JP2009265240A - Liquid crystal panel, liquid crystal panel device, display device, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal panel and a liquid crystal panel device, which prevent an influence of a crosstalk between pixels; and to provide a display and a projector using the liquid crystal panel or the liquid crystal panel device. <P>SOLUTION: The liquid crystal panel 1 includes a liquid crystal 15 with a set orientation direction, a plurality of color filters 13A-13C having a plurality of color dispersion filters for dispersing an incident light into a plurality of color components, a plurality of white filters 13D provided between the plurality of color dispersion filters, and a plurality of luminous energy-regulating electrodes 12A-12D for regulating luminous energies transmitted through the color dispersion filters and the white filters by controlling the orientation of the liquid crystal, and an displaying pixel array is constituted of a plurality of pixels corresponding to the plurality of color dispersion filters 13A-13C and a plurality of pixels corresponding to the plurality of white filters 13D. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal panel, a liquid crystal panel device, a display device, and a projector.

In order to prevent a crosstalk phenomenon caused by signal lines, an active matrix liquid crystal panel in which slits along the signal line direction are formed in a common electrode is known as a prior art (see, for example, Patent Document 1).
JP-A-6-118447

  As the pixel size is miniaturized, it is necessary to suppress the influence of crosstalk caused by pixel electrodes in addition to crosstalk caused by signal lines.

(1) The liquid crystal panel according to the first aspect of the present invention includes a liquid crystal in which an orientation direction is set, a color filter having a plurality of color separation filters for separating incident light into a plurality of color components, and a plurality of color separation filters. And a plurality of pixels corresponding to the plurality of color separation filters, including a plurality of white filters provided on the liquid crystal display, and a color separation filter that controls the orientation of the liquid crystal and a light amount adjustment electrode that adjusts the amount of light transmitted through the white filter. And a plurality of pixels corresponding to the plurality of white filters constitute a display pixel array.
(2) The invention of claim 2 is the liquid crystal panel according to claim 1, wherein the light amount adjustment electrode includes a pixel electrode provided for each of the color separation filter and the white filter and a common electrode common to the pixel electrodes. Features.
(3) The invention of claim 3 is the liquid crystal panel according to claim 2, provided on the common electrode side, provided on the first alignment film and pixel electrode side for aligning the liquid crystal in the first direction, A second alignment film that is aligned in two directions is provided, and the white filter is arranged adjacent to a direction substantially perpendicular to the second direction that is the liquid crystal alignment on the second alignment film side with respect to the color separation filter. To do.
(4) According to a fourth aspect of the present invention, in the liquid crystal panel according to the second aspect, in the case where the white filter is not disposed, when the white filter is not disposed, the pixel is caused by the disorder of the liquid crystal orientation due to the pixel signal applied to the adjacent pixel electrode. It arrange | positions in the area | region where the light quantity of the light which permeate | transmits falls more than predetermined value.
(5) The invention according to claim 5 is the liquid crystal panel according to any one of claims 1 to 4, wherein the color separation filter has a polygonal shape having six or more corners. To do.
(6) The invention of claim 6 is the liquid crystal panel according to any one of claims 1 to 4, wherein the shape of the white filter is a triangle or a quadrangle.
(7) The invention according to claim 7 is the liquid crystal panel according to any one of claims 1 to 6, wherein the plurality of color separation filters are arranged in a delta arrangement, the shape of the white filter is a parallelogram, and the white filter When the rectangular side is formed by combining the short side, the side of the diagonal line and the side that is not in contact with the white filter of the color separation filter, the length of the diagonal line of the white filter is half the length of the long side of the rectangular shape It is characterized by 1.
(8) In the liquid crystal panel according to claim 3, when the shape of the white filter is a quadrangle having a long side, the angle formed by the long side of the white filter and the second direction is 0 °. Or it is an acute angle.
(9) The invention of claim 9 is the liquid crystal panel according to any one of claims 1 to 8, wherein the ratio of the total area of the white filter to the total area of the color separation filter is 20% or less. Features.
(10) The invention of claim 10 is the liquid crystal panel according to any one of claims 1 to 8, wherein the total area of the white filter is equal to or less than the total area of each of the plurality of color separation filters. To do.
(11) A liquid crystal panel device according to an eleventh aspect of the present invention is a pixel signal generating means for generating a pixel signal to be applied to the liquid crystal panel according to any one of the first to tenth aspects and the light amount control electrode, When the pixels displayed by the two color separation filters adjacent to each other with the white filter interposed therebetween display other than black, the brightness gradation of the pixels displayed by the white filter has two colors adjacent to each other with the white filter interposed therebetween. It is characterized by comprising pixel signal generation means for generating a pixel signal so as to be a value equal to or lower than the gradation value of the brightness of the pixel displayed by the decomposition filter.
(12) A liquid crystal panel device according to a twelfth aspect of the present invention is a pixel signal generating means for generating a pixel signal to be applied to the liquid crystal panel according to any one of the first to tenth aspects and the light amount control electrode, When three of the four color separation filters surrounding the white filter are color separation filters corresponding to the respective color components, and the brightness gradation values of the respective pixels respectively displayed by the four color separation filters are the same, Pixel signal generation means for generating a pixel signal so that the brightness gradation value of the pixel displayed by the white filter is equal to the brightness gradation value of the pixel displayed by the four color separation filters; It is characterized by providing.
(13) A liquid crystal panel device according to a thirteenth aspect of the present invention is a pixel signal generating means for generating a pixel signal to be applied to the liquid crystal panel according to any one of the first to tenth aspects and the light amount control electrode, When the shape of the white filter is a rectangle having a long side and the pixel displayed by the color separation filter in contact with the long side of the white filter displays black, the brightness gradation of the pixel displayed by the white filter And a pixel signal generating means for generating a pixel signal so that the value of is larger than 0.
(14) A liquid crystal panel device according to a fourteenth aspect of the invention is a liquid crystal panel according to any one of the first to tenth aspects, and pixel signal generating means for generating a pixel signal to be applied to the light amount control electrode. When the color separation filter corresponding to the pixel displaying black is in contact with the white filter on the side substantially orthogonal to the first rubbing direction, the brightness gradation value of the pixel displayed by the white filter is greater than zero. And a pixel signal generating means for generating a pixel signal.
(15) A liquid crystal panel device according to a fifteenth aspect of the present invention is a liquid crystal panel according to any one of the first to tenth aspects, and a pixel signal generating means for generating a pixel signal to be applied to the light amount control electrode. When the shape of the white filter is a rectangle having a long side and the pixel displayed by the color separation filter in contact with the long side of the white filter displays black, the brightness gradation of the pixel displayed by the white filter Pixel signal generating means for generating a pixel signal so that the value of becomes zero.
(16) A display device according to a sixteenth aspect of the invention includes the liquid crystal panel according to any one of the first to tenth aspects.
(17) A display device according to a seventeenth aspect of the invention includes the liquid crystal panel device according to any one of the eleventh to fifteenth aspects.
(18) A projector according to an eighteenth aspect of the invention includes the liquid crystal panel according to any one of the first to tenth aspects.
(19) A projector according to a nineteenth aspect of the invention includes the liquid crystal panel device according to any one of the eleventh to fifteenth aspects.

  According to the present invention, it is possible to suppress the display brightness of the liquid crystal panel from being reduced due to the influence of an electric field between pixels.

-LCD panel-
The best mode for carrying out the present invention will be described below with reference to the drawings. The liquid crystal panel according to the embodiment of the present invention includes a pixel (hereinafter referred to as a sub pixel) that emits white light between pixels including a color filter. It can suppress that the brightness of a display reduces.

  FIG. 1 is a view for explaining the structure of a liquid crystal panel 1 according to an embodiment of the present invention. The liquid crystal panel 1 according to the first embodiment of the present invention is a reflective liquid crystal panel, and realizes a function as a display element using incident light incident on the liquid crystal panel 1. The liquid crystal panel 1 is a TN (Twisted Nematic) type liquid crystal panel, in which liquid crystal molecules are twisted by 90 ° by reflection with the surface direction of the liquid crystal panel 1 as an axis. Further, the liquid crystal panel 1 is an active matrix type liquid crystal panel using TFTs (Thin Film Transistors), and an on / off switch using TFTs is formed in each pixel.

  The liquid crystal panel 1 includes a TFT element-formed Si substrate 11, a pixel electrode 12, a color filter aggregate 13, an alignment film 14, a liquid crystal 15, an alignment film 16, a common electrode 17, and a glass substrate 18. The liquid crystal panel 1 is used in combination with a PBS (polarization beam splitter) block. Here, the PBS block is, for example, a cubic polarizer in which a polarization separation film is vapor-deposited on a slope of a right-angle prism and the slopes (polarization planes) are bonded to each other. Of the light incident on the PBS block, light in a predetermined vibration direction is transmitted through the polarization plane, and other light in the predetermined vibration direction is reflected on the polarization plane.

  Hereinafter, a case where the liquid crystal panel 1 is used for a projector will be described as an example. FIG. 2A illustrates the projector 3 using the liquid crystal panel 1. Reference numeral 2 indicates a projected image projected by the projector 3. The projector 3 will be described with reference to FIG. 2B. The projector 3 includes an LED light source 31, a condensing optical system 32, a PBS block 33, the liquid crystal panel 1, and a projection optical system 34. In the projector 3, a drive current is supplied to the LED light source 31 via a harness and a pattern (not shown). The LED light source 31 emits light with brightness according to the drive current toward the condensing optical system 32. The condensing optical system 32 converts the LED light into substantially parallel light and enters the PBS block 33. Among the light beams incident on the PBS block 33, P-polarized light passes through the PBS block 33 and illuminates the liquid crystal panel 1. The irradiated light is reflected by the liquid crystal panel 1. The reflected light reflected from the liquid crystal panel 1 enters the PBS block 33. This incident light is S-polarized light, is reflected by the polarization plane 33a of the PBS block 33, and is emitted toward the projection optical system 34 as projection light. The light beam incident on the projection optical system 34 is projected forward of the projector.

  Next, each configuration of the liquid crystal panel 1 will be described with reference to FIG. The TFT element-formed Si substrate 11 is a Si substrate having a TFT element formed on the surface thereof. The TFT element is an on / off switch that is formed corresponding to each pixel electrode, and controls charge (pixel signal) charge in the pixel electrode described later. When the TFT element is on, a current flows through the pixel electrode, the electric charge is charged in the pixel electrode, and a voltage is applied to the liquid crystal 15. When the TFT element is turned off, the charge charged in the pixel electrode does not flow to the outside, so that the charge charged in the pixel electrode is held and the voltage application of the liquid crystal 15 is held. Thereafter, when the TFT element is turned on, a current flows from the pixel electrode, the charge charged in the pixel electrode is discharged, and the voltage application of the liquid crystal 15 is released.

  A pixel electrode 12 provided for each pixel described later is a reflective metal electrode such as an aluminum plate, and applies a voltage to the liquid crystal 15. The pixel electrode 12 is formed on the TFT element-formed Si substrate 11. The plurality of pixel electrodes 12 are arranged in parallel in the vertical and horizontal directions, and the charges charged in the pixel electrodes 12 are sequentially controlled for each pixel electrode in accordance with the on / off state of the TFT element.

  The color filter aggregate 13 is an aggregate of a plurality of color separation filters that decompose incident light into a plurality of color components and a white filter. The color filter aggregate 13 is manufactured by a photolithography process, and a red (R) filter 13A that transmits only red light, a green (G) filter 13B that transmits only green light, and blue (B) that transmits only blue light. The filter is composed of a white (W) filter 13D that transmits all colors. The shapes of the R filter 13A, the G filter 13B, and the B filter 13C are hexagons (see FIG. 3A). Hereinafter, these filters 13A to 13C are collectively referred to as color filters. The shape of the white filter 13D is a parallelogram (see FIG. 3A). The color filters 13A to 13C and the white filter 13D are formed on each pixel electrode 12.

  The color filters 13A to 13C are delta-arranged as shown in FIG. That is, the R filter 13A, the G filter 13B, and the B filter 13C are arranged so that their center positions are triangular. One color filter 13A to 13C and the corresponding TFT element-forming Si substrate 11, pixel electrode 12, alignment film 14, liquid crystal 15, alignment film 16, common electrode 17 and glass substrate 18 constitute one pixel. Based on the principle of additive color mixing, all colors can be reproduced by a combination of light transmitted through the R filter 13A, G filter 13B, and B filter 13C.

  As shown in FIG. 3A, the white filter 13D is arranged so that the long side is adjacent to the side in the predetermined direction of the color filters 13A to 13C. One white filter 13D and the corresponding TFT element forming Si substrate 11, pixel electrode 12, alignment film 14, liquid crystal 15, alignment film 16, common electrode 17 and glass substrate 18 constitute one subpixel. The pixel of the R filter 13A is called an R pixel, the pixel of the G filter 13B is called a G pixel, and the pixel of the B filter 13C is called a B pixel. The liquid crystal panel 1 is configured as an aggregate of R pixels, G pixels, B pixels, and sub-pixels.

  The alignment films 14 and 16 are films for aligning liquid crystal molecules in a predetermined direction. The alignment films 14 and 16 have a thickness of about 0.1 μm and are made of a polymer film such as polyimide. The alignment films 14 and 16 are produced by performing a rubbing process on the surface of the polymer film. The rubbing process is a process of rubbing the surface of the polymer film with a cloth wound around a roller. Liquid crystal molecules in contact with the alignment films 14 and 16 at the interface between the liquid crystal 15 and the alignment films 14 and 16 are aligned in the rubbing direction. Hereinafter, the direction in which the liquid crystal molecules are aligned is referred to as a rubbing direction. In this case, the rubbing direction is the direction in which the surface of the polymer film is rubbed with the cloth wound around the roller. The rubbing directions of the two alignment films 14 and 16 form an angle of 45 °. Since the liquid crystal molecules have the property of being aligned in the same direction, the alignment direction of the liquid crystal molecules gradually changes from the rubbing direction of the alignment film 14 to the rubbing direction of the alignment film of the light distribution film 16. Thereby, the liquid crystal molecules are arranged to be twisted by 45 ° with the surface direction of the liquid crystal panel 1 as an axis. Since the liquid crystal panel 1 is of a reflective type, the light incident on the liquid crystal 15 becomes a reciprocating optical path, and the polarization changes corresponding to a 90 ° twist by reciprocating the liquid crystal.

  The common electrode 17 is a transparent electrode such as ITO (Indium Tin Oxide) provided to face the pixel electrode 12. The common electrode 17 is also formed by plasma CVD or sputtering. The common electrode 17 is connected to the ground potential, and an electric field is generated in the liquid crystal due to a potential difference between the common electrode 17 and the pixel electrode 12 charged with electric charge.

  With reference to FIG. 1, the principle of display / non-display on the projection surface of each pixel of the liquid crystal panel 1 will be described.

  When the pixels of the liquid crystal panel 1 are displayed on the projection surface, the pixel electrode 12 is not charged. At this time, the arrangement of the liquid crystal molecules in the liquid crystal 15 is the 45 ° twisted arrangement described above.

  When the PBS block 33 is irradiated with light from the LED light source 31, only P-polarized light enters the liquid crystal panel 1. Then, the P-polarized light is transmitted through the glass substrate 18, the common electrode 17 and the alignment film 16. Thereafter, the light passes through the liquid crystal 15, the alignment film 14, and the color filters (white filters) 13 </ b> A to 13 </ b> C (13 </ b> D) and is reflected by the pixel electrode 12.

  The reflected light finally becomes S-polarized light whose oscillation direction is rotated by 90 ° with respect to the P-polarized light incident due to the twisted arrangement of the liquid crystal molecules in the liquid crystal 15 by the reflection of the pixel electrode 12. Then, the P-polarized light is reflected from the polarization plane 33 a and emitted from the projector 3.

  On the other hand, when the pixels of the liquid crystal panel 1 are not displayed on the projection surface, the reflective pixel electrode 12 is charged. At this time, the liquid crystal molecules in the liquid crystal 15 are aligned in the direction of the electric field. In this case, since the vibration direction of the P-polarized light reflected by the liquid crystal panel 1 does not rotate by 90 °, the reflected light of the liquid crystal panel 1 is P-polarized light and is transmitted without being reflected by the polarization plane 33a of the PBS block. It is not emitted from.

  By controlling the charge of the pixel electrode 12 as described above, only the R pixel is displayed on the projection surface, or only the R pixel and the G pixel are displayed on the projection surface. All colors can be reproduced on the projection plane.

  Similarly, by controlling the charge of the pixel electrode 12 for the sub-pixel, the display of the sub-pixel can be prevented from being displayed on the projection surface.

  With reference to FIG. 3 to FIG. 5, suppression means for suppressing the influence of the electric field by the pixel electrode adjacent to each pixel will be described in each pixel. Here, it is assumed that only the pixel of the G filter 13B is displayed on the projection surface, and the R pixel and the B pixel are not displayed. In this case, the pixel electrode 12 in the R pixel and the B pixel is charged with a charge, and the pixel electrode 12 in the G pixel is not charged.

  FIG. 3A is a diagram for explaining the color filter aggregate 13 in the embodiment of the present invention. As described above, the shape of the color filters 13A to 13C is a hexagon, and the color filters 13A to 13C are arranged in a delta arrangement. The shape of the white filter 13D is a parallelogram, and the white filter 13D is arranged so that its long side is in contact with a side in a predetermined direction of the color filters 13A to 13C. FIG. 3B is a diagram for explaining the rubbing direction of the alignment film 14 on the pixel electrode 12 side in the embodiment of the present invention. The rubbing direction of the alignment film 14 on the pixel electrode 12 side is a diagonal direction (DL) that proceeds from the lower left to the upper right of the color filters 13A to 13C. FIG. 3C is a view for explaining the rubbing direction of the alignment film 16 on the common electrode 17 side in the embodiment of the present invention. The rubbing direction of the alignment film 16 on the common electrode 17 side is a direction (PL) that forms an angle of 45 ° with the rubbing direction of the alignment film 14.

  As shown in FIGS. 3A and 3B, the long side of the white filter 13D is a direction substantially orthogonal to the rubbing direction (DL) of the alignment film 14 on the pixel electrode 12 side in the color filters 13A to 13C. It is arranged so as to touch the side located at. Further, the direction of the long side of the white filter 13D is the same as the rubbing direction (DL) of the alignment film 14 on the pixel electrode 12 side.

  FIG. 4 is an enlarged view of the projection image 2 projected on the projection surface. The amount of display light of the G pixel is reduced by the influence of the charge charges on the pixel electrodes of the adjacent R pixel and B pixel (see FIG. 5B described later). However, by causing the sub-pixels of the white filters 13D1 and 13D2 whose long sides are in contact with the G filter 13B to emit light, it is possible to suppress a reduction in luminance in the display of the G pixel.

  With reference to FIG. 5, a comparative example of the liquid crystal panel 1 of the embodiment of the present invention will be described. The rubbing direction of the alignment films 14 and 16 in the liquid crystal panel 1A of the comparative example will be described as being the same as the rubbing direction of the embodiment. FIG. 5A is a diagram for explaining the color filter aggregate 13 in the comparative example. The color filter has a rectangular shape, and no white filter is formed in the color filter aggregate 13. In this case, as shown in the enlarged view of the projection image 2A in FIG. 5B, the display light amount of the pixel is reduced around the upper left corner and the lower right corner of the G filter 13B, and the display light amount of the pixel is reduced. .

  In the liquid crystal panel 1A of the comparative example, the amount of display light is reduced by the following action. When the pixel of the R filter 13A and the pixel of the B filter 13C are not caused to emit light, as shown in FIG. 6A, the pixel electrodes 12A and 12C are charged, and the liquid crystal molecules are transferred from the pixel electrodes 12A and 12C to the common electrode 17. Orient in the direction. The electric field generated from the pixel electrodes 12A and 12C is generated toward the common electrode 17 and also toward the pixel electrode 12B of the G pixel, and 45 of the liquid crystal molecules 15a and 15b in the vicinity of the pixel electrode 12B of the G pixel. ° The twisted arrangement will be destroyed. As a result, the vibration direction of the light incident on the vicinity of the R filter 13A and the B filter 13C out of the light incident on the G filter 13B is not rotated by 90 °, and the display light amount of the G pixel is reduced. In the corner portion on the side substantially orthogonal to the rubbing direction (DL) on the pixel electrode 12B side of the G pixel, the electric fields from the two pixels in contact with the corner are combined, and a strong electric field in a direction substantially perpendicular to the rubbing direction (DL) is generated. As a result, the degree to which the 45 ° twist alignment of the liquid crystal molecules collapses becomes large. For this reason, as shown in FIG. 5B, it is considered that the display light amount of the pixel is reduced around the upper left corner and the lower right corner of the G filter 17B.

  In the embodiment of the present invention, the degree of display light amount reduction of the G pixel is smaller than that of the comparative example. As shown in FIG. 6B, the pixel electrode 12D of the white filter 13D is provided between the pixel electrode 12A of the R pixel and the pixel electrode 12C of the B pixel. This is probably because the influence of the electric field on the G pixel from the pixel electrodes 12A and 12C is reduced. That is, the sub-pixel plays a role of an electric field relaxation region between the pixels. For example, in FIG. 6B, the liquid crystal molecules 15c and 15d near the pixel electrode 12D of the white filter 13D are affected by the electric field from the pixel electrode 12A of the R pixel and the pixel electrode 12C of the B pixel, but the white filter 13D. The arrangement of the pixel electrode 12D increases the distance between the pixel electrode 12A and the pixel electrode C, and the liquid crystal molecules on the pixel electrode 12B of the G pixel are generated by the electric field from the pixel electrode 12A of the R pixel and the pixel electrode 12C of the B pixel. Not affected.

-LCD panel device-
A liquid crystal panel device 100 according to an embodiment of the present invention will be described with reference to FIG. The liquid crystal panel device 100 includes a liquid crystal panel 1 and a liquid crystal panel control circuit 110. The liquid crystal panel control circuit 110 outputs a drive signal to the liquid crystal panel 1 and controls the pixels and sub-pixels. Thereby, the liquid crystal panel 1 generates an image according to the drive signal.

  Next, sub-pixel control by the liquid crystal panel control circuit 110 will be described with reference to FIGS. As shown in FIG. 9, when the display of two color pixels 62A and 62B adjacent to each other with the sub pixel 62D interposed therebetween is other than black display (brightness gradation is 0), the pixel is sandwiched between the two color pixels 62A and 62B. The brightness gradation of the sub-pixel 62D is set to be equal to or lower than the brightness gradation of the two color pixels 62A and 62B. Thereby, it can suppress that the display of the liquid crystal panel 1 becomes whitish by the display of the subpixel 62D. For example, when the gradation of the color pixel 62A is 100 and the gradation of the color pixel 62B is 200, the gradation of the sub pixel 62D is set to a value of 100 or less.

  As shown in FIG. 10, when the three color pixels surrounding the sub pixel 63D are the pixels 63A to 63C of the respective color filters 13A to 13C, and the brightness gradations of the three color pixels 63A to 63C are equal, The 63D brightness gradation is set to the same value as those gradations. Thereby, the balance of the brightness of the sub-pixel 63D with respect to the surrounding color pixels 63A to 63C can be maintained. For example, when the gradation of the color pixels 63A to 63C is 100, the gradation of the sub-pixel 62D is set to 100.

  As shown in FIG. 11, when the adjacent color pixel 64C displays black (the brightness gradation value is 0), the brightness gradation value of the sub-pixel 64D is set larger than zero. Since the gray level of the pixel is large, the electric field strength generated from the pixel electrode 12D of the sub-pixel 64D is smaller than the electric field strength generated from the pixel electrode 12C of the color pixel 64C, so the electric field of the color pixel 64C is changed to the color pixel 64A. Can be weakened. In particular, since the influence on a pixel adjacent in a direction substantially orthogonal to the rubbing direction (DL) on the pixel electrode 12 side is great, the color pixel 64C in contact with the long side of the sub-pixel 64D having a rectangular shape having a long side. When black is displayed, the brightness gradation value of the sub-pixel 64D is made larger than zero. That is, the brightness gradation value of the sub-pixel 64D formed in a direction substantially orthogonal to the rubbing direction (DL) on the pixel electrode 12 side of the black display color pixel 64C is made larger than zero. For example, when the gradation of the color pixel 63C is 0, the gradation of the sub pixel 64D is set to 1 or more.

  When the adjacent color pixel 64C displays black (the brightness gradation value is 0), instead of making the brightness gradation value of the sub-pixel 64D larger than 0, as shown in FIG. When the color pixel 65C with which the long sides of 65D1 and 65D2 are in contact is displayed in black (the brightness gradation value is 0), the brightness gradation value of the sub-pixels 65D1 and 65D2 is set to 0. Also good. This is to prevent the white sub-pixels 65D1 and 65D2 from floating and appearing in the black color pixel 65C.

According to the embodiment described above, the following operational effects can be obtained.
(1) A pixel (sub-pixel) of the white filter 13D is formed adjacent to a direction side substantially orthogonal to the rubbing direction (DL) of the alignment film 14 on the pixel electrode 12 side of the pixel including the color filters 13A to 13C. I tried to do it. Thereby, it can suppress that the brightness of the display of the liquid crystal panel 1 reduces by the influence between the pixels in the pixel provided with the color filter. In addition, the sub-pixel provided with the white filter 13D also serves as a relaxation region that reduces the influence of the electric field between the pixels in the pixel provided with the color filter.

(2) Since the white filter is used as the color filter of the sub pixel, the hue of display is not changed by the light emission of the sub pixel. When the sub-pixel emits light, the chromaticity of red displayed on the liquid crystal panel 1 moves from R to R ′ and the chromaticity of green changes from G to G ′ as shown in the graph representing the chromaticity coordinates in FIG. And the blue chromaticity moves from B to B ′. Here, R, G, and B are chromaticities of red, green, and blue projected on the projection surface when the white filter 13D is not displayed. Thus, by displaying the white filter 13D, the chromaticity that the liquid crystal panel 1 can display moves to the white chromaticity (W) side, and the range of colors that can be displayed becomes narrow. However, since the balance of the entire color is maintained, the hue of display is not changed by the light emission of the white filter 13D.

-Modification-
The above embodiment can be modified as follows.
(1) In the above embodiment, the shape of the pixel (sub-pixel) of the white filter 13D is a parallelogram, but is not particularly limited. For example, the shape of the sub-pixel may be a square as shown in FIGS. 13A and 13A, or may be a triangle as shown in FIGS. 13B and 13B. Good.

(2) The shape of the pixels (color pixels) of the color filters 13A to 13C is a hexagon. However, the shape is not limited to the embodiment as long as the number of corners is a polygon with 6 or more. For example, it may be octagonal as shown in FIGS. 13 (a) and 14 (b). By forming the color pixel into a polygonal shape having six or more corners, the pixels can be arranged with almost no gap in the liquid crystal panel even if the sub-pixels are adjacent to each other.

(3) As shown in FIG. 15, when the diagonal and short sides of the parallelogram of the sub-pixel 61D are combined with the side that is not in contact with the sub-pixel 61D among the sides of the hexagonal color pixel 61A, a rectangular shape ( In the case of the thick line 61E), the diagonal length of the parallelogram of the sub-pixel 61D is preferably ½ of the length of the long side of the rectangular shape 61E. Thereby, the sub-pixels 61D can be regularly arranged on the liquid crystal panel 1.

(4) When the shape of the sub-pixel is a rectangular shape or a parallelogram, the direction of the long side is the rubbing direction (DL) if the angle formed with the rubbing direction (DL) on the pixel electrode 12 side is an acute angle. They do not have to be parallel. As a result, the length of contact between the long side of the sub-pixel and the side perpendicular to the rubbing direction (DL) of the color pixel can be increased, and the effect of the sub-pixel can be increased.

(5) The total area of the white filters 13D in the liquid crystal panel 1 is preferably 20% or less of the total area of the color filters 13A to 13C. If it is larger than 20%, the shift amount from R to R ′, the shift amount from G to G ′, and the shift amount from B to B ′ shown in FIG. This is because the range becomes too narrow. For the same reason, the total area of the sub-pixels is preferably 20% or less of the total area of the color pixels.

(6) The total area of the white filters 13D in the liquid crystal panel 1 is preferably equal to or less than the total area of the color filters 13A to 13C. Specifically, the total area of the white filter 13D is less than or equal to the total area of the red filter 13A, less than or equal to the total area of the green filter 13B, and less than or equal to the total area of the blue-red filter 13C. It is preferable. Similarly, the total area of the sub-pixels is preferably equal to or less than the total area of the color pixels (R pixel, G pixel, and B pixel) of each of the color filters 13A to 13C.

(7) The arrangement of pixels (color pixels) provided with color filters is not limited to the delta arrangement. For example, as shown in FIG. 15, a grid-like arrangement may be used. FIG. 15B is a diagram for explaining the rubbing direction (DL) of the alignment film 14 on the pixel electrode 12 side, and FIG. 15C is the rubbing direction (PL) of the alignment film 16 on the common electrode 17 side. FIG. Also in this case, the sub-pixel 66D is formed adjacent to the color pixel in a direction substantially orthogonal to the rubbing direction (DL) of the alignment film 14 on the pixel electrode 12 side in the color pixel.

(8) As shown in FIG. 16 (a), when the sub-pixel is not provided, a dark portion occurs due to the influence of the adjacent pixel among the displayed color pixels. As shown in FIG. 16B, as long as the sub-pixel 67D is provided at a position corresponding to such a darkened portion, the position where the sub-pixel 67D is formed is not limited to the embodiment. This is because by providing the sub-pixel 67D, the darkened portion of the pixel becomes brighter. In this case, a sub-pixel is provided in a portion where the pixel becomes dark regardless of the rubbing direction on the pixel electrode side.

(9) Although the liquid crystal panels 1 and 1A according to the above embodiments have been described as reflective liquid crystal panels, a transmissive liquid crystal panel may be used. The display principle of the liquid crystal panel 1 according to the above embodiment is the TN system, but is not limited to the embodiment. For example, an STN (Super Twisted Nematic) system or a vertically aligned liquid crystal may be used. The driving method of the liquid crystal panels 1 and 1A has been described as an active matrix method using TFTs, but is not limited to the embodiment as long as it is an active matrix method. For example, an active matrix method using MIM (Metal Insulated Metal) may be used.

(10) The process of holding the alignment direction of the liquid crystal molecules in a predetermined direction is not limited to the rubbing process according to the above embodiment. For example, an oblique deposition method in which silicon oxide is deposited on a glass substrate may be used.

(11) In the case of a transmissive liquid crystal panel, a liquid crystal panel (normal white type) in which the polarization axes of a pair of polarizing plates provided across the liquid crystal are orthogonal to each other may be used. A liquid crystal panel (normal black type) may be used.

(12) Although an example in which the liquid crystal panel 1 and the PBS block 33 are used in combination has been shown, the liquid crystal panel may have a polarizing plate instead of the PBS block 33.

(13) The liquid crystal panel 1 according to the above embodiment can be used for a small display device other than a projector. This is because as the liquid crystal panel 1 is miniaturized with high resolution, the pixels are also miniaturized, and the influence of the electric field by the adjacent pixels is increased. For example, as shown in FIG. 17, the upper surface display device 41 is installed on the upper surface of the camera 4, so it is necessary to make the liquid crystal panel 1 small, and it is preferable to display at a higher resolution. Therefore, the influence of the electric field by the adjacent pixels becomes large, and the present invention is suitable for the liquid crystal panel of the top display device 41. In this case, since the PBS block is not provided, the liquid crystal panel 1 includes a polarizing plate. The liquid crystal panel 1 of the present invention can also be applied to an electronic viewfinder and a head mounted display.

  It is also possible to combine one or a plurality of embodiments and modifications. It is possible to combine the modified examples in any way.

  The above description is merely an example, and the present invention is not limited to the configuration of the above embodiment.

It is a figure for demonstrating the structure of the liquid crystal panel by the 1st Embodiment of this invention. It is a figure for demonstrating a projector using the liquid crystal panel of this invention. It is a figure for demonstrating the rubbing direction of the alignment film in embodiment of this invention. It is a figure for demonstrating the pixel projected on the projection surface in embodiment of this invention. It is a figure for demonstrating the comparative example in embodiment of this invention. It is a figure for demonstrating the arrangement | sequence of a liquid crystal molecule. It is a graph showing chromaticity coordinates. It is a figure for demonstrating the liquid crystal panel apparatus in embodiment of this invention. It is a figure for demonstrating an example of the gradation of the brightness in the display of a sub pixel. It is a figure for demonstrating an example of the gradation of the brightness in the display of a sub pixel. It is a figure for demonstrating an example of the gradation of the brightness in the display of a sub pixel. It is a figure for demonstrating an example of the gradation of the brightness in the display of a sub pixel. It is a figure for demonstrating the modification of the shape of a white filter. It is a figure for demonstrating the modification of the shape of a white filter. It is a figure for demonstrating the length of the diagonal of a white filter. It is a figure for demonstrating the modification of arrangement | positioning of a pixel. It is a figure for demonstrating the modification of arrangement | positioning of a sub pixel. It is a figure for demonstrating the display apparatus using the liquid crystal panel of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Projection image 3 Projector 4 Camera 11 TFT element formation Si substrate 12 Pixel electrode 13 Color filter aggregate 13A-13C Color filter 13D White filter 14, 16 Orientation film 31 LED light source 33 PBS block 33a Polarization surface 41 Upper surface display device

Claims (19)

A liquid crystal with an orientation direction set;
A color filter having a plurality of color separation filters for separating incident light into a plurality of color components;
A plurality of white filters provided between the plurality of color separation filters;
A light amount adjusting electrode that controls the orientation of the liquid crystal and adjusts the amount of light transmitted through the color separation filter and the white filter;
A liquid crystal panel, wherein a display pixel array is constituted by a plurality of pixels corresponding to the plurality of color separation filters and a plurality of pixels corresponding to the plurality of white filters. The liquid crystal panel according to claim 1,
The liquid crystal panel, wherein the light amount adjusting electrode includes a pixel electrode provided for each of the color separation filter and the white filter and a common electrode common to the pixel electrodes. The liquid crystal panel according to claim 2,
A first alignment film that is provided on the common electrode side and that aligns the liquid crystal in a first direction; and a second alignment film that is provided on the pixel electrode side and aligns the liquid crystal in a second direction;
The liquid crystal panel, wherein the white color filter is disposed adjacent to a direction substantially orthogonal to the second direction which is a liquid crystal orientation on the second alignment film side with respect to the color separation filter. The liquid crystal panel according to claim 2,
When the white filter is not disposed, the white filter is disposed in a region where the amount of light transmitted through the pixel is decreased by a predetermined value or more due to disorder of the alignment of the liquid crystal due to a pixel signal applied to an adjacent pixel electrode. A liquid crystal panel characterized by that. 5. The liquid crystal panel according to claim 1, wherein:
The liquid crystal panel according to claim 1, wherein the color separation filter has a polygonal shape having six or more corners. 5. The liquid crystal panel according to claim 1, wherein:
The liquid crystal panel according to claim 1, wherein the white filter has a triangular or quadrangular shape. The liquid crystal panel according to any one of claims 1 to 6,
The plurality of color separation filters are delta arranged,
When the shape of the white filter is a parallelogram, and the short side of the white filter, the diagonal line, and the side of the color separation filter that is not in contact with the white filter form a rectangular shape, The length of a diagonal line is 1/2 of the length of the long side of the said rectangular shape, The liquid crystal panel characterized by the above-mentioned. The liquid crystal panel according to claim 3,
When the shape of the white filter is a quadrangle having a long side, an angle formed by the long side of the white filter and the second direction is 0 ° or an acute angle. The liquid crystal panel according to any one of claims 1 to 8,
The ratio of the total area of the white filter to the total area of the color separation filter is 20% or less. The liquid crystal panel according to any one of claims 1 to 8,
The total area of the white filter is equal to or less than the total area of each of the plurality of color separation filters. A liquid crystal panel according to any one of claims 1 to 10,
A pixel signal generation unit configured to generate a pixel signal to be applied to the light amount control electrode, and when the pixels displayed by two adjacent color separation filters sandwiching the white filter display other than black, the white filter The pixel signal is generated so that the brightness gradation of the pixel to be displayed is equal to or less than the brightness gradation value of the pixel displayed by two adjacent color separation filters with the white filter interposed therebetween. A liquid crystal panel device comprising: a pixel signal generating means for performing the operation. A liquid crystal panel according to any one of claims 1 to 10,
Pixel signal generation means for generating a pixel signal to be applied to the light amount control electrode, wherein three of the four color separation filters surrounding the white filter are color separation filters corresponding to each color component, and the four color separations When the brightness gradation value of each pixel displayed by the filter is the same, the brightness gradation value of the pixel displayed by the white filter is displayed by the four color separation filters. A liquid crystal panel device comprising: pixel signal generation means for generating the pixel signal so as to be equal to a gradation value of pixel brightness. A liquid crystal panel according to any one of claims 1 to 10,
Pixel signal generation means for generating a pixel signal to be applied to the light amount control electrode, wherein the shape of the white filter is a quadrangle having a long side, and is displayed by a color separation filter in contact with the long side of the white filter And a pixel signal generating unit configured to generate the pixel signal so that the brightness gradation value of the pixel displayed by the white filter is larger than 0 when the pixel to be displayed displays black. Liquid crystal panel device. A liquid crystal panel according to any one of claims 1 to 10,
Pixel signal generation means for generating a pixel signal to be applied to the light amount control electrode, wherein a color separation filter corresponding to a pixel displaying black is in contact with a white filter on a side substantially orthogonal to the first rubbing direction. A pixel signal generating unit that generates the pixel signal so that the brightness gradation value of the pixel displayed by the white filter is greater than zero. A liquid crystal panel according to any one of claims 1 to 10,
Pixel signal generation means for generating a pixel signal to be applied to the light amount control electrode, wherein the shape of the white filter is a quadrangle having a long side, and is displayed by a color separation filter in contact with the long side of the white filter And a pixel signal generating unit configured to generate the pixel signal so that the brightness gradation value of the pixel displayed by the white filter is 0 when the pixel to display black is displayed. Panel device.   A display device comprising the liquid crystal panel according to claim 1.   A display device comprising the liquid crystal panel device according to claim 11.   A projector comprising the liquid crystal panel according to claim 1.   A projector comprising the liquid crystal panel device according to claim 11.

Images