JP2000284731A - Color image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color image display device which can suppress color mixture due to parallax. SOLUTION: When receiving image data, this color image display device 11 forms an image 14 shielding a color filter 12 by an image formation part 16 according to the received image data while moving a display belt 13 in order by driving rollers 18a and 18b. When the formation of the image 14 on the display belt 13 is completed, the display belt 13 where the image 14 is formed is moved to a specific position of the color filter 12 by the driving rollers 18a and 18b. This shielding image 14 shields an area including the black matrix of the color filter 12. Here, a back light part 15 irradiates the color filter 12 from the back of the display belt 13 and then the light transmissivity of the color filter 12 of each color is modulated and additively mixed to reproduce and display an image of the color corresponding to the image data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image display device using a color filter.

[0002]

2. Description of the Related Art In recent years, large display devices using black toner, magnetic microcapsules, or leuco-based thermosensitive materials have been commercialized as monochrome information guide boards or electronic blackboards. Under such circumstances, a large-screen color image display device that performs color display by combining a large-format color filter whose manufacturing technology is remarkably progressing and the above-described display device as a means for forming an image that shields the color filter has been developed as an information guide. It is expected to be applied to boards and public notice boards.

Conventionally, as a color image display device using this type of color filter, there is a color image display device using liquid crystal. FIG. 6 is a schematic sectional view of a color image display device using a conventional liquid crystal. As shown in FIG. 6, a common electrode (ITO) for driving display on the color filter 1
In order to form the color filter 2, the color filter 1 and the liquid crystal 3 that forms an image that shields the color filter 1 are arranged in the vicinity of the common electrode 2 having a thickness of about several hundreds to several thousands angstroms. 4 and 5 are glass substrates, 6 is a scanning electrode (IT
O). For this reason, as shown in FIG. 6, when the liquid crystals 3R and 3B corresponding to the red and blue filters are in the blocking state and the liquid crystal 3G corresponding to the green filter is in the transmitting state, white light is irradiated from below and observed from the opposite side. The color image display is a green color display due to the principle of additive color mixture. However, even if the image is observed from a slightly oblique angle, the color filter 1 and the shielding liquid crystal 3 are close to each other as described in the above configuration. It doesn't look mixed.

[0004]

However, in the color image display device using the liquid crystal, since the common electrode 2 is formed on the color filter 1, the black matrix 7 is formed.
, And the liquid crystal that forms an image that blocks the color filter unit is a pixel unit of the same size.

As described above, when the color filter portion excluding the black matrix and the image that blocks the color filter unit have the same pixel unit, an image that blocks the black toner, the magnetic microcapsules, and the leuco-based thermosensitive material is formed. In such a case, a distance is generated between the color filter and an image that blocks the color filter, so that there is a problem that an unintended color is seen due to parallax when viewed obliquely.

The present invention solves the above-mentioned conventional problems, and provides a color image display device capable of improving display problems due to parallax even if there is some distance between a color filter and an image blocking the color filter. The purpose is to do.

[0007]

In order to solve this problem, a color image display device according to the present invention comprises a color filter, and an image forming means for forming an image for shielding the color filter. Is characterized in that an image is formed that blocks an area including a black matrix of a color filter in accordance with image data.

According to the above configuration, it is possible to obtain a color image display device that can suppress the influence of parallax even if the distance between the color filter and the image that blocks the color filter is small.

[0009]

According to the first aspect of the present invention, there is provided a color filter, and an image forming means for forming an image which shields the color filter, wherein the image forming means comprises a black matrix of the color filter according to image data. This is a color image display device that forms an image that shields an area including, even if the color image display device is observed slightly obliquely, the image to be shielded shields the black matrix of the adjacent color filter. Therefore, color mixing due to parallax can be prevented.

According to a second aspect of the present invention, there is provided a color filter, an image forming means for forming an image for blocking the color filter, and a backlight unit comprising a reflector, a light guide plate, and a prism for illuminating the color filter from the back. According to this configuration, transmitted light that is illuminated from the back and illuminated from the back by the backlight unit is directed to the light distribution. Therefore, color mixing due to parallax can be prevented.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a color image display device according to Embodiment 1 of the present invention, and FIG. 2 is a configuration diagram of the color filter.

As shown in FIG. 1, a color image display device 11
A color filter 12, an endless display belt 13 on which an image 14 for shielding the color filter 12 is formed, a backlight unit 15 for emitting white light from the back of the color filter 12 and the display belt 13, An image forming unit 16 for forming an image 14 to be cut off by blocking, an image erasing unit 17 for erasing the formed image, and drive rollers 18a and 18b for adjusting the display belt 13 and moving it in the direction of A in the figure. Is done.

The operation of the color image display device according to the first embodiment configured as described above will be described. When receiving the image data generated by the personal computer (not shown), the color image display device 11
Forms an image 14 for shielding the color filter 12 based on the received image data while the display belt 13 is sequentially moved by the drive rollers 18a and 18b. When the formation of the image 14 on the display belt 13 is completed, the display belt 13 on which the image 14 has been formed is driven by the driving rollers 18a and 18b.
The color filter 12 is moved to a predetermined position. This image 14 blocks an area including the black matrix of the color filter 12. Here, when white light is emitted from the back surface of the color filter 12 and the display belt 13 by the backlight unit 15, the light transmittance of each color filter is modulated and additively mixed to reproduce and display an image of a color corresponding to the image data. You.

Next, when changing the display image, the display belt 13 on which the image is formed by the driving rollers 18a and 18b is moved to the image erasing section 17, where the image is erased.
Thus, a color image display device that can be used repeatedly can be provided.

Here, as shown in FIG. 2, the pixel pitch of the color filter is P, and the black matrix width is BM. FIG. 3 shows the relationship between the size of the color filter and the black matrix and the size of the image to be shielded. FIG. 3 is a diagram showing the relationship between the size of the color filter and the black matrix and the size of the image to be shielded according to the first embodiment of the present invention.

FIG. 3A shows a case where cyan display is performed by blocking a red filter from above, a case where magenta display is performed by blocking a green filter, and a case where yellow display is performed by blocking a blue filter. 3 shows the relationship between the color filter and the image to be shielded. As can be seen from this figure, the size of the image to be shielded is P + BM.

Next, FIG. 3B shows a case where blue display is performed by blocking the red and green filters from above.
It shows the relationship between the color filter and the image to be shielded when the red display is performed by shielding the green filter and the blue filter and when the green display is performed by shielding the red filter and the blue filter. As you can see from this figure,
The size of the image to be shielded is 2 × P + B in the above two cases.
M, the lower one means that there are two P + BMs. Finally, FIG. 3C shows a case where black display is performed by blocking the red, green, and blue color filters, and the size of the blocked image is 3 × P + BM.

As described above, in the color image display device according to the first embodiment, the image that blocks the color filter blocks the region including the black matrix width based on the image data. The influence can be suppressed.

(Embodiment 2) FIG. 4 is a sectional view of a backlight portion according to Embodiment 2 of the present invention, and FIG. 5 is an orientation distribution diagram of the backlight portion. The configuration of the color image display device 1 is the same as that of the first embodiment. As shown in FIG. 4, the backlight unit 20 includes cylindrical light sources 21a and 21a.
1b, a reflector 22, a light guide 23, and a prism sheet 24.

The backlight unit 2 configured as described above
0, the cylindrical light source 21 is formed by the reflection plate 22 and the light guide 23.
a and 21b are widely distributed to form a surface light source, and the prism sheet 24 can increase the intensity in the direction normal to the plane of the backlight unit 20.

FIG. 5 shows the orientation distribution in this case.
As shown in (1), the orientation distribution on a plane perpendicular to the cylindrical light sources 21a and 21b is narrower than the orientation distribution on a horizontal plane. Therefore, in the case of a stripe-shaped color filter, if the direction of the black matrix is arranged in parallel with the cylindrical light sources 21a and 21b, the influence of color mixing due to parallax can be suppressed.

[0022]

As described above, according to the present invention, the image that blocks the color filter blocks the area including the width of the black matrix based on the image data, so that the effect of color mixing due to parallax can be suppressed. Therefore, a predetermined color image can be displayed with a wide viewing angle. Further, according to the present invention, the influence of color mixing due to parallax can be suppressed by giving directivity to the light distribution of the backlight unit, so that a predetermined color image can be displayed with a wide viewing angle.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a color image display device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a color filter according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing a relationship between the size of a color filter and a black matrix and the size of an image to be shielded according to the first embodiment of the present invention;

FIG. 4 is a cross-sectional view of a backlight unit according to Embodiment 2 of the present invention.

FIG. 5 is an orientation distribution diagram of a backlight unit according to a second embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a color image display device using a conventional liquid crystal.

[Explanation of symbols]

 Reference Signs List 11 color image display device 12 color filter 13 display belt 14 image to be shielded 15, 20 backlight unit 16 image forming unit 17 image erasing unit 18a, 18b drive roller 21a, 21b cylindrical light source 22 reflector 23 light guide 24 prism sheet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/00 336 G09F 9/00 356B 356 356E G02F 1/1335 530 F-term (Reference) 2H038 AA55 BA06 2H091 FA02Y FA34Z FA41Z LA15 LA19 5C095 BA12 BB11 BB12 CC01 CC06 DA02 EE27 5G435 AA00 AA04 BB18 CC09 CC12 DD09 DD11 EE16 EE27 FF03 FF08 GG03 GG12 GG24 GG26

Claims (2)

[Claims] 1. An image forming apparatus comprising: a color filter; and image forming means for forming an image for shielding the color filter, wherein the image forming means forms an image for shielding an area including a black matrix of the color filter in accordance with image data. A color image display device characterized by being formed. 2. A color filter, an image forming means for forming an image for blocking the color filter, and a backlight unit comprising a reflector, a light guide plate, and a prism for illuminating the color filter from a back surface thereof. A color image display device characterized in that the backlight light distribution has directivity.