JPS6256930A - Transmission type liquid crystal display device - Google Patents

Abstract

PURPOSE:To make a sharp image display which has a wide field angle and no crosstalk among picture elements by providing a louver type light control part and microlenses which correspond to individual picture elements on the front surface of a display panel. CONSTITUTION:The light control part 9 formed by combining two louvers at right angles and microlenses 20 corresponding to individual picture elements are arranged on the front surface of the liquid crystal display panel. The light control part 9 has large directivity, but has a small angle of vision, so light is diffused by the lenses by a wide angle. Light passed through the light control part 9 is parallel, so crosstalk among the picture elements is eliminated even when the lenses have a wide angle. Thus, a sharp image display of high picture quality is made.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmissive liquid crystal display device that is capable of displaying clear images over a wide field of view.

[Conventional technology]

Conventional transmissive liquid crystal display devices have a display method in which light from a light source provided at the rear of one display panel is modulated by one display panel and then reaches the eyes of a viewer.

[Problems that the invention aims to solve]

However, with the above-mentioned technology, if the liquid crystal has h=H refractive index anisotropy or if the duty ratio of one-time division drive is increased, the effective viewing angle of the display becomes narrow because the response of the liquid crystal is limited by 6Z. , in directions other than within a certain angle, there is crosstalk between pixels! ! However, there are problems in that the contrast deteriorates, and in the case of color display, color shift or color inversion occurs, resulting in a decrease in image quality.

Therefore, the present invention aims to solve these problems.
The purpose is to provide clear image display with a wide viewing angle and no crosstalk between pixels.

[Means to solve the problem]

The transmissive liquid crystal display device of the present invention has the best operating characteristics of the liquid crystal and the best image quality by providing a light control unit such as a louver that can control light only in any direction on the front of the display panel. The entrance of the light component in the direction of clear vision is selected, and the other light is blocked.

Since the selected light has high directivity, it is characterized by using a microlens corresponding to each pixel in order to maintain a wide viewing angle, diffusing it over a wide angle, and displaying a clear image.

[Effect]

According to the above configuration of the present invention, the light control section is based on the principle as shown in FIG. 82. The omnidirectionally diffused light is restricted by the light shielding part 11, and is controlled to only the light at an angle within the angle θ between A and B. The length t of the light shielding part 11 and the opening length t at this angle θ
determined by

If t and t are set so that the angle θ is 10c' or less, the proportion of light with an angle between A and B is very small compared to the horizontal light at 0, so it is not horizontal. It is possible to control the direction of light input and output light. By continuously stacking these light shielding parts 11, a louver as shown in FIG. 1(C) can be formed, and by assembling a plurality of these louvers, the louver is provided with an angle as shown in FIG. 3. By doing so, it is possible to extract incident light having an arbitrary unidirectional component.

Since the light passing through the light control section 9 has very strong directionality and has a small viewing angle for one display, the light is selected by the microlens 10 corresponding to each pixel and is diffused over a wide range. Since the light is controlled to be almost parallel by the louvers, it is possible to diffuse the light without crosstalk.

Note that the viewing angle is determined by the curvature of the microlens 10.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention.
b1 is a side view and a front view of the display panel.

(C) It is a detailed diagram of the Fi front light control 9, and (tA is an optical path diagram.) The transmission type liquid crystal display device of the present invention will be described below with reference to the drawings.

Figure 1 (C) is displayed on the front of the conventional dot matrix display panel consisting of numbers 1 to 8 in Figure 1 (tL).
A liquid crystal display device is constructed by incorporating a louver shown in a PC, and providing a secondary light control section 9 and a microlens 10 corresponding to one individual pixel.

The light control section 9, the light shielding section 11 and the light transmitting section 1 in Fig. 1 (6)
Layer 2 in multiple layers and set the direction of the louver to 90 degrees.
The following is a combination of two louvers that are shifted by °. Due to the effect of the above-mentioned operation, the front louver of the light control unit 9 directs diagonal light in the left and right direction, and the rear louver directs diagonal light in the vertical direction.
do. As a result, it is possible to obtain a distribution of light that is almost perpendicular to the surface of the light control section 9.

Here, if the liquid crystal has the best flexibility and the viewing angle is perpendicular to the panel (jI) with good image quality, the light control section 9 can extract only the light component most effective for display. However, since this light has strong directivity, the visible angle is narrow and it is not suitable for display. Therefore, nine microlenses 10 are used to diffuse the light into a wide angle corresponding to each pixel. The first part is the optical path diagram, and A.1 to A.5.
cI.1 to mouth.3 are the optical paths of light that reach the viewer (a), ←), who is at a sufficient distance for one picture. Since the light source at the rear is diffused in all directions, there are diagonal light components as shown in C and 2, but the light control unit 9 selects only the most effective light component for displaying one image and diffuses it with a microlens of 1°. are doing. In addition, since the light passing through the light control unit 9 is approximately parallel, even when the microlens 10 is used, crosstalk 61 between pixels does not appear, and the microlens 10
(a) - (b) within the visible angle range determined by the curvature of 0
In between, it is possible to obtain a clear image display.

The material for the louver of the light control section 9 is glass.

Silicone rubber, polymethyl methacrylate, polydiethylene glycol bisallyl carbonate, polystyrene, polyvinyl chloride, cellulose butestic, b
v Plastics with excellent light transmittance, such as epoxy resin and gelatin, rubber, and glass are thinned into a film by a calendering method, an injection method, etc., and used for the light transmitting portion 12. The thickness of the light-shielding part 11 depends on the method of printing black, the method of vapor-depositing metal, etc., but in order to obtain a sufficient amount of light transmission from the entire light control part 9, the thickness should be 10 minutes compared to the thickness of the light-transmitting part 12. 1
It is important that the thickness is as follows.

The light shielding part 11 and the light transmitting part 12 are laminated in multiple layers,
By applying a compression and rolling process, the pitch is made sufficiently small compared to the pixel size to prevent image quality from deteriorating due to light interference, etc.
The louver shown in FIG. 1(b) is created by cutting perpendicular to the stacking direction.

The microlenses 10 correspond to the areas of the signal electrodes 60 that are individual pixels in FIG. 1(b), and are made of a material such as glass or plastic that has a high light transmittance ht and a high refractive index.

FIG. 3 shows another embodiment of the light control section 9. There are various angles depending on the bright viewing direction of the liquid crystal display panel, that is, the direction with the best contrast and image quality, and the characteristics of the liquid crystal.

Therefore, by incorporating a T looper at a certain angle as shown in FIG. 3, the characteristics of each liquid crystal display panel are matched. It becomes possible to select the light component in the direction most effective for display. A diagonal louver is also created in the same manner as the louver manufacturing method described above, but if the louver is cut at an angle to the stacking direction at the time of cutting, a louver with a free angle can be created.

FIGS. 4 and 5 are also diagrams showing other embodiments of the light control section 9. FIG. Fig. 4 shows a comparative example in which the light shielding part 11 has a no-nikum structure, and Fig. 5 shows a comparison in which the light shielding part 11 has a lattice shape. If the angle is set in the same manner as the above-mentioned looper and the optimum angle is taken for the characteristics of the liquid crystal, an effect hZ similar to that of the louver can be obtained.

As for the materials, the light shielding part 11 is made of a thin metal shell, and the light transmitting part 12 is made of plastic, rubber, or glass, which has a high light transmittance similar to the above-mentioned louver.

It is rather hollow.

〔Effect of the invention〕

As described above, according to the present invention, a light control section is provided in front of the liquid crystal display panel, and among the light modulated by one display panel, the input of the light component in the direction with the best image quality is selected. By setting it on the front and diffusing it with a microphone lens,
It has the effect of being able to display clear, high resolution images with no crosstalk between pixels over a wide field of view, and greatly contributes to improving the image quality of liquid crystal display devices.

In particular, the effect of using a color filter on a northern color liquid crystal display is tremendous, and a matrix type transmission type liquid crystal display has the above-mentioned effects.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the transmissive liquid crystal display device of the present invention. ((IE) is a side view, (b) is a front view, (c)
1 is a detailed view of the light control unit 9, and (d) is a cross-sectional view 1. FIG. 2 is a diagram showing the principle of the light control section 9. Figure y$3, Figure 4, and Figure fa5 are detailed diagrams showing other embodiments of the light control section 9. 1.8 ..... Deflection plate 2.7 ..... Plate glass 3 ..... Scanning electrode 4 ..... Liquid crystal sealing material 5 ..... Liquid crystal 6 ...Signal electrode 9...Light control section 10...Microlens 11...Light blocking section 12...Light transmission section ((1, (CI )... Viewer a.1~a5.Os 1~g*5.c, 2, 1.B
, c each represent an optical path. that's all

Claims (1)

[Claims] In a transmissive liquid crystal display device that includes a liquid crystal display panel in which a plurality of pixels are arranged in a matrix formed by scanning electrodes and signal electrodes, and a light source provided at the rear of the display panel, only light components in directions effective for display are selected. 1. A transmissive liquid crystal display device, characterized in that a light control section for use as a looper is provided on the front surface of the display panel, and a microlens corresponding to each pixel is provided on the front surface of the light control section.