JPS59210418A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To eliminate a difference in visibility with an angle of visibility by providing an optical member formed by arranging light guide elements which guide light from individual picture elements on the display screen of a dot matrix type transmission liquid crystal display device in a panel shape. CONSTITUTION:A light guide panel 20 is provided closely to the side of the liquid crystal panel 10 of the transmission type liquid crystal display device opposite to a light source 13, i.e. the surface of the panel 10. The width of one side of the reverse surface 24 of the panel 20 is equalized to the effective display width (d) of the panel 10, and the width of the top surface 25 is equalized to the width D of the pnale 10 to form a trapezoid. A light guide panel 20 is constituted by bundling numbers of light guide tubes 21 obtained by forming resin or metallic vapor-deposited layers 23 which have different refractive indexes on the surfaces of rod bodies 22 made of high-purity methacrylic resin, etc., which has high transmittivity so as to guide light out of respective picture elements on the liquid crystal display panel. A circuit board 11, driver 12, and eflecting plate 14 are provided on the panel 10 at the side of the light source 13. Thus, the difference in visibility is eliminated by the simple device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a liquid crystal display device, and more particularly to a display device that eliminates visual differences due to viewing angles of a liquid crystal display surface.

(Prior Art) Regarding liquid crystal displays, it has already been pointed out that there are inconveniences in image reading caused by viewing angles. In particular, in recent translucent liquid crystal color display devices that use the do-not-drinks method, as can be clearly seen in Figure 1, there is a difference in the position in the thickness direction between the transparent electrode a and the substrate that is color-coded into the three primary colors. Due to this, the inconvenience of viewing a color different from the actually displayed color cannot be ignored.

(Purpose) The present invention was made in view of such disadvantages, and
The purpose is to provide a new liquid crystal display device that allows images to be viewed accurately regardless of the viewing angle by adding a simple optical member.

(Structure) Therefore, details of the present invention will be described below based on illustrated embodiments.

What is shown in Fig. 2.3 is a large display device which constitutes an embodiment of the present invention and is constructed by arranging a large number of translucent liquid crystal display panels. This panel 20 is a light guide panel that forms a characteristic part, and this panel 20 is arranged close to the light source 13, that is, on the front surface side of the liquid crystal panel 10 so as to protect the surface thereof.
1 is formed into a panel shape. This light guide panel 20 has a -
・Effective display IT on side 1 night product panel 10] Same as d
Also, 14 holes on the 25 side of the surface so that
It is formed into a substantially trapezoidal shape so as to have the same TID as the liquid crystal panel 10 itself.

By the way, the light guide tube 21 marked -1- is an optical member that guides the light from the light source 13 led out through the intersection of the column II electrode 2 and the row' electrode 4, that is, the "pixel", to the display surface. i53
As shown in the figure, a resin layer or metal vapor deposition layer 23 having a different refractive index is formed on the surface of a rod-shaped body 22 made of a material with extremely high light transmittance, such as high-purity methacrylic resin. Furthermore, by forming a tapered shape with a cross-sectional area corresponding to the area of a pixel, and converging a large number of these, a trapezoidal light guide panel 20 as described above is constructed. .

In addition, 4'J゛'t l 1 in l\1 is a circuit board, 12
and 14 indicate a reflector, respectively.

In the above example, the currently selected column'electrode 2
When the light valve is applied to the row electrode 4 and the light valve of the pixel part forming the intersection of these opens, the light from the light source passes through the pixel part and is directed to the opposite end of the light guide tube 21. The light guide panel 20 forms an image on the substantial display surface formed by the light guide panel 20 that does not cause any difference in visibility depending on the viewing angle.

FIG. 4 shows another embodiment of the light guide panel and light guide tubes described in -1-, and then connects a large number of light guide tubes 31 to a portion corresponding to the length of one side of the liquid crystal panel 10. Then, the plurality of light guide plates 33 formed in this way are attached to the other side of the liquid crystal panel 10. The back side, that is, the side opposite to the front side of the liquid crystal panel 10, is compressed from the side in the direction of the arrow, and the back side has an area corresponding to the effective display area of the liquid crystal panel 10. According to this embodiment, 1. f light guide towel 30
The production becomes significantly easier. In this embodiment, the light entrance end surface 32 of the light guide tube 31 is formed into a lens shape, and this allows the orientation of the ☆11 side surface 32 and the liquid crystal pie, the direction of the 10th surface, or the image between the end surface 32 and the pixel to be different. ) Light can be guided accurately even if the device is slightly misaligned.

Yet another embodiment of the invention illustrated in FIG.
- This is a general display device that forms an image on a liquid crystal display panel 10'. The light guide panel 40 is bound with a colorless binder and placed in close proximity to the liquid crystal display panel 10''. According to this embodiment, the light guide panel 40 can be manufactured more easily.

(Effects) As described above, according to the present invention, a panel-shaped optical member consisting of a large number of light guide elements is disposed on the surface of a liquid crystal display panel, so that light can be derived from 2/2 pixels per display surface. The light can be guided to the display surface 2 by an optical element corresponding to each pixel, and an image can be displayed without causing any difference in visibility on the surface of the optical member that constitutes the substantial image surface. In addition, since the optical members on the panel are placed squarely on the liquid crystal display panel, not only does the thickness of the device's eye body not become too large, but the liquid crystal display panel itself can be adjusted to the desired level without the need for special reinforcing materials. can be configured to the size of

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the cause of visual recognition difference in a liquid crystal display device, and FIG. 2 is a side view of a device showing an embodiment of the present invention.
Figures 3 (a) and (b) are a side view and a side view of the light guide panel, and Figures 4 (a) to (c) are a side view and a side view showing other embodiments of the light guide panel. FIG. 5 is a side view showing still another embodiment of the same panel. 1.2...Pa electrode 10...Display unit 2
0.30.40...Light guide panel 21.31...Light guide tube 41...Optical fiber Fig. 1 73~Q $ , b-@ Fig. 2 (A) (B)

Claims (1)

[Claims] In a translucent liquid crystal display device that uses a dot matrix method, light from individual pixels on the display screen is guided (a panel-shaped optical member is constructed from a large number of light guide elements, and the optical member is used to display a liquid crystal display). A liquid crystal display device characterized in that it is arranged close to the surface of a panel.