JPS61239213A - Color display device - Google Patents

Abstract

PURPOSE:To generate monochrome and halftone of high resolution by controlling an optical information generating part so that the direction of polarization of the output light of the optical information generating part is approximately parallel with that of polarization on the incidence side of a selected color of a color selecting part. CONSTITUTION:The optical information generating part is constituted with a light source 1 and a matrix panel 2. The matrix panel 2 consists of scanning electrodes in the horizontal direction, signal electrodes in the vertical direction, and electrooptic materials at intersections between them. A red color polarizing plate 3 whose red transmission direction is vertical and a green color polarizing plate 4 whose green transmission direction is horizontal are provided between the matrix panel 2 and a polarization plane control plate 5. The direction of polarization of the polarization plane control plate 5 is controlled through a polarization plane control driver circuit 9 by the signal of a control circuit 10, and scanning of the matrix panel 2 is started synchronously with this control to output green and red alternately to a linearly polarizing plate 6. The time of one period is set within the after image duration of human eyes, and gradation is controlled by the optical information generating part. Thus, colors including halftone are displayed with a high resolution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a time color mixing type color table device comprising a color selection section, an optical information generation section using an IJ panel.

[Conventional technology]

Color mixing methods for color display devices include a juxtaposition color mixing method and a time color mixing method. The juxtaposition color mixing method uses red display pixels, green display pixels,
By arranging the blue display pixels as close to each other as the spatial resolution of the human eye, color mixture is obtained. On the other hand, the temporal color mixing method performs color mixing by switching the display color of one pixel at a time period less than the temporal resolution of the human eye.

The display resolution of the temporal color mixing method is three times that of the juxtaposed color mixing method. This is because in the juxtaposed color mixing method, one pixel consists of three pixels of red, green, and blue, but in the temporal color mixing method, one pixel consists of one pixel. As the amount of display information increases, higher resolution is essential, and the temporal color mixing method is an effective means.

[Problem that the invention seeks to solve]

As a conventional example of the temporal color mixing method, there is a three-color color display device consisting of an optical information generating section using a CRT, and a color selection section composed of a color polarizing plate and a 1/2 wavelength retardation liquid crystal plate. (S
iD83 DiGESTP28) In this conventional example,
Since the optical information generating section is a CRT, it has drawbacks such as being relatively deep, relatively heavy, and having high power consumption.

The present invention provides a high quality color display device by employing a new structure of a time color mixing method color display device using a matrix panel.

[Means for solving problems]

The present invention is characterized in that, at the output stage of the optical information generation section, the polarization direction of light of a meaningful display pattern is set corresponding to the polarization direction of the colors selected by the five-color selection section.

〔Example〕

A first embodiment of the time color mixing method color display device of the present invention is described below.
The four-color display shown in Figures 2 and 3 is shown in Figure 1.
The 8-color display will be explained with reference to FIGS. 2 and 3.

(Example 1) FIG. 1 shows the configuration of a three-color display time color mixing type color display device.

1 is a light source, 2 is a matrix panel, 3 is a red color polarizing plate, 4 is a green color polarizing plate, 5 is a polarization plane control plate, and 6 is a linear polarizing plate. The polarization plane control plate 5 includes a parallel-aligned nematic liquid crystal for driving 02 scrap waves formed using transparent electrodes on the entire surface, and a π cell (5iD83. P2O)
, a liquid crystal layer such as a TN liquid crystal layer, a PLZT element in which transparent electrodes are formed on the entire surface of both sides, etc., have the function of controlling the polarization plane rotation angle to two values of 0 degrees and 90 degrees.

The arrows and letters R, G, W on the color polarizing plate 3.4 indicate the polarization direction of the light after passing through the color polarizing plate and the color of the transmitted light. R is red, G is green, and W is white.

7 is a scanning electrode driver circuit section, 8 is a signal electrode driver circuit section, 9 is a polarization control plate driver circuit section, and 10 is a control circuit section for controlling these drivers. 1 and 2
is the optical information generating section. 3.4.5.6 is a color selection section. A matrix panel is a passive type panel consisting of a horizontal scanning electrode, a vertical signal electrode, and an electro-optic material placed at the intersection of the two, or a passive panel that has a transistor or diode formed for each pixel to control the pixel's electricity. Either active type panel that controls optical substances may be used. The electro-optical material is chiral smectic ferroelectric liquid crystal, PLZT.
The element has high-speed response. First, the polarization plane rotation angle of the polarization plane control plate 5 is set to zero, and the light that can be transmitted through the color selection section is set to green.

Note that the polarization direction of the green transmitted light is horizontal. The matrix panel 2 is driven in a time-division manner to control the transmittance of the electro-optic material, and only pixels corresponding to the pattern portion containing the green component of the display pattern of the color display device emit light having a plane of polarization in the horizontal direction. . Next, polarization control plate 5
The zero rotation angle is set to approximately 90 degrees, and the light that can pass through the color selection section is red. At this time, it should be noted that the polarization direction of the transmitted red light is vertical. In synchronization with the change in the rotation angle of the polarization control plate 5, scanning of the IJ panel 2 is started, and only the pixels corresponding to the pattern containing the red component of the display pattern of the color display device receive light having a vertical polarization plane. Drive to emit light.

The above is regarded as one cycle, and the time of one cycle is set to a value approximately equal to the temporal resolution of the human eye, and the process is repeated.

Regarding the colors of the polarizing plates used, red, magenta, and blue can be displayed by using a red polarizing plate and a blue polarizing plate, and blue, cyan, and line display can be performed by using a blue polarizing plate and a green polarizing plate. becomes. Furthermore, by performing gradation control in the optical information generating section, it is possible to display any color between the two colors of the color polarizing plate. Further, the color polarization axes of the two types of color polarizing plates only need to be substantially orthogonal to each other, and there is no need to be particular about horizontal or vertical orientation.

However, the polarization axis of the linear polarizing plate 6 must be approximately parallel to one of the two color polarization axes.

(Example 2) FIG. 2 shows the configuration of an eight-color color display device. 1 is a light source,
2 is an IJ panel, 11 is a blue polarizing plate, 12 is a first polarization control plate, 13 is a green polarization plate, 14 is a second polarization control plate, and 15 is a red polarization plate. In this embodiment, 1.2 is an optical information generating section, and 11 to 15 are color selecting sections. Although not shown in the figure, a drive circuit section and a control circuit section for controlling the drive circuit section are connected to the matrix panel 2, the first and second polarization control plates, as in FIG. 1. The method of controlling the color selection section is as follows.

First, the case of red selection is shown in FIG. 3(a). A straight arrow on the polarization plane control plate means that the rotation angle of the polarization plane is approximately zero, and a circular arrow means that the rotation angle of the polarization plane is approximately 90 degrees.

The rotation angle of the first polarization control plate 120 is approximately zero, and the rotation angle of the second polarization control plate 14 is approximately 90 degrees. The light transmitted through the blue polarizing plate enters the green polarizing plate 13 without being rotated by the first polarization control plate 12 . When emitted, the blue polarized light is absorbed, leaving only white polarized light perpendicular to the plane of the paper. This white light is rotated by 90 degrees by the second polarization plane control plate 16, and when emitted from the red polarizing plate, only red light polarized parallel to the plane of the paper is emitted. Green transmission is shown in FIG. 3(b), and blue transmission is shown in FIG. 3(C). As in Example 1, in time synchronization with the color selected by the color selection section, the pixels of the optical information generation section 2 emit horizontally polarized light when the color selection section selects red; When selected, horizontally polarized light is emitted, and when blue is selected, vertically polarized light is emitted. By doing this, eight colors can be displayed, and by performing gradation control, it is possible to display all colors.

In FIG. 2, the insertion positions of the polarizing plates for each color can be replaced with each other. Further, the polarization direction of each color polarizing plate may be rotated by 90 degrees and arranged.

However, in response to these changes, the polarization control plate 12.14
Needless to say, the drive operation of the engine must be changed.

In Example 1.2, the plane light source 1 is composed of an EL, a fluorescent lamp, a diffuser plate, and the like. Although the emission spectrum may be a system in which the emission values are approximately equal in the visible range, a three-wavelength emission type of red, green, and blue is preferable.

〔Effect of the invention〕

As described above, the present invention provides a temporal color mixing color display device with high display resolution by setting the polarization direction of the output light of the optical information generating section to correspond to the polarization direction of the selected color of the color selection section. Realize.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram showing the configuration of Example 2 of the present invention. FIG. 3 is an explanatory diagram showing the operating principle of the color selection section according to the second embodiment of the present invention. 2... Matrix panel, 3.4, 11, 13
．． 15...Color polarizing plate, 5.12.14...
...Polarization control plate.

Claims (1)

[Claims] It consists of a light source and a matrix panel, an optical information generating section that generates a display pattern, a polarization plane control plate that controls the rotation angle of the polarization plane, a color polarizing plate, and a color selection section that selects the transmitted color. In a color display device that performs temporal color mixing by driving the information generating section and the color selecting section in temporal synchronization, the polarization direction of the output light of the optical information generating section can be changed by
A color display device characterized in that an optical information generating section is controlled so that the polarization direction of the selected color of the color selecting section is substantially parallel to the incident side polarization direction.