JPH11174446A - Reflecting/transmitting mirror for liquid crystal display and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflecting/transmitting mirror for a liquid crystal display excellent in characteristics of reflection and transmission and relatively easy to manufacture. SOLUTION: Plural reflecting planes 14 tilting in the same direction to their reference plane B is arranged on a transparent substrate. Reflecting illumination light is reflected by the surface of a reflecting plane 14 in the direction approximately orthogonal to a reference plane B, and transmitting illumination light is reflected by the surface reflection of the reflecting plane 14 in the direction approximately orthogonal to the reference plane B following the back surface reflection of the reflection plane 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection / transmission mirror for a liquid crystal display, and more particularly to a reflection / transmission mirror for a liquid crystal display capable of efficiently illuminating both a reflection illumination and a transmission illumination with a small loss of light amount.

[0002]

2. Description of the Related Art Liquid crystal displays (LCDs) are widely used as display devices for portable telephones, electronic organizers, etc. due to their lightness and thickness. When a liquid crystal display is used in a portable device, the need for lightness and low power consumption is particularly high, and in many cases, the portable device can use the ambient illumination light most effectively. A transflective type that can share the reflective type and the transmissive type is employed. That is, in a bright environment, display is performed as a reflection type using ambient illumination light, and only in a dark environment, a backlight built in the liquid crystal display is turned on for display.

[0003] There are the following known techniques regarding the transflective type illumination for a liquid crystal display as described above.
Japanese Patent Application Laid-Open No. 8-179125 relates to a transflective polarizing film laminate and a method for producing the same. 30 ° average pigment orientation angle
A configuration characterized by the following is disclosed. Japanese Patent Application Laid-Open No. 9-33721 relates to a transflective polarizing plate for a display device, a method for manufacturing the same, and a display device. Layer and a light diffusion layer in this order, a light reflection / transmission layer having titanium dioxide-coated mica therein as a light reflection layer, and a fine interface between the reflection / transmission layer and the polarizing plate. A structure characterized by being set on a surface having irregularities is disclosed.

[0004]

In any of the above-mentioned reflection / transmission mirrors for a liquid crystal display, the reflection element has only a reflection function, and the transmitted light has a negative effect of only shading. Therefore, the higher the reflection characteristics of the above-mentioned prior art liquid crystal display reflection / transmission mirror, the lower the transmission characteristics, and the higher the transmission characteristics, the lower the reflection characteristics. Naturally, the realization of a reflection / transmission mirror for liquid crystal displays having more excellent characteristics will greatly contribute to this technical field.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of a conventional reflection / transmission mirror for a liquid crystal display, and has excellent reflection characteristics and transmission characteristics and is relatively easy to manufacture. It is an object to provide a reflection / transmission mirror.

[0006]

SUMMARY OF THE INVENTION The present invention provides a transparent substrate,
A plurality of reflection planes inclined in the same direction with respect to the reference plane are provided, and reflected illumination light is reflected in a direction substantially orthogonal to the reference plane by surface reflection of the reflection plane, and transmitted illumination light is reflected on a back surface of the reflection plane. And a reflection / transmission mirror for a liquid crystal display, wherein the light is reflected in a direction substantially orthogonal to the reference plane by surface reflection of the reflection plane. Embodiments of the present invention are as follows. The plurality of reflection planes are formed by arranging linear band regions in parallel. It is characterized in that the plurality of reflection planes are formed of dotted spot-like areas. The plurality of reflection planes are formed by arranging linear band regions in parallel, and a surface between the linear band regions extends in a direction orthogonal to the reference plane.

According to the present invention, a plurality of planes inclined in the same direction with respect to a reference plane are formed on a transparent substrate, and a metal is formed on the plane by vacuum deposition from a direction perpendicular to the plane to form a reflection surface. The reflected illumination light is reflected in a direction substantially perpendicular to the reference plane by the surface reflection of the reflection plane, and the transmitted illumination light is substantially perpendicular to the reference plane by the surface reflection of the reflection plane following the back reflection of the reflection plane. A method for manufacturing a reflection / transmission mirror for a liquid crystal display, wherein the reflection is performed in a direction. An embodiment of the present invention is characterized in that the metal for forming the vacuum film is silver or aluminum.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a reflection / transmission mirror for a liquid crystal display according to an embodiment of the present invention.
As shown in FIG. 1, the reflective / transmissive mirror 1 for a liquid crystal display according to the first embodiment is formed of a plastic material so that one surface is a bottom surface 10 parallel to the reference surface B and the other surface is a reference surface B.
And a prism ridge 16 having a reflection plane 14 inclined at a predetermined angle, for example, 30 ° with respect to the reference plane B. The prism ridges 16 extend linearly and are parallel to each other. The width of the prism ridge 16 is 20 to 150 μm, preferably 30 to 120 μm.
μ. The method of manufacturing the reflection / transmission mirror 1 for a liquid crystal display is as follows. An ultraviolet curing resin, for example, a monomer or oligomer such as an acrylic or epoxy resin is poured into a mold provided with a groove corresponding to the prism ridge 16 and irradiated with ultraviolet light. After hardening, it is removed from the mold.

In another manufacturing method, a polymer material, for example, a cellulose ester such as cellulose triacetate or cellulose diacetate, polycarbonate, a polystyrene resin, an acrylic resin, a norbornene resin, or the like is coated with a groove corresponding to the prism ridge 16. And dried and peeled off.
After being cured by irradiating with an external line, it is extracted from the mold. Still another manufacturing method is to provide an ultraviolet-curing resin layer on a film of polyester or the like, press this against a mold provided with a groove corresponding to the prismatic ridge 16, irradiate with ultraviolet light, and cure the resin. Remove from mold.

The reflection plane 14 is preferably formed to a thickness of 100 by a heating evaporation method, an electron beam evaporation method, a sputtering method or the like.
To form a metal reflective layer of about 1000 Å. When forming a silver reflective layer, it is desirable to provide a protective layer for preventing discoloration. Colored dyes, fluorescent dyes, pigments, ultraviolet absorbers, fine particles, and the like may be added to the plastic material to make the liquid crystal display easier to see. The reflection / transmission mirror 1 for a liquid crystal display thus formed
Is preferably used in combination with a liquid crystal display mode such as twisted nematic (TN), super twisted nematic (STN), hybrid alignment nematic (HTN), cholesteric phase transition, and guest / host mode. Reflective transmission mirror for liquid crystal display 1
Is a liquid crystal display (not shown) using an adhesive, an adhesive or the like.
May be fixed to the polarizing plate, may be simply arranged adjacent to the polarizing plate, or may be further arranged on a backlight light guide plate.

As shown in FIG. 1, in the reflection / transmission mirror 1 for a liquid crystal display having the above-described structure, in the case of so-called reflection illumination, a light beam EL coming from the periphery of the liquid crystal display is reflected by the upper surface of the reflection plane 14, that is, the surface. Then, a liquid crystal display (not shown) is illuminated. In the case of so-called transmissive illumination, a light beam LL from an illumination light source (not shown) arranged adjacent to the reflection / transmission mirror 1 for a liquid crystal display enters from the end face of the reflection / transmission mirror 1 for a liquid crystal display, and firstly. The light is reflected by the lower surface, ie, the back surface of the reflection plane 14, and then reflected by the upper surface, ie, the front surface of the adjacent reflection plane 14, to illuminate a liquid crystal display (not shown). Therefore, the reflection / transmission mirror 1 for a liquid crystal display can use a very high ratio of the surface of the reflection / transmission mirror for a liquid crystal display as a reflection surface or a transmission surface in both reflection illumination and transmission illumination. Lighting efficiency can be obtained.

As shown in FIG. 2, the reflection / transmission mirror 100 for a liquid crystal display according to the second embodiment has a prism ridge 116.
Are formed concentrically. The width of the prism protrusion 116 is 20 to 150 μm, preferably 30 to 120 μm.
μ. As shown in FIGS. 3 and 4, the reflection-transmission mirror 200 for a liquid crystal display according to the third embodiment is provided with prism ridges 216 parallel to each other, and has a side of about 100 to 500 μm.
Are arranged in a grid pattern. The reflection area 202 is, as shown in FIG.
In 02A, the prism ridge 216 extends in the up-down direction, and the reflection plane 214 falls rightward. Reflection area 202B
The prism projection 216 extends in the left-right direction and the reflection plane 2
14 is a downward drop. In the reflection area 202C, the prism ridge 216 extends in the up-down direction, and the reflection plane 214 is directed leftward and downward. In the reflection area 202D, the prism ridge 216 extends in the left-right direction, and the reflection plane 214 is downwardly directed upward.

The reflection / transmission mirror 300 for a liquid crystal display according to the fourth embodiment has a transmission plane 312 and a reflection plane 314 provided symmetrically as shown in FIG. A part of the transmitted light beam LL is reflected on the back surface of the reflection plane 314 and the adjacent reflection plane 3
A portion of the transmitted light beam LL directly passes through the transmission plane 312 and travels upward through the rear surface reflection of the adjacent reflection plane 314 and upward through the surface reflection of the adjacent reflection plane 314.

[0014]

According to the reflection / transmission mirror for a liquid crystal display of the present invention, it is possible to form a reflection / transmission mirror for a liquid crystal display which has excellent reflection characteristics and transmission characteristics and is relatively easy to manufacture.

[Brief description of the drawings]

FIG. 1 is a side view of a reflection / transmission mirror for a liquid crystal display according to a first embodiment of the present invention.

FIG. 2 is a plan view of a reflection / transmission mirror for a liquid crystal display according to a second embodiment of the present invention.

FIG. 3 is a plan view of a reflection / transmission mirror for a liquid crystal display according to a third embodiment of the present invention.

FIG. 4 is a partially enlarged plan view of a reflection / transmission mirror for a liquid crystal display according to a third embodiment of the present invention.

FIG. 5 is a side view of a reflection / transmission mirror for a liquid crystal display according to a fourth embodiment of the present invention.

[Explanation of symbols]

 B Reference plane 1 Reflective transmission mirror for liquid crystal display 10 Bottom surface 12 Transmission plane 14 Reflection plane 16 Prism ridge 202 Reflection area

Claims (6)

[Claims] A transparent substrate is provided with a plurality of reflection planes inclined in the same direction with respect to a reference plane, and reflected illumination light is reflected in a direction substantially orthogonal to the reference plane by surface reflection of the reflection plane, and transmitted. A reflection transmission mirror for a liquid crystal display, wherein illumination light is reflected in a direction substantially orthogonal to the reference plane by surface reflection of the reflection plane following reflection of the back surface of the reflection plane. 2. The reflection / transmission mirror for a liquid crystal display according to claim 1, wherein the plurality of reflection planes are formed by arranging linear band regions in parallel. 3. The reflection / transmission mirror for a liquid crystal display according to claim 1, wherein the plurality of reflection planes are formed of dotted spot-like regions. 4. The plurality of reflection planes are arranged such that straight band regions are arranged in parallel, and a plane between the straight band regions extends in a direction orthogonal to the reference plane. 2. The reflection / transmission mirror for liquid crystal displays according to 1. 5. A transparent substrate, wherein a plurality of planes inclined in the same direction with respect to the reference plane are formed, and a metal is vacuum-formed on the plane from a direction perpendicular to the plane to form a reflecting surface, and the reflected illumination light Is reflected in a direction substantially perpendicular to the reference plane by surface reflection of the reflection plane, and the transmitted illumination light is reflected in a direction substantially perpendicular to the reference plane by surface reflection of the reflection plane following the back reflection of the reflection plane. A method of manufacturing a reflection / transmission mirror for a liquid crystal display. 6. The reflection / transmission mirror for a liquid crystal display according to claim 5, wherein the metal to be vacuum-formed is silver or aluminum.