JPS63292187A - Liquid crystal panel construction - 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 <Industrial Application Field> The disclosed technology belongs to the structural technology field of liquid crystal panels used in color liquid crystal televisions and the like.

<Summary of the gist> The invention of this application relates to a liquid crystal panel structure in which a transparent electrode is interposed between a pair of glass substrates, and a liquid crystal is inserted between the transparent electrodes, and in particular, one The outer surface of one of the glass substrates for incident light is formed as a condensing reflection surface to have a concave mirror function with a focal point such as a focal point, or the inner surface of one of the glass substrates is formed as a total reflection surface. This invention relates to a liquid crystal panel structure in which the other glass substrate has a concave mirror function as a condenser lens.

<Prior art> As is well known, advanced informationization has been promoted not only in industrial society but also in civil society in recent years, and devices and devices related to information types are the most information processing among the sense organs. 2. Description of the Related Art Optical information processing systems that have excellent functions that affect vision have made considerable progress, and in particular, image processing technology for televisions and the like has made remarkable progress.

For image processing systems such as televisions, on the one hand, CRT display television technology has been developed as a direct viewing type, and there are also enlarged projection systems such as over-the-top projectors, but they are inferior in brightness. ,
On the other hand, LCD TVs have the advantage of being micro-sized and can use their light transmittance to project enlarged images onto a screen, etc., so image processing by TVs is becoming polarized. On the other hand, as mentioned above, liquid crystal televisions and the like are being increasingly researched and developed in various fields due to their excellent light transmittance.

As is well known to those skilled in the art, the liquid crystal panel that directly participates in the image forming function of the liquid crystal television is a pair of polarizing panels, with transparent electrodes installed on the inner surfaces of a pair of glass substrates, and a liquid crystal interposed between them. Although it has the advantage of being micro-sized, it has the disadvantage of requiring multiple steps in manufacturing and handling, and is accompanied by cumbersome work.

<Problems to be Solved by the Invention> As mentioned above, since the liquid crystal of liquid crystal televisions and the like is small and compact, there is a demand for a reduction in the size of the projection device as well.

Therefore, the conventional method that takes advantage of the light transmittance of liquid crystal and places the light source side and the projection side in front of each other with the liquid crystal panel as a boundary has the problem that the device becomes larger because the incident optical path and the reflected optical path are double effective. To deal with this, technologies are being developed that allow incident light and reflected light to be formed on the same front side, and to provide a reflective mirror on the back side of the liquid crystal panel to make it more compact. .

However, if separate condensing lenses and reflectors are attached to the front and back of the liquid crystal panel, the incident light will be reflected by the condensing lens and the surface of the liquid crystal panel, and the reflected light will be condensed by the liquid crystal panel. This has the disadvantage that light is reflected on the surface of the lens, resulting in light loss.

In addition, since the reflective surface of conventional total reflection mirrors is formed on the back surface, the liquid crystal panel and the reflective surface are separated, causing a misalignment between the optical paths of incident light and reflected light at the position of the liquid crystal panel. There was also the inconvenience that the image projected on the screen was doubled, causing flickering.

<Object of the Invention> The object of the invention of this application is to solve the technical problem of solving the structural problems associated with the liquid crystal panel based on the above-mentioned prior art, or the reflecting mirror or Fresnel lens attached to the liquid crystal panel. By using the basic functions of the LCD panel as is, the LCD panel itself has both a reflection function and a light gathering function, and the structure is simple, and it is easy to provide a cooling function. The purpose of this invention is to provide an excellent liquid crystal panel structure that will benefit the field of optical technology application in industry.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of the invention of this application, which is summarized in the above-mentioned claims, is to solve the above-mentioned problems. The light enters from the outer surface of the glass substrate on the incident light side of the liquid crystal, which has a transparent electrode inside, passes along with image information due to the action of the transparent electrode, and enters another glass substrate on the back surface, which functions as a concave mirror on the outer surface. The light is reflected by a condensing reflective surface with By interposing separate polarizing panels for light and reflected light, the structure of the liquid crystal panel is significantly simplified, and instead of the above structure, a convex lens function is installed on the outer surface of the glass substrate on the incident light side. The inner surface of the opposite glass substrate serves as a total reflection surface and is reflected, and the focused reflected light can also be projected as an enlarged image onto a screen through a projection lens. In this way, a cooling mechanism can be installed directly on the back side of the total reflection surface, and a separate total reflection mirror or Fresnel lens is not installed on the liquid crystal panel, and a polarizing panel is also installed directly on the liquid crystal panel. This technology has taken technical measures that have made it possible to simplify the structure by eliminating the need for a projection device, and to significantly reduce the size of the projection device and the like.

<Embodiments - Configuration> Next, embodiments of the invention of this application will be described below based on the drawings.

The embodiment shown in FIG. 1 is one basic embodiment;
is a liquid crystal panel that forms the center of the invention of this application, and in this embodiment, a color image of the television is formed by an electronic drive device (not shown), and a pair of glass substrates, temporary 2. 3, a liquid crystal 5 is installed therebetween via a pair of transparent electrodes 4.4, as in the conventional embodiment.

Therefore, in the invention of this application, the front glass substrate 2
The outer surface 6 and the inner surface 7 are formed in parallel optical planes as in the conventional embodiment.

In this embodiment, the outer surface 6 of the front glass substrate 2 is coated with a surface antireflection film using a well-known technique.

Although the front inner surface 8 of the rear glass substrate 3 is formed into an optical plane parallel to the front glass substrate 2, the rear surface, that is, the outer surface 9, is a light source, etc. A condensing point 1 of the reflected light is located at a position eccentric to the light emitting point 10 side of the light emitting point 10.
As shown in FIG. 2, a large number of narrow, perfect circular reflecting surfaces 12, 12... are formed concentrically at a predetermined pitch so as to have a concave mirror function. Therefore, each reflective surface has a function similar to a concave mirror having a focal point at the condensing point, and the entire reflective surface 12.
12... are arranged in a plane as shown in FIG.

In the invention of this application, unlike the conventional liquid crystal panel, polarizing panels 13 are separately provided between the light emitting point 10 and the liquid crystal panel 1 and between the light converging point 11 and the liquid crystal panel 1. Therefore, as shown in FIG. 1, each polarizing panel 13 can be made smaller than when attached to the liquid crystal panel 1, and it is possible to install the expensive polarizing panels together while reducing the cost. is made possible.

Further, in the liquid crystal panel 1 of the invention of this application, a condensing lens such as a total reflection mirror or a Fresnel lens is not provided on the back surface of the panel, and the glass substrate 3 on the rear side is provided with a condensing lens and a total reflection mirror. It has both functions, and therefore its structure is extremely simple.

<Embodiment - Effect> In the above-described configuration, when a color television image formed on the liquid crystal panel 1 is enlarged and projected onto a screen (not shown) by an electronic drive device (not shown), the light emitting point 1G of the light source, etc.
Incident light 14 from the front glass substrate 2 of the liquid crystal panel 1
Then, it enters the liquid crystal 5, and by the action of the transparent electrode 4.4, a color TV image is placed on the glass substrate 3 on the rear side.
It is totally reflected by the condensing reflective surfaces 12, 12... on the outer surface of the condensing light, and is transmitted through the liquid crystal 5 and the front glass substrate 2 by the concave mirror function of each ring-shaped reflective surface, and reaches the condensing point 11. The incident light 14 and the reflected light 15 are focused on each light emitting point 10 and the polarizing panel 13 provided close to the light focusing point 11.
．． 13, and an enlarged color television image can be projected onto a screen (not shown) by a projection lens (not shown).

Next, the embodiment shown in FIG. 3 is another basic embodiment, in which the concave mirror function of the above embodiment is applied to the front glass substrate 2'.
The outer surface of the front surface of the front glass substrate 2' is concentrically formed with a light condensing point 11 at a position eccentric to the light emitting point 10 of the light source etc., as in the above embodiment. A large number of perfectly circular refractive surfaces 12', 12' with a predetermined pitch.
. . . Therefore, in this embodiment, although the other glass substrate 2' has its inner surface 7 formed into an optical plane, it is a kind of convex lens or,
It is formed on a condensing lens.

The outer surface 9' of the rear glass substrate 3' is formed into an optical plane, and the inner surface 8' parallel to the outer surface 9' is formed with a total reflection surface 16 made of aluminum vapor deposition or the like.

Of course, the liquid crystal 5 interposed between the glass substrates 2' and 3' is the same as the conventional one, and the transparent electrodes 4 and 4' installed therein are
Similarly to the conventional system, a color television image is formed by an electronic driving device (not shown).

Further, in this embodiment, since the light emitting point 10 and the light converging point 11 are located at eccentric positions relatively close to each other, one polarizing panel 13 is also provided between the liquid crystal panel 1' and the liquid crystal panel 1'.

In this embodiment, the incident light 14 from the light emitting point 10 is incident on the glass substrate 2' on the front side of the liquid crystal panel 1'. Since it is formed in a lens, the light is once focused, enters the liquid crystal 5, carries a color TV image, and is immediately reflected by the total reflection surface 16 of the rear glass substrate 3'. The condensing lens 2' on the front glass substrate can be used without duplicating the color image and transmitting it.
It is possible to further narrow down the light and condense the light at a displaced position closer to the light emitting point 10 than in the above embodiment, and to project an enlarged color television image onto the screen by a projection lens (not shown).

In each of the embodiments described above, a desired cooling mechanism can be directly attached to the glass substrate 3.3' on the rear side of the liquid crystal 5, so that the cooling effect of the liquid crystal panel 1.1' can be promoted. This makes it possible to prevent the temperature of the liquid crystal panel 1.1' from rising and to sufficiently maintain the color television image forming function.

In this embodiment, each ring-shaped refractive surface 12',
12'... are coated with a surface anti-reflection film by a well-known means to increase the efficiency of light utilization.

The embodiment shown in FIG. 4 is an embodiment of an actually compact color television image enlargement projection device 17 on a screen, and in this embodiment, the casing 18
It is equipped with all the equipment including an electronic drive unit for color television image formation (not shown) and a battery, making it portable.To explain only the optical system, there is a liquid crystal panel 1 provided on the negative side. A light source 10' such as a halogen lamp is provided on the opposite side, and a condenser lens 19, a polarizing panel 13, and a cold mirror 20 are provided at a set angle for the incident light 14, and a total reflection mirror 21 is provided above it. via another polarizing panel 13 and the projection lens 2
2 is provided.

Therefore, as shown in FIG. 4, in this embodiment, a condenser lens 19, a cold mirror 20. Total reflection mirror 21, projection lens 22, and polarizing panel 1
3.13 are placed in close proximity to each other, and in a manner that their incident light 14 and reflected light 15 do not interfere with each other.

In this example, light [10'
Incident light 14 is focused by a condenser lens 19, reflected by a cold mirror 20, and converted into infrared rays 14'.
As mentioned above, the temperature increase of the liquid crystal panel 1 is more actively prevented together with the cooling device provided on the rear side of the liquid crystal panel 1, and therefore, the cooling device of the liquid crystal panel 1 can also be made simple and compact. It is made possible to do so.

Then, the incident light 14 reflected from the cold mirror 20
Similar to the embodiment shown in FIG. 1.2, the light is incident on the liquid crystal panel 1, reflected by the rear glass substrate 3 with the color television image formed by the liquid crystal 5, and transmitted through the liquid crystal panel 1 again. The light is reflected by a total reflection mirror 21, and an enlarged color television image can be projected onto a screen (not shown) by a projection lens 22.

During this time, inside the casing 18, the polarizing panel 13.
13 is provided by utilizing the space, the liquid crystal panel 1 is formed into an extremely compact and small size, and temperature rise is prevented and clear color TV images are produced, similar to the embodiment shown in Figure 1.2 above. can be projected onto the screen.

Next, the embodiment shown in FIG. 5.6 is an embodiment of another color television image enlargement projection device 17', in which a guichroic prism 24 provided at a predetermined position inside a casing (not shown) has a reflective surface. It is installed in an X-shape, with a monochrome liquid crystal panel 1' for R (red) and a monochrome liquid crystal panel for B (blue) on the sides other than the front, that is, on both sides and the rear. 1', G (green) monochrome liquid crystal panels 11' are arranged, and a glass substrate 2' having a reflective surface 12' on the outer surface shown in FIG. 3 is attached to the front surface of each of them. .

And monochrome liquid crystal panel 1 for straight transmission type G
A color filter 25 is disposed in front of ``.

The color filter 25 is for absorbing the leakage of R (red) and B (blue) by the X-shaped reflecting surface of the dichroic reflector 8.

A cold mirror 20 is provided in front of the lower part of the dichroic prism 24 to transmit the infrared rays 14' to prevent functional deterioration of each monochrome liquid crystal panel 1', 11.11 due to thermal effects. It's like that.

A halogen lamp 10' as a light source having a concave mirror for reflection is provided in front of the cold mirror 20 via a condenser lens 14'.

In addition, in front of the dichroic prism 24, one polarizing panel 13 is provided across the cold mirror 20,
A projection lens 22 is provided at the front thereof, and a total reflection mirror 21 is further provided at the front thereof to form a reflected optical path 15 to the screen 23.

The cold mirror 20, condenser lens 14', polarizing panel 13, halogen lamp 10', projection lens 22, and total reflection mirror 21 on the side of the incident optical path 14 are close to the dichroic prism 24, and their respective incident optical paths are 14 and the reflection optical path 15 are compactly set in a casing (not shown) in close proximity.

Therefore, in this color image projector 17', each monochrome liquid crystal panel 1', 1#, 11 does not have a polarizing panel, a total reflection mirror, or a Fresnel lens.
Since it functions with only one polarizing panel 13 installed between the dichroic prism 24 and the projection lens 22, five polarizing panels are omitted compared to a normal monochrome liquid crystal panel, resulting in a significantly simpler structure and lower cost. Efforts are being made to reduce costs.

In the color television image projecting device 17' of this embodiment, when projecting an enlarged color image onto the screen 23, by turning on a switch (not shown), each monochrome liquid crystal panel is 1', 1', and 1'' are formed, and white light from the halogen lamp 10' is irradiated onto the cold mirror 20 via the condenser lens 14', infrared rays 17 are transmitted, and visible light is transmitted. The light is totally reflected and enters the dichroic prism 24.

At this time, the incident light beam of the incident optical path 14 is as shown in FIG.
Linearly polarized longitudinal waves are incident on the polarizing panel 13 interposed in the front part of the dichroic prism 24, and the dichroic prism 8 causes G (green) to travel straight and R (red).
and B (blue) are reflected and incident on the monochrome liquid crystal panels 1', i', and i', respectively, reflected on the reflective surface 12' of the glass substrate 2' on the front side of the surface reflection, and focused again by the dichroic prism 24. The images are enlarged by the projection lens 22, reflected by the full-reflection mirror 21, and projected onto the screen 23 in a superimposed manner.

At this time, the light of each color incident on each monochrome liquid crystal panel 1', 11111 enters the condenser lens 2' of the glass substrate 2', which also functions as a condenser lens, and is transmitted again, as shown in Figure 3. Therefore, the aperture effect is extremely efficient, and it also passes through the monochrome liquid crystal panel 1', 11111 twice, and is totally reflected by the reflection surface 16 of the rear glass substrate 3'. The angle of reflection due to total internal reflection is small, and therefore the angle of reflection in all areas is extremely narrow compared to the conventional mode, there is less scattering of light, and there is no color shift, and the monochrome liquid crystal panel 1 ', i', and i' are transmitted twice, so a clear image can be captured, and as shown in FIG. The polarized light is transmitted through the polarizing panel 13 through the switching action of each monochrome liquid crystal panel 1', 1', and 11, and is reflected by the reflective surface 16 of the glass substrate 3' on the rear side.
, 1', and ze, and is further controlled to transmit or not transmit through the polarizing panel 17.

Here, the polarization angle of each monochrome liquid crystal panel 1', 1', 1'' was adjusted to 90' using the technology developed so far.
By installing the monochrome liquid crystal panels 1' and 11.1' at an angle of 45 degrees, the polarized light twisted by the monochrome liquid crystal panels 1' and 11.1' is reflected by the reflective surface 16 of the glass substrate 3' and is further twisted by 45 degrees. As a result, according to this embodiment, monochrome liquid crystal panels 1', 1', 1
', even if one polarizing panel 13 is attached in front of it, there will be no functional problem.

The embodiments of the invention of this application are, of course, not limited to the above-mentioned embodiments; for example, the applicable liquid crystal panels may be applied not only to color image forming liquid crystal panels but also to monochrome liquid crystal panels. As an example of application, it can also be applied to pixels for forming original images such as slides.

<Effects of the Invention> As described above, according to the invention of this application, in a liquid crystal panel used for a color image projection device that enlarges and projects a color television image onto a screen via a liquid crystal panel, a transparent electrode is provided between a pair of glass substrates. By providing a glass substrate with a light emitting side and forming a light condensing reflective surface on the outer surface of one of the glass substrates, the outer surface can perform total reflection and light condensation in the same way as a concave mirror. Therefore, the device can be made extremely compact, and there is no need to install a polarizing panel, and the total reflection mirror eliminates the need for a condensing lens such as a Fresnel lens. As a result, the size of the liquid crystal panel can be reduced, which has the advantage of making the device more compact.

Furthermore, since a cooling device or the like can be directly attached to the back surface of the liquid crystal panel itself, an excellent effect is achieved in that the function of the liquid crystal panel does not deteriorate due to temperature rise.

Further, by using a liquid crystal panel with a 45° twist, an excellent effect can be achieved in that only one polarizing panel can be used.

In addition, by making the inner surface of one glass substrate of the liquid crystal panel a total reflection surface and the outer surface of the other glass substrate having a condensing lens function, the incident light that passes through the liquid crystal is immediately directed to the back surface of the liquid crystal. Since the incident light can be totally reflected, the projected image does not become double, and an excellent effect is achieved in that an extremely clear image can be obtained.

In this way, according to the invention of this application, since the device using the liquid crystal panel can be made more compact, the optical information equipment can be made more compact, making it convenient to combine with the device, carry, and store it. is played.

[Brief explanation of the drawing]

The drawings are detailed explanatory diagrams of the invention of this application, in which FIG. 1 is a sectional view of one basic example, FIG. 2 is a front view of one of the glass substrates, and FIG. 3 is a sectional view of another basic embodiment. 4 is a schematic sectional view of an enlarged projection device, FIG. 5 is a schematic sectional view of another projection device, FIG. 6 is a plan view thereof, and FIG. 7 is an exploded perspective view of a liquid crystal panel and a polarizing panel assembled together.

Claims (2)

[Claims] (1) A liquid crystal panel structure in which a transparent electrode is installed between a pair of glass substrates and a liquid crystal is interposed therebetween, wherein the outer surface of one of the glass substrates is formed as a light-condensing and reflective surface. structure. (2) In a liquid crystal panel structure in which a transparent electrode is installed between a pair of glass substrates and a liquid crystal is interposed between them, the inner surface of one glass substrate is formed as a reflective surface, and the outer surface of the other glass substrate focuses light. A liquid crystal panel structure characterized by being formed on a lens.