JP2591055B2 - Chromaticity setting method of illumination light of liquid crystal display device - Google Patents

Chromaticity setting method of illumination light of liquid crystal display device

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Publication number
JP2591055B2
JP2591055B2 JP63092554A JP9255488A JP2591055B2 JP 2591055 B2 JP2591055 B2 JP 2591055B2 JP 63092554 A JP63092554 A JP 63092554A JP 9255488 A JP9255488 A JP 9255488A JP 2591055 B2 JP2591055 B2 JP 2591055B2
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Japan
Prior art keywords
chromaticity
liquid crystal
crystal display
white
display device
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JP63092554A
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Japanese (ja)
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JPH01262525A (en
Inventor
秀史 吉田
生夫 富田
文明 山田
正博 岡部
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富士通株式会社
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Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] Regarding a liquid crystal display device, a liquid crystal capable of easily displaying a bluish white, easy-to-color display, a clear white, and a desired color display can be easily obtained. For the purpose of providing a display device and a method for setting the chromaticity of illumination light, an illumination light source is incorporated outside the liquid crystal display panel, and a liquid crystal display device capable of displaying a screen having a chromaticity close to the chromaticity of the illumination light is provided. In order to set the chromaticity B 0 of the illumination light for displaying a screen of chromaticity D 0 of white or almost white, the liquid crystal display panel is
Was irradiated with white or light substantially white predetermined chromaticity B 1, we obtain the chromaticity D 1 showing the screen of a liquid crystal display device, chromaticity diagram, and B 0
B 0 is set so that the vector corresponding to the difference between B 1 and the vector corresponding to the difference between D 0 and D 1 is substantially equal.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which a screen display is, for example, bluish white which is easy to see and clear white which is easy to colorize.

The liquid crystal display device is required to have a display that is easy to see and a clear color display.
First, whether the display on the screen (background) is bluish white,
It is important to realize a liquid crystal display device that provides a clear white display. A clear color display can be realized by combining a color filter with a display device that has obtained a clear white display.

[Conventional technology]

 FIG. 4 shows the structure of a conventional liquid crystal display device.

As shown, linear transparent electrodes 3 and 4 orthogonal to each other are formed on opposing surfaces of a pair of transparent glass substrates 1 and 2 which oppose each other, and alignment films 5 and 6 are formed on the electrodes 3 and 4. Is done. These glass substrates 1 and 2
Is sealed with a sealant 7 around a predetermined space, and a liquid crystal 8 is filled in this space, and a glass substrate is provided on its outer surface with a polarizing plate 1 having a polarization direction of 90 degrees with respect to each other.
The liquid crystal display panel 9 is formed by installing 0,11. Then, an illumination light source 12 that emits white light is installed below the lower polarizing plate 10, and a liquid crystal display device is formed. Here, the liquid crystal display panel functions as a shutter for illuminating light, displays the screen of the display device in a single illumination color when the shutter is fully opened, partially closes the shutter by data input, and partially darkens the display screen. State and display the input data.

By the way, conventionally, the liquid crystal display device tends to have a greenish white display on the screen, and it has been attempted to change the display to a bluish white display which is easy to see with human eyes or a white display suitable for colorization. I have.

That is, the method of changing the thickness of the space in which the liquid crystal is sealed, that is, the cell thickness, as a method of correcting the bluish white, and the value of the refractive index anisotropy (Δn) of the liquid crystal as the method of correcting the white color
Attempts have been made to change this.

A method of adjusting the emission color of an illumination light source is disclosed in
JP-A-38930, JP-A-62-169192, and the like, there has been a demand for an adjustment method for efficiently and accurately adjusting the emission color.

[Problems to be solved by the invention]

The method of changing the parameters constituting the liquid crystal display panel, that is, the former method of obtaining a bluish white display by reducing the cell thickness has a problem that it is difficult to manufacture and green is mixed.

Further, in the latter white correction method for changing the refractive index anisotropy Δn of the liquid crystal, it is difficult to display a sufficient white color because the refractive index anisotropy of the liquid crystal has dispersion with respect to the wavelength of light. There is a certain problem.

The present invention relates to a liquid crystal display device capable of easily obtaining a display of a desired color, for example, a bluish white screen display or a clear white screen display, and a method of setting a chromaticity of illumination light. For the purpose of providing.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a liquid crystal display device in which an illumination light source is incorporated outside a liquid crystal display panel and which can display a screen having a chromaticity close to the chromaticity of the illumination light. a chromaticity setting method for setting a chromaticity B 0 of the illumination light for displaying an image in degrees D 0, the liquid crystal display panel, are irradiated with white or nearly white predetermined light chromaticity B 1 The chromaticity D 1 shown on the screen of the liquid crystal display device is obtained, and B 0 and B 1
A chromaticity setting method for illuminating light of a liquid crystal display device, wherein B 0 is set so that a vector corresponding to the difference between D 0 and D 1 is substantially equal to a vector corresponding to the difference between D 0 and D 1. I do.

(Operation)

Referring to the CIE 1931 chromaticity diagram of FIG. 2, the chromaticity coordinates B 1 [21
(X 1 , y 1 )] is the chromaticity of the white light of the illumination light source described above, and the chromaticity coordinates D 1 [22 (x 3 , y 3 )] illuminate the conventional liquid crystal display panel with the white light source. And the chromaticity of the display color of the screen of the conventional liquid crystal display device at the same time as the chromaticity of greenish white display by the panel.

Here, the liquid crystal display panel, because it is configured to allow the display color close to the display color of the illumination light, the D 1 is assumed chromaticity close to white light B 1.

In the present invention, in order to correct the display color of the screen to a desired color, for example, bluish white, an illumination light source that emits light having the following chromaticity is used. That is, the chromaticity coordinates on the chromaticity diagram of the bluish white after correction are D0 [23
(X 4 , y 4 )], this position is shifted by the magnitude and direction indicated by the vector 26 with respect to the chromaticity coordinates D 1 [22 (x 3 , y 3 )] before correction. I have a relationship.
Since the display color of the screen of such a display device depends on the color of the illumination light with respect to the liquid crystal display panel, the chromaticity coordinates B 1 [21 (x 1 , y 1 )], the chromaticity coordinates B 0 [24
(X 2 , y 2 )].

According to the illumination light source whose chromaticity is set as described above, the screen of the display device can be displayed in a desired bluish white.

Here, it is assumed that the vector 25 and the vector 26 are approximately in a parallel movement relationship. The assumption is that the four chromaticities B 0 , B 1 , D defining these vectors 25,26
0, in which D 1 is valid if it is obtained by sufficiently close on the chromaticity diagram.

Therefore, in order to solve the problem, (1) the liquid crystal display device is capable of “displaying a screen having a chromaticity close to the chromaticity of the illumination light” (hereinafter, referred to as condition 1).
(2) Desired chromaticity D to be displayed on the screen of the liquid crystal display device
0 is “white or nearly white chromaticity” (hereinafter,
Condition 2 hereinafter), (3) chromaticity B 1 of a given light source used for the chromaticity setting, "predetermined chromaticity of the white or nearly white"
(Hereinafter, referred to as condition 3).

Here, D 0 and B 1 have a chromaticity of white or substantially white under these conditions 2 and 3. Then, D 1 defined by the B 1 represents, are intended to give a condition 1 to the chromaticity of B 1 (white or substantially white), In addition, B 0 determined by these D 0, D 1, B 1, white or It has almost white chromaticity.

Therefore, by adding the restrictions as shown in the conditions 1 to 3, these four chromaticities are close to each other on the chromaticity diagram, and the two vectors 25 and 26 approximately have a parallel movement relationship. It will be.

Further, chromaticities such as “bluish white” and “greenish white” in the description in the text correspond to the chromaticity of “substantially white” here.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the apparatus of the present invention has a transparent electrode 33 made of linear indium tin oxide (ITO) formed on a pair of transparent glass substrates 31 and 32 facing each other. On the electrodes 33 and 34, alignment films 35 and 36 made of polyimide resin are formed. A predetermined gap space between these glass substrates 31 and 32 is sealed at its periphery with a sealant 37, and a nematic liquid crystal 38 is sealed in the space. Further, polarizing plates 40 and 41 having a polarization direction of 90 degrees with respect to each other are provided on both sides thereof to form a liquid crystal display panel 39, and the lower polarizing plate 40 is formed.
A light source 42 is further provided below the device, and the liquid crystal display device is completed.

As described above, although the overall structure is not different from the above-described conventional device, the present invention does not use the light source 42 as a white light source but emits illumination light matching the color according to the display color of the screen desired by the user. 42 are installed.

For example, in order to obtain a liquid crystal display device with a pale blue screen, as shown in the CIE1931 chromaticity diagram in FIG. 2 , light having a chromaticity of chromaticity coordinates 24 (x 2 = 0.2925, y 2 = 0.3090) is used. An illumination light source that emits light is used. When irradiating the back surface of the liquid crystal display panel by the illumination light source, in the shutter open state of the panel, the display panel chromaticity coordinates 23 (x 4 = 0.280, y 4 = 0.32
0) is displayed in pale blue, and the screen of the display device is also displayed in pale blue.

Here, in selecting the illumination light source, as described in the preceding section, what chromaticity is displayed when the liquid crystal display panel used in advance is illuminated by a standard white light source. Need to investigate.

In this case, the chromaticity coordinates 21 of the light from the white light source are (x 1 = 0.
3125, y 1 = 0.3290), and the chromaticity coordinates 22 of the display of the liquid crystal panel by the illuminating light are (x 3 = 0.30, y 3 = 0.34). A difference from the chromaticity is obtained, and a vector corresponding to the difference is obtained. As a result, the illumination light source is set.

FIG. 3 shows a modification of the present invention in which a liquid crystal display device having a white screen display is provided. In this example, the chromaticity of light as an illumination light source is chromaticity coordinate 52 (x 7 =
0.3250, y 7 = 0.3180), so that the display of the liquid crystal display panel (display screen) has chromaticity coordinates 53 (x 6 = 0.180).
3125, y 6 = 0.3290). In this figure, chromaticity coordinates 21 (x 1 = 0.3125, y 1 = 0.3
290) is a white light source light chromaticity, chromaticity coordinates 51 (x 5 = 0.30, y 5
= 0.34) indicates the chromaticity of the display obtained when the liquid crystal display panel is irradiated with the white light source.

As it is apparent from this figure, when the screen white display, the display chromaticity of the display panel by white light (x 5, y 5)
And the bisector on the line connecting the chromaticity (x 7 , y 7 ) of the illumination light source to be used is the white coordinate (x 1 , y 1 ).
When selecting the chromaticity of the illumination light source, the desired chromaticity can be easily known from the chromaticity diagram.

The embodiments of the present invention have been described above. However, the present invention can be modified as follows. That is, in addition to a single-layer structure, a liquid crystal display panel having a multilayer structure in which two or more panels are stacked can be used.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the color of the illumination light source is changed without changing the cell thickness and the refractive index anisotropy of the liquid crystal as parameters constituting the liquid crystal display panel. There is an effect that a desired color display can be performed.

Further, according to the present invention, the chromaticity of the illumination light source can be set efficiently and accurately by utilizing the vector on the chromaticity diagram.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal display device of the present invention, FIGS. 2 and 3 are chromaticity diagrams for explaining an example of displaying a bluish white and white screen according to the present invention, and FIG. It is sectional drawing of the liquid crystal display device of FIG. In the figure, 21, 22, 23, 24, 51, 52, 53 are color coordinates, 25, 26 are vectors, 31,
32 is a glass substrate, 33 and 34 are transparent electrodes, 35 and 36 are alignment films, 37
Denotes a sealant, 38 denotes a liquid crystal, 39 denotes a liquid crystal display panel, 40 and 41 denote polarizing plates, and 42 denotes an illumination light source.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Ikuo Tomita 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-61-38930 (JP, A) JP-A-62- 169192 (JP, A) JP-A-63-274923 (JP, A) JP-A-1-114488 (JP, A) JP-A-1-179913 (JP, A)

Claims (1)

(57) [Claims]
1. A external to the illumination light source of the liquid crystal display panel is incorporated, chromaticity screen of the liquid crystal display device capable of displaying near the chromaticity of the illumination light, displays a white or screen substantially white chromaticity D 0 a chromaticity setting method for setting a chromaticity B 0 of the illumination light to, said liquid crystal display panel, white or substantially white predetermined chromaticity B 1
Was irradiated with light, obtains the chromaticity D 1 showing the screen of the liquid crystal display device, chromaticity diagram, vector corresponding to the difference between B 0 and B 1, and D 0
B 0 is almost equal to the vector corresponding to the difference from D 1
A chromaticity setting method for illuminating light of a liquid crystal display device, comprising:
JP63092554A 1988-04-13 1988-04-13 Chromaticity setting method of illumination light of liquid crystal display device Expired - Lifetime JP2591055B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63092554A JP2591055B2 (en) 1988-04-13 1988-04-13 Chromaticity setting method of illumination light of liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63092554A JP2591055B2 (en) 1988-04-13 1988-04-13 Chromaticity setting method of illumination light of liquid crystal display device

Publications (2)

Publication Number Publication Date
JPH01262525A JPH01262525A (en) 1989-10-19
JP2591055B2 true JP2591055B2 (en) 1997-03-19

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3011161B2 (en) * 1997-10-31 2000-02-21 日本電気株式会社 Liquid Crystal Display
CN1324363C (en) * 2002-05-04 2007-07-04 三星电子株式会社 LCD device and filtering color picec array board
KR100878280B1 (en) 2002-11-20 2009-01-13 삼성전자주식회사 Liquid crystal displays using 4 color and panel for the same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6138930A (en) * 1984-04-04 1986-02-25 Citizen Watch Co Ltd Color liquid crystal display panel
JPS62169192A (en) * 1986-01-22 1987-07-25 Dainippon Printing Co Ltd Surface light source
JPS6348522A (en) * 1986-08-19 1988-03-01 Matsushita Electric Ind Co Ltd Matrix type liquid crystal display device
JPS63274923A (en) * 1987-05-07 1988-11-11 Asahi Glass Co Ltd Liquid crystal display element
JPH01114884A (en) * 1987-10-29 1989-05-08 Toshiba Corp Color liquid crystal display device
JPH01179913A (en) * 1988-01-12 1989-07-18 Stanley Electric Co Ltd Back light and color balance adjusting device for liquid crystal color display device

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