JPS60194426A - Multicolor display device - Google Patents

Abstract

PURPOSE:To attain display of natural color by constituting a color switch of three polarizing filter and two liquid crystal light shutters arranged between these filters. CONSTITUTION:Two optional multicolor polarizing plates are used out of the combination of Cy/R, Mz/G and Ye/B, and in the figure, the combination of Cy/R and Ye/B is used. Passing colors corresponding to the combination of the ON/OFF of liquid crystal light switches LC1, LC2 are shown in a table, and when both the switches LC1, LC2 are ON, the passing color is green G which is a residual color obtained by transmitting light through white W, cyane Cy and yellow Ye polarizing axes of the polarizing plates P1-P3 and synthesizing these colors. Thus, the three primary colors, i.e. read R, blue B and green G, for the mixute of all colors are expressed on the basis of the combination of ON/OFF of the switches LC1, LC2 and real natural color display can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for realizing natural color display using a monochrome light-emitting display device such as a cathode ray tube (CRT) without a shadow mask.

[Background of the invention]

As the information society becomes more sophisticated, display devices used as information terminals are required to have increasingly high resolution and natural colors. The currently most excellent color display device is a shadow mask type CRT, but the presence of the shadow mask is becoming an obstacle in terms of resolution, power consumption, and brightness. Non-shido mask type C
The beam index type is a typical RT, but it has not been put to practical use because its advantages cannot be fully exploited in terms of structure and processing method. Other methods of non-shadow mask type include liquid crystal shutter and CRT from Tektronix.
A method combining the two has been proposed.

However, only colors between red and green are displayed instead of natural colors. The present invention provides a display device capable of displaying natural colors. This will be explained below based on the drawings.

FIG. 1 shows a conventional example. The first polarizing plate P is placed in front of the CRT.
1. Liquid crystal optical switch LC1 A color switch consisting of a second polarizing plate P2 is arranged.

The circle shown below indicates the transmission polarization axis of the polarizing plate.

The first polarizing plate P1 is a so-called black and white polarizing plate, and the vertical direction of the drawing is, for example, the first polarizing axis, and the direction orthogonal to that is the second polarizing axis.
The arrow W in the circle indicates that the light of the first polarization axis is transmitted as white W regardless of the wavelength.

On the other hand, the second polarizing plate P2 is a so-called bichromatic polarizing plate, and the second polarizing plate P2 is
The light with the second polarization axis transmits the red color R, and the light with the second polarization axis transmits the green color G. In the liquid crystal optical switch LC, two substrates 1.6 on which transparent electrodes 4 and B are formed are formed into a cell by a sealing part 2, and a liquid crystal 5 is sealed inside. The liquid crystal has a twisted nematic structure, and the polarization axis can be passed through or rotated by 90 degrees depending on whether the voltage between the electrodes is turned on or off.

Therefore, depending on whether the liquid crystal optical switch LC is turned on or off, the first
The white light selected by the polarizing plate P1 is transferred to the red R of the second polarizing plate.
1 It is possible to select which polarization axis of green G corresponds to, and selective display of red/green is possible.

It is not possible to display red to green on the same screen at the same time, but by switching the display of red and green at a certain rate of rapidity, the human eye will see the colors mixed over time and the colors will appear from red to green on the same screen at the same time. Any color of green will be displayed.

[Disadvantages of conventional technology]

The above conventional examples are very good, but the drawback is that the color range is limited.

[Purpose of the invention]

The present invention overcomes this drawback.

[Structure of the invention]

This is achieved by a combination of two liquid crystal switches and three polarizing filters. One of the three polarizing filters is a black and white polarizing plate, and the other two are bicolor polarizing plates. This multicolor polarizing plate of the present invention is also different from the conventional example. In the conventional example shown in FIG. 1, a multicolor polarizing plate is used in which an arbitrary combination of the three additive primary colors red, R, green, and blue B is used. However, with the configuration of the present invention, such a bichromatic polarizing plate has no effect.

In the present invention, the following two types of bicolor polarizing plates are used.

In the first method, unlike the conventional example, the transmitted light of the first polarization axis is an arbitrary primary color among the three subtractive primary colors cyan Cy, magenta M z , and yellow Ye, and the transmitted light of the second polarization axis is Red R among the three additive primary colors that are complementary colors
1 green G1 blue B. That is, CylR type, M
There are three types: z/G type and Ye/B type. Second
As a method, both the transmitted light of the first and second polarization axes are of different primary colors among the three subtractive color mixture primary colors, and Cy / M
There are three types: z type, Mz/Ye type, and Ye/Cy type. In the present invention, a total of six types of double-color polarizing plates of these two types are used. Incidentally, these bicolor polarizing plates can be easily formed in the same way as conventional bicolor polarizing plates. That is, Cy, Mz,
A monochromatic polarizing plate is made by dyeing with a dichroic dye of a color such as Ye, and a desired bichromatic polarizing plate is obtained by bonding two types of monochromatic polarizing plates with their polarization axes orthogonal to each other.

〔Example〕

FIG. 2 shows three embodiments of the multicolor display device of the present invention.

A color switch provided in front of a light-emitting display device such as a CRT is composed of three polarizing plates P1, P2, and P6 and two liquid crystal optical switches LC1 and LC2. The first polarizing plate is a black and white polarizing plate in all three embodiments, and the second and third polarizing plates are selected from among the two systems and six types of multicolor polarizing plates described above.

[Example A]

Three types of the first method as bicolor polarizing plates: Cy/R1Mz/
This uses any two of G and Ye/B. In this embodiment, Cy/R, , Ye/B are used. The explanatory diagrams shown in Fig. 2 (A) (i) and (11) show the operation.
It shows which color of light is transmitted for the 0N10FF combination of two liquid crystal optical switches LC1 and LC2.

For example, when both LCl and L C2 are ON, the transmitted light is white W and cyan Cy of the three polarizing plates P1, P2, and P6, respectively.
.

It passes through the polarization axis of yellow Ye, and the remaining color is green G. In this way, 0N10F of L C1 and L C2
The three primary colors of all additive color mixtures in combination of F are red R6 blue B,
It is possible to produce green G, and by using the present invention, true natural color display becomes possible. Other combinations of double polarizer Cy/R and Mz/G or Mz/G and Ye/B
However, the same effect can be obtained by simply changing the combination of 0N10FF.

[Example B] One bichromatic polarizing plate of the first method and one of the second method are used. In Figure 2 (B), Y e / B and C
Although the combination of y/Mz was used, Cy/R and Mz
The same applies to the combinations of /Ye, Mz/G and Ye/Cy. In this example as well, all three primary colors R, G, and B can be obtained through additive color mixing, and natural colors can be displayed.

[Example C] Two types of bichromatic polarizing plates of the second type are used.

In Figure 2 (C), Cy / M z and Y e / Cy
However, the combination of M z / Y e and Y e / C
y, Cy/Mz and Mz/Ye, all three primary colors R1G and B of additive color mixing can be obtained.

〔Effect of the invention〕

All of the above three embodiments are capable of displaying three primary colors by additive color mixing, and displaying natural colors by time mixing.

Furthermore, if the entire surface is to be illuminated at the same time, it is also possible to produce intermediate colors by setting the voltage of the liquid crystal light shutters L C1 and L C2 to an intermediate voltage instead of ON10FF. For example, in Example A, T
, CI is set to ON and T is set, C2 is set to OFF and then set to O.
When changed to N, intermediate colors from blue B to green G can be displayed.
By turning L C2 ON and changing LCl from OFF to ON, it is possible to display from red R to green G.

Also, when comparing the three embodiments A, B, and C, the three primary colors R, G
, B have different colors that can be displayed.

In (A), black BL, in (B), additive color mixture 3 primary colors R1G,
One of H (B in the example in Figure 2 (B)), and one of the three subtractive primary colors Cy, Mz, and YeO in C (Figure 2 (C)
(Cy) can be displayed only with the combination of ON10FF. Among these, the ability to display black in Example A is convenient because the brightness can be controlled independently of the light-emitting display device. For example, in time color mixing, the overall brightness can be modulated by adding the phase of black and changing its time.

In the above embodiments, the black-and-white polarizing plate was always placed on the side of the light-emitting display device, but the effect remains the same no matter how the order of the one black-and-white polarizing plate and the two bicolor polarizing plates is changed.

As described above, by using the present invention, it is possible not only to display natural colors without a shadow mask, but also to enable high-density display, which was conventionally limited by the pinch of holes in the shadow mask.
Energy transmittance of 40~ compared to 15% of shadow mask
45% of the light energy can be used, allowing bright display with low power consumption.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional multicolor display device using a liquid crystal light shutter and a cathode ray tube, and FIG. 2 is a sectional view of a natural color display device according to the present invention. , FIG. 2(D) is a sectional view, FIG. 2(A),(B)
) and (C) are explanatory diagrams showing transmitted light depending on the polarization direction. CR, T...Cathode ray tube, L C, L C1, L
C2...Liquid crystal light shutter, pi, l)2, P
6...Polarizing filter, R,, G, B...3 additive primary colors, Cy, Mz, Yc-3 subtractive primary colors, W...white, B L... ··black. Figure 2 (D)

Claims (7)

[Claims] (1) A multi-color display device that is equipped with a color switch that modulates the transmitted color on the front of the light-emitting display device, and can change the displayed color by synchronizing the light-emitting display device and the color switch. In this case, the color switch consists of three polarizing filters and two polarizing filters installed between the polarizing filters.
A multicolor display device characterized by consisting of two liquid crystal light shutters. (2) Among the three polarizing filters, one of them is a black and white polarizing plate, and the other two have the transmitted color of the first polarizing axis,
2. The multicolor display device according to claim 1, wherein the multicolor display device is a multicolor polarizing plate in which the transmitted colors of the second polarization axes are different from each other. (3) Claims characterized in that in at least one of the two multicolor polarizing plates, the transmitted color of the first polarizing axis and the transmitted color of the second polarizing axis are complementary colors to each other. 2. The multicolor display device according to item 2. (4) In one multicolor polarizing plate, the transmitted color of the first polarizing axis is the first primary color, which is one of the three subtractive primary colors, and the transmitted color of the second polarizing axis is the first primary color, which is one of the three subtractive primary colors. The color transmitted by the other bicolor polarizing plate is a complementary color, and the transmitted color of the first polarization axis is a second primary color that is one of the other three subtractive primary colors, and the transmitted color of the second polarization axis is 4. The multicolor display device according to claim 3, wherein the color is complementary to the second primary color. (5) At least one complementary color polarizing plate among the two multicolor polarizing plates has a first polarizing axis in which the transmitted color is a first primary color that is one of the three subtractive primary colors, and a second polarizing axis 3. The multicolor display device according to claim 2, wherein the transmitted color is the other second primary color of the three subtractive mixed primary colors. (6) In one multicolor polarizing plate, the transmitted color on the first polarization axis is the first primary color, which is one of the three subtractive primary colors, and the transmitted color on the second polarization axis is one of the three subtractive primary colors. another second primary color,
The transmitted color of the first polarizing axis of the other multicolor polarizing plate is the other third primary color of the subtractive color mixture three primary colors, and the transmitted color of the second polarizing axis is the complementary color of the third primary color. A multicolor display device according to claim 5, characterized in that: (7) In one multicolor polarizing plate, the transmitted color on the first polarization axis is the first primary color, which is one of the three subtractive primary colors, and the transmitted color on the second polarization axis is the first primary color, which is one of the three subtractive primary colors. another second primary color,
The transmitted color of the first polarizing axis of the other multicolor polarizing plate is the other third primary color of the subtractive color mixture three primary colors, and the transmitted color of the second polarizing axis is the first or second primary color. A multicolor display device according to claim 5, characterized in that: