160 perpendicular to the X direction is the same as the Y direction arrangement of the image display unit 120. A pixel 125 is formed at an intersection including the data electrode 10, the scan electrode 70, the color filter 40, and the waveguide 50.

  Next, with reference to FIGS. 3 and 4, a method of driving the wavelength division multiplexing optical address display according to the first embodiment having such a configuration will be described. FIG. 3 is a diagram illustrating an example of a pixel arrangement of the light source unit 160 and the image display unit 120 of the wavelength division multiplexing optical address display according to the first embodiment. FIG. 4 is a diagram showing an example of a voltage waveform applied to each electrode. 4A is a diagram showing a voltage waveform on the image display unit 120 side, and FIG. 4B is a diagram showing a voltage waveform on the light source unit 160 side.

Here, in each pixel 155 of the electro-optic element array 150, when a voltage is applied, the optical axis is bent and light is guided to the waveguide 50. Further, the lower portion of the transparent electrode 30 of the photoconductive film 20 of the image display unit 120, and the voltage V _FD is applied. 3, the scanning electrode 70 displays S1, S2, S3... From the first row, each pixel 125 of the image display unit 120 displays a matrix display of F11 to F63, and the electro-optic element array 150 includes L11 to L11. It is assumed that L33 matrix display is performed. The first row of the light emitting element L11~L13 wavelength lambda ₁ of the light source unit 160, the second line of the light emitting element L21~L23 wavelength lambda ₂ of light, the third line of the light emitting element L31~L33 wavelength lambda ₃ light is emitted. The waveguide 50 of the image display unit 120 is provided corresponding to each color phosphor provided in the organic semiconductor layer 90. The waveguide 50 formed below the red phosphor is R, the waveguide 50 formed below the green phosphor is G, and the waveguide 50 formed below the blue phosphor is B. The reference numerals are attached.

As shown in FIG. 4 (A), at time _{t 0,} to apply the voltage _{V FS} to S1~S3 scan electrodes 70 of the image display unit 120. At the same time, as shown in FIG. 4B, a voltage V _D is applied to the pixels L11, L13, L21, L22, and L32 of the electro-optic element array 150 of the light source unit 160.

In FIG. 3, the light of wavelength λ _{1 is} the waveguide 50 of the phosphors R and B of the image display unit 120, the light of wavelength λ _{2 is} the waveguide 50 of the phosphors R and G, and the light of wavelength λ ₃ is the phosphor G. It propagates to the waveguide 50. Therefore, the pixels F11 of the image display unit 120 that transmits light of wavelength _{λ 1, F41, F13, F43} , pixel F21 that transmits light of wavelength lambda _2, F51, F22, pixels which transmits F52 and the wavelength lambda ₃ of the light In F <b> 32 and F <b> 62, a voltage V _FD that is a voltage applied to the transparent electrode 30 is applied to the data electrode 10. Since the voltage V _FS is applied to the scan electrodes S1 to S3 of the image display unit 120, the pixels F11, F13, F21, F22, and F32 emit light.

Next, at time _{t 1,} as shown in FIG. 4 (A), for applying a voltage _{V FS} to the scan electrodes S4~S6 the image display unit 120. Also. As shown in FIG. 4B, it is assumed that the voltage V _D is simultaneously applied to the pixels L12, L13, L21, L22, L23, L31, and L33 of the light source unit 160. At this time, the voltages of the scan electrodes S1 to S3 are set to 0 as shown in FIG.

3, light having a wavelength λ _{1 is} a waveguide 50 corresponding to the phosphors G and B of the image display unit 120, light having a wavelength λ _{2 is} a waveguide 50 corresponding to the phosphors R, G, and B, and wavelength λ _3. Of the light propagates to the waveguide 50 corresponding to the phosphors R and B. Accordingly, the pixel F12 of the image display unit 120 that transmits light of wavelength _{λ 1, F42, F13, F43} , pixel F21 that transmits light of wavelength _{λ 2, F51, F22, F52} , F23, F53, wavelength lambda ₃ of the light In the pixels F <b> 31, F <b> 61, F <b> 33, and F <b> 63 that pass through, the voltage _VFD is applied to the data electrode 10 from the transparent electrode 30. Since the voltage _{V FS} is applied to the scanning electrodes S4~S6 of the image display unit 120, the pixel F42, F43, F51, F52, F53, F61, F63 emits light. By sequentially repeating such driving, the three scanning electrodes 70 of the image display unit 120 can be simultaneously scanned to display an image.

  In this way, the address of the light source unit 160 is obtained by surface sequential scanning that sequentially scans for each scanning field that changes at predetermined times, and the three scanning electrodes are synchronized with the scanning of the image display unit 120. 70 can be scanned simultaneously.

  In FIG. 3, since an example in which addressing is performed using light of three different wavelengths has been described, the electro-optical element array 150 of the light source unit 160 is an electro-optical device including three rows of pixels (light-emitting elements) 155. Although it is configured as the element array 150, in the case where addressing is performed using light of different wavelengths, the electro-optical element array 150 having m columns of pixels may be configured. In addition, regarding the row length, that is, the number of columns, n columns of pixels may be arranged in accordance with the number of pixels n in the horizontal direction of the image display unit 120. As a result, it is possible to simultaneously address m rows of scanning electrodes 70 by plane sequential scanning using the electro-optic element array 150 in which pixels are arranged in m × n, and high-speed addressing can be performed with a simple array. Become.

  As described above, according to the wavelength light multiple address type display according to the first embodiment, it is possible to simultaneously address the plurality of scanning electrodes 70 using the electro-optic element array 150, and easily and at high speed. Address can be done.

  FIG. 5 is a diagram showing a configuration of an example of a wavelength division multiplexing optical address display according to Embodiment 2 of the present invention. FIG. 5A is a diagram illustrating a cross-sectional configuration of an example of a wavelength multiplexed optical address display according to the second embodiment. FIG. 5B is an example of a wavelength multiplexed optical address display according to the second embodiment. It is the figure which showed the plane structure of the light source part of this, and an image display part.

  The wavelength division multiplexing optical address display according to the second embodiment is an example in which the light source unit 161 is configured as an organic EL display 151 and the image display unit 121 is configured as a plasma display.

  5A and 5B, the organic EL display 151 used in the light source unit 161 is a self-luminous display, and phosphors that emit light of respective wavelengths along the pixels 156 in the horizontal direction. Is applied. Further, it is assumed that the vertical pixel columns of the organic EL display 151 are configured by three columns that emit light of three different wavelengths. Thereby, incident light can be multiplexed by three wavelengths. In FIG. 5A, light from the pixel array in the vertical direction of the organic EL display 151 is coupled by a coupler 171 and connected to the waveguide 51 of the image display unit 121. This configuration may be configured such that light of each wavelength is transmitted using a plurality of waveguides and connected to the waveguide of the image display unit 121.

  The data electrode 11 of the image display unit 121 that is a plasma display is separated by each sub-pixel 126. The lower part of the data electrode 11 is composed of the photoconductive film 21, the transparent electrode 31, the color filter 41, and the waveguide 51 as described in FIG. A scanning electrode 71 and a sustaining electrode 72 are formed on the upper substrate 111. In the space between the scan electrode 71 and the sustain electrode 72 and the data electrode 11, a discharge cell 91 is formed to constitute a pixel 126. Each color filter 41 is set to transmit each emission spectrum of the organic EL display 151. Therefore, each column of the organic EL display 151 emits light that passes through the color filter 41 arranged corresponding to the sub-pixel 126 that emits light in each column of the image display unit 121, thereby addressing the image display unit 121. It can be performed. Note that the driving method itself is substantially the same as that of the wavelength-multiplexed optical address display according to the first embodiment, and a description thereof will be omitted.

  According to the wavelength division multiplexing display according to the second embodiment, by using the self-luminous organic EL display 151 as a two-dimensional light emitting element array of the light source 161, the light source 161 is configured to be simple and thin. Multiple simultaneous addresses are possible for the scanning electrodes 71 of the image display unit 121. As a result, even when a large-screen plasma display panel is used for the image display unit 121, the address discharge can be completed within the write discharge period of the subfield, and a sufficient period for performing the display discharge is ensured. be able to.

  FIG. 6 is a diagram showing a configuration of an example of a wavelength division multiplex optical address display according to Embodiment 3 of the present invention. FIG. 6A is a diagram illustrating an overall configuration of an example of a wavelength multiplexed optical address display according to the third embodiment. FIG. 6B illustrates a light source of the wavelength multiplexed optical address display according to the third embodiment. It is the figure which showed the plane structure of a part and an image display part.

  The wavelength multiplexed optical address display according to the third embodiment is an example in which the light source unit 162 is configured as an active matrix liquid crystal panel and the image display unit 122 is configured as a field emission display.

  As shown in FIG. 6A, the wavelength division multiplexing optical address display according to the third embodiment includes an image display unit 122 configured as a field emission display, and a light source unit 162 configured as an active matrix liquid crystal panel. Have The light source unit 162 and the image display unit 122 are connected by a coupler 172 as necessary.

  The image display unit 122 includes a photoelectric conductive film 22, a transparent electrode 32, a color filter 42, a waveguide 52, and a substrate 62 below the data electrode 12, similarly to the configuration of FIG. 1. In addition, an emitter 82 and a scanning electrode 73 are provided on the lower substrate 62 side above the data electrode 12. Further, a transparent electrode 102 and a phosphor 92 are formed on the lower surface of the upper substrate 112. When electrons are emitted from the emitter 82 and pass through a hole formed in the scanning electrode 73 and collide with the phosphor 92, the phosphor 92 emits light to display an image.

  The light source unit 162 using a liquid crystal panel uses a white backlight 132, and a color filter 142 that transmits each wavelength is provided along a scanning electrode 153 (see FIG. 6B) extending in the row direction. It has been. In FIG. 6B, the number of scanning electrodes 153 of the liquid crystal panel 152 is three. Thereby, it can be configured as a two-dimensional light emitting element array capable of three-wavelength multiplexing. In the column direction, data electrodes 154 are provided in each column. The data electrodes 154 correspond to the sub-pixel columns of the image display unit 122, and red, green, and blue data electrodes 154 are provided in each column.

  The light source 162 and the waveguide 52 of the image display unit 122 are connected by a coupler 172. Thereby, the light from the pixel 157 along the data electrode 154 of the liquid crystal panel can be coupled by the coupler 172 and can be incident on the waveguide 52 of the image display unit 122. Instead of providing the coupler 172, light of each wavelength may be transmitted using a plurality of waveguides and connected to one waveguide 52 of the image display unit 122.

  Next, a method for driving the wavelength division multiplexing optical address display according to the third embodiment will be described with reference to FIGS. FIG. 7 is a diagram illustrating a pixel arrangement of the light source unit 162 and the image display unit 122 of the wavelength division multiplexing optical address display according to the third embodiment. FIG. 8 is a diagram illustrating an example of a voltage waveform applied to each electrode of the light source unit 162 and the image display unit 122.

In FIG. 7, the scan electrodes 153 of each wavelength of the light source unit 162 to display _{S LCD λ 1, S LCD λ} 2 and _{S LCD} lambda _3, the data electrodes 154 of each column _D R, and _{D G} and _{D B} The scanning electrodes 73 in each row of the image display unit 122 are represented by S _FED 1, S _FED 2, S _FED 3..., And the waveguides 52 corresponding to the phosphors 92 of the respective colors are represented by R, G, and B.

As shown in FIG. 8, at time t ₀ , the voltage V _FS is applied to the scan electrode S _FED 1 of the image display unit 122. At the same time, the voltage _{V LS} and the data electrodes _D R to the scanning electrodes _{S LCD} lambda ₁ of the light source unit 152 applies a voltage _{V LD} to _{D B.} No voltage is applied to the data electrodes D _G.

In FIG. 7, the light is turned on at the pixels L <b> 11 and L <b> 13 of the light source unit 162, and the light with the wavelength λ <b> ₁ propagates to the phosphors R and B of the image display unit 122. Therefore, in the pixel F11, F13, F 41, F 43 of the image display unit 122 that transmits light of wavelength lambda _1, the voltage _{V FD} is applied voltage of the transparent electrode 32 to the data electrode 12 is applied. Since the voltage V _FS is applied to the scan electrode S _FED 1 of the image display unit 122, electrons are emitted from the pixels F11 and F13, and the phosphor 92 provided at a position facing the emitter 82 emits light. Since no voltage is applied to the scan electrode S _FED 4, no electrons are emitted from the pixels F 41 and 43, and the phosphor 92 does not emit light.

As shown in FIG. 8, at time t ₁ , a voltage V _FS is applied to the scan electrode S _FED 2 of the image display unit 122. At the same time, it applies the voltage _{V LD} to the scan electrodes _{S LCD} lambda ₂ of the liquid crystal panel 152 to the voltage _{V LS} and the data electrodes _{D G.} The voltage of scan electrodes _{S LCD} lambda ₁ and the data electrodes _D R, the voltage of the _{D B} is zero.

In FIG. 7, the pixel L < _b > 22 of the liquid crystal panel 152 is turned on, and the light with the wavelength λ < _b > ₂ propagates to the waveguide 52 of the phosphor G of the image display unit 122. In the pixels F < _b > 22 and F < _b > 52 of the image display unit 122 that transmits light having the wavelength λ < _b > _2, the voltage V _FD is applied to the data electrode 12 from the transparent electrode 32. Since the voltage V _FS is applied to the scan electrode S _FED 2 of the image display unit 122, electrons are emitted from the emitter 82 of the pixel F22, and the phosphor 92 emits light. Since no voltage is applied to the scan electrode S _FED 5, no electrons are emitted from the emitter 82 of the pixel F 52, and the phosphor 92 does not emit light. At this time, since the liquid crystal panel 152 is an active matrix type, L11 and L13 remain on. Therefore, the light of wavelength λ ₁ propagates through the waveguides 52 of the phosphors R and B of the image display unit 122. Further, the voltage V _FS is still applied to the scan electrode S _FED 1 of the image display unit 122. Therefore, light emission continues in the pixels F11 and F13.

As shown in FIG. 8, at time t ₂ , the voltage V _FS is applied to the scan electrode S _FED 3 of the image display unit 122. At the same time, it applies the voltage _{V LD} to the scan electrodes _{S LCD} lambda ₃ of the liquid crystal panel 152 to the voltage _{V LS} and the data electrodes _{D B.} Voltage of the voltage of the scanning electrode _{S LCD} lambda ₂ and the data electrodes _{D G} is zero.

In FIG. 7, the pixel L33 of the liquid crystal panel 152 is turned on. Further, the pixels L11, L13, and L22 remain on. Therefore, light having a wavelength λ ₁ is transmitted through the waveguide 52 of the phosphor R of the image display unit 122, light having a wavelength λ ₂ is transmitted through the waveguide 52 of the phosphor G, and light is transmitted through the waveguide 52 of the phosphor B. Light of wavelengths λ ₁ and λ ₃ propagates. Therefore, the voltage V _FD is applied to the data electrode 12 in the pixels F11, F13, F22, F33, F41, F43, F52, and F63 of the image display unit 122. Since the voltage V _FS is applied to the scan electrodes S _FED 1, S _FED 2, and S _FED 3 of the image display unit 122, electrons are emitted from the pixels F11, F13, F22, and F33, and the phosphor 92 emits light. To do.

As shown in FIG. 8, at time t ₃ , a voltage V _FS is applied to the scan electrode S _FED 4 of the image display unit 122. At the same time, the voltage V _LS is applied to the scan electrode S _LCD λ ₁ of the liquid crystal panel and the voltage V _LD is applied to the data electrodes D _R and D _G. Scanning electrodes _{S FED} 1 voltage of the image display unit 122, the voltage of the voltage of the scanning electrode _{S LCD} lambda ₃ and the data electrode _{D B} of the liquid crystal panel 152 to 0.

In FIG. 7, the pixels L11 and L12 of the liquid crystal panel 152 are turned on. Further, the pixels L22 and L33 remain on. Accordingly, light having a wavelength λ ₁ is transmitted to the waveguide 52 of the phosphor R of the image display unit 122, and light having wavelengths λ ₁ and λ ₂ is transmitted to the waveguide 52 of the phosphor B. light of the wavelength lambda ₃ is propagated. Therefore, the voltage V _FD is applied to the data electrode 12 from the transparent electrode 32 in the pixels F11, F12, F22, F33, F41, F42, F52, and F63 of the image display unit 122. Since the voltage V _FS is applied to the scan electrodes S _FED 2, S _FED 3, and S _FED 4 of the image display unit 122, electrons are emitted from the emitters 82 of the pixels F 22, F 33, F 41, and F 42, and the phosphor 92 Emits light.

As shown in FIG. 8, at time t ₄ , a voltage V _FS is applied to the scan electrode S _FED 5 of the image display unit 122. At the same time, it applies the voltage _{V LD} to the scan electrodes _{S LCD} lambda ₂ of the liquid crystal panel 152 to the voltage _{V LS} and the data electrodes _{D G.} The voltage of scan electrodes _{S FED} 2 of the image display unit 122, the voltage of scan electrodes _{S LCD} lambda ₁ of the voltage and the data electrodes _{D R} of the liquid crystal panel 152 to 0.

In FIG. 7, the pixel L22 of the liquid crystal panel 152 is turned on. Further, the pixels L11, L12, and L33 remain on. Therefore, light having a wavelength λ ₁ is transmitted to the waveguide 52 of the phosphor R, light having wavelengths λ ₁ and λ ₂ is transmitted to the waveguide 52 of the phosphor G, and light having a wavelength λ ₃ is transmitted to the waveguide 52 of the phosphor B. Light propagates. Therefore, the voltage V _FD is applied to the data electrode 12 from the transparent electrode 32 in the pixels F11, F12, F22, F33, F41, F42, F52, and F63 of the image display unit 122. Since the voltage V _FS is applied to the scan electrodes S _FED 3, S _FED 4, and S _FED 5 of the image display unit 122, electrons are emitted from the emitters 82 of the pixels F 33, F 41, F 42, and F 52, and the phosphor 92 Emits light.

  Such driving is sequentially repeated, and the address of the light source unit 162 is performed by line sequential scanning that is performed sequentially for each scanning line, and the image display unit 122 is scanned to display an image by synchronizing with the scanning of the image display unit 122. be able to. Each pixel 127 of the image display unit 122 which is a field emission display emits light for a period of three times the horizontal scanning period. Therefore, the luminance is tripled.

  According to the wavelength multiplexed optical address type display according to the third embodiment, by using the liquid crystal display 152 for the light source unit 162, the simultaneous multiple address of the image display unit 122 can be easily configured while configuring the light source unit 162 in a simple and small size. Can be performed, and address speed can be improved. Further, since the liquid crystal display 152 performs matrix driving, the number of drivers for driving the liquid crystal display can be reduced to the number of m rows + n columns, and cost reduction and space saving can be achieved. That is, in the electro-optic element array and the organic EL display described in the first and second embodiments, nine drivers 155 and 156 are driven, and thus nine drivers are required. When the two-dimensional light emitting array is driven in matrix, the same driving for each pixel 157 can be performed by using a total of six drivers, three in the horizontal direction and three in the vertical direction.

  In addition, since the line sequential scanning by such matrix driving can be performed using an organic EL display, the address of the light source unit 162 is performed by line sequential scanning while using the organic EL display as the light source unit 162. You can also.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the first to third embodiments, the combination of the electro-optic element array 150 and the organic EL display 120, the organic EL display 151 and the plasma display 121, the liquid crystal panel 152 and the field emission display 122 is shown. A digital mirror device, an acousto-optic modulation element (AO element) array, or the like can also be used. Moreover, these combinations can be suitably changed according to a use.

  When a non-self-luminous element such as a liquid crystal display or an electro-optic element array is used as the light source, a backlight is used. As the light source, white light or a combination of LEDs can be used. . The filter can be a color filter or a dichroic filter. When a self-luminous element such as an organic EL display or a plasma display is used, a filter depending on the light emission characteristics can be used. In this embodiment, the light is visible light, but infrared light or ultraviolet light can also be used. In each embodiment, the number of wavelengths to be multiplexed is 3 and the number of scanning lines that can be simultaneously addressed is 3. However, by increasing the number of wavelengths to be multiplexed, the number of scanning lines to be simultaneously addressed can be increased.

  In the present invention, addressing is performed using light of multiple wavelengths in a matrix type display such as an organic EL display, a plasma display, or a field emission display. Since the micro light sources arranged in a matrix are used as the light source, the structure can be simplified without using a branching device and increasing the number of wavelengths to be multiplexed. Further, when a color filter is used, the light source can be composed of only a white light source. Further, since a plurality of scanning lines can be addressed simultaneously, scanning can be easily performed even in a high-definition display having a large number of scanning lines. Further, since the scanning period can be extended, luminance can be improved. The present invention is particularly effective for an ultra-high-definition display or a three-dimensional display having a large number of scanning lines.

  The present invention can be used for various matrix type displays that perform addressing when displaying an image, such as an organic EL display, a plasma display, a liquid crystal display, and a field emission display.

10, 11, 12 Data electrode 20, 21, 22 Photoconductive film 30, 31, 32, 100, 102 Transparent electrode 40, 41, 42, 140, 142 Color filter 50, 51, 52 Waveguide 60, 61, 62, 110, 111, 112 Substrate 70, 71, 73 Scan electrode 72 Sustain electrode 80, 82 Emitter 90 Organic semiconductor layer 91 Discharge cell 92 Phosphor 120, 121, 122 Image display unit 130, 132 Backlight 150 Electro-optic element array 151 Organic EL display 152 Liquid crystal panel 160, 161, 162 Light source 170, 171, 172 Coupler

Claims (8)

A data electrode divided for each subpixel, a photoconductive film provided under the data electrode, a transparent electrode provided under the photoconductive film, and a first layer on the transparent electrode under the transparent electrode A plurality of types of wavelength filters provided in parallel with each of a plurality of wavelengths of light, and a plurality of waveguides provided in parallel in a second direction orthogonal to the first direction; When light having a wavelength that passes through the wavelength filter enters the waveguide and the resistance value of the photoconductive film is reduced, a voltage applied to the transparent electrode is applied to the data electrode to perform addressing. An image display unit;
A two-dimensional array in which light-emitting elements that emit any one of the plurality of wavelengths of light are two-dimensionally arranged, and a light source unit that enters the light emitted from the two-dimensional array into the waveguide. A wavelength-division multiplexed optical address type display.   In the two-dimensional array, the light emitting elements that emit light of the same wavelength are arranged in rows extending in the first direction corresponding to the arrangement of the plurality of types of wavelength filters, 2. The wavelength division multiplexing optical address display according to claim 1, wherein the rows formed by the light emitting elements are arranged in parallel to the first direction.   The said two-dimensional array has one light emitting element which light-emits the light of these several wavelength in each row | line extended in the direction orthogonal to the said 1st direction, The Claim 2 characterized by the above-mentioned. Wavelength multiplexed optical address type display. The image display unit includes scan electrodes provided in parallel with the first direction corresponding to the sub-pixels,
The light source unit addresses the light emitting elements of the two-dimensional array in synchronization with scanning performed by applying a predetermined voltage to the scan electrodes, and simultaneously inputs the light of the plurality of wavelengths into the waveguide. The wavelength division multiplexing optical address type display according to any one of claims 1 to 3.   5. The wavelength division multiplexing optical address type display according to claim 4, wherein the address of the light emitting element of the light source unit is performed by frame sequential scanning.   5. The wavelength division multiplexing optical display according to claim 4, wherein the address of the light emitting element of the light source unit is performed by line sequential scanning.   The wavelength multiplexed optical display according to claim 6, wherein the light source unit is a liquid crystal display or an organic EL display.   The wavelength division multiplexing optical display according to any one of claims 1 to 7, wherein a coupler is provided between the light source unit and the waveguide.

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