JP3310487B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device using a single-panel color liquid crystal panel that generates RGB color light with one liquid crystal panel, and more particularly to a liquid crystal display device using a reflective single-panel color liquid crystal panel.

[0003]

[0002]

[0004]

2. Description of the Related Art FIG.
In the figure, a color filter 32 composed of a red (R) filter 32R, a green (G) filter 32G, and a blue (B) filter 32B is formed on a glass substrate 31 in a mosaic or stripe shape. I have. A silicon dioxide protective film 33 is formed on the color filter 32, and a transparent electrode 34 serving as a liquid crystal drive electrode is formed on the silicon dioxide protective film 33. An element layer 36 in which elements such as switching elements and non-linear elements are arranged as a counter electrode facing the transparent electrode 34 is formed on a glass substrate 35, and a transparent drive corresponding to each RGB pixel of the color filter 32 is formed thereon. An electrode layer 37 is formed. A liquid crystal 38 is sealed in a gap between the two glass substrates 31 and 35.

[0005]

In the above arrangement, a polarizing plate (not shown) is provided on the outer surface of each of the glass substrates 31 and 35, and white light is emitted from the glass substrate 31 side, and the RGB filters 32R, 32G, By driving the drive electrode 37 corresponding to 32B, the liquid crystal 38 controls the polarization state of light having a wavelength corresponding to a predetermined color, and transmits or semi-transmits. As a result, light of the wavelength of the corresponding color filter 32 is transmitted or semi-transmitted, and color display is performed.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a reflective liquid crystal display comprising a liquid crystal and reflective electrodes corresponding to respective pixels of RGB sequentially arranged on the back of the liquid crystal. a color liquid crystal panel, R in front of the liquid crystal panel
A three primary color light irradiating means for sequentially irradiating each of the three primary color lights in a predetermined cycle, and three primary color lights from the three primary color light irradiating means are sequentially illuminated only to the corresponding RGB reflective electrodes of the reflective electrodes. And control means for controlling.

Japanese Patent Laid-Open Publication No. Sho 56-72486 discloses a configuration of a reflection type single-panel color liquid crystal panel.
Magenta, yellow, and cyan color elements are applied to the drive electrodes 37 instead of the color filters 32, respectively.

Also, a reflective color liquid crystal panel comprising a liquid crystal and reflective electrodes corresponding to each pixel of RGB sequentially disposed on the back of the liquid crystal, and sequentially generates three primary color lights of RGB at a predetermined cycle. Primary color light irradiating means, and a polarizing beam splitter for irradiating the front surface of the liquid crystal panel with S-wave or P-wave components of the three primary color lights generated by the three primary color light irradiating means;
Control means for controlling the three primary color lights passing through the polarizing beam splitter so as to sequentially irradiate only the corresponding RGB reflection electrodes of the reflection electrodes; and a P wave or an S wave reflected from the reflection type color liquid crystal panel. A component is provided with a projection lens for enlarging the component by passing through the polarizing beam splitter and enlarging the component, and a screen for displaying an image from the projection lens.

[0008]

The three primary color light irradiating means sequentially irradiates each of the three primary color lights of RGB at a predetermined period on the front surface of the reflection type color liquid crystal panel. At this time, the control means controls the three primary color lights so as to sequentially irradiate only the corresponding RGB reflective electrodes of the reflective electrodes in the reflective color liquid crystal panel, and the RGB three primary color lights reflected by the reflective electrodes are optically reflected. Are synthesized and displayed.

[0005]

The three primary color lights generated by the three primary color light irradiating means pass through a polarizing beam splitter and their S-wave or P-wave components are sequentially irradiated on the front surface of the liquid crystal at a predetermined cycle. At this time, the three primary colors of light are controlled by the control means so that the corresponding R
Control is performed so that only the GB reflective electrodes are sequentially irradiated, and the P-wave or S-wave components reflected from the reflective color liquid crystal panel pass through the polarizing beam splitter and enter the projection lens. The projection lens magnifies this and projects and displays the image on the screen.

Therefore, it is not possible to improve the brightness when displaying a predetermined image.

In addition, since the ratio of the area where the RGB light is incident to the entire area of the color liquid crystal panel cannot be increased, the light use efficiency cannot be improved, and sufficient display luminance cannot be obtained.

In addition, in the reflection type, in addition to the above-mentioned problems, it is necessary to apply RGB color elements to each electrode, which requires a high degree of molding accuracy and forms many pixels in a liquid crystal panel. Can not.

An object of the present invention is to provide a high-brightness liquid crystal display device without using a special liquid crystal panel and improving the light use efficiency.

[0014]

[0006]

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a reflective liquid crystal display comprising a liquid crystal and reflective electrodes corresponding to respective pixels of RGB sequentially arranged on the back of the liquid crystal. A color liquid crystal panel, a three primary color light irradiating means for sequentially irradiating each of the three primary color lights of RGB at a predetermined period on the front surface of the liquid crystal; And control means for controlling the irradiation of the reflection electrode sequentially.

[0016]

Also, a reflective color liquid crystal panel comprising a liquid crystal and reflective electrodes corresponding to each pixel of RGB sequentially disposed on the back of the liquid crystal, and sequentially generates three primary color lights of RGB at a predetermined cycle. Primary color light irradiating means, a polarizing beam splitter for irradiating the front surface of the liquid crystal with an S wave or P wave component of the three primary color lights generated by the three primary color light irradiating means, and three primary color lights passing through the polarizing beam splitter are Control means for controlling the reflection of the corresponding RGB reflection electrodes so as to be sequentially applied to the reflection electrodes; and a P-wave or S-wave component reflected from the reflection type color liquid crystal panel passes through the polarization beam splitter and is incident. And a screen for displaying an image from the projection lens.

[0017]

[0008]

[0018]

The three primary color light irradiating means sequentially irradiates each of the three primary color lights of RGB at a predetermined period on the front surface of the reflection type color liquid crystal panel. At this time, the control means controls the three primary color lights so as to sequentially irradiate the corresponding RGB reflective electrodes of the reflective electrodes in the reflective color liquid crystal panel, and the RGB three primary color lights reflected by the reflective electrodes are optically controlled. And are displayed.

[0019]

The three primary color lights generated by the three primary color light irradiating means pass through a polarizing beam splitter and their S-wave or P-wave components are sequentially irradiated on the front surface of the liquid crystal at a predetermined cycle. At this time, the three primary colors of light are controlled by the control means so that the corresponding R
Control is performed so as to sequentially irradiate the GB reflective electrodes, and the P-wave or S-wave components reflected from the reflective color liquid crystal panel pass through the polarizing beam splitter and enter the projection lens. The projection lens magnifies this and projects and displays the image on the screen.

[0020]

[0010]

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a top view of an embodiment of a projection type liquid crystal display device according to the present invention, wherein 1 is a reflective color liquid crystal panel, and 2 is a lenticular disposed on the front surface of the reflective color liquid crystal panel 1. The lens 3 has a polarization beam splitter disposed in front of the lenticular lens 2, and the color 4 has a color disposed at a position facing the polarization beam splitter 3 and orthogonal to the reflective color liquid crystal panel 1 and the lenticular lens 2 in the horizontal direction. A filter disk,
It has RGB light transmissive filters whose area ratio is equally divided into three parts in a disk shape. Reference numeral 5 denotes a motor for rotating the color filter disk 4 at a predetermined cycle, reference numeral 6 denotes a light source such as a xenon lamp or a metal halide lamp which emits white light and is disposed on the surface of the color filter disk 4 opposite to the polarization beam splitter 3; Reference numeral 8 denotes a reflector for converting the light generated from the light source 6 into parallel light and irradiating the light to the color filter disk 4. Reference numeral 8 denotes the light reflected by the reflection type color liquid crystal panel 1 obtained through the polarizing beam splitter 3 and projected. 9 is a screen for projecting and displaying the light emitted from the projection lens 8, 10 is a motor drive circuit for driving the motor 5, 11 is a lenticular lens 2 for coloring the lenticular lens 2 in the horizontal direction. A piezoelectric element 12 for reciprocating in synchronization with the rotation of the filter disk 4;
, A control circuit 13 for controlling the drive of the motor drive circuit 10 and the piezoelectric element drive circuit 11, and an image 14 to which an image source is input and which supplies a drive signal to the reflective color liquid crystal panel 1. It is a signal processing circuit.

[0023]

FIGS. 2 (a) and 2 (b) show an example of the configuration of a color filter disk 4, which is a light-transmitting red (R) filter 4R, green (G) filter 4G and blue (B) divided into a disk shape. ) The filter 4B is configured to be rotated clockwise by a motor 5 in the figure. The area ratio of each color filter 4R, 4G, 4B is equally divided into three. It should be noted that the center of the color filter disk 4 is offset from the polarizing beam splitter 3, and when the color filter disk 4 rotates, each filter 4
Lights transmitted through R, 4G, and 4B are installed at positions where they are sequentially incident on the polarization beam splitter 3.

[0024]

FIG. 3 shows the structure of the reflection type color liquid crystal panel 1, in which the color filter 32 is omitted as compared with the pass-through single-panel color liquid crystal panel 30 shown in FIG. A mold drive electrode layer 20 is formed.

That is, 15 is a glass substrate, 16 is a silicon dioxide protective film formed on the glass substrate 15, 17 is a transparent electrode formed on the silicon dioxide protective film 16, 18 is a glass substrate, and 19 is a glass substrate 18 An element layer 20 formed thereon is a reflective drive electrode layer corresponding to each pixel of RGB, and includes a reflective drive electrode 20R for R and a reflective drive electrode 20 for G.
The reflection drive electrodes 20B for G and B are sequentially arranged in the horizontal direction, and the respective drive electrode rows are two-dimensionally arranged. Each of the reflection drive electrodes 20R, 20G, and 20B is not formed by applying a color element to the surface of an electrode layer as in the reflection type color liquid crystal panel in the above-described conventional example, but is formed by a member having light reflectivity, for example. , With a reflective film formed on the surface, and are electrode layers having the same configuration. Reference numeral 21 denotes a liquid crystal sealed in a gap between the glass substrates 15 and 18.

[0026]

In the above configuration, the control circuit 13 controls the motor drive circuit 10 and the piezoelectric element drive circuit 12 so that the drive circuits 10 and 12 respectively drive the motor 5 and the piezoelectric element 11 in synchronization. When the motor 5 rotates, the color filter disk 4 rotates, and the RGB filters 4R, 4G, and 4B rotate.

The white light generated by the light source 6 is reflected by the reflector 7
The light is reflected by the light and becomes parallel light, and is irradiated on the color filter disk 4. The color filter disk 4 is rotated by a motor 5, and each of the RGB filters 4 R, 4 G, and 4 B sequentially receives the white light, so that each color light is sequentially incident on the polarization beam splitter 3.

The polarization beam splitter 3 receives the RG
The S-wave or P-wave component of the B light is reflected, and is irradiated on the lenticular lens 2 and the reflective color liquid crystal panel 1.

The lenticular lens 2 is mounted so as to be reciprocally movable in the horizontal direction by the piezoelectric element 11. The lenticular lens 2 is synchronized with the rotation of the motor 5 by the piezoelectric element 11, the piezoelectric element driving circuit 12 and the control circuit 13. Reciprocates.

The operation will be described below with reference to FIGS.

[0031]

FIG. 4A shows a state in which the red filter 4R of the color filter disk 4 is located at a position facing the light source 6, and R light is incident on the lenticular lens 2 from the red filter 4R through the polarizing beam splitter 3. ing.

At this time, the lenticular lens 2 drives the piezoelectric element 11 such that the R light transmitted through the lenticular lens 2 is at a position where it enters the R reflection drive electrode 20R of the reflection type color liquid crystal panel 1 as shown in the figure. Is set.

That is, the R light is lenticular lens 2
Is refracted by the lenticular lens 2 and is incident on the R reflection drive electrode 20R through the glass substrate 15, the silicon dioxide protective film 16, the transparent electrode 17 and the liquid crystal 21 of the reflection type color liquid crystal panel 1. And the electrode 20
The reflected light reflected by R is reflected by the liquid crystal 21, the transparent electrode 17,
The light reaches the lenticular lens 2 through the silicon dioxide protective film 16 and the glass substrate 15, is refracted by the lenticular lens 2, and is emitted toward the polarization beam splitter 3.

[0034]

Next, when the green filter 4G of the color filter disk 4 comes to a position facing the light source 6, the lenticular lens 2 reciprocates in the horizontal direction by driving the piezoelectric element 11 as shown in FIG. The G light transmitted through the lens 2 is set at a position where the G light is incident on the G reflection drive electrode 20G of the reflection type color liquid crystal panel 1.

Thereafter, similarly to the above-described operation, the G light is incident on and reflected by the G reflection drive electrode 20G, passes through the lenticular lens 2, and is emitted to the polarization beam splitter 3 side.

When the blue filter 4B comes to a position facing the light source 6, the B light transmitted through the lenticular lens 2 by the driving of the piezoelectric element 11, as shown in FIG. It moves to the position where it is incident on the reflective driving electrode 20B for use.

Thereafter, the B light reflected by the B reflection drive electrode 20B is emitted in the same manner as the above operation.

[0038]

The rotation of the color filter disk 4 and the reciprocating movement of the lenticular lens 2 in the horizontal direction are synchronized with each other.
If it is an SC television color signal, 4
7.25 KHz (= horizontal frequency 15.75 KHz x 3)
It rotates and reciprocates in the above cycle.

The RGB light emitted from the lenticular lens 2 enters the polarizing beam splitter 3,
At this time, since the RGB light is a P-wave or an S-wave, the RGB light is transmitted through the polarization beam splitter 3 and is incident on the projection lens 8. Project the video source and display it.

[0040]

The video source to be displayed is input to the video signal processing circuit 14, where the video source is separated into RGB signal components and supplied to the reflection driving electrodes 20R, 20G, 20B of the reflection type color liquid crystal panel 1. I do. The transmission state of the liquid crystal of the reflection type color liquid crystal panel 1 is controlled in accordance with the voltage applied to the reflection drive electrode 20, and for example, when the video source is a television color signal, the transmission state is controlled in accordance with the RGB signal components. Receiving light intensity modulation,
The reflective color liquid crystal panel 1 emits RGB light corresponding to the RGB signal components of the television color signal.

[0041]

When a television color signal is used as a video source, the horizontal synchronizing signal is separated from the video signal processing circuit 14 and supplied to the control circuit 13 so that the motor driving circuit 10 and the piezoelectric element driving circuit 12 Are controlled in synchronization with the horizontal synchronization signal, and the motor 5 and the piezoelectric element 11 are controlled.
May rotate and reciprocate in synchronization with the horizontal synchronization signal.

Further, in the above-described embodiment, the configuration example applied to the projection type display device is shown, but it is needless to say that the configuration can be applied to the direct-view type display device.

[0043]

[0019]

[0044]

As described above, according to the present invention, a high-brightness light is made incident without using a special liquid crystal panel and since the liquid crystal panel has no member such as a color filter that absorbs light and generates heat. And high-luminance display becomes possible.

Further, since the ratio of the area on which the RGB light is incident to the entire area of the reflection type color liquid crystal panel can be increased (for example, 90% or more), the light use efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a diagram showing a configuration of a color filter disk in FIG.

FIG. 3 is a diagram showing a configuration of a reflective color liquid crystal panel in FIG. 1;

FIG. 4 is a diagram for explaining the operation in FIG. 1;

FIG. 5 is a diagram showing a configuration of a conventional color liquid crystal panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reflective color liquid crystal panel 2 Lenticular lens 3 Polarization beam splitter 4 Color filter disk 4R Red filter 4G Green filter 4B Blue filter 5 Motor 6 Light source 7 Reflector 8 Projection lens 9 Screen 10 Motor drive circuit 11 Piezoelectric element 12 Piezoelectric element drive circuit 13 Control circuit 14 Video signal processing circuit 15 Glass substrate 16 Silicon dioxide protective film 17 Transparent electrode 18 Glass substrate 19 Element layer 20 Reflection drive electrode layer 20R Reflection drive electrode for R 20G Reflection drive electrode for G 20B Reflection drive electrode for B 21 Liquid crystal 30 Color LCD panel 38 LCD

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/13 505 G02F 1/133

Claims (6)

(57) [Claims] 1. A reflection type color liquid crystal panel comprising a liquid crystal and reflection electrodes corresponding to respective pixels of RGB sequentially arranged on a back surface of the liquid crystal, and three primary color lights of RGB are provided on a front surface of the liquid crystal panel. A three-primary-color light irradiating means for sequentially irradiating the light in a cycle; and a control means for controlling the three-primary-color light from the three-primary-light light irradiating means so as to sequentially irradiate only the corresponding RGB reflection electrode of the reflection electrode. A liquid crystal display device characterized by the above-mentioned. 2. The device according to claim 1, wherein the three primary color light irradiating means includes: a light source that emits white light; and a color filter disk having RGB light-transmitting filters whose area ratio is equally divided into three in a disk shape. And a motor for rotating the color filter disk. 3. The lenticular lens according to claim 1, wherein the control means comprises: a lenticular lens disposed on a front surface of the reflection type color liquid crystal panel, and through which each of the three primary color lights of RGB emitted from the three primary color light irradiating means passes. Moving means for reciprocatingly moving the lenticular lens in synchronization with the predetermined period so that each of the three primary color lights of RGB emitted from the three primary color light irradiation means is sequentially emitted only to the corresponding RGB reflection electrodes. A liquid crystal display device characterized by the above-mentioned. 4. A reflective color liquid crystal panel comprising a liquid crystal and reflective electrodes corresponding to each pixel of RGB sequentially disposed on the back of the liquid crystal; and sequentially generating three primary color lights of RGB at a predetermined period. Primary color light irradiating means, a polarized beam splitter for irradiating the front surface of the liquid crystal panel with an S wave or P wave component of the three primary color lights generated by the three primary color light irradiating means, and three primary color lights passing through the polarized beam splitter. Control means for controlling so as to sequentially irradiate only the corresponding RGB reflection electrode of the reflection electrode; and a P-wave or S-wave component reflected from the reflection type color liquid crystal panel passes through the polarization beam splitter and enters. A liquid crystal display device comprising: a projection lens for enlarging the projection lens; and a screen for displaying an image from the projection lens. 5. The three-primary-color light irradiating means according to claim 4, further comprising: a light source that emits white light; and a color filter disk having RGB light-transmitting filters whose area ratio is equally divided into three in a disk shape. And a motor for rotating the color filter disk. 6. The lenticular lens according to claim 4, wherein the control means comprises: a lenticular lens disposed on a front surface of the reflection type color liquid crystal panel and passing each of three primary color lights of RGB emitted from the three primary color light irradiating means; Moving means for reciprocatingly moving the lenticular lens in synchronization with the predetermined period so that each of the three primary color lights of RGB emitted from the three primary color light irradiation means is sequentially emitted only to the corresponding RGB reflection electrodes. A liquid crystal display device characterized by the above-mentioned.