CN1453612A - Light-conducting board suitable for LCD - Google Patents
Light-conducting board suitable for LCD Download PDFInfo
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- CN1453612A CN1453612A CN 02118541 CN02118541A CN1453612A CN 1453612 A CN1453612 A CN 1453612A CN 02118541 CN02118541 CN 02118541 CN 02118541 A CN02118541 A CN 02118541A CN 1453612 A CN1453612 A CN 1453612A
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- light
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Abstract
The present invention is one kind of light-conducting board suitable for LCD to increase its brightness. The incident end plane of the light-conducting board adjacent to the light source forms one acute angle to its light-emitting plane and one obtuse angle to its light-reflecting plane. The light-conducting board has increased area of the incident end plane and thus increased light beam from the light source to the light-conducting board and increased brightness of the LCD
Description
Technical field
The present invention relates to a kind of optical plate, particularly a kind ofly change the light-incident end of optical plate and the angle of light emitting surface, and behind the angle of light-incident end and light reflection surface, to increase the optical plate of LCD brightness.
Background technology
Fig. 1 summarily shows a kind of available liquid crystal display.As shown in Figure 1, existing LCD comprises an optical plate 1, and optical plate 1 comprises a light-incident end 1a, a light reflection surface 1c and a light emitting surface 1b.Existing LCD also comprise the light-incident end 1a that is arranged at optical plate 1 a light source 2, be arranged at the light emitting surface 1b of optical plate 1 a scattering device 3, be arranged at a reflecting plate 4 and a liquid crystal panel 5 of the light reflection surface 1c below of optical plate 1.In the prior art, the light emitting surface 1b and the light-incident end 1a of optical plate 1 constitute a right angle, and light reflection surface 1c and light-incident end 1a also constitute a right angle.
Behind light source 2 emission light, light promptly enters in the optical plate 1.In optical plate 1, light enters in the scattering device 3 in the total reflection mode.The light that part is left optical plate can enter in the scattering device 3 by the reflection of reflecting plate 4 again.Then, light is incident in liquid crystal panel 5 equably by this scattering device 3.
In existing LCD,, generally be the aperture opening ratio that increases the luminosity of light source or increase liquid crystal panel if will increase the brightness of LCD.Yet the luminosity that increases light source can make the more heat of LCD generation and influence its quality.In addition, the increase of liquid crystal panel aperture opening ratio also reaches a bottleneck.
Summary of the invention
Therefore, in order to solve the above problems, one object of the present invention is to provide a kind of optical plate; Wherein, the light-incident end of optical plate and light emitting surface constitute an acute angle, reach light-incident end and light reflection surface and constitute an obtuse angle.
Another object of the present invention is to provide a kind of LCD, comprise a liquid crystal panel, a scattering device, an optical plate, a light source and a reflecting plate; Wherein, the light-incident end of optical plate and light emitting surface constitute an acute angle, reach light-incident end and light reflection surface and constitute an obtuse angle.
One of the present invention is characterised in that the light-incident end of above-mentioned optical plate and light emitting surface constitute an acute angle, reaches light-incident end and light reflection surface and constitutes an obtuse angle.
Another feature of the present invention is, increases the area of light-incident end.And then, increase the light beam that light source enters optical plate.
An advantage of the present invention is, uses the LCD of this optical plate can increase brightness.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, an embodiment cited below particularly, and conjunction with figs. are described in detail as follows:
Fig. 1 summarily shows a kind of existing LCD;
Fig. 2 summarily shows optical plate of the present invention; And
Fig. 3 summarily shows the LCD of using optical plate of the present invention.
Description of reference numerals in the accompanying drawing is as follows:
1 optical plate 1a light-incident end
1b light emitting surface 1c light reflection surface
2 light sources, 3 scattering devices
4 reflecting plates, 5 liquid crystal panels
20 light sources, 200 LCD
210 optical plates, 211 light reflection surfaces
212 light emitting surfaces, 213 light-incident ends
220 reflecting plates, 240 scattering devices
241 diffusion sheets, 242 prismatic lenses
243 protective films, 250 liquid crystal panels
θ
1The first angle θ
2Second angle
θ
3Third angle degree θ
nThe angle of total reflection
lighting angle ψ incident angle
Embodiment
Fig. 2 summarily shows optical plate of the present invention.As shown in Figure 2, optical plate 210 of the present invention has a light emitting surface 212, a light reflection surface 211 and a light-incident end 213.Light emitting surface 212 adjoins the liquid crystal panel (not shown), and light reflection surface adjoins a reflecting plate (not shown).Light-incident end 213 constitutes one first angle θ with light emitting surface 212
1, and light-incident end 213 constitutes one second angle θ with light reflection surface 211
2The first angle θ
1Be an acute angle, and the second angle θ
2It is an obtuse angle.
Optical plate is that material is made with propylene (acryl) mostly, and generally speaking, the refractive index of optical plate is about 1.5.According to Si Nieer (Snell) law, light produces the critical angle θ of total reflection at the light reflection surface 211 of optical plate
nBe about 42.15 degree.Therefore, need only light with the angle incident light reflectings surface greater than 42.15 degree, light just can produce total reflection.
In the present invention, the maximum lighting angle that uses light source is 42 degree.With reference to figure 1, from the light of light source 2 emission after light-incident end 1a enters optical plate 1, with incident angle ψ (=90-) the incident light reflecting surface 1c of 48 degree.Yet as long as the angle of incident light reflecting surface 1c is greater than total reflection angle θ=42.15 degree just can produce total reflection, so the incident angle φ and the angle of total reflection θ of existing light beam
nDiffer 5.85 degree.Therefore, in the present invention, light reflection surface 211 and light-incident end 213 suitably constitute 95.85 degree (during 90+90--θ), just can be from the light of light source 20 emissions with the incident angle incident light reflectings surface 211 of approximate 42.15 degree, as shown in Figure 2.In addition, when optical plate of the present invention and existing optical plate have same thickness, the light-incident end area of optical plate of the present invention is bigger than the light-incident end area of existing optical plate, optical plate of the present invention also produces total reflection for the light beam from light source simultaneously, can increase the brightness of LCD.
Fig. 3 summarily shows the LCD of using optical plate of the present invention.As shown in Figure 3, a LCD 200 comprises a liquid crystal panel 250, an optical plate 210, a reflecting plate 220 and a light source 20.One scattering device (diffusingmeans) 240 is set between liquid crystal panel 250 and optical plate 210.Optical plate 210 has a light emitting surface 211, a light reflection surface 212 and a light-incident end 213.Light emitting surface 211 adjoins liquid crystal panel 250, and light reflection surface 212 adjoins reflecting plate 220, and light emitting end face 213 is in the face of light source 20.Light emitting surface 211 and light-incident end 213 constitute the first angle θ of an acute angle
1, and the second angle θ at light reflection surface 212 and light-incident end 213 formations one obtuse angle
2In addition, reflecting plate 220 can enter the light reflection by this light reflection surface 211 in this optical plate 210.
Because the light-incident end area of optical plate of the present invention is bigger than the light-incident end area of existing optical plate, so more light that sends from light source 20 can enter in the optical plate of the present invention.Then, the light that enters optical plate 210 is by optical plate 210, reflecting plate 220 and scattering device 240 irradiating liquid crystal panel 250 equably.At last, send brighter light from liquid crystal panel 250.
In the present invention, above-mentioned scattering device 240 is arranged on the optical plate 210, wherein can comprise a diffusion sheet (diffusing sheet) 241, one prismatic lens (prism sheet) 242 and one protective film (protecting film) 243 successively.Protective film 243 adjoins setting with one second plane 212 of optical plate 210, and diffusion sheet 241 adjoins setting with liquid crystal panel 250.Liquid crystal panel 250 is arranged on the scattering device 240, to form a LCD 200.
Though the present invention by a preferred embodiment openly as above; but it is not in order to limit the present invention; those skilled in the art are under the situation that does not break away from the spirit and scope of the present invention; can do various changes and retouching to it, so protection scope of the present invention is as the criterion with the scope that claims were defined.
Claims (5)
1. optical plate comprises:
One light-incident end, light enters in this optical plate from this light-incident end with the scope that is not more than a maximum lighting angle ;
One light reflection surface, this optical plate have an angle of total reflection θ
n, when above-mentioned light with angle of total reflection θ greater than this optical plate
nDuring this light reflection surface of incident, can reflect above-mentioned light by this light reflection surface; And
One light emitting surface, above-mentioned light is from this light emitting surface emission;
Wherein, above-mentioned light-incident end and above-mentioned light emitting surface constitute one first angle θ
1, above-mentioned light-incident end and above-mentioned light reflection surface constitute one second angle θ
2, this first angle θ
1Be an acute angle and this second angle θ
2Be an obtuse angle, above-mentioned light reflection surface has a normal, and above-mentioned light-incident end and this normal constitute a third angle degree θ
3, this third angle degree θ
3Define by the following relationship formula:
θ
3=90--θ
n, θ
nBe the angle of total reflection of optical plate, is the maximum lighting angle of incident ray.
2. LCD comprises:
One light source, emission has a maximum lighting angle θ
nSet scope light;
One optical plate, have a light emitting surface, a light reflection surface and a light-incident end, and the adjacent setting of this light-incident end with above-mentioned light source, wherein light with set maximum lighting angle be scope in this light-incident end enters this optical plate, this optical plate has an angle of total reflection θ
n, when light with angle of total reflection θ greater than this optical plate
nDuring this light reflection surface of incident, reflect above-mentioned light by this light reflection surface, and by this light emitting surface emission; And
One liquid crystal panel places above-mentioned optical plate top, from the light of above-mentioned light emitting surface by this liquid crystal panel;
Wherein, above-mentioned light-incident end and above-mentioned light emitting surface constitute one first angle θ
1, above-mentioned light-incident end and above-mentioned light reflection surface constitute one second angle θ
2, this first angle θ
1Be an acute angle and this second angle θ
2It is an obtuse angle;
Above-mentioned light reflection surface has a normal, and above-mentioned light-incident end and this normal constitute a third angle degree θ
3, this third angle degree θ
3Defined by the following relationship formula:
θ
3=90--θ
n, θ
nBe the angle of total reflection of optical plate, is the maximum lighting angle of incident ray.
3. LCD as claimed in claim 2 also comprises a reflecting plate, adjoins setting with the light reflection surface of above-mentioned optical plate, will enter in this optical plate by the light reflection of this light reflection surface.
4. LCD as claimed in claim 2 also comprises a scattering device, is arranged between above-mentioned liquid crystal panel and the optical plate.
5. LCD as claimed in claim 2, wherein above-mentioned scattering device comprises a protective film, a prismatic lens, a diffusion sheet successively, wherein above-mentioned protective film is arranged on the above-mentioned optical plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02118541 CN1453612A (en) | 2002-04-27 | 2002-04-27 | Light-conducting board suitable for LCD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02118541 CN1453612A (en) | 2002-04-27 | 2002-04-27 | Light-conducting board suitable for LCD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1453612A true CN1453612A (en) | 2003-11-05 |
Family
ID=29257383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02118541 Pending CN1453612A (en) | 2002-04-27 | 2002-04-27 | Light-conducting board suitable for LCD |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1453612A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619837A (en) * | 2008-07-02 | 2010-01-06 | 景传光电股份有限公司 | Light guide bar with patterned surface to enhance light uniformity and intensity |
| CN102246069A (en) * | 2008-12-16 | 2011-11-16 | 皇家飞利浦电子股份有限公司 | Device for mixing light |
-
2002
- 2002-04-27 CN CN 02118541 patent/CN1453612A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619837A (en) * | 2008-07-02 | 2010-01-06 | 景传光电股份有限公司 | Light guide bar with patterned surface to enhance light uniformity and intensity |
| CN102246069A (en) * | 2008-12-16 | 2011-11-16 | 皇家飞利浦电子股份有限公司 | Device for mixing light |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |