JPS60159822A - Color display device - Google Patents

Abstract

PURPOSE:To make a device thin, lightweight, and to reduce power consumption by providing an optical information generating part, which generates matrix display patterns, and a color selecting part and switching these matrix display patterns and the color selecting part, which selects the light transmitted through these patterns, in time division. CONSTITUTION:The rotation angle of the plane of polarization of a polarization plane control plate 5 is set to zero to select green as the light which can be transmitted through a color selecting part 20. A matrix panel 2 is driven in time division to control the transmittance of electrooptic materials, and the light is transmitted through only picture elements corresponding to a green pattern part and a yellow pattern part of display information, and an optical information generating part 22 emits light only in the green pattern part and the yellow pattern part. The first scanning is performed, and after a certain time (t), the second scanning terminating the pattern display is performed. The rotation angle of the polarization plane control plate 5 is set to about 90 deg. to select red as the light which can be transmitted through the color selecting part 20. Synchronously with this setting, scanning of the matrix panel 2 is started, and the matrix panel is driven and controlled so that only picture elements of the optical information generating part corresponding to a red pattern part and the yellow pattern part of display information emit light.

Description

[Detailed description of the invention] [Industrial application field] The present invention is composed of an optical information generating section and a color selecting section.

This invention relates to improvements in color display devices.

[The amount of invention]

Color mixing methods for color display include a juxtaposition color mixing method and a time color mixing method. The juxtaposed color mixing method obtains color mixing by arranging red display pixels, green display pixels, and blue display pixels as close to each other in a plane as approximately 14 spatial powers of the human eye. The temporal color mixing method performs color mixing by switching the display color of one pixel at a time period that is less than the temporal resolution of the human eye. The temporal color mixing method has a rib with a higher display resolution than the juxtaposed color mixing method.

This is due to the fact that in the juxtaposed color mixing method, one pixel consists of three pixels: red, green, and white, but in the temporal color mixing method, it consists of l i + iu elements. As the amount of displayed information increases, higher resolution is essential, and the one-hour color mixing method is likely to be effective.

[Conventional technology and problems]

As a conventional example of the time color mixing method, CI(i' is used L・ta)L
There is a three-color color display device comprising an information generating section, and a color selecting section composed of a color polarizing plate and a 1/2 wavelength diagonal liquid crystal plate. (SiD83DiGES'l' P28) In this conventional example, the display resolution is a high resolution of 34 tones using the juxtaposed color mixing method, but since the optical information generating section is
It has several drawbacks such as depth, weight, power consumption, etc.

[Purpose of the invention]

It is an object of the present invention to provide a color display device which eliminates the above-mentioned drawbacks.

[Structure of the invention]

Generate a turn in the matrix display. The color selection section and color selection section are switched on a time-sharing basis to display the color display.

This will be described in detail below using drawings.

[Embodiments of the invention]

(Example 1) FIG. 1 shows the structure of a three-color display device θ) of this example. 1 is a light source, 2 is a square panel, 6&'1 is a red color polarizing plate, 4 is a green color polarizing plate, 5 (i polarization plane control plate, 6 is a linear polarizing plate - (there is. i1+
i! The ti control board 5 has a completely transparent 1L output type I.
Jk size, Δ(L-row oriented nematic liquid crystal layer for two-frequency drive, 1 (liquid crystal with reversed vector tilt angle) ζ lance effect reduced - [j7 B, π cell with smaller valley (S i D83 P 30), liquid crystal layers such as 'I''N liquid crystal layer, and transparent stamps on both sides (P L
The ZT element has a function of controlling the polarization plane rotation angle to two values of zero II and 90 degrees. Color polarization 4 anti-6° 4 arrow and letter 1 (, Q-W indicates the polarization direction of the light and the color of the transmitted light after passing through the color polarizing plate -4-, ILI': l, red, G is green, and W is white. 70'l is the scanning 111 metriver circuit section, 8 is the signal electrode dry path section, 9 is the polarization plane 111j, and the circuit name is 1 (:l
IT - There is a control circuit j<B that controls these drivers.

1 and 2 are optical information generating sections 22, and 3, 3.4.5.6 are color selection sections 20. 1) A passive panel with an electro-optical material arranged at the intersection of the horizontal scanning electrode and the vertical signal electrode, It may be an active type panel in which a transistor or diode is formed for each pixel to control the electro-optical material of one pixel.

The electro-optical material has high-speed response, such as a nematic liquid crystal containing a chiral substance that exhibits a phase transition scattering mode, a chiral smectic ferroelectric liquid crystal, and a PLZT element.

The operating principle of this embodiment is as follows. First, by setting the rotation angle of the polarization plane of the polarization plane controller 5 to zero, the light that can be transmitted through the one color selection section 20 is set to green.

The matrix panel 2 is driven in a time-division manner to control the transmittance of the electro-optic material, so that only the pixels corresponding to the green pattern part and the yellow pattern part of the display information transmit light. The source is only the green pattern part and the amber pattern part.The scanning of the matrix panel is performed by adding the first line to the scanning line.
A second scan starts pattern display by performing a scan of
Let's perform a scan. A second scan is performed on the last scan electrode of the matrix panel 2 after a certain period of time after the end of the first scan, and the output of the optical information generating section is made almost zero. The second scan is an erase scan, which is not necessary if the electro-optic material has a quick response. Next, the rotation angle of the polarization self-control plate 5 is set to approximately 90 degrees to make the light that can pass through the color selection section 20 red. In synchronization with this, Matrix Panel 2
It corresponds to the red pattern part and yellow pattern part of the display information, including the scanning of the display information. After a certain period of time has elapsed after the scanning electrodes are scanned, the output of the optical 'l'i'j signal generation NX15 becomes almost zero.The above steps are repeated once.

When a red polarizing plate and a blue polarizing plate are used, red, magenta, and blue display are n1 mode, and when a blue polarizing plate and a green polarizing plate are used, blue, magenta, and green display are 0'' function. Furthermore, by performing gradation control in the optical information generating section 22, any of the two colors of the color polarizing plate can be displayed.

(Example 2) FIG. 2 shows a seven-color color table showing the configuration of the apparatus. 1 is a light source,
2 is a matrix panel, 11 is 1! i' color 11uj light 4, 12 is the first polarization control plate, 13 is the green polarizing plate,
14 is a polarization control plate for the skin 2, and 15 is a red polarizing plate.

In this embodiment, 1.2 is the optical information generating section 24.11 to 15.
is the color selection section 26. Mado 11 Kusuba Anru 2, 1st,
Although not shown in the figure, the second polarization plane control plate is connected with a drive circuit jηb and a control circuit section that controls the drive circuit section in the same way as in FIG. It's tori.

First, the case of red selection is shown in FIG. 3(a), where the straight arrow on the polarization plane control plate indicates that the rotation angle of the polarization plane is almost zero.

The circular arrow means that the rotation angle of the plane of polarization is approximately 90 degrees. The rotation angle of the polarization plane control Fi12 of W21 is approximately zero, and the rotation angle of the second polarization plane control plate 140 is approximately 90 degrees. The light that has passed through the old color polarizing plate 11 enters the green polarizing plate 16 without being rotated by the first polarization control plate 12. When emitted, the blue side light is absorbed, and only white light is polarized perpendicular to the plane of the paper. This white light can be rotated by 90 degrees with the second polarization control plate 14, and when emitted from the red polarizer, it is polarized parallel to the plane of the paper. Only polarized red light is emitted. The green transmission is shown in FIG. 3(1)l and the blue transmission is shown in FIG. 3FC), respectively.

As in the first embodiment, seven colors can be displayed and gradation control can be performed by controlling the output back of the optical information generating section 24 in temporal synchronization with the selected color of the color selecting section 26. It is possible to display all colors. In FIG. 2, the insertion positions of the polarizing plates for each color are interchanged with each other. It is also a good practice to arrange the polarization direction of each color polarizing plate to be rotatable by 90 degrees for each telegraph U plate. However, in response to these changes, the polarization control plate 7! Needless to say, the I4 jtjl operation will be changed.

[Example] In 2, the flat light source is composed of an EL lamp, a fluorescent lamp, a diffuser plate, etc. The emission spectrum may be a method in which the emission values are almost equal in the viewing range, but it may be a method that emits light with three wavelengths: red, green, and evening. A mold is preferable.

〔Effect of the invention〕

A color display device using the temporal color mixing method can be realized with a thin design, paper size, and low power consumption.

[Brief explanation of the drawing]

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. FIG. 3 is a schematic diagram illustrating the operating principle of the color selection section of the second embodiment. 2... Matrix panel, 6.4.11.13.15... Color polarizing plate. 5.12.14...Polarization control plate. 22.24... Optical information generation section, 20.26... Color selection section. Figure 2 Figure 3 (a) (b) (C)

Claims (3)

[Claims] (1) A matrix panel having a scanning electrode, an optical information generating section that generates a matrix display pattern, and a color selection section that selects the matrix display pattern and the light transmitted through the matrix display pattern. A color display device characterized by displaying colors by switching in time division. (2) The scanning electrodes of the matrix panel display a pattern in the first scan, and after a certain period of time after the first scan,
A color according to claim 1, characterized in that a second scan is performed to end the pattern display of the scan electrodes, and the transmitted color of the color selection section is changed after the second scan of the final scan electrodes is completed. Display device. (3) The color selection section is characterized in that a polarization plane control plate for controlling the rotation angle of the polarization plane of light is disposed between two gaps between three types of color polarizing plates arranged in a stacked manner. A color display device according to scope 1.