JP5029064B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device that displays a high-definition image.

A liquid crystal display device is a liquid crystal display in which a plurality of pixels that control light transmission are arranged in a row direction and a column direction, image data is written in these pixels, and an image corresponding to the image data is displayed. An element, a surface light source that is disposed on the opposite side of the liquid crystal display element from the viewing side and that irradiates illumination light toward the liquid crystal display element, and a drive that sequentially writes image data to pixels in each row of the liquid crystal display element It is comprised by the means (refer patent document 1).
Japanese Patent Laid-Open No. 5-313604

  The liquid crystal display device is desired to increase the number of pixels of the liquid crystal display element in order to display a high-definition image.

  However, in order to increase the number of pixels of the liquid crystal display element, it is necessary to form a plurality of pixels in a large number of rows with a dense pitch, and as the number of pixel rows increases, the liquid crystal display element is increased. This increases the cost because it must be driven by a driver element having a large number of terminals.

  An object of this invention is to provide the liquid crystal display device which can implement | achieve the display of a high definition image.

The liquid crystal display device according to claim 1 of the present invention is
A plurality of pixels that control light transmission form a pixel row in which a plurality of pixels are arranged in a row direction that is a horizontal direction of the screen , and this pixel row has a pixel width in a direction orthogonal to the row direction between the pixel rows. A plurality of substantially the same intervals are formed, a light shielding film corresponding to a region between the plurality of pixel rows is provided, and an operating voltage corresponding to image data is applied to each pixel of the plurality of pixel rows. A liquid crystal display element that displays an image according to the image data; a screen that is disposed on the observation side of the liquid crystal display element and on which the display image of the liquid crystal display element is projected;
Each image of the pixel row on the screen is disposed on the side opposite to the viewing side of the liquid crystal display element and includes light substantially parallel to a predetermined first direction toward the liquid crystal display element. Is substantially parallel to a first direction that projects at a distance corresponding to one pixel row and a second direction that differs from the first direction by an angle corresponding to the one pixel row. It comprises a light and a second illumination light to project each image of the pixel rows in the distance on the screen corresponding to one pixel row in each image projected on the first the screen by illuminating light A surface light source for selectively illuminating,
The image data is divided into odd-numbered image data and even-numbered image data for each screen data, and these odd-numbered row image data and even-numbered row image data are alternately arranged in each of the plurality of pixel rows of the liquid crystal display element. writing to the pixel, in Rukoto to irradiate the odd rows in synchronism with the writing of the image data from said surface light source first illumination light to project the odd rows image corresponding to the odd-numbered row image data, the even rows Driving means for projecting an even row image corresponding to the even row image data by irradiating the second illumination light from the surface light source in synchronization with writing of image data ;
Equipped with a,
When the first illumination light and the second illumination light are selectively emitted from the surface light source, the light shielding film is provided between the plurality of pixel rows, whereby the screen is provided. The odd-numbered row image and the even-numbered row image of each row projected on the screen are set so as not to overlap each other.

  According to a second aspect of the present invention, in the liquid crystal display device according to the first aspect, the surface light source includes a first illumination light composed of light substantially parallel to the first direction, and the second light source. The second illumination light consisting of light substantially parallel to the direction is selected.

  According to a third aspect of the present invention, in the liquid crystal display device according to the first or second aspect, the liquid crystal display element includes a light shielding film corresponding to a region between the plurality of pixel rows. And

  According to the liquid crystal display device of the present invention, display of a high definition image can be realized.

  1 to 10 show an embodiment of the present invention. FIG. 1 is an exploded perspective view of a liquid crystal display device, and FIG. 2 is a side view of the liquid crystal display device.

  As shown in FIGS. 1 and 2, the liquid crystal display device includes a liquid crystal display element 1, a screen 16 that is disposed on the observation side of the liquid crystal display element 1 and onto which a display image of the liquid crystal display element 1 is projected, A surface light source 17 that is disposed on the opposite side of the liquid crystal display element 1 from the observation side and that irradiates illumination light toward the liquid crystal display element 1; and a driving means 25 that drives the liquid crystal display element 1 and the surface light source 17; It has.

  The liquid crystal display element 1 forms a pixel row 14 in which a plurality of pixels 13 for controlling light transmission are arranged in the row direction, and the pixel row 14 is in a direction orthogonal to the row direction between the pixel rows. A plurality of rectangular screen areas 12 are formed at substantially the same interval as the pixel width of each pixel, and an image is displayed on each pixel 13 of a plurality of pixel rows 14 including a plurality of pixels 13 arranged in the row direction. An operating voltage corresponding to the data is applied, and an image corresponding to the image data is displayed.

  3 is an enlarged cross-sectional view of a portion along the vertical direction of the screen of the liquid crystal display element 1, and FIG. 4 is an enlarged cross-sectional view of a portion along the horizontal direction of the screen of the liquid crystal display element 1.

  The liquid crystal display element 1 is an active matrix liquid crystal display element having TFTs (thin film transistors) as active elements, and a pair of transparent substrates joined via a frame-shaped sealing material (not shown) surrounding the screen area 12. A liquid crystal layer 9 is sealed in a region surrounded by the sealing material between 2 and 3, and one of the inner surfaces of the pair of transparent substrates 2 and 3 facing each other, for example, a substrate opposite to the observation side A plurality of transparent pixel electrodes 4 arranged in a row direction (left and right direction of the screen) and a column direction (up and down direction of the screen) on the inner surface of 3 (hereinafter referred to as a rear substrate), and respectively correspond to these pixel electrodes 4 A plurality of TFTs 5 are provided, and a single film-like transparent counter electrode 6 facing the plurality of pixel electrodes 4 is provided on the inner surface of the other substrate, for example, a substrate on the observation side (hereinafter referred to as a front substrate) 2. The pair Respectively on the outer surface polarizing plates 10 and 11 of the substrate 2 and 3 are disposed.

  The plurality of pixel electrodes 4 are made of a transparent conductive film formed in a vertically long rectangular shape whose electrode width in the row direction is about 1/3 of the electrode width in the column direction, and is closely spaced in the row direction. The electrodes are arranged in the column direction with substantially the same spacing as the electrode width in the column direction.

  The plurality of TFTs 5 are arranged in a region between the plurality of pixel electrodes 4 and 4 arranged in the column direction, that is, a region corresponding to the plurality of pixel rows 14 and 14.

  3 and 4, the TFT 5 is simplified. The TFT 5 includes a gate electrode formed on the plate surface of the rear substrate 3 and a plurality of pixel electrodes 4 covering the gate electrode. A transparent gate insulating film formed on the entire array region; an i-type semiconductor film formed on the gate insulating film so as to face the gate electrode; and an n-type on both sides of the i-type semiconductor film It consists of a drain electrode (input electrode) and a source electrode (output electrode) formed via a semiconductor film.

  Although omitted in FIGS. 3 and 4, a plurality of scanning lines for supplying gate signals to the TFTs 5 in each row and data signals to the TFTs 5 in each column are provided on the inner surface of the rear substrate 3. A plurality of signal lines for supply are provided.

  The plurality of scanning lines are formed in regions corresponding to the plurality of pixel rows 14 and 14 on the plate surface of the rear substrate 3 along one side of the plurality of pixel electrodes 4 of each row, The plurality of signal lines are connected to one side of the plurality of pixel electrodes 4 in each column on the gate insulating film, respectively, connected to the gate electrodes of the TFTs 5 corresponding to the plurality of pixels 13 in each row. And connected to the drain electrodes of the TFTs 5 corresponding to the plurality of pixel electrodes 4 in each column.

  The plurality of pixel electrodes 4 are formed on the gate insulating film and connected to the source electrodes of the TFTs 5 corresponding to the pixel electrodes 4, respectively.

  On the other hand, on the inner surface of the front substrate 2, a plurality of pixels 13 composed of regions where the plurality of pixel electrodes 4 provided on the rear substrate 3 and the counter electrode provided on the front substrate 2 face each other, A light shielding film 7 corresponding to a region between the pixels 13, that is, a region between the plurality of pixel rows 14 and 14 and a region between the plurality of pixels 13 and 13 in each pixel row 14 is provided.

  Further, on the inner surface of the front substrate 2, there are provided three color filters 8R, 8G, and 8B of red, green, and blue corresponding to the plurality of pixels 13, respectively. A counter electrode 6 is formed.

  Further, as shown in FIGS. 1 and 2, the rear substrate 3 has a driver mounting portion 3 a that protrudes outward from the front substrate 2 at one side edge thereof, for example, one edge side in the column direction. The driver mounting section 3a is mounted with a driver element 15 that sequentially applies gate signals to the plurality of scanning lines and applies data signals to the plurality of signal lines.

  The plurality of scanning lines and the plurality of signal lines are led out to the driver mounting portion 3a and connected to the gate signal output terminal and the data signal output terminal of the driver element 15, respectively. It is connected to the counter electrode terminal of the driver element 15 through a cross connection portion (not shown) provided at the substrate bonding portion made of a material.

  Further, an alignment film (not shown) is provided on the inner surfaces of the pair of substrates 2 and 3 so as to cover the electrodes 4 and 6, respectively, and a liquid crystal layer sealed between the pair of substrates 2 and 3. The liquid crystal molecules 9 are aligned in a predetermined alignment state defined by the alignment film.

  The liquid crystal display element 1 includes a TN or STN type in which the liquid crystal molecules of the liquid crystal layer 9 are twisted, a vertical alignment type in which the liquid crystal molecules are aligned substantially perpendicular to the surfaces of the substrates 2 and 3, and liquid crystal molecules. Either a horizontal alignment type that is aligned substantially parallel to the surfaces of the substrates 2 and 3 without twisting, a bend alignment type that bends liquid crystal molecules, or a ferroelectric or antiferroelectric liquid crystal display device. In addition, the polarizing plates 10 and 11 on the outer surfaces of the pair of substrates 2 and 3 are arranged with their transmission axes oriented so as to obtain good contrast.

  In the liquid crystal display element 1 of this embodiment, electrodes 4 and 6 for forming a plurality of pixels 13 are provided on the inner surfaces of the pair of substrates 2 and 3, respectively, and an electric field is generated between the electrodes 4 and 6. The liquid crystal display element is provided with, for example, comb-like first and second electrodes that form a plurality of pixels on the inner surface of one of a pair of substrates. A lateral electric field control type of changing the alignment state of liquid crystal molecules by generating a horizontal electric field (electric field in a direction along the substrate surface) between the electrodes may be used.

  The screen 16 is a transmissive screen that allows an image projected from one surface side to be observed from the other surface side, and one surface of the screen 16 is an observation-side surface of the liquid crystal display element 1 (observation-side polarizing plate). 10 is arranged at a position at a predetermined distance from the observation side surface of the liquid crystal display element 1.

  The surface light source 17 is made of a rectangular sheet-like transparent member corresponding to the screen area 12 of the liquid crystal display element 1, and one surface thereof is parallel to the upper and lower sides of the screen area 12 of the liquid crystal display element 1. An incident surface 19 formed by closely arranging a plurality of elongated prism portions 20 along a certain direction is formed, and a flat surface-shaped emission surface 21 for emitting light incident from the incident surface 19 is formed on the other surface. The formed prism sheet 18, the flat reflecting plate 22 disposed opposite to the incident surface 19 of the prism sheet 18 with a predetermined gap, and the length of the prism portion 20 of the prism sheet 18. First and second light emitting elements disposed on two end sides in the direction orthogonal to the vertical direction, that is, on the lower end side and the upper end side, respectively, facing the gap between the prism sheet 18 and the reflecting plate 22. element 3a, is constituted by a 23b, the the observation side of the liquid crystal display device 1 on the opposite side and the exit surface 21 of the prism sheet 18 is disposed opposite to the liquid crystal display device 1.

  In FIG. 1 and FIG. 2, the plurality of prism portions 20 of the prism sheet 18 are greatly exaggerated. However, these prism portions 20 have the electrode width in the row direction of each pixel 13 of the liquid crystal display element 1. It is formed to have the same or smaller width.

  The first and second light-emitting elements 23a and 23b are solid-state light-emitting elements made of LEDs (light-emitting diodes), for example, and the longitudinal directions of the respective edge portions on the lower end side and the upper end side of the prism sheet 18. A plurality are arranged side by side.

  The surface light source 17 has a light intensity peak in a predetermined first direction toward the liquid crystal display element 1 by selectively lighting the first light emitting element 23a and the second light emitting element 23b. The first illumination light 24a having directivity and the directivity having a light intensity peak in a second direction inclined at a predetermined angle in a direction orthogonal to the row direction with respect to the first direction. The second illumination light 24b having the above is selectively irradiated.

  That is, the surface light source 17 emits the light emitted from the first light emitting element 23a disposed on the lower end side of the prism sheet 18 and incident on the gap between the prism sheet 18 and the reflecting plate 22 as shown in FIG. As indicated by the arrows in FIG. 6, the light reflected by the reflecting plate 22 is directed toward the prism sheet 18 toward the lower end side of the prism sheet 18 among the inclined surfaces on both sides of the prism portions 20 of the incident surface 19. The first illumination light 24a that is incident from the inclined surface and is deflected in the direction in which the angle with respect to the normal direction of the prism sheet 18 (the direction perpendicular to the emission surface 21 of the prism sheet 18) is reduced becomes the prism sheet 18 Is emitted toward the liquid crystal display element 1 and emitted from the second light emitting element 23b disposed on the upper end side of the prism sheet 18, and the prism sheet 1 As shown by a broken line in FIG. 2, the light incident on the gap between the reflecting plate 22 and the reflecting plate 22 is reflected by the reflecting plate 22 and reflected on the prism sheet 18 to the other of the plurality of prism portions 20. The second illumination light 24b incident from an inclined surface, that is, an inclined surface facing the upper end side of the prism sheet 18 and deflected in a direction in which an angle with respect to the normal direction of the prism sheet 18 is reduced is the prism sheet 18. Irradiation toward the liquid crystal display element 1 from the light emission surface 21.

  FIG. 5 is a diagram showing the light emitted from the surface light source 17 from the first and second illumination lights 24a and 24b. In the figure, the plurality of pixel electrodes 4, the counter electrode 6 and the color filter 8R of the liquid crystal display element 1 are shown. 8G and 8B and polarizing plates 10 and 11 are omitted.

  As shown in FIG. 5, the first illumination light 24 a emitted from the emission surface 21 of the prism sheet 18 toward the liquid crystal display element 1 when the first light emitting element 23 a is turned on is a plurality of the prism sheets 18. The surface of the prism portion 20 is parallel to the length direction and includes a normal line H of the prism sheet 18, and the surface of the liquid crystal display element 1 is inclined in advance at a predetermined angle. Light having directivity having a peak of light intensity in the defined first direction A1, and when the second light emitting element 23b is turned on, the light emitting surface 21 of the prism sheet 18 is directed toward the liquid crystal display element 1. The second illumination light 24b to be irradiated is parallel to the first direction A1 and parallel to the length direction of the prism portion 20, and to the surface including the normal H of the prism sheet 18. Of display element 1 A light having a directivity in the second direction A2 along the direction of the surface inclined at a predetermined angle in a direction having a peak of light intensity.

  The second direction (the peak direction of the light intensity of the second illumination light 24b) A2 is the pixel of each of the two adjacent pixel rows 14 and 14 of the liquid crystal display element 1 in the first illumination light. The center of the region D2 between the projection regions D1 and D1 on the screen 16 of the two transmitted light beams respectively, and the one of the two pixel rows 14 and 14 (the upper pixel row in this embodiment). This is a direction parallel to the direction passing through the center of the pixel width in the direction orthogonal to the row direction.

  That is, the surface light source 17 has a directivity having a light intensity peak in a predetermined first direction A1, and each image of the pixel row 14 on the screen 16 corresponds to one pixel row 14. And directivity having a peak of light intensity in the second direction A2 which differs from the first illumination light 24a projected by the angle corresponding to the one pixel row 14 with respect to the first direction A1. The second illumination for projecting each image of the pixel row 14 to the interval on the screen 16 corresponding to one pixel row 14 of each image projected on the screen 16 by the first illumination light 24a. The light 24 b is selectively irradiated toward the liquid crystal display element 1.

  The first direction A1, that is, the intensity peak direction of the first illumination light 24a, is a predetermined angle with respect to the normal H of the prism sheet 18 in the upper side direction of the screen of the liquid crystal display element 1. the second direction A2, that is, the intensity peak direction of the second illumination light 24b, is the lower side of the screen of the liquid crystal display element 1 with respect to the normal H of the prism sheet 18. This is a direction tilted at a predetermined angle θ2.

  In this embodiment, the cross-sectional shapes of the plurality of prism portions 20 of the prism sheet 18 are respectively set to one inclined surface facing the upper end side of the prism sheet 18 and the other facing the lower end side of the prism sheet 18. Are formed in an isosceles triangle shape having the same inclination angle (angle with respect to the normal direction of the prism sheet 18), and the first direction A1 with respect to the normal H of the prism sheet 18, that is, the first illumination light. The inclination angle θ1 in the intensity peak direction of 24a and the second direction A2 with respect to the normal H, that is, the inclination angle θ2 in the intensity peak direction of the second illumination light 24b are substantially equal.

  FIG. 6 is an intensity distribution diagram of the first and second illumination lights 24a and 24b. In the figure, the positive angle is an upward direction with respect to the normal direction (the direction of 0 °) of the prism sheet 18. The angle and the negative angle of the liquid crystal display element 1 on the screen are the angles in the downward direction (the lower side of the screen of the liquid crystal display element 1) with respect to the normal direction.

  As shown in FIG. 6, the first and second illumination lights 24a and 24b irradiated from the surface light source 17 toward the liquid crystal display element 1 are in directions of a very narrow angle range of 4 ° to 5 °, respectively. The light that heads.

  That is, the surface light source 17 is directed substantially toward the liquid crystal display element 1 with the first illumination light 24a made of light substantially parallel to the first direction A1 and the second direction A2. The second illumination light 24b made of parallel light is selectively irradiated.

  The intensity distribution of the first and second illumination lights 24a and 24b shown in FIG. 6 is a distribution having a light intensity peak in a direction inclined by 2 ° to 3 ° with respect to the normal direction of the prism sheet 18. However, the intensity peak directions of the first and second illumination lights 24 a and 24 b correspond to the inclination angles of the two inclined surfaces of the plurality of prism portions 20 of the prism sheet 18.

  Therefore, based on the distance from the emission surface 21 of the prism sheet 18 to the liquid crystal display element 1, the distance from the liquid crystal display element 1 to the screen 16, and the pitch of the plurality of pixel rows 14 of the liquid crystal display element 1. By setting the inclination angles of the two inclined surfaces of the plurality of prism portions 20, a first directivity having a light intensity peak in a first direction A1 set in advance toward the liquid crystal display element 1 is obtained. Projection on the screen 16 of one row of light 24a and two rows of light transmitted through the pixels 13 of the two adjacent pixel rows 14 of the liquid crystal display element 1 of the first illumination light 24a. Light intensity in a second direction A2 parallel to a direction passing through the center of the region D2 between the regions D1 and D1 and the center of the pixel width in the direction orthogonal to the row direction of one of the two pixel rows 14 and 14. It can be irradiated and the second illumination light 24b having a directivity having a peak.

  Next, the driving means 25 for driving the liquid crystal display element 1 and the surface light source 17 will be described. This driving means 25 converts image data into odd-numbered image data and even-numbered image data for each screen data. The odd-numbered row image data and the even-numbered row image data are alternately written into each pixel 13 of the plurality of pixel rows 14 of the liquid crystal display element 1, and the surface light source is synchronized with the writing of the odd-numbered row image data. 17 irradiates one of the first and second illumination lights 24a and 24b, for example, the first illumination light 24a, and the other illumination light from the surface light source 17 in synchronism with the writing of the even-numbered row image data, that is, The second illumination light 24b is irradiated.

  FIG. 7 is a block circuit diagram of the driving means 25. The driving means 25 converts image data supplied from an external circuit (not shown) into odd-numbered image data and even-numbered image data for each screen data. , The first memory 27 and the second memory 28 for storing the odd-numbered row image data and the even-numbered row image data divided by the image data processing portion 26, and the first memory 27, respectively. Data for selectively reading the odd-numbered row image data stored in the second memory 28 and the odd-numbered row image data stored in the second memory 28, and supplying the read image data to the driver element 15 mounted on the liquid crystal display element 1. An output unit 29, and first and second light emitting elements 23a. The light source drive unit 30 selectively turns on the light source 23b, and the driver element 15, the image data processing unit 26, the data output unit 29, and the drive control unit 31 that controls the light source drive unit 30.

  The driving unit 25 divides the image data supplied from the external circuit into odd-numbered image data and even-numbered image data for each screen data by the image data processing unit 26. 27 and the second memory 28 respectively.

  Then, the driving means 25 adds one of the first memory 27 and the second memory 28, for example, the first divided frame of the two divided frames obtained by dividing one frame for displaying one screen into two. The odd-numbered row image data stored in one memory 27 is read by the data output unit 29 and supplied to the driver element 15, whereby the odd-numbered row image data is supplied to each pixel of the plurality of pixel rows 14 of the liquid crystal display element 1. 13 is applied with an operating voltage corresponding to the image data (writing of odd-numbered row image data), and in synchronization with the writing of odd-numbered row image data, the light source driving unit 30 causes the first light emitting element 23a of the surface light source to be turned on. The liquid crystal display element 1 is irradiated with the first illumination light 24 a from the surface light source 17.

  The driving means 25 reads the even-numbered row image data stored in the second memory 28 in the second divided frame of the two divided frames by the data output unit 29 and supplies it to the driver element 15. As a result, an operating voltage corresponding to the image data is applied to each pixel 13 of the plurality of pixel rows 14 of the liquid crystal display element 1 as the even-numbered row image data (writing of even-numbered row image data). The second light emitting element 23b of the surface light source is turned on by the light source driving unit 30 in synchronization with the data writing, and the second illumination light 24b is emitted from the surface light source 17 toward the liquid crystal display element 1. .

  In this liquid crystal display device, the first illumination light 24a is emitted from the surface light source 17 for a predetermined time after the odd-numbered row image data is written to each pixel 13 of all the pixel rows 14 of the liquid crystal display element 1. It is desirable to irradiate the second illumination light 24b from the surface light source 17 for a predetermined time after irradiating and writing the even-numbered row image data to each pixel 13 of all the pixel rows 14 of the liquid crystal display element 1. By doing so, the liquid crystal display element 1 can display an odd-numbered row image and an even-numbered row image of good quality without luminance unevenness.

In this liquid crystal display device, a plurality of pixels 13 for controlling the transmission of light are formed in a plurality of rows, and between each row, with substantially the same interval as the pixel width in the direction orthogonal to the row direction. Image data is written in each pixel 13 of the pixel row 14, and the liquid crystal display element 1 that displays an image corresponding to the image data is disposed on the observation side of the liquid crystal display element 1. A screen 16 on which an image is projected is disposed on the side opposite to the viewing side of the liquid crystal display element 1 and has a light intensity peak in a predetermined first direction A1 toward the liquid crystal display element 1. a first illuminating light 24a having sex, of the first of said light two lines passing through each of the pixels 13 of the liquid crystal display device 1 of the adjacent Ri mutually two pixel rows 14 of the illumination light 24a Projection area D1 on the screen 16 A second illumination light 24b having a directivity having a light intensity peak in a second direction A2 parallel to a direction passing through the region D2 between D1 and one of the two pixel rows 14 is selectively irradiated. The surface light source 17 and the image data are divided into odd-numbered image data and even-numbered image data for each screen data, and the odd-numbered row image data and even-numbered row image data are alternately displayed on the liquid crystal display element 1. Are written in each pixel 13 of the plurality of pixel rows 14, and the first illumination light 24 a is irradiated from the surface light source 17 in synchronization with the writing of the odd-numbered row image data, and in synchronization with the writing of the even-numbered row image data. the second for and a drive means 25 for irradiating the illumination light 24b, odd rows image and the even several lines image data corresponding to the odd row image data to the liquid crystal display element 1 from the surface light source 17 Te Even number corresponding to Images are alternately displayed, and these odd-numbered and even-numbered row images are projected onto the screen 16 alternately so that the even-numbered row images can be seen between the rows of the odd-numbered row images. It is possible to display an image having the number of pixel rows substantially twice the number of pixel rows.

  That is, in the liquid crystal display device, odd-numbered row image data is written to each pixel 13 of a plurality of pixel rows 14 formed in the liquid crystal display element 1 so as to be spaced from each other. By projecting one illumination light 24a, an odd row image corresponding to the odd row image data is displayed on the liquid crystal display element 1, and the odd row image is projected on the screen 16; The even-numbered row image data is written to each pixel 13 of the plurality of pixel rows 14 of the liquid crystal display element 1, and the second illumination light 24b is irradiated from the surface light source 17 in synchronization therewith. An even line image corresponding to the even line image data is displayed on the element 1, and the even line image projected on the screen 16 is alternately projected and displayed. Odd rows images and the even row images to display an image viewed alternately arranged.

  The screen 16 is a transmissive screen, and the odd row image and the even row image projected on the screen 16 are observed from the opposite side of the screen 16 to the side facing the liquid crystal display element 1.

  FIG. 8 shows the display when the odd-numbered row image data is written and the even-numbered row image data is written to the liquid crystal display element 1, and the liquid crystal display element 1 is shown in FIG. ), The odd-numbered row image 40a corresponding to the odd-numbered row image data is displayed, and the even-numbered row image data corresponding to the even-numbered row image data as shown in FIG. 40b is displayed. In FIGS. 8A and 8B, the filled portion 41 is a portion that looks black corresponding to the light shielding film 7 between the pixel rows 14.

  FIG. 9 shows the odd-numbered row image 40 a and the even-numbered row image 40 b projected on the screen 16, and the surface light source 17 is synchronized with the writing of the odd-numbered row image data to the liquid crystal display element 1. The odd number displayed by the liquid crystal display element 1 is irradiated with the first illumination light 24a and the second illumination light 24b is irradiated in synchronization with the writing of the even-numbered row image data to the liquid crystal display element 1. As shown in FIG. 9A, the row image 40a is projected onto the projection region D1 on the screen 16 of the light transmitted through the pixel rows 14 of the liquid crystal display element 1 in the first illumination light 24a. The even-numbered row image 40b displayed by the liquid crystal display element 1 is transmitted through each pixel row 14 of the liquid crystal display element 1 in the second illumination light 24b as shown in FIG. 9B. In front of light Projection area on the screen 16, i.e., is projected onto the region D2 shifted with respect to the projection area D1 of each row in the odd-numbered rows image 40a by one pixel row minutes. Note that the areas other than the projection areas D1 and D2 of the image on the screen 16 appear black when the odd-numbered line image 40a is projected and when the even-numbered line image 40b is projected.

  The liquid crystal display device alternately projects the odd-numbered row image 40a and the even-numbered row image 40b on the screen 16, so that the odd-numbered row image 40a and the even-numbered row image 40b are alternately presented to a display observer. Images that can be seen side by side can be displayed.

  FIG. 10 shows an observed image 42, and the observed image 42 includes a plurality of pixels, the number of rows of the liquid crystal display element 1 being twice the number of pixel rows and the number of pixel rows of the liquid crystal display element 1. This is an image of the same quality as the display image of the liquid crystal display element formed at a dense pitch that is 1/2 the pitch.

  As described above, the liquid crystal display device writes the odd-numbered row image data to each pixel 13 of the plurality of pixel rows 14 of the liquid crystal display element 1 and irradiates the first illumination light 24 a from the surface light source 17. Thus, the odd-numbered row image 40a corresponding to the odd-numbered row image data is projected on the screen 16 at intervals corresponding to the intervals between the plurality of pixel rows 14 of the liquid crystal display element 1, and a plurality of the liquid crystal display elements 1 are projected. The odd-numbered image data corresponding to the odd-numbered row image data is displayed on the screen 16 by writing the even-numbered row image data to each pixel 13 of the pixel row 14 and irradiating the second illumination light 24b from the surface light source 17. Since the row image 40a is projected while being shifted from the projection region D1 of the odd-numbered row image 40a, the odd-numbered row image 40a and the even-numbered row image 40b are viewed in a row alternately. Substantially twice the pixel image the number of rows of can be displayed.

  Therefore, for example, in order to display a high-definition image having 640 pixel rows, the number of pixel rows of the liquid crystal display element 1 may be 320.

  In the liquid crystal display element 1, the plurality of pixels 13 are formed in a plurality of rows and between each row with substantially the same interval as the pixel width in the direction orthogonal to the row direction. The liquid crystal display element 1 can be easily designed and manufactured, and the driver elements 15 for driving the liquid crystal display element 1 may have a number of terminals corresponding to the number of pixel rows of the liquid crystal display element 1.

  Therefore, according to this liquid crystal display device, display of a high-definition image can be realized at low cost.

  In addition, the liquid crystal display device emits from the surface light source 17 the first illumination light 24a made of light substantially parallel to the first direction A1 and the light substantially parallel to the second direction A2. Therefore, the edges of the odd-numbered row image 40a and the even-numbered row image 40b projected on the screen 16 do not appear to overlap each other. Therefore, a high-quality high-definition image can be displayed.

  Furthermore, since the liquid crystal display device includes the light shielding film 7 corresponding to the region between the plurality of pixel rows 14 in the liquid crystal display element 1, when the odd row image 40 a is projected onto the screen 16. The region other than the projection region D1 of the odd-numbered row image 40a, that is, the projection region D2 of the even-numbered row image 40b is made black, and the region other than the projection region D2 of the even-numbered row image 40b is projected. The projection area D2 of the row image 40a can be made black, so that the contrast reduction of the odd-numbered row image 40a and the even-numbered row image 40b projected on the screen 16 can be eliminated and a high-definition image with high contrast can be displayed. it can.

  Note that the liquid crystal display device of the above embodiment includes the transmissive screen 16, but the screen on which the display image of the liquid crystal display element 1 is projected is the side facing the liquid crystal display element 1, that is, the screen. A reflective screen for observing the projected image from the image projection side, and the reflective screen is disposed on the observation side of the liquid crystal display element 1 so as to be inclined in the row direction with respect to the liquid crystal display element 1; Also good.

  In the liquid crystal display device of the above embodiment, the odd row image 42a and the even row image 42b displayed by the liquid crystal display element 1 are projected onto the screen 16 as they are. May be arranged far away from the liquid crystal display element 1, and the odd-numbered row image 42a and the even-numbered row image 42b displayed by the liquid crystal display device 1 may be enlarged by a projection lens and projected onto the screen. .

  Furthermore, the surface light source disposed on the opposite side of the liquid crystal display element 1 from the observation side is not limited to that of the above-described embodiment, and the light intensity of the surface light source is set in a predetermined first direction toward the liquid crystal display element 1. On the screen of the first illumination light having directivity having a peak and the light of two rows transmitted through each pixel of two adjacent pixel rows of the liquid crystal display element of the first illumination light. Is selectively irradiated with second illumination light having directivity having a light intensity peak in a second direction parallel to a direction passing through a region between the projection regions and one of the two pixel rows. Any other configuration may be used.

  The present invention can also be applied to a field sequential liquid crystal display device that displays a color image using a liquid crystal display element that does not include a color filter. In this case, the liquid crystal display elements are formed at intervals. For each pixel in a plurality of pixel rows, odd-numbered row image data of unit colors of red, green, and blue and even-numbered row image data of unit colors of red, green, and blue are alternately arranged in any order. In synchronization with the writing of the odd-numbered row image data of the unit colors of red, green, and blue, the first illumination light of red, green, and blue is irradiated from the surface light source in synchronization with each other, and the red, green, blue The second illumination light of red, green, and blue may be emitted from the surface light source in synchronization with the writing of even-numbered row image data of the unit colors.

1 is an exploded perspective view of a liquid crystal display device showing an embodiment of the present invention. The side view of the said liquid crystal display device. FIG. 3 is an enlarged cross-sectional view of a portion along the vertical direction of the screen of the liquid crystal display element in the liquid crystal display device. FIG. 3 is an enlarged cross-sectional view of a portion along the left-right direction of the screen of the liquid crystal display element. FIG. 3 is an outgoing light diagram of first and second illumination light from a surface light source in the liquid crystal display device. FIG. 3 is an intensity distribution diagram of the first and second illumination lights. FIG. 3 is a block circuit diagram of driving means in the liquid crystal display device. The figure which shows the display at the time of odd-numbered line image data writing of the said liquid crystal display element, and even-numbered line image data writing. The figure which shows the odd line image and even line image which were projected on the screen. The figure which shows the image observed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element, 2, 3 ... Substrate, 4 ... Pixel electrode, 5 ... TFT, 6 ... Counter electrode, 7 ... Light-shielding film, 8R, 8G, 8B ... Color filter, 9 ... Liquid crystal layer, 10, 11 ... Polarization Plate, 12 ... screen area, 13 ... pixel, 14 ... pixel row, 15 ... driver element, 16 ... screen, 17 ... surface light source, 18 ... prism sheet, 19 ... entrance surface, 20 ... prism portion, 21 ... exit surface, 22 ... reflector, 23a, 23b ... light emitting element, A1 ... first direction, 24a ... first illumination light, A2 ... second direction, 24b ... second illumination light, 25 ... driving means, 40a ... odd number Line image, 40b ... even line image, 42 ... observation image.

Claims (1)

A plurality of pixels for controlling the transmission of light to form a plurality pixels arranged row in the row direction is a horizontal direction of the screen, the pixel row direction of the pixel width that is perpendicular to the row direction between the pixel rows Are formed at substantially the same interval, and a light shielding film corresponding to an area between the plurality of pixel rows is provided, and an operating voltage corresponding to image data is applied to each pixel of the plurality of pixel rows. A liquid crystal display element for displaying an image according to the image data;
A screen disposed on the viewing side of the liquid crystal display element, on which a display image of the liquid crystal display element is projected;
Each image of the pixel row on the screen is disposed on the side opposite to the viewing side of the liquid crystal display element and includes light substantially parallel to a predetermined first direction toward the liquid crystal display element. Is substantially parallel to a first direction that projects at a distance corresponding to one pixel row and a second direction that differs from the first direction by an angle corresponding to the one pixel row. It comprises a light and a second illumination light to project each image of the pixel rows in the distance on the screen corresponding to one pixel row in each image projected on the first the screen by illuminating light A surface light source for selectively illuminating,
The image data is divided into odd-numbered image data and even-numbered image data for each screen data, and these odd-numbered row image data and even-numbered row image data are alternately arranged in each of the plurality of pixel rows of the liquid crystal display element. writing to the pixel, in Rukoto to irradiate the odd rows in synchronism with the writing of the image data from said surface light source first illumination light to project the odd rows image corresponding to the odd-numbered row image data, the even rows Driving means for projecting an even row image corresponding to the even row image data by irradiating the second illumination light from the surface light source in synchronization with writing of image data ;
Equipped with a,
When the first illumination light and the second illumination light are selectively emitted from the surface light source, the light shielding film is provided between the plurality of pixel rows, whereby the screen is provided. A liquid crystal display device , wherein the odd-numbered row image and the even-numbered row image projected on each row are set so as not to overlap each other .

Images