JPH11194711A - Flat panel display - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a double image due to reflection of a front panel, to improve a spectral characteristic of emission color of a display element, and to cut off unnecessary light in a near infrared region in a flat display device. It is an object of the present invention to provide means for easily shielding electromagnetic waves generated from a display element surface. SOLUTION: In a flat panel display device, by filling a space between a front plate and a display element with a liquid or gel-like substance, unnecessary reflection can be reduced and an additive is added to the liquid or gel. Thereby, the balance adjustment of the emission color and the shielding of the electromagnetic wave can be easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device such as a plasma display panel or a liquid crystal panel, and has functions such as anti-reflection, electromagnetic wave cut, infrared cut, and color correction by a combination of a front plate and a gel material. It provides a means to do it rationally.

[0002]

2. Description of the Related Art Conventionally, in a plasma display,
For anti-reflection, color correction, near-infrared cut, electromagnetic wave shielding, etc., these functional films are formed on the sheet by attaching an optical thin film directly on the front plate or adding additives, and pasting it on the front plate The purpose has been achieved by attaching. JP-A-9-145918, JP-A-9-145
No. 919, Japanese Patent Application Laid-Open No. 9-51494, and the like describe the detailed method.

[0003]

However, in the above-mentioned conventional structure, since an air layer exists between the front surface subjected to the antireflection treatment and the display element, the display is performed by reflection on the back surface of the front plate or reflection on the display element surface. There was a problem that characters formed double images. In order to solve this, not only the anti-reflection treatment is performed on both surfaces of the front plate, but also the surface of the display element is required to have an anti-reflection treatment. In addition, color correction, near infrared cut,
Since the electromagnetic wave shield and the like are configured by laminating sheets for respective functions, the cost is high.

Further, Ag thin films used for electromagnetic wave shielding are expensive because they are formed by vacuum evaporation. Accordingly, an object of the present invention is to solve the double image problem caused by the front panel of a flat display device such as a plasma display, and to easily realize functions such as color correction, near-infrared cut, and electromagnetic wave shielding. Is to provide a configuration of the front plate.

[0005]

In order to solve the above-mentioned problems, a flat panel display device according to the present invention comprises filling a space between a display element and a front plate with an optically transparent liquid or gel-like substance. It is characterized in that reflection on the rear surface of the front plate and the surface of the display element is prevented to prevent double images.

[0006] Further, by adding an appropriate pigment or dye as an additive to the liquid or gel, color correction and near-infrared shielding can be easily performed. The effect is obtained.

According to the present invention, prevention of a double image by an antireflection effect can be easily realized without directly performing processing such as antireflection on a display element. In addition, functions such as color correction, near-infrared cut, and electromagnetic wave shielding can be realized without changing the basic configuration.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention relates to a flat panel display device, wherein an optically transparent liquid or gel material is filled between a display element for displaying an image and a front plate. By doing so, it has the effect of reducing the reflection on each surface and reducing the reduction in contrast due to reflection of double images and room light.

According to a second aspect of the present invention, there is provided the flat panel display device, wherein an appropriate pigment or dye is added to a liquid or gel-like substance filled between the front panel and the display element. It is characterized by controlling transmittance characteristics, and has an effect of optically adjusting the balance of red, green, and blue spectral characteristics of emission colors of the display element.

In addition, by adding a pigment or a dye that selectively absorbs near-infrared wavelengths, the function of preventing a remote control device from malfunctioning due to near-infrared light generated when the plasma display emits light can be prevented. It is a thing to do.

According to a third or sixth aspect of the present invention, in the flat panel display device, fine particles of a metal or the like suitable for a liquid or gel substance filled between the front panel and the display element. Is added to make the liquid or gel conductive, and has an effect of shielding an electromagnetic wave from a surface of a plasma display, a liquid crystal display element, or the like.

The invention according to a fourth aspect of the present invention is characterized in that, in the first, second and third aspects, the gels are independently formed in layers, and the respective functions are realized independently. This has the effect that adjustment for each function can be performed independently for the other functions.

According to a seventh aspect of the present invention, in the flat panel display device, a gel-like substance filled between the front panel and the display element is made conductive by dissolving the gel substance in a solvent on the front panel. Plasma display is characterized by forming a conductive film by applying thin metal particles such as mixed silver thinly to several microns or less, then evaporating the solvent, gently injecting the liquid and then gelling. It functions to shield electromagnetic waves from the surface of a liquid crystal display device or the like.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a sectional view of a flat panel display device. In FIG. 1, an optically transparent liquid 3 or a gel-like substance 4 is filled between a display device 1 and a front plate 2. I have. In contrast to this, FIG. 9 shows a conventional example, in which an air layer is provided between the display element 1 and the front plate 2, and an antireflection sheet 6 and an electromagnetic wave shielding sheet 30 are affixed to the front plate 2.

FIG. 2 shows the principle diagram of the present invention in comparison with a conventional example. In the conventional example, a part of the outgoing ray 7 emitted from the display element is reflected on the surface of the display element 1 to become reflected light 8 and returns to the display element to cause a problem such as a double image. In the present invention, a liquid having a refractive index close to the refractive index of the glass constituting the display element,
Alternatively, by using a gel (refractive index: 1.44 to 1.52), the reflected light is greatly reduced, and a double image is prevented.

Although the light 10 having a larger emission angle causes total reflection as shown in the drawing, this phenomenon can be prevented according to the present invention. The light ray 7 also generates reflected light 9 on the back surface of the front plate to lower the contrast of the display element.
Similarly, the reflected light can be reduced.

The reflected light 12 and 13 are also reduced for the incident light 11 traveling from the room to the display element, and the contrast with respect to external light is improved. The front plate is made of glass or a transparent resin such as acrylic or polycarbonate. Instead of the antireflection sheet 6, the front plate 2 may be directly coated with an antireflection thin film.

(Embodiment 2) FIG. 3 is a sectional view showing a main part of a flat panel display device. In FIG. 3, the display element 1
In addition, the optically transparent liquid 15 or the gel-like substance 16 filled between the front plate 2 contains an additive that absorbs or reflects a specific wavelength, and has an orange transmission shown in FIG. The absorption band 17 that adjusts the variation in the emission characteristics of red, green, and blue by adjusting the ratio and optically realizes the balance in white, and the emission in the near infrared region from 800 to 1000 nm is cut, Controller LE
Absorption band 1 preventing malfunction due to interference with D emission
Eight.

(Embodiment 3) FIG. 5 is a sectional view showing a main part of a flat panel display device. In FIG. 5, the display element 1
By adding fine particles such as conductive metal or carbon to the optically transparent liquid 21 or the gel-like substance 22 filled between the front plates 2, it becomes electrically conductive, By applying a current to the electric ground, the electromagnetic waves coming out of the front panel are shielded.

(Embodiment 4) FIG. 6 is a sectional view showing a main part of a flat panel display device. In FIG. 6, the display element 1
And an optically transparent gel-like substance filled between the front plates 2 is multi-layered according to function, that is, a gel layer 23 for adjusting color balance, a gel for cutting off near-infrared light. By comprising the layer 24 and the gel layer 25 for shielding electromagnetic waves, the function can be adjusted independently of each other, and the double image can be prevented and the external light contrast can be improved as a whole. In the production method of multi-layering, gelation may be carried out by gelling one layer at a time, but it may be constituted by laminating gel-like sheets.

(Embodiment 5) FIG. 7 is a sectional view showing a main part of a flat panel display device. In FIG. 7, the display element 1
The gel-like substance 22 is filled between the front plate 2 having a layer of conductive metal or carbon particles formed on the back surface to shield electromagnetic waves from the front surface. FIG. 8 shows an example of the manufacturing method. Silver fine particles 27 mixed in a solvent 26 are thinly and uniformly applied to the back surface of a front plate by a coater, and dried to evaporate the solvent 26. Next, the front plate is assembled, and the space between the display element 1 and the front plate 2 is filled with a liquid before gelation, and then heat is applied to promote gelation. As a result, the silver thin film 28 is fixed by the gel 22, and a good thin conductive film can be easily formed.

[0022]

According to the present invention, in a flat panel display device such as a plasma display or a liquid crystal panel, an optically transparent liquid or a gel-like substance is filled between a front panel and a display element to form an interface. It is intended to reduce reflection and prevent a decrease in contrast caused by reflecting a double image or room light. Also, pigments in liquid or gel-like substances,
Alternatively, by adding a dye, unnecessary light is reflected or absorbed to improve the color balance of the display element, and by cutting the near infrared light to 15% or less, malfunction of the remote control can be prevented. Further, the addition of fine metal particles to the gel-like substance has an effect of shielding electromagnetic waves. In addition, the effect of shielding electromagnetic waves can be easily realized by a combination of a thin film of silver and a gel-like substance.

[Brief description of the drawings]

FIG. 1 is a sectional view of a flat panel display according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a cross section of a main part of an antireflection structure according to a first embodiment of the present invention in comparison with a conventional example

FIG. 3 is a sectional view of a main part of a flat panel display according to a second embodiment of the present invention.

FIG. 4 is a spectral transmittance characteristic diagram according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a cross section of a main part of a flat panel display device according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a cross section of a main part of a flat panel display device according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view of a main part of a flat panel display device according to a fifth embodiment of the present invention.

FIG. 8 is a diagram showing a process of forming a metal thin film according to a fifth embodiment of the present invention.

FIG. 9 is a diagram showing a basic configuration of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 display element 2 front plate 3 liquid 4 gel-like substance 5 rubber packing 6 anti-reflection sheet 7 outgoing light 8 reflected light (a) 9 reflected light (b) 10 total reflected light 11 incident light 12 reflected light (c) 13 reflected light (D) 15 liquid 16 gel substance 21 liquid 22 gel substance 23 gel layer (color balance) 24 gel layer (near-infrared cut) 25 gel layer (electromagnetic wave shielding) 26 solvent 27 silver fine particles 28 silver thin film 30 electromagnetic wave shielding sheet 31 fixed chassis 32 fixing bolt 33 outer case

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09F 9/35 G09F 9/35

Claims (6)

[Claims] 1. A flat panel type comprising a flat panel display element such as a plasma display panel and a liquid crystal display panel, a front plate for protecting a front surface of the flat panel display element, and a circuit for driving the flat panel display element. A flat panel display device, wherein a space between the flat panel display element and the front plate is filled with an optically transparent liquid or gel-like substance. 2. A liquid or gel-like substance filled in the space between the display panel and the front plate, wherein a pigment or a dye which reflects or absorbs light in a specific wavelength band is added. Flat panel display. 3. The flat display device according to claim 1, wherein the liquid or gel-like substance filled in the space between the display panel and the front plate is a conductive material. 4. A liquid or gel material to which a pigment or a dye that absorbs light in a specific wavelength band is added and a liquid or gel material having conductivity are formed in a multilayer structure. The flat panel display according to claim 1. 5. The flat panel display according to claim 3, wherein minute metal particles are added to the gel material. 6. A method of applying fine conductive particles to the back side of the front plate,
4. The flat panel display device according to claim 3, wherein the flat display device comprises a conductive thin film.