JPH0493922A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To eliminate the crosstalk of an optical fiber plate and to improve the quality of a displayed picture by arranging the optical fiber plate having a jacket part to which light shield processing is performed on the emitting side of a liquid crystal panel. CONSTITUTION:Light L from a light source is made incident in the liquid crystal panel 10 from a polarizing filter 31 on an incident side and the light L emitted from the panel 10 is made incident in the optical fiber plate 40 through a color filter 20 and a polarizing filter 32 on the emitting side. Since the light shield processing is performed to the plate 40 so as not to cause the crosstalk among the constituent optical fibers 41 and ground glass surface processing is performed to the emitting end face 411, non-directional light is emitted. Therefore, the high-quality picture without the change of contrast caused by a visual angle and blotting is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display device that displays an image on a display by changing liquid crystal according to an input video signal, and particularly relates to an optical fiber on the exit side of a liquid crystal panel. The present invention relates to a liquid crystal display device in which light from a light source is guided through a plate only in the thickness direction.

[Prior Art] A conventional example of this type of liquid crystal display device is shown in FIG. 4.

The liquid crystal display device shown in FIG.
a liquid crystal panel 10 in which a liquid crystal 13 is sealed between a glass substrate 11 on the entrance side on which a color filter 20 is attached to a glass substrate 12 on the exit side of the liquid crystal panel 10;
It has an optical fiber plate 40 provided on the exit side, and a pair of entrance side and exit side polarizing filters 31 and 32 installed on the entrance side and exit side of the liquid crystal panel 10 so that the polarization directions are perpendicular to each other.

The arrangement of the liquid crystal (twisted nematic type liquid crystal is used for boat fishing) changes depending on the video signal input between the common electrode 121 and the drive electrode 111, which is called a shutter effect, which allows the light from the light source to pass through. control and display images.

[Intelligence B to be Solved by the Invention] However, in the above-mentioned liquid crystal display device, there is crosstalk between the optical fiber plates (leakage between the optical fibers that make up the optical fiber plate), so the displayed image There is a problem with quality deterioration.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a liquid crystal panel in which liquid crystal is sealed between an exit-side glass substrate and an entrance-side glass substrate, and a liquid crystal panel on the entrance side of the liquid crystal panel. and an optical fiber plate configured to guide the light source light only in the thickness direction provided on the exit side of the liquid crystal panel; The optical fiber plate is characterized in that each of the outer cover portions of the optical fibers constituting the optical fiber plate is shielded from light.

[Function] The light source light emitted from the light source is incident on the liquid crystal panel via the incident side polarizing filter. The light source light emitted from the liquid crystal panel is incident on the optical fiber plate via the color filter and the exit-side polarizing filter. Since the exit end face of the optical fiber plate is treated with a brushed glass surface, non-directional light is emitted.

[Embodiment] Next, an embodiment of the liquid crystal display device according to the present invention will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 is a sectional view showing a schematic configuration of a liquid crystal display device according to the present invention.

The liquid crystal display device shown in FIG.
A liquid crystal panel 10 having a liquid crystal 13 sealed between the liquid crystal panel 10 and an exit glass substrate 12, a pair of entrance side and exit side polarizing filters 3132 installed on the entrance side and the exit side of the liquid crystal panel 10, and the liquid crystal panel 10. It has an optical fiber plate 40 provided on the exit side of the panel.

The liquid crystal panel 10 is composed of a transparent incident-side glass substrate 11 and an exit-side glass substrate 12, and a liquid crystal 13 sealed between both glass substrates I1.12.

On the inside of the incident-side glass substrate 11, a drive electrode 111 corresponding to the pixel 21 is a transparent conductor! (For example, ITO, etc.). An incident side polarizing filter 31 is attached to the outside of the incident side glass substrate 11 of this liquid crystal panel 10 . Furthermore, color filters 20 are attached to the outside of the exit-side glass substrate 12, respectively. The color filter 2
0 is one in which a large number of pixels 21 of each of the three primary colors R, G, and B are formed. On the outside of the color filter 20, an exit side polarizing filter 32 that deflects the light source light in a direction perpendicular to the polarization direction of the input side polarizing filter 31 is closely attached.

An optical fiber plate 40 shown in FIG. 2 is closely attached to the outside of the exit-side polarizing filter 32. The optical fiber plate 40 is formed on a plate by cutting an optical fiber cable which is a bundle of a plurality of optical fibers 41 whose jackets are subjected to a light shielding treatment as shown in FIG.

Therefore, the optical fiber plate 40 can guide light from the light source only in its thickness direction. The exit end face 411 of the optical fiber plate 4o is treated with a brushed glass surface in order to scatter the emitted light. Therefore, the light emitted from this optical fiber plate 40 has lost its directivity.

Next, the operation of the liquid crystal display device configured as described above will be explained.

Light emitted from a light source (not shown) is incident on the liquid crystal panel 1o from the incident-side polarizing filter 31. The light source light emitted from the liquid crystal panel 10 is incident on the optical fiber plate 40 via the color filter 20 and the exit-side polarizing filter 32.

The optical fiber plate 4o is composed of optical fibers 4.
Since the exit end face 411 is treated with a brushed glass surface, non-directional light is emitted.

Therefore, the device composed of this liquid crystal display device, that is, the image, has no directivity and there is no crosstalk between the optical fibers 41, so the contrast does not change depending on the viewing angle, and a high-quality image without blurring can be obtained. .

In addition, in the embodiment described above, the optical fiber plate 40
Although it has been explained that the exit end face 411 of the optical fiber 41 as a unit constituting the optical fiber 41 is treated with a printed glass surface,
It may also be formed as a convex lens. in this case,
Since the directivity is improved, it is suitable for use in a liquid crystal projector or the like in which an image emitted from a liquid crystal display device is projected onto a screen and the projected image is viewed.

[Effects of the Invention] As described above, in the liquid crystal display device according to the present invention, the outer sheath of the optical fiber constituting the optical fiber plate that guides light only in the thickness direction is shielded from light. Therefore, there is no crosstalk between the respective optical fibers, and there is no change in contrast depending on the viewing angle, making it possible to provide a high-quality, easy-to-read liquid crystal display device without bleeding.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a liquid crystal display device according to the present invention, Fig. 2 is a schematic perspective view of an optical fiber plate, Fig. 3 is a schematic perspective view of one unit of optical fibers constituting the optical fiber plate, and Fig. 4 is a conventional 1 is a schematic configuration diagram of a liquid crystal display device of FIG. 10 - Liquid crystal panel entrance side glass substrate exit side glass substrate liquid crystal entrance side polarizing filter exit side polarizing filter optical fiber plate 40 Optical fiber plate \ "1 32: exit side polarizing filter Fig. 411, exit end surface Fig. 3

Claims (1)

[Claims] (1) In a liquid crystal display device including a liquid crystal panel in which liquid crystal is sealed between an exit side glass substrate and an entrance side glass substrate, and a pair of polarizing filters installed on the entrance side and exit side of the liquid crystal panel, An optical fiber plate configured to guide light from the light source only in the thickness direction is provided on the exit side of the liquid crystal panel, and the outer sheath portion of each optical fiber constituting the optical fiber plate is shielded from light. LCD display device.