CN100395865C - Composite substrate capable of emitting light from both sides - Google Patents

Abstract

The invention relates to a field emission backlight assembly with two-side light emitting, which comprises a first light-permeable substrate, a second light-permeable substrate and a plurality of space supports, wherein the first light-permeable substrate is arranged on the first light-permeable substrate; wherein a plurality of first conductors extending in parallel are arranged on one surface of the first light-permeable substrate, a plurality of emitters are arranged on the first conductors at intervals at equal intervals, a plurality of second conductors extending in parallel are also arranged on the first conductors, the plurality of first conductors and the plurality of second conductors are parallel to each other and are in staggered configuration, or the plurality of first conductors and the plurality of second conductors are in vertical configuration, a light-permeable insulating layer is also arranged between the plurality of first conductors and the plurality of second conductors, and the first conductors adopt transparent media; the second light-permeable substrate is arranged in parallel to the first light-permeable substrate, and a fluorescent layer is coated on the surface facing the first light-permeable substrate; the space support is located between the first light-permeable substrate and the second light-permeable substrate.

Description

Composite substrate capable of emitting light from both sides

technical field

The invention relates to a composite substrate, in particular to a composite substrate capable of emitting light on both sides with a new structure and new material.

Background technique

Field Emission Display (Field Emission Display, FED) is a display that was actively developed around the world around 1980. It is a cathode ray tube (Cathode-Ray Tube, CRT) planar structure. Nowadays, it is pursuing planarization, light weight and high Under the demand of brightness, the field emission display has the potential to be the mainstream of the future market. Its imaging method is similar to the working principle of the cathode ray tube. The cathode emits electrons, accelerates through the vacuum environment and the anode, and hits the phosphor to produce bright light. , and the phosphors used in both the field emission display and the cathode ray tube are also the same material. The only difference is the way the electrons are generated. The electrons generated by the cathode ray tube are generated by heating the cathode, which is called hot cathode electrons (Hot Cathode Electrons); while the field emission display uses an electric field to attract electrons from the cathode, which is called For cold cathode electrons (Cold Cathode Electrons).

As shown in Figure 1, the existing field emission display 1 (FED) is made up of a glass panel 11 and a glass substrate 18, and a plurality of space supports 13 (Spacers) are arranged in the glass panel 11 and the glass substrate 18 , and the space between the glass panel 11 and the glass substrate 18 is a vacuum. A fluorescent layer 12 and electrodes (not shown) are also provided on the glass panel 11, and the glass panel 11 is generally called an anode plate, and its coating technology is similar to that of a cathode ray tube (CRT) or a vacuum fluorescent display (VFD). . And the glass substrate 18 is called cathode plate again, is provided with a cathode 17 on it, is provided with a plurality of emitting tips 16 on this cathode 17, between these two adjacent emitting tips 16 are spaced apart by an insulating layer 15, between the insulating layer 15 A gate 14 is also provided on the top, and the gate 14 is provided with an opening 141 corresponding to the emitter tip 16 .

In a field emission display (FED), the cathode is a field emission array (Field Emission Array, FEA) that can emit electron beams. Unlike the vacuum fluorescent display (VFD), which uses multiple hot lines to form a surface image of the electron source, it is a real two-dimensional distributed surface electron source. The luminescence principle of the field emission display (FED) is to use the electric field to transfer cold electrons from the cathode The material is attracted to the vacuum, and the field emission electrons leaving the cathode plate are attracted by the acceleration of the positive voltage on the anode plate, and collide with the phosphor powder to produce cathode luminescence (Cathodoluminescence).

However, in the field of the existing field emission display (FED), the manufactured displays can only be used for single-sided display, that is, only the side of the glass panel (anode plate) can emit light (transmit light), and The glass substrate (cathode plate) cannot be applied to the backlight source of a double-sided display due to its poor luminous efficiency and/or the opacity of the electrode material and the dielectric layer material.

Contents of the invention

The technical problem to be solved by the present invention is to provide a field emission backlight assembly that emits light from both sides. Used as a backlight module in double-sided displays.

In order to achieve the above object, the field emission backlight assembly of the two-sided luminescence includes: a first light-transmittable substrate, a plurality of light-transmittable first conductors extending in parallel are arranged on one surface, and the first conductors are equidistant from each other. A plurality of emitters are arranged at intervals, and a plurality of second conductors extending in parallel are arranged on the first conductor; a light-transmittable insulating layer is also arranged between the plurality of first conductors and the plurality of second conductors, and the A plurality of first conductors and the plurality of second conductors are arranged perpendicular to each other; a second light-permeable substrate, which is arranged parallel to the first light-transmittable substrate, and on the surface facing the first light-transmissible substrate coating a fluorescent layer; and a plurality of space supports located between the first light-permeable substrate and the second light-transmissible substrate.

Moreover, in order to achieve the above object, the present invention also provides a composite substrate capable of emitting light on both sides, comprising: a first light-transmitting substrate, one surface of which is provided with a plurality of first conductors extending in parallel, and on the first conductors A plurality of emitters are arranged at equidistant intervals, and a plurality of second conductors extending in parallel are also arranged on the first conductor, wherein the plurality of first conductors and the plurality of second conductors are parallel to each other and arranged in a staggered manner; a first conductor Two transparent substrates, which are arranged parallel to the first transparent substrate, and a fluorescent layer is coated on the surface facing the first transparent substrate; and a plurality of space supports, which are located on the first transparent substrate Between the transparent substrate and the second transparent substrate.

Preferably, the transparent first conductor is indium tin oxide.

Preferably, a light-transmissible conductor layer is disposed between the fluorescent layer and the second light-transmissible substrate.

Preferably, the light-permeable conductor layer is indium tin oxide.

Preferably, the coating method of the fluorescent layer is one of screen printing, electrophoresis and lithography.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the cross-sectional view of existing field emission display;

2 is a schematic diagram of a double-sided light-emitting display;

Fig. 3 is a partially enlarged view of Fig. 2, which shows the composite substrate capable of emitting light on both sides;

Fig. 4 is the top view of the cathode and grid arrangement mode of existing field emission assembly; And

FIG. 5 is a top view of the arrangement of the cathode and the grid of the composite substrate capable of emitting light from both sides of the present invention.

【Description of component symbols】

1- Field Emission Display

11-glass panel

12- fluorescent layer

13- Space support

14-Gate

141-opening

15-Insulation layer

16 - launch tip

17 - Cathode

18-glass substrate

2-monitor

21- Upper thin film transistor liquid crystal layer

211-light source

22- Lower thin film transistor liquid crystal layer

221-light source

23-Composite substrate with double-sided light emitting

231-The first transparent substrate

233 - first conductor

2331-Launch Tip

235 - second conductor

237-fluorescent layer

2371-Chodofluorescence

2373-Chodofluorescence

239-Second transparent substrate

301-Block

e-electronic e

Detailed ways

The technical means and effects used by the present invention to achieve the purpose will be described below with reference to the drawings, and the embodiments listed in the following drawings are only for auxiliary illustration, and are not intended to limit the present invention.

FIG. 2 is a schematic diagram of a double-sided light-emitting display. Wherein the display 2 includes an upper thin film transistor liquid crystal layer 21 (TFT Liquid Cell) and a lower thin film transistor liquid crystal layer 22, and the composite substrate 23 capable of emitting light from both sides of the present invention can be arranged on the upper thin film transistor liquid crystal layer 21 and the lower thin film transistor liquid crystal layer The TFT liquid crystal layer 22 serves as a backlight component, so the light source 211 can be provided to the upper TFT liquid crystal layer 21 and the light source 221 can be provided to the lower TFT liquid crystal layer 22 at the same time.

FIG. 3 is a partially enlarged view of FIG. 2 , which shows the composite substrate capable of emitting light from both sides. The composite substrate 23 capable of emitting light from both sides is similar to the structure described in FIG. 1 , however, for the convenience of illustration, some components (such as insulating layers, space supports, etc.) in the composite substrate 23 capable of emitting light on both sides are omitted. In Fig. 3, the first transparent substrate 231 can be made of a transparent material, such as glass, and a plurality of strip-shaped first conductors 233 are arranged on the first transparent substrate 231 (the arrangement will be carried out later. description), the first conductor 233 can be made of conductive materials such as metal or indium tin oxide (ITO), and the first conductor 233 is also provided with a plurality of strip-shaped second conductors 235 (its configuration will also be described later. description), in this structure, the first conductor 233 is used as a cathode (Cathode), and the second conductor 235 is used as a gate (Gate). The first conductor 233 is also provided with a plurality of emission tips 2331. The emission Tip 2331 is a conductor.

A second transparent substrate 239 is arranged parallel to the first transparent substrate 231, and a fluorescent layer 237 is coated on the surface facing the first transparent substrate 231 (below in FIG. 3 ), The coating method of the fluorescent layer 237 can be produced by screen printing, electrophoresis or photolithography. In this structure, a planarized metal film (such as an aluminum film) can also be evaporated on the second light-transmittable substrate 239 or an indium tin oxide (ITO) The thin film is used for conduction (not shown in the figure); and, between the first light-transmissible substrate 231 and the second light-transmissible substrate 239, it is also supported by a plurality of space supports (Spacer) (not shown in the figure). ).

When in action, the double-sided composite substrate is fed with an electric field, so that the electrons e on the first conductor 233 (cathode) will be attracted by the electric field, and will be emitted from the emission tip 2331, and at the same time, leave the first conductor 233 (cathode). The electrons e on the conductor 233 (cathode) will be accelerated by the positive voltage on the second transparent substrate 239 and collide with the fluorescent layer 237 to generate cathode fluorescence 2371 and cathode fluorescence 2373 .

Afterwards, the cathodoluminescence 2371 can pass through the second transparent substrate 239 smoothly to display light patterns. However, in the prior art, since the first conductor 233 as the cathode is mostly made of opaque metal, and because the luminous point (the place where the electron e emits, that is, the junction of the first conductor 233 and the second conductor 235 , that is, the number of junctions between the cathode and the grid) is insufficient, so the cathodoluminescence 2373 is often blocked by the cathode layer or due to insufficient brightness, so that the first light-transmittable substrate 231 cannot display light patterns, and cannot be achieved. The effect of double-sided light.

In the present invention, the first conductor 233 (cathode) and the second conductor 235 (gate) adopt a new configuration, so double-sided light emission can be achieved, as shown in FIG. 4 and FIG. 5 . FIG. 4 is a top view of the arrangement of the cathode and the grid in the conventional field emission device, wherein the first conductor 233 (the cathode) and the second conductor 235 (the grid) are perpendicular to each other. In this configuration, electrons (not shown in the figure) can be emitted only at the contact between the first conductor 233 and the second conductor 235, that is, at the block 301, so that the corresponding fluorescent layer (not shown in the figure) shown) to emit light, so the luminous efficiency of this structure is relatively poor, and in this configuration, an insulating dielectric layer (not shown in the figure) needs to be provided between the first conductor 233 (cathode) and the second conductor 235 (gate). Shows). Therefore, when the first conductor 233 (cathode) and the second conductor 235 (gate) of the present invention adopt such a block-shaped emission source configuration, the first conductor 233 (cathode) needs to be made of a transparent material, such as indium oxide Tin, and the insulating dielectric layer (not shown in the figure) needs to use a material with high light transmittance, so that the cathodoluminescence 2373 can pass through the first conductor 233, so as to achieve the effect of double-sided light emission.

FIG. 5 is a top view of the cathode and grid arrangement of the present invention, wherein the first conductor 233 (cathode) and the second conductor 235 (gate) are parallel to each other and arranged in a staggered arrangement. In this configuration, since the first conductor 233 and the second conductor 235 can be completely cross-connected, the contact area is large, so electrons (not shown in the figure) can be fully emitted, so that the luminous efficiency of the fluorescent layer increases, while in In such a parallel and staggered arrangement, the insulating dielectric layer does not need to be disposed between the first conductor (cathode) and the second conductor (gate). Therefore, when the first conductor 233 (cathode) and the second conductor 235 (grid) of the present invention adopt this configuration, the cathodoluminescence 2373 can pass through the first conductor 233 (cathode) easily, so the first conductor The 233 can be made of traditional metal, of course, the first conductor 233 can also be made of a transparent material (such as indium tin oxide) when better luminous efficiency is desired.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (9)

1. A composite substrate capable of emitting light on both sides, characterized in that it comprises: A first light-permeable substrate, one surface of which is provided with a plurality of light-transmittable first conductors extending in parallel, and a plurality of emitters are arranged at equidistant intervals on the first conductors, and the first conductors are also provided with There are a plurality of second conductors extending in parallel; a light-transmittable insulating layer is also provided between the plurality of first conductors and the plurality of second conductors, and the plurality of first conductors and the plurality of second conductors The conductors are arranged perpendicular to each other; A second light-transmittable substrate, which is arranged parallel to the first light-transmissible substrate, and coated with a fluorescent layer on the surface facing the first light-transmissible substrate; and A plurality of space supports are located between the first transparent substrate and the second transparent substrate. 2 . The composite substrate capable of emitting light from both sides according to claim 1 , wherein the light-transmitting first conductor is made of indium tin oxide. 3 . The composite substrate capable of emitting light from both sides according to claim 1 , wherein a light-permeable conductor layer is disposed between the fluorescent layer and the second light-permeable substrate. 4 . 4 . The composite substrate capable of emitting light from both sides according to claim 3 , wherein the light-permeable conductor layer is made of indium tin oxide. 5 . The composite substrate capable of emitting light on both sides according to claim 1 , wherein the coating method of the fluorescent layer is selected from one of screen printing, electrophoresis and lithography. 6. A composite substrate capable of emitting light on both sides, characterized in that it comprises: A first light-permeable substrate, one surface of which is provided with a plurality of first conductors extending in parallel, a plurality of emitters are arranged at equal intervals on the first conductors, and parallel conductors are also arranged on the first conductors. a plurality of extended second conductors, wherein the plurality of first conductors and the plurality of second conductors are parallel to each other and arranged in a staggered manner; A second light-permeable substrate, which is arranged parallel to the first light-transmittable substrate, and coated with a fluorescent layer on the surface facing the first light-transmissible substrate; and A plurality of space supports are located between the first transparent substrate and the second transparent substrate. 7 . The composite substrate capable of emitting light from both sides according to claim 6 , wherein a light-permeable conductor layer is disposed between the fluorescent layer and the second light-permeable substrate. 7 . 8 . The composite substrate capable of emitting light from both sides according to claim 7 , wherein the light-permeable conductor layer is made of indium tin oxide. 9 . The composite substrate capable of emitting light on both sides according to claim 6 , wherein the coating method of the fluorescent layer is selected from one of screen printing, electrophoresis and lithography.

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