JP3674849B2 - High efficiency display front panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a display front panel used for various phosphor light-emitting devices such as thin film electroluminescence, and is mounted as a front panel of the device. The present invention relates to a high-efficiency display front panel that can significantly reduce the total reflection loss caused by the difference in the refractive index of the display and suppress the decrease in luminance.
[0002]
[Prior art]
In various displays such as thin film electroluminescence (hereinafter referred to as EL) and fluorescent display tubes currently used, the light emitter is made to emit electrons or electroluminescence, and the emitted light is sent to the human field of view through the face surface. .
[0003]
However, due to the difference in refractive index between the glass constituting the face surface and air, only about 20% of the light emitted from the light emitter reaches the human field of view, and the remaining 80% of the light is emitted from the face. The light was scattered from the glass forming the surface and the like, and the light from the light emitter was not efficiently conducted.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a high-efficiency display front panel that can be used for various displays and can be taken out without reducing the luminance of light from a light emitter.
[0005]
[Means for Solving the Problems]
A high-efficiency display front panel according to claim 1 of the present invention for solving the above-mentioned problems has a substrate to be a first layer, a refractive index n ₂ smaller than a refractive index n _{1 of the} substrate, A second layer formed alternately adjacent to the first layer at a predetermined pitch; an RGB light emitter arranged in parallel on one surface of the first layer; and provided on the other surface of the first layer. A high-efficiency display front panel comprising a non-reflective film, wherein a plurality of convex portions are integrally formed on the substrate, and the RGB light emitters are provided on the front end surfaces of the convex portions, respectively. The formed concave portion is the second layer. Light from the RGB light emitter is reduced from one surface of the first layer due to a total reflection loss caused by a difference in refractive index from the second layer. Light emission can be taken out without causing it.
According to such a configuration, light can be extracted from the other surface of the substrate serving as the face surface without reducing the luminance of the light from the RGB light emitters provided on the one surface of the substrate. In addition, the substrate can be formed by a molding method such as a LIGA process or mold molding.
[0006]
A high-efficiency display front panel according to a second aspect is the high-efficiency display front panel according to the first aspect, wherein the substrate is formed of a resin, and the first layer and the second layer are formed with a pitch width of 100 μm or less. is there.
According to such a configuration, the display resolution of the display can be increased. Moreover, it can reduce reliably that the brightness | luminance of a display falls.
[0009]
A high-efficiency display front panel according to a third aspect is the high-efficiency display front panel according to the first or second aspect , wherein the second layer is filled with air or a resin having a refractive index equivalent to that of air.
According to such a configuration, the structure of the display itself can be simplified.
[0012]
Further, the high-efficiency display front panel according to claim 8 is the front panel according to any one of claims 1 to 7, wherein a non-reflective coating film is laminated on the face surface having micro unevenness on the face surface, and the viewing angle is reduced. Adjustment and prevention of external light reflection are performed.
According to such a configuration, it is possible to give a light diffusion effect by adding minute irregularities to the face surface, and it is possible to adjust the orientation angle of light extracted from the surface of the display, and to arbitrarily adjust the viewing angle. Can be expanded to any angle. For this reason, the high-efficiency display front panel according to the present invention causes most of the light to travel only in the vertical direction from the phosphor screen by the role of the light guide as in the tube described above, and the directivity becomes too strong. It is possible to prevent the viewing angle from becoming too narrow. In addition, a transparent thin film with a different refractive index is laminated on the face surface to form a non-reflective coating to prevent external light reflection, and high contrast visibility that is not affected by the location of the display. An excellent display can be obtained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of a high-efficiency display front panel according to the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view of a high-efficiency display front panel according to this embodiment.
[0014]
As shown in FIG. 1, a high-efficiency display front panel 1 according to this embodiment includes a substrate 2 having a refractive index n ₁ having a plurality of convex portions 3 provided at a predetermined pitch, and a front end surface of the convex portion 3. The RGB light emitters 7a, 7b, and 7c provided on the surface and the non-reflective coating film 9 provided on the other surface serving as the face surface.
[0015]
The substrate 2 serving as the first layer is formed of a polyimide resin or the like having a refractive index n ₁ in the range of 1.6 to 2.0. As shown in FIG. 1, the substrate 2 has a plurality of convex portions 3 formed at a predetermined pitch.
[0016]
The convex portion 3 can be processed by LIGA process using X-rays or the like, or by making it into a semi-molten state in a mold and press molding while applying high frequency or ultrasonic waves. By these methods, the plurality of convex portions 3 can be processed at a time with a width pitch of 100 μm or less. Thus, since the convex part 3 is provided by the width | variety pitch of 100 micrometers or less, the display resolution of a display can be improved. Moreover, it can reduce reliably that the brightness | luminance of a display falls. The convex portion 3 may have a circular cross section or a rectangular shape.
[0017]
An ITO electrode 6 is provided at the tip of each convex portion 3. Then, RGB light emitters 7a, 7b, 7c are arranged in parallel on the ITO electrodes 6. An electrode 10 is further provided on the surface of the RGB light emitters 7a, 7b, and 7c. As shown in FIG. 1, the ITO electrode 6 and the electrode 10 may be provided on each convex portion 3 or may be provided so as to straddle each convex portion 3 with a single plate. good.
[0018]
As shown in FIG. 1, the high-efficiency display front panel 1 according to the present embodiment has a plurality of convex portions 3 formed on a substrate 2 serving as a first layer. Concave portions 5 are continuously formed in the convex portions 3 respectively. This recess 5 becomes the second layer. The recess 5 serving as the second layer may have a refractive index n ₂ smaller than the refractive index n ₁ of the substrate 2 serving as the first layer, and may be air or a resin having a refractive index equivalent to air. Good.
[0019]
Further, the non-reflective film 9 formed on the other surface, which is the face surface of the substrate 2 as the first layer, is preferably one in which a non-reflective coating film is laminated on the surface subjected to micro-order concavo-convex treatment. . As a result, the luminance from the RGB light emitters 7a, 7b, 7c provided at the tips of the respective convex portions 3 of the substrate 2 is increased, and the light with enhanced directivity can be diffused at a required angle on the face surface. It becomes possible to widen the viewing angle by a necessary amount, and to prevent a decrease in contrast due to external light by the non-reflective coating film, thereby improving visibility.
[0020]
The high-efficiency display front panel 1 according to the present embodiment has such a configuration, and the RGB light emitters 7a, 7b, and 7c provided at the tips of the convex portions 3 that are one side of the substrate 2. Since the refractive index n ₁ of each convex part 3 is larger than the refractive index n ₂ of the concave part 5 adjacent to these convex parts 3, the light emitted from the other part of the substrate 2 which is the face surface inside the convex part 3 Go straight to the surface. For this reason, the light emitted from each of the RGB light emitters 7a, 7b, and 7c is efficiently extracted from the face surface without being scattered by the substrate 2. Moreover, since this convex part 3 is formed with the pitch width of 100 micrometers or less, it can be set as the display with high display resolution.
[0021]
Next, reference example 1 of the high- efficiency display front panel will be described with reference to FIG. 2, the same members as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0022]
As shown in FIG. 2, a high-efficiency display front panel 1 according to this reference example has a substrate 2 having a refractive index n ₁ and a plurality of through holes 4 formed at a predetermined pitch with a pitch width of 100 μm or less on one surface. An ITO electrode 6 is provided, and RGB light emitters 7a, 7b, and 7c are provided on the surface of the ITO electrode 6 coaxially with the substrate 2, respectively. The through hole 4 is the second layer. The inside of the through hole 4 serving as the second layer may be a refractive index n ₂ smaller than the refractive index n ₁ of the substrate 2 serving as the first layer, and may be air or a resin having a refractive index equivalent to that of air. I just need it.
[0023]
Thus, since each RGB emitters 7a, 7b, 7c are provided on the large substrate 2 and coaxially of the refractive index, the light emitting respective RGB emitters 7a, 7b, from 7c is scattered by board 2 Without being removed from the face surface. Moreover, since each through-hole 4 is formed with a pitch width of 100 μm or less, a display having high display resolution can be obtained.
[0024]
Next, Reference Example 2 of the high- efficiency display front panel will be described with reference to FIG. In FIG. 3, the same members as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0025]
As shown in FIG. 3, the high-efficiency display front panel 1 according to this embodiment has a plurality of thin-walled tubes 11 embedded in a substrate 2 having a refractive index n ₁ at a predetermined pitch with a pitch width of 100 μm or less. An ITO electrode 6 is provided on this surface, and RGB light emitters 7 a, 7 b, and 7 c are provided on the surface of the ITO electrode 6, coaxially with the substrate 2, and projected on the inner diameter portion of each tube 11. In addition, each pipe | tube 11 becomes a 2nd layer. The tube 11 serving as the second layer may have a refractive index n ₂ smaller than the refractive index n ₁ of the substrate 2 serving as the first layer, and is preferably a metal such as aluminum. As a result, the tube 11 functions as a light guide, and light from each of the RGB light emitters 7a, 7b, 7c is not scattered in the substrate 2 but goes straight toward the face surface which is the other surface. To come.
[0026]
Thus, since the RGB light emitters 7a, 7b, 7c are provided coaxially with the substrate 2 having a large refractive index, the light emitted from the RGB light emitters 7a, 7b, 7c is as shown in FIG. As with the high-efficiency display front panel 1 of Reference Example 1 shown, the substrate 2 can be efficiently taken out from the face surface without being scattered. Moreover, since this pipe | tube 11 is embed | buried with the pitch width of 100 micrometers or less, it can be set as the display with high display resolution. The tube 11 may have a circular or rectangular cross section.
[0027]
As described above, the high-efficiency display front panel according to the present invention increases the directivity of light from the light emitter provided on one surface of the substrate from the other surface of the substrate serving as the face surface, and further increases the luminance. Can be taken out efficiently. Further, the non-reflective coating film provided on the face surface enhances visibility, and can be used for displays used in various phosphor light emitting devices such as thin film electroluminescence. In addition, it is not limited to the above embodiment example of this invention.
[0028]
【The invention's effect】
The high-efficiency display front panel according to the present invention can extract light without lowering the luminance, and has an effect that it can be used as a face surface of various displays.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first exemplary embodiment of a high efficiency display front panel according to the present invention.
FIG. 2 is a cross-sectional view of Reference Example 1 of the high-efficiency display front panel.
FIG. 3 is a cross-sectional view of Reference Example 2 of the high-efficiency display front panel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High-efficiency display front panel 2 Substrate 3 Convex part 4 Through-hole 5 Concave part 6 ITO electrode 7a, 7b, 7c Luminescent body 9 Non-reflective coating film 10 Electrode 11 Tube

Claims (4)

A first layer, a _second layer having a refractive index n ₂ smaller than the refractive index n _{1 of the} substrate, and formed adjacent to the first layer alternately at a predetermined pitch; A high-efficiency display front panel comprising: RGB light emitters arranged side by side on one side of the layer; and an antireflective film provided on the other side of the first layer,
A plurality of convex portions are integrally formed on the substrate, and the RGB light emitters are provided on the tip surfaces of the convex portions, respectively.
The recess formed in the substrate is the second layer.
High-efficiency display front panel that can extract light from the RGB light emitter from one surface of the first layer without causing a decrease in luminance due to a total reflection loss caused by a difference in refractive index from the second layer .   The high-efficiency display front panel according to claim 1, wherein the substrate is made of resin, and the first layer and the second layer are formed with a pitch width of 100 μm or less. The high-efficiency display front panel according to claim 1 or 2 , wherein the second layer is filled with air or a resin having a refractive index equivalent to that of air. The face antireflection coating film on a surface having minute unevenness of micro order is stacked, high-efficiency according to claims 1 to adjust the external light anti-reflection of the field angle is made in any one of 3 Display front panel.

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