CN1542515A - Back light module - Google Patents
Back light module Download PDFInfo
- Publication number
- CN1542515A CN1542515A CNA031243231A CN03124323A CN1542515A CN 1542515 A CN1542515 A CN 1542515A CN A031243231 A CNA031243231 A CN A031243231A CN 03124323 A CN03124323 A CN 03124323A CN 1542515 A CN1542515 A CN 1542515A
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- China
- Prior art keywords
- light
- guide plate
- light guide
- backlight module
- light source
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Abstract
The back light assembly suitable for providing one area light source consists of mainly one light guiding board, one light source, one reflecting hood and one light compensating element. The light source is configured on the side of the light guiding board and the light the light source provides transmits into the light guiding board from its side, passes through its bottom and transmits out of its top. The reflecting hood set beside the light guiding board covers the light source, and the light compensating element is set inside the reflecting hood. By means of the light compensating element inside the reflecting hood or the reflecting planes formed inside the reflecting hood, the brightness in the two corners of the light guiding board near the sides of the lamp is compensated.
Description
Technical field
The utility model relates to a kind of backlight module (Back Light Module), and particularly can effectively compensate the backlight module that light guide plate is adjacent to two corner brightnesses of lamp source two side ends relevant for a kind of.
Background technology
At improving rapidly of multimedia society, be indebted to the tremendous progress of semiconductor element or man-machine display device mostly.With regard to display, (Cathode Ray Tube CRT) because of having excellent display quality and its economy, monopolizes monitor market in recent years to cathode-ray tube (CRT) always.Yet, operate the environment of most terminating machine/display equipments on the table for the individual, or with the incision of the viewpoint of environmental protection, if predicted with the trend of saving the energy, cathode-ray tube (CRT) is because of still existing a lot of problems in space utilization and the energy resource consumption, and can't effectively provide solution for the demand of light, thin, short, little and low consumpting power.Therefore, have that high image quality, space utilization efficient add, (Liquid Crystal Display LCD) becomes the main flow in market to the LCD of low consumpting power, advantageous characteristic such as radiationless gradually.It should be noted that because liquid crystal molecule itself can't be luminous,, make liquid crystal panel reach the effect of demonstration, obtain enough brightness and contrast simultaneously so must provide liquid crystal panel required area source by backlight module.
Fig. 1 is a kind of schematic top plan view of known backlit module.And Fig. 2 is the schematic side view of the backlight module of Fig. 1.Please jointly with reference to Fig. 1 and Fig. 2, backlight module 100 mainly is by a light guide plate 110, a light source 120, a reflex housing 130 and 140 formations of a framework (frame).Wherein, light guide plate 110 for example is a wedge shape light guide plate, and this light guide plate 110 has an end face 112, a bottom surface 114 and a side 116, and wherein, end face 112 is to be designed to exiting surface, and bottom surface 114 is designed to reflecting surface, and side 116 is designed to an incidence surface.Light source 120 for example is a cold cathode fluorescent lamp, this light source 120 is disposed at 116 sides, side of light guide plate 110, and the two ends of light source 120 are fixed on the lamp source holder 150, the light that light source 120 is provided can side 116 incident light guide plate 110 by light guide plate 110 in, and through being passed to end face 112 outgoing of light guide plate 110 behind the bottom surface 114 of light guide plate 110.From as can be known above-mentioned, be the kenel of area source by the light of end face 112 outgoing.Reflex housing 130 is disposed at 116 sides, side of light guide plate 110, to cover light source 120, can concentrate the side 116 that is projected to light guide plate 110 by the light that reflex housing 130 is provided light source 120.In addition, framework 140 is in order to carry above-mentioned light guide plate 110, light source 120 and reflex housing 130, so that light guide plate 110, light source 120 and reflex housing 130 can be integrated.
From the above, because light source 120 uses cold cathode fluorescent lamp (CCFL) mostly at present, and the brightness in the high-low pressure zone at cold cathode fluorescent lamp two ends is usually less than the brightness in stage casing, so can cause light guide plate 110 to be adjacent to the phenomenon of too dark brightness in two corners (the regional A, the B that promptly illustrate among the figure) of lamp source 120 two side ends.Yet, in order to overcome the phenomenon of too dark brightness that light guide plate is adjacent to two corners of lamp source two side ends, known technology increases the length of fluorescent tube usually, the high-low pressure zone of the two ends luminance shortage of fluorescent tube is extended to outside the light guide plate, though so light guide plate can be adjacent to the brightness in two corners of lamp source two side ends promotes, but the width of the LCD left and right sides also certainly will be elongated, and then cause overall volume to increase, and so designs and do not meet light, thin, short, the little development trend of LCD.
The utility model content
Therefore, the purpose of this utility model is providing a kind of backlight module exactly, directly form a plurality of reflectings surface by configuration one optical compensation element in reflex housing or on reflex housing, be adjacent to the brightness in two corners of lamp source two side ends with the compensation light guide plate, and still can satisfy the demand of LCD miniaturization.
Based on above-mentioned purpose, the utility model proposes a kind of backlight module, be suitable for providing an area source, this backlight module is made of a light guide plate, a light source, a reflex housing and an optical compensation element.Wherein, light guide plate has an end face, a bottom surface and at least one side.Light source is disposed at by the side of light guide plate, and the light that light source provided can side incident light guide plate by light guide plate in, and through being passed to the end face outgoing of light guide plate behind the bottom surface of light guide plate.Reflex housing is disposed at by the side of light guide plate, to cover light source.Optical compensation element is disposed in the reflex housing, and optical compensation element has a plurality of reflectings surface, and these a little reflectings surface are adjacent to the brightness in two corners of lamp source two side ends towards the two side ends of light source with the compensation light guide plate.
Based on above-mentioned purpose, the utility model reintroduces a kind of backlight module equally, is suitable for providing an area source, and this backlight module is made of a light guide plate, a light source and a reflex housing.Wherein, light guide plate has an end face, a bottom surface and at least one side.Light source is disposed at by the side of light guide plate, and the light that light source provided can side incident light guide plate by light guide plate in, and through being passed to the end face outgoing of light guide plate behind the bottom surface of light guide plate.Reflex housing is disposed at by the side of light guide plate, and covering light source, and reflex housing has a plurality of reflectings surface, and these a little reflectings surface are adjacent to the brightness in two corners of lamp source two side ends towards the two side ends of light source with the compensation light guide plate.
Described according to preferred embodiment of the present utility model, light guide plate for example is a wedge shape light guide plate, and the bottom surface of light guide plate for example is a step-like surface or for example has a plurality of concave points, and in order to the light scatter that light source provided, and light source for example is a cold cathode fluorescent lamp.
Described according to preferred embodiment of the present utility model, optical compensation element for example is made of one first light conductor and one second light conductor.Wherein, first light conductor is disposed in the reflex housing, and first light conductor has one first reflecting surface, and second light conductor is disposed in the reflex housing, and second light conductor has one second reflecting surface.Towards the two side ends of light source, the brightness that is adjacent to two corners of lamp source two side ends with the compensation light guide plate presents respectively for the first above-mentioned reflecting surface and second reflecting surface.In addition, first reflecting surface and second reflecting surface for example are a step-like surface or have a plurality of concave points.
Described according to preferred embodiment of the present utility model, optical compensation element for example is made of one first reflecting plate and one second reflecting plate.Wherein, first reflecting plate and second reflecting plate are disposed in the reflex housing, and first reflecting plate and second reflecting plate be respectively towards the two side ends of light source, and the brightness that is adjacent to two corners of lamp source two side ends with the compensation light guide plate presents.In addition, first reflecting plate and second reflecting plate for example are a step-like surface or have a plurality of concave points.
Described according to preferred embodiment of the present utility model, for the briliancy of promoting backlight module presents, can further dispose a diffusion sheet and a brightening piece, present embodiment for example can be disposed at a diffusion sheet on the end face of light guide plate, and a brightening piece is disposed on the diffusion sheet.In addition, can be integrated in order to make light guide plate, light source, reflex housing and optical compensation element in the backlight module, for example can use a framework to carry leading tabula rasa, light source, reflex housing and optical compensation element.
From the above, the utility model disposes in reflex housing and directly forms a plurality of reflectings surface on an optical compensation element or the reflex housing, the brightness that is adjacent to two corners of lamp source two side ends in order to the compensation light guide plate presents, make light guide plate that the area source of one uniform luminance can be provided, and still can satisfy the demand of LCD miniaturization.
Description of drawings
Fig. 1 is a kind of schematic top plan view of known backlit module;
Fig. 2 is the schematic side view of the backlight module of Fig. 1;
Fig. 3 is the schematic top plan view according to the backlight module of the utility model first embodiment;
Fig. 4 is the schematic side view of the backlight module of Fig. 3; And
Fig. 5 is the schematic top plan view according to the backlight module of the utility model second embodiment.
100,200,300: backlight module
110,210,310: light guide plate
112,212: end face
114,214: the bottom surface
116,216: the side
120,220,320: light source
130,230,330: reflex housing
140,240: framework
150,250: lamp source holder
260: optical compensation element
332: reflecting surface
Embodiment
First embodiment
Fig. 3 is the schematic top plan view according to the backlight module of the utility model first embodiment.And Fig. 4 is the schematic side view of the backlight module of Fig. 3.Please jointly with reference to Fig. 3 and Fig. 4, backlight module 200 is made of a light guide plate 210, a light source 220, a reflex housing 230, a framework 240 and an optical compensation element 260.Light guide plate 210 for example is a wedge shape light guide plate, this light guide plate 210 has an end face 212, a bottom surface 214 and a side 216, wherein, end face 212 is designed to exiting surface, bottom surface 214 is designed to reflecting surface, for example be a step-like surface or for example have a plurality of concave points that in order to light scatter or the reflection that light source 220 is provided, and side 216 is designed to an incidence surface.
Light source 220 for example is a cold cathode fluorescent lamp, this light source 220 is disposed at 216 sides, side of light guide plate 210, and the two ends of light source 220 are fixed on the lamp source holder 250, the light that light source 220 is provided can side 116 incident light guide plate 210 by light guide plate 210 in, and through being passed to end face 212 outgoing of light guide plate 210 behind the bottom surface 214 of light guide plate 210, from as can be known above-mentioned, be the kenel of area source by the light of end face 212 outgoing.
Reflex housing 230 is disposed at 216 sides, side of light guide plate 210, to cover light source 220, can concentrate the side 216 that is projected to light guide plate 210 by the light that reflex housing 230 is provided light source 120.In addition, can be integrated in order to make light guide plate 210, light source 220, reflex housing 230 and optical compensation element 260 in the backlight module 200, for example can use a framework 240 to carry leading tabula rasa 210, light source 220, reflex housing 230 and optical compensation element 260.
Certainly, for the briliancy of promoting backlight module 200 presents, can further dispose a diffusion sheet 270 and a brightening piece 280.Wherein, diffusion sheet 270 for example is disposed on the end face 212 of light guide plate 210, and brightening piece 280 for example is disposed on the diffusion sheet 270.
It should be noted that, the utility model is disposed at an optical compensation element 260 in the reflex housing 230, this optical compensation element 260 for example is that two light conductors are formed, two light conductors respectively have a reflecting surface 262, this reflecting surface 262 and respectively towards the two side ends of light source 220, and this reflecting surface 262 for example is a step-like surface 262a or for example has a plurality of concave point 262b, in order to the light scatter that light source 220 is provided.Because reflecting surface 262 designs of light conductor are towards the two side ends of light source 220, so light that can the brightness of cold cathode fluorescent lamp stage casing is higher reflection or scatter to two corners (i.e. the zone C that illustrates among the figure, D) that light guide plate 210 is adjacent to lamp source 220 two side ends, to compensate the brightness in this two corner, so, by the area source that the end face 212 of light guide plate 210 is provided, each regional brightness can reach homogenising.Certainly, light conductor of the present utility model does not limit to as Fig. 3 does two, this two light conductor can be integrated into length and the similar solid memder of lamp source 220 length.
In addition, being familiar with this operator should know, optical compensation element of the present utility model can substitute by two reflecting plates (figure does not show), this two reflecting plate also is disposed in the reflex housing and respectively towards the two side ends of light source, and reflecting plate for example is a step-like surface or for example has a plurality of concave points, with with the light scatter that light source was provided, and can reach the brightness that the compensation light guide plate is adjacent to two corners of lamp source two side ends equally.
Second embodiment
Fig. 5 is the schematic top plan view according to the backlight module of the utility model second embodiment.See also Fig. 5, the structure and first embodiment of backlight module 300 integral body are roughly the same, it is identical to be in this and promptly not to give unnecessary details, and do not exist together on reflex housing 330, directly forming a plurality of reflectings surface 332, to replace the optical compensation element among first embodiment, these a little reflectings surface 332 are also respectively towards the two side ends of light source 320, and reflecting surface 332 for example is a step-like surface (figure does not show) or for example has a plurality of concave points (figure does not show), with the light scatter that light source 320 is provided, and can reach two corners (the i.e. area E that illustrates among the figure that compensation light guide plate 310 is adjacent to lamp source 320 two side ends equally, F) brightness.
In sum, backlight module of the present utility model has following advantages at least:
1. backlight module of the present utility model can compensate LGP and be adjacent to two of lamp source two side ends The brightness in corner, the area source that the end face by LGP is provided, its each regional brightness can Reach homogenising.
2. backlight module of the present utility model is adjacent to lamp source two side ends except promoting LGP Outside the brightness in two corners, can't increase the volume of backlight module integral body, and still can tie up Hold liquid crystal display and have frivolous, short and small characteristic.
Claims (14)
1. a backlight module is suitable for providing an area source, it is characterized in that, this backlight module comprises:
One light guide plate has an end face, a bottom surface and at least one side;
One light source is disposed at by this side of this light guide plate, and wherein the light that this light source provided can be by this this light guide plate of side incident, and is passed to this end face outgoing through behind this bottom surface;
One reflex housing is disposed at by this side of this light guide plate, to cover this light source; And
One optical compensation element is disposed in this reflex housing, and wherein this optical compensation element has a plurality of reflectings surface, and those reflectings surface are towards the two side ends of this light source, to compensate the brightness that this light guide plate is adjacent to two corners of this lamp source two side ends.
2. backlight module as claimed in claim 1 is characterized in that, this optical compensation element comprises:
One first light conductor is disposed in this reflex housing, and this first light conductor has one first reflecting surface; And
One second light conductor, be disposed in this reflex housing, and this first light conductor has one second reflecting surface, and wherein this first reflecting surface and this second reflecting surface are respectively towards the two side ends of this light source, to compensate the brightness that this light guide plate is adjacent to two corners of this lamp source two side ends.
3. backlight module as claimed in claim 2 is characterized in that, this first reflecting surface and this second reflecting surface are a step-like surface.
4. backlight module as claimed in claim 2 is characterized in that, has a plurality of concave points on this first reflecting surface and this second reflecting surface.
5. backlight module as claimed in claim 1 is characterized in that, this optical compensation element comprises:
One first reflecting plate is disposed in this reflex housing; And
One second reflecting plate is disposed in this reflex housing, and wherein this first reflecting surface and this second reflecting surface are respectively towards the two side ends of this light source, to compensate the brightness that this light guide plate is adjacent to two corners of this lamp source two side ends.
6. backlight module as claimed in claim 5 is characterized in that, this first reflecting plate and this second reflecting plate have a step-like surface.
7. backlight module as claimed in claim 5 is characterized in that, has a plurality of concave points on this first reflecting plate and this second reflecting plate.
8. backlight module as claimed in claim 1 is characterized in that, more comprises a framework, and this framework can carry this light guide plate, this light source, this reflex housing and this optical compensation element.
9. backlight module as claimed in claim 1 is characterized in that, more comprises a diffusion sheet and a brightening piece, and wherein this diffusion sheet is disposed on this end face of this light guide plate, and this brightening piece is disposed on this diffusion sheet.
10. a backlight module is suitable for providing an area source, it is characterized in that, this backlight module comprises:
One light guide plate has an end face, a bottom surface and at least one side;
One light source is disposed at by this side of this light guide plate, and wherein the light that this light source provided can be by this this light guide plate of side incident, and is passed to this end face outgoing through behind this bottom surface; And
One reflex housing is disposed at by this side of this light guide plate, and to cover this light source, wherein this reflex housing has a plurality of reflectings surface, and those reflectings surface are towards the two side ends of this light source, to compensate the brightness that this light guide plate is adjacent to two corners of this lamp source two side ends.
11. backlight module as claimed in claim 10 is characterized in that, those reflectings surface are a step-like surface.
12. backlight module as claimed in claim 10 is characterized in that, those reflectings surface have a plurality of concave points.
13. backlight module as claimed in claim 10 is characterized in that, more comprises a framework, more comprises a framework, this framework can carry this light guide plate, this light source, this reflex housing and this optical compensation element.
14. backlight module as claimed in claim 10 is characterized in that, more comprises a diffusion sheet and a brightening piece, wherein this diffusion sheet is disposed on this end face of this light guide plate, and this brightening piece is disposed on this diffusion sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03124323 CN1285958C (en) | 2003-04-29 | 2003-04-29 | Back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03124323 CN1285958C (en) | 2003-04-29 | 2003-04-29 | Back light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1542515A true CN1542515A (en) | 2004-11-03 |
| CN1285958C CN1285958C (en) | 2006-11-22 |
Family
ID=34321650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03124323 Expired - Fee Related CN1285958C (en) | 2003-04-29 | 2003-04-29 | Back light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1285958C (en) |
-
2003
- 2003-04-29 CN CN 03124323 patent/CN1285958C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1285958C (en) | 2006-11-22 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061122 Termination date: 20160429 |