CN2603950Y - Back-light source module of planar display device - Google Patents
Back-light source module of planar display device Download PDFInfo
- Publication number
- CN2603950Y CN2603950Y CNU032015356U CN03201535U CN2603950Y CN 2603950 Y CN2603950 Y CN 2603950Y CN U032015356 U CNU032015356 U CN U032015356U CN 03201535 U CN03201535 U CN 03201535U CN 2603950 Y CN2603950 Y CN 2603950Y
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- light
- flat
- backlight module
- guide plate
- panel screens
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Abstract
A flat panel display back light module to satisfy the purpose to reduce the thickness of the light guide plate, in which a light emitting diode is arranged over the one end of the light guide plate. The utility model comprises: a light guide plate, which has a first part, a second part and a light out plate; a lighting source, which is over the first part; a reflector, which is provided below the light guide plate; a flexible printed circuit board, which is on the side of the lighting source. Most lights emitted from the lighting source goes into the second part through the first part and then is guided out through the light out plate.
Description
Technical field
The utility model is the backlight module that is used for flat-panel screens about a kind of, particularly a kind of backlight module that LED source is placed the flat-panel screens of light guide plate one end top.
Background technology
LCD (liquid crystal display, LCD) be a kind of flat-panel screens that is widely used most at present, has the low consumption electric power, features such as slim light weight and low voltage drive, its displaying principle is to utilize the material behavior of liquid crystal molecule, the ordered state of liquid crystal molecule is changed, cause liquid crystal material to produce various photoelectric effect.Traditional LCD is because numeral that shows or pattern etc., unlike dazzling as the light emitting diode, so visually seem high refined.But the shortcoming of LCD is that itself is not luminous, thus extra light source module need be provided, make when external environment does not have light still can video picture on screen.
(light emitting diode LED), is a kind of low power consumption and light emitting element with high brightness has light stability, the advantage of long service life etc. to light emitting diode.Also therefore be particularly suitable for using in the LCD light source.As shown in Figure 1, shown existing with the structure of light emitting diode 102 as backlight resource module of liquid crystal display 100 light sources.Light is injected light guide plate by light emitting diode 102, and (lightguide plate, LGP) 104 after dispersed uniformly to exiting surface by reflecting plate (reflector sheet) 106.Light guide plate 104, its material be generally organic glass (polymethylmethacrylate, PMMA) or optical plastic (Plastic Division is commonly called as PC material or plastic rubber material), in the titania (TiO that wherein includes 50～80%
2) diffusion grain, its role is to when penetrating and during towards light guide plate 104 surface ejaculations, running into titania (TiO from the light of light emitting diode 102 emissions
2) the diffusion grain can be by scattering more equably.Reflector plate 106 places light guide plate 104 belows, reflects back towards light guide plate 104 once more in order to the light that will penetrate downwards or reflect, so as to improving the brightness of backlight module 100.The bottom surface of light guide plate 104 also can form a plurality of light diffusion elements to promote the homogeneity of light, and light diffusion element can be V-type tangent plane (V-cut) or the site of using print process to form.
In addition, first diffusion sheet (diffuser sheet), 108, one prismatic lenses (prism sheet), 110 and 1 second diffusion sheet 112 is arranged in regular turn above the light guide plate 104, can allow the light homogeneity of sending of light guide plate 104 further promote.Last surface of again light being led the panel of LCD (not shown) via the exiting surface of light guide plate 104, wherein the number of light emitting diode can differently because of the demand of the illumination (Illumination) of LCD change to some extent, and the number of diffusion sheet and prismatic lens also can be different because of the demand of backlight module 100.The top of light emitting diode links a flexible printed wiring board (FPC) 14, and the one end can be electrically connected to the stitch (not shown) of LCD, and the other end can be electrically connected to (not shown) on the system board.
Yet such light source but has many shortcomings.Be not uniformly when at first light enters into light guide plate 104 by light emitting diode 102, as shown in Figure 2.Because light emitting diode 102 is a pointolite, it is limited that its small angle causes dispersing area, therefore the brightness of light guide plate 104 is darker at the A place, and the brightness directly over light emitting diode 102 is brighter, causing significantly, " fluorescence worm phenomenon " produces, this is because use the light source of light emitting diode 102, and it is not due to the real uniform surface light source, has influenced user's visual experience.A kind of mode of solution is the distance shortening with each light emitting diode 102, makes that the area at A place levels off to zero on light guide plate 104.To just under identical light-emitting area, increase the quantity of light emitting diode 102 apart from shortening.But, use the quantity of light emitting diode to increase, do not have any benefit for the reduction of cost.
In addition, the demand that reduces notebook computer thickness now continues to increase, and in the middle of the countermeasure that manufacturer proposed, one is to adopt thinner light guide plate in backlight module.But, because LED source is the side that is arranged at light guide plate, so in the backlight module, the thickness of light guide plate is the size that is subject to LED source light inlet side, when in order to take the illuminometer now of panel of LCD into account, usually can't reduce the thickness of light guide plate, cause the production cost of the panel of the thickness of notebook computer and LCD to reduce.
The utility model content
In view of the aforementioned technical background, the visual angle of the led light source of conventional liquid crystal panel is very little, so that causes the problem of tangible fluorescence worm phenomenon.The utility model provides a kind of backlight module of flat-panel screens, avoids said circumstances to produce.
A purpose of the present utility model is to provide a kind of backlight module of flat-panel screens.Place the particular design of light guide plate one end top by light emitting diode, to solve the problem of fluorescence worm phenomenon.
Another purpose of the present utility model is to provide a kind of backlight module of flat-panel screens.Place the particular design of light guide plate one end top by light emitting diode, to reach the problem that light guide plate reduces that solves.
The purpose of this utility model is achieved in that the backlight module that a kind of flat-panel screens promptly is provided, comprising: a light guide plate has one first position, one second position and an exiting surface; One first reflecting plate places described light guide plate below; And a light source, be positioned at top, described first position, after the most light that penetrated by described light source enter described second position via described first position, derive by described exiting surface again.
According to above-described purpose, the utility model provides a kind of backlight module of flat-panel screens, comprises: a light guide plate has one first position, one second position and an exiting surface; One light source is positioned at this top, first position; One first reflecting plate places this light guide plate below; And a flexible printed wiring board, be positioned at this light source side, after wherein the most light that penetrated by this light source enter this second position via this first position, derive by this exiting surface again.
According to above-mentioned conception, wherein this light source is made up of light emitting diode (LED).
According to above-mentioned conception, wherein the backlight module of flat-panel screens more comprises: one first diffusion sheet is positioned at this light guide plate top; One prismatic lens is positioned at this first diffusion sheet top; And one second diffusion sheet, be positioned at this prismatic lens top.
According to above-mentioned conception, wherein the backlight module of flat-panel screens more comprises one second reflecting plate, is positioned at this light guide plate side.
According to above-mentioned conception, wherein this second position has a plurality of light diffusion elements, and these a plurality of light diffusion elements are to select from following group: V-type tangent plane (V-cut) and site.
According to above-mentioned conception, wherein this first is an inclined surface.
According to above-mentioned conception, wherein this inclined surface be to should light source site having a plurality of light diffusion elements, and these a plurality of light diffusion elements are to select from following group: V-type tangent plane (V-cut) and site.
According to above-mentioned conception, wherein this inclined surface is a plane.
According to above-mentioned conception, wherein this inclined surface is a curved surface.
According to above-mentioned conception, wherein this flat-panel screens is a LCD.
According to above-mentioned conception, wherein the backlight module of flat-panel screens more comprises a flexible printed wiring board, is positioned at this light source side.
Advantage of the present utility model is, because light emitting diode 12 is unlike the side that is arranged at light guide plate 14 as the tradition, so light guide plate 14 thickness of backlight module 10 can reduce, promptly backlight module 10 can adopt thinner light guide plate 14.Help to solve the problem that reduces notebook computer thickness and reduce the panel of LCD production cost.In addition, inclined surface 14 ' can add DIFFUSION TREATMENT at the position of respective leds 12 light sources, as shown in Figure 4, when making the light that penetrates from light emitting diode enter light guide plate 14, can be spread more equably, reduce the generation of " fluorescence worm phenomenon " effectively, the mode of wherein above-mentioned DIFFUSION TREATMENT can be to use the structure of V-arrangement tangent plane or use the site.Be noted that inclined surface 14 ' except can selecting the planar design, also can use curved surface or other to reach and reduce the structure that " fluorescence worm phenomenon " produces effectively.
Description of drawings
The backlight module schematic side view of a kind of traditional flat-panel screens that shown in Figure 1 is;
Look synoptic diagram on the backlight module of a kind of traditional flat-panel screens that shown in Figure 2 is;
Shown in Figure 3 is the backlight module schematic side view of a kind of flat-panel screens of the utility model; And
Look synoptic diagram on the backlight module of the utility model flat-panel screens that shown in Figure 4 is.
Symbol description
100: the backlight module of conventional planar display
10: the backlight module of the utility model flat-panel screens
102,12: light emitting diode
104,14: light guide plate
14 ': inclined surface
106,16: reflecting plate
108,18: the first diffusion sheets
110,20: prismatic lens
112,22: the second diffusion sheets
114,24: flexible printed wiring board
Embodiment
Embodiment more of the present utility model can be described in detail as follows.Yet except describing in detail, the utility model can also be widely implemented at other embodiment, and scope of the present utility model do not limited, its with after claim be as the criterion.
Please refer to Fig. 3, be the schematic side view of the backlight module 10 of a kind of flat-panel screens of preferred embodiment of the present utility model.Light is injected light guide plate (LGP) 14 by light emitting diode (LED) 12 after dispersed uniformly to exiting surface by reflecting plate (reflector sheet) 16.Light guide plate 14, its material be generally organic glass (polymethylmethacrylate, PMMA) or optical plastic (Plastic Division is commonly called as PC material or plastic rubber material), in the titania (TiO that wherein includes 50～80%
2) diffusion grain, its role is to when penetrating and during towards light guide plate 14 surface ejaculations, running into titania (TiO from the light of light emitting diode 12 emissions
2) the diffusion grain can be by scattering more equably.Reflector plate 16 places light guide plate 14 belows, reflects back towards light guide plate 14 once more in order to the light that will penetrate downwards or reflect, so as to improving the brightness of backlight module 10.The bottom surface of light guide plate 14 also can form a plurality of light diffusion elements to promote the homogeneity of light, and light diffusion element can be V-type tangent plane (V-cut) or the site of using print process to form.
In addition, first diffusion sheet (diffuser sheet), 18, one prismatic lenses (prism sheet), 20 and 1 second diffusion sheet 22 is arranged in regular turn above the light guide plate 14, can allow the homogeneity that emits beam of light guide plate 14 further promote.Last surface of again light being led the panel of LCD (not shown) via the exiting surface of light guide plate 14, wherein the number of light emitting diode can differently because of the demand of the illumination (Illumination) of LCD change to some extent, and the number of diffusion sheet and prismatic lens also can be different because of the demand of backlight module 10.The side of light emitting diode links a flexible printed wiring board (FPC) 24, and the one end can be electrically connected to the stitch (not shown) of LCD, and the other end can be electrically connected to (not shown) on the system board.
Preferred embodiment of the present utility model and traditional main difference point be that the side that light emitting diode is positioned at light guide plate by tradition changed to the end top that is positioned at light guide plate and be positioned at light guide plate under the light emitting diode be an inclined surface 14 ', as shown in Figure 3.
Even the utility model is to describe by enumerating a preferred embodiment, but the utility model is not limited to the embodiment that enumerated.Though the specific embodiment of before having enumerated and having narrated, but apparently, other does not break away under the spirit that the utility model discloses, and the equivalence of being finished changes or modifies, and all should be included in the claim of the present utility model.In addition, all other do not break away under the spirit that the utility model discloses, and other that finished are similar and approximate to be changed or modify, and also all is included in the claim of the present utility model.Should explain scope of the present utility model with the widest definition simultaneously, so as to comprising all modifications and similar structures.
Claims (11)
1. the backlight module of a flat-panel screens is characterized in that, comprising: a light guide plate has one first position, one second position and an exiting surface; One first reflecting plate places described light guide plate below; And a light source, be positioned at top, described first position, after the most light that penetrated by described light source enter described second position via described first position, derive by described exiting surface again.
2. the backlight module of flat-panel screens as claimed in claim 1 is characterized in that, described light source is made up of light emitting diode (LED).
3. the backlight module of flat-panel screens as claimed in claim 1 is characterized in that, more comprises:
One first diffusion sheet is positioned at described light guide plate top;
One prismatic lens is positioned at described first diffusion sheet top; And
One second diffusion sheet is positioned at described prism top.
4. the backlight module of flat-panel screens as claimed in claim 1 is characterized in that, described second position has a plurality of light diffusion elements, and described a plurality of light diffusion element is to select from following group: V-type tangent plane (V-cut) and site.
5. the backlight module of flat-panel screens as claimed in claim 1 is characterized in that, described first has an inclined surface.
6. the backlight module of flat-panel screens as claimed in claim 5, it is characterized in that, described inclined surface has a plurality of light diffusion elements in the described light source site of correspondence, and described a plurality of light diffusion element is to select from following group: V-type tangent plane (V-cut) and site.
7. the backlight module of flat-panel screens as claimed in claim 5 is characterized in that, described inclined surface is a plane.
8. the backlight module of flat-panel screens as claimed in claim 5 is characterized in that, described inclined surface is a curved surface.
9. the backlight module of flat-panel screens as claimed in claim 1 is characterized in that, described flat-panel screens is a LCD.
10. the backlight module of flat-panel screens as claimed in claim 1 is characterized in that, more comprises a flexible printed wiring board, is positioned at described light source side.
11. the backlight module of flat-panel screens as claimed in claim 1 is characterized in that, more comprises one second reflecting plate, is positioned at described light guide plate side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032015356U CN2603950Y (en) | 2003-02-17 | 2003-02-17 | Back-light source module of planar display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032015356U CN2603950Y (en) | 2003-02-17 | 2003-02-17 | Back-light source module of planar display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2603950Y true CN2603950Y (en) | 2004-02-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032015356U Expired - Lifetime CN2603950Y (en) | 2003-02-17 | 2003-02-17 | Back-light source module of planar display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2603950Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470263B (en) * | 2007-12-29 | 2011-04-13 | 群康科技(深圳)有限公司 | Electrowetting display device |
-
2003
- 2003-02-17 CN CNU032015356U patent/CN2603950Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470263B (en) * | 2007-12-29 | 2011-04-13 | 群康科技(深圳)有限公司 | Electrowetting display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130217 Granted publication date: 20040218 |