JPS63318587A - Liquid crystal display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a liquid crystal display device, and more particularly to a monocolor, multicolor, or full color transmissive liquid crystal display device having a backlight.

(Prior Art) Various liquid crystal display devices (LCDs) have been commercialized as pocket TVs with screen sizes of approximately 51 to 5 inches.

Most of these LCDs are backlit transmissive types that use TV liquid crystals with high contrast, and in the case of full-color LCDs in particular, the use of color filters reduces the transmittance. Since reflective LCDs cannot provide sufficient display quality, transmissive LCDs are used in most cases.

(Problems to be Solved by the Invention) However, with conventional transmissive LCDs, when external light is strong, for example when exposed to direct sunlight outdoors in midsummer,
There is a problem in that sufficient visibility cannot be obtained due to insufficient illuminance of the backlight.

The present invention was made in view of the current situation, and it is an object of the present invention to provide a liquid crystal display device that can provide sufficient visibility even when external light is strong.

[Structure of the invention]

(Means for Solving the Problems) The present invention is characterized in that a lenticular lens whose focus is aligned with the display screen is disposed on the surface of the display screen, and a light shielding layer is provided on a part of the surface.

(Function) In the liquid crystal display device according to the present invention, a lenticular lens whose focus is on the display screen is arranged on the surface of the display screen. Since the lenticular lens has the property of allowing light perpendicular to it to travel in a straight line, observation from the direction perpendicular to the display screen can be performed in the same way as without the lenticular lens.

Further, a light shielding layer is provided on a part of the surface of this lenticular lens. Therefore, by setting the position of the light shielding layer according to the incident direction of external light, external light is prevented from entering the screen, and it is possible to prevent a decrease in image visibility.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a full-color LCD driven by an active matrix using TPT, and in the figure, reference numeral 1 indicates a display screen. This display screen 1 includes a liquid crystal 2, a back side electrode 3 and a front side electrode 4 arranged on both sides of the liquid crystal 2, a back side substrate 5 arranged on the back side of the back side electrode 3, and a front side electrode 4.
It is composed of an RGB color filter 6 arranged on the front side of the color filter 6, and a front side substrate 7 arranged on the front side of the color filter 6.

A backlight 8 is arranged on the back side of the display screen 1, and by using the liquid crystal 2 as a light valve, the light of the backlight 8 is turned on and off to obtain a displayed image.

On the other hand, a lenticular lens 9 having a light shielding layer 10 provided on a part of the surface is arranged on the surface of the display screen 1, so that light from an external light source 12 can be screened without impairing the observer's 11's observation of the screen. This makes it possible to effectively block light from entering the area.

The lenticular lens 9 is, as shown in FIG.
It has a property of allowing incident light 13a perpendicular to the plane to proceed straight.

The focal point of this lenticular lens 9 is the display screen 1.
Furthermore, the pitch P of each unit lens 9a matches the pitch of the pixel in the signal line direction, making it possible to prevent image distortion caused by using the lenticular lens 9. There is. Further, the direction of the lenticular lens 9, that is, the extending direction of each unit lens 9a corresponds to the scanning line direction of the display screen 1.

As shown in FIG. 2, the light shielding layer 10
It is provided in a band shape near the upper end of the external light source 12, and its width W is set to an optimum value depending on the incident angle θ and the angular width of the incident light 13b from the external light source 12.

Next, the operation of this embodiment will be explained.

The lenticular lens 9 has a property that the light 13a perpendicular to the lenticular lens 9 travels straight. Therefore, when the observer 11 observes from a direction perpendicular to the display screen 1 as shown in FIG. 1, image visibility similar to that of a conventional LCD can be obtained. Moreover, since the pitch P of the lenticular lens 9 matches the pitch of the pixels in the signal line direction, there is no distortion of the image caused by using the lenticular lens 9.

On the other hand, since the incident light 13b from the external light source 12 has an incident angle of θ with respect to the incident light 13a perpendicular to the display screen 1, the light shielding layer 10 prevents the light from entering the display screen 1. Ru. Therefore, even if the incident light 13b from the external light source 12 is brighter than the brightness of the display screen 1, there is no risk that the visibility of the image will deteriorate.

Note that the width W and position of the light shielding layer 10 are determined by the incident angle θ and the angular width of the incident light 13b to be shielded, that is, the amplitude of the fluctuation of the incident angle θ. If the angular width of the incident light 13b is expanded, the brightness of the display screen 1 will be reduced at the same time, so it is preferable to limit the width W of the light shielding layer 10 to the necessary minimum.

With the above configuration, sufficient visibility of the display screen can be obtained even when external light is strong, such as when exposed directly to sunlight outdoors in midsummer.

-Example- As shown in FIG. 3, a lenticular lens 9 was installed on the display screen 1 of a 2-inch full-color LCD driven by an active matrix using TPT.

The lenticular lens 9 was one that focused on the display screen 1, and the lens pitch P was made to match the pitch (r-100 μm) of the pixels in the signal line direction.

The orientation of the lenses was made to match the scanning line direction of the display screen 16, and the light shielding layer 10 was provided near the upper end of each unit lens 9a, as shown in FIGS. 3 and 4.

The lenticular lens 9 was manufactured by pressing acrylic resin, and the light shielding layer 10 was formed by printing black ink. Further, the width W of the light shielding layer 10 is 20 mm from the upper end of each unit lens 9a, as shown in FIG.
The width was set to μm. And this lenticular lens 9
was adhered onto the front substrate 7 on the surface of the display screen 1 using an epoxy resin.

Using the LCD thus manufactured, an image viewing experiment was conducted with direct sunlight entering the display screen 1 from above.

As a result, it was confirmed that sufficient visibility could be obtained even under very strong direct sunlight.

It was also confirmed that there was no image distortion caused by using the lenticular lens 9.

In the above embodiment, a full-color LCD was described, but the present invention can be similarly applied to a mono-color or multi-color transmission type liquid crystal display device having a backlight, and similar effects can be expected.

〔Effect of the invention〕

As explained above, in the present invention, a lenticular lens whose focus is on the display screen is arranged on the surface of the display screen, and a light-shielding layer is provided on a part of the surface, so that the display can be viewed from a specific angle. By blocking light entering the screen, it is possible to prevent the visibility of the display screen from deteriorating due to external light.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a liquid crystal display device showing an embodiment of the present invention, Fig. 2 is an enlarged explanatory diagram of its lenticular lens, Fig. 3 is an explanatory diagram of the liquid crystal display device used in the experiment, and Fig. 4 is an explanatory diagram of the liquid crystal display device used in the experiment. It is an enlarged view of the main part of FIG. 3. DESCRIPTION OF SYMBOLS 1... Display screen, 2... Liquid crystal, 8... Backlight, 9... Lenticular lens, 9a... Unit lens, 10... Light shielding layer.

Claims (1)

[Claims] 1. In a liquid crystal display device in which a backlight is arranged on the back of a display screen using liquid crystal, a lenticular lens whose focus is on the display screen is arranged on the surface of the display screen, and each unit of the lenticular lens is arranged on the surface of the display screen. A liquid crystal display device characterized in that a light shielding layer is provided near one end of the surface of a lens. 2. In the lenticular lens, the lens pitch matches the pitch in the signal line direction of the pixels, the lens orientation matches the scanning line direction of the screen, and the light shielding layer is
The liquid crystal display device according to claim 1, wherein each lens is provided near the upper edge of the lens.