CN101825804B - Liquid crystal display device and backlight control method thereof - Google Patents
Liquid crystal display device and backlight control method thereof Download PDFInfo
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- CN101825804B CN101825804B CN 200910105926 CN200910105926A CN101825804B CN 101825804 B CN101825804 B CN 101825804B CN 200910105926 CN200910105926 CN 200910105926 CN 200910105926 A CN200910105926 A CN 200910105926A CN 101825804 B CN101825804 B CN 101825804B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000011521 glass Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000003086 colorant Substances 0.000 claims description 3
- 238000004020 luminiscence type Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 229940057995 liquid paraffin Drugs 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The invention relates to a liquid crystal display device and a backlight control method thereof. The liquid crystal display device comprises a liquid crystal display panel and a light guide plate which comprises a plurality of light guide strips (101) and is arranged on the back of the liquid crystal display panel, LEDs (102) light-emitting surfaces of which are rightly opposite to the two ends of each light guide strip (101), and an LED control circuit used for controlling the LEDs, wherein the LED control circuit sequentially lights up the LEDs (102) on the two ends of at least two adjacent light guide strips (101) on the back of the scanning line along with the scanning positions of the line scanning signal of line scanning of the liquid crystal display device. The liquid crystal display device and the control method thereof have the beneficial effects that: since the LEDs on the two ends of the adjacent light guide strips of the liquid crystal display device can be sequentially lit up according to the line scanning on the liquid crystal panel, the invention can better achieve brightness uniformity, has notobvious dynamic image blur, high contrast, and technical effect of electricity saving.
Description
Technical field
The present invention relates to field of display, more particularly, relate to a kind of liquid crystal indicator and method for controlling backlight thereof thereof.
Background technology
Existing liquid crystal display illumination mode is divided into side-light type, straight-down negative, hollow type, and light source is based on the cold cathode fluorescent tube illumination, in LED (Light Emitting Diode, light emitting diode) the display illumination technology fast development.In the large scale display application, all more than one of quantity of light source, in order to accomplish that power saving, dynamic image ghost are not obvious, the display effect of high-contrast, so developed that monoblock module backlight is bright usually, LED straight-down negative piecemeal dynamic light adjustment, LED straight-down negative are capable lights scanning light modulation, CCFL (Cold Cathode Fluorescent Lamp, cold cathode fluorescent lamp pipe) straight-down negative rotation sweep light modulation, CCFL straight-down negative in proper order and light back light control schemes such as scanning light modulation in proper order.But prior art exists CCFL at a high speed frequent switch, blocked up, the not high defective of brightness uniformity of downward back optical thickness.
Summary of the invention
One of the technical problem to be solved in the present invention is, at the above-mentioned CCFL of prior art can not at a high speed frequent switch, blocked up, the not high defective of brightness uniformity of downward back optical thickness, a kind of liquid crystal indicator is provided.
Two of the technical problem to be solved in the present invention is, at the above-mentioned CCFL of prior art can not at a high speed frequent switch, blocked up, the not high defective of brightness uniformity of downward back optical thickness, a kind of method for controlling backlight thereof of liquid crystal indicator is provided.
The present invention solves the technical scheme that one of its technical matters adopts: construct a kind of liquid crystal indicator, comprise the LED control circuit that light guide plate, light-emitting area that a plurality of leaded light bars at liquid crystal panel and its back side are formed are right against the LED at each leaded light bar two ends, above-mentioned LED is controlled; Described LED control circuit is sequentially lighted the LED at least 2 adjacent leaded light bar two ends at this scan line back side along with the scanning position of the line scan signals of liquid crystal panel.
In liquid crystal indicator of the present invention, described LED control circuit is lighted the LED at next bar leaded light bar two ends during to axis at the row that are positioned at the leaded light bar in that liquid crystal panel scanning is capable, extinguish the LED at last leaded light bar two ends simultaneously, and described LED control circuit is capable at the row that are positioned at liquid crystal panel during to top and bottom at liquid crystal panel scanning, light the LED at 2 adjacent leaded light bar two ends at this row back side, synchronization always has the LED at 2 leaded light bar two ends to be lighted.
In liquid crystal indicator of the present invention, described LED is white light LEDs, and described LED is that the single-chip excitated fluorescent powder is luminous, or many colors wafer mixed luminescence.
In liquid crystal indicator of the present invention, described leaded light bar is cuboid, its material is organic glass, the LED light-emitting area over against leaded light bar end face be rectangle, leaded light bar length equates with liquid crystal panel scanning is capable, two sides up and down of leaded light bar are coated with full diffuse reflection white ink, the bottom surface of the leaded light bar circular diffuse reflection pattern that diameter does not wait that distributing.
In liquid crystal indicator of the present invention, 1 end face of described leaded light bar has 1 LED at least, and is independently controlled by the LED control circuit.
The present invention solves the technical scheme that two of its technical matters adopts: a kind of method for controlling backlight thereof of liquid crystal indicator is provided, and described liquid crystal indicator comprises the LED control circuit that light guide plate, light-emitting area that a plurality of leaded light bars at liquid crystal panel and its back side are formed are right against the LED at each leaded light bar two ends, above-mentioned LED is controlled; Described control method comprises: the line scan signals with LED control circuit reception liquid crystal panel makes the LED control circuit sequentially light the LED at least 2 leaded light bar two ends at this scan line back side along with the scanning position of the line scan signals of liquid crystal panel.
In the method for the invention, light the LED at next bar leaded light bar two ends during to axis at the capable row that are positioned at the leaded light bar of liquid crystal panel scanning, extinguish the LED at last leaded light bar two ends simultaneously, and at the capable row that are positioned at liquid crystal panel of liquid crystal panel scanning during to top and bottom, light the LED at 2 adjacent leaded light bar two ends at this row back side, synchronization always has the LED at 2 leaded light bar two ends to be lighted.
Implement liquid crystal indicator of the present invention and control method thereof, have following beneficial effect: since the LED at the adjacent leaded light bar two ends of this liquid crystal indicator by the scan line order of liquid crystal panel light, can realize that better brightness uniformity, dynamic image ghost are not obvious, have high-contrast, and have the technique effect of power saving.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is capable 2 the leaded light bars at row its back side during to the top of liquid crystal panel scanning bright synoptic diagram in the liquid crystal indicator of the present invention;
Fig. 2 is capable 2 the leaded light bars at row its back side during to the centre position of liquid crystal panel scanning bright synoptic diagram in the liquid crystal indicator of the present invention;
Fig. 3 is the Liquid Paraffin impression case synoptic diagram of leaded light bar bottom surface in the liquid crystal indicator of the present invention.
Embodiment
Fig. 1 is capable 2 the leaded light bars at row its back side during to the top of liquid crystal panel scanning bright synoptic diagram in the liquid crystal indicator of the present invention.Liquid crystal indicator of the present invention comprises the LED control circuit (succinct for composition, the LED control circuit does not draw among Fig. 1) that light guide plate, light-emitting area that a plurality of leaded light bars 101 at liquid crystal panel and its back side are formed are right against the LED 102 at each leaded light bar two ends, above-mentioned LED 102 is controlled; The LED control circuit is sequentially lighted the LED at least 2 adjacent leaded light bar two ends at this scan line back side along with the scanning position of the line scan signals of liquid crystal panel.Among Fig. 1, the leaded light bar of the LED correspondence of lighting is labeled as 103 (the diagonal line hatches part among Fig. 1 namely is the leaded light bar 103 of two adjacent LED102 correspondences of having lighted).In a preferred embodiment of the invention, above-mentioned LED control circuit is lighted the LED 102 at next bar leaded light bar 101 two ends during to axis at the row that are positioned at leaded light bar 101 in that liquid crystal panel scanning is capable, extinguish the LED 102 at last leaded light bar 101 two ends simultaneously, and described LED control circuit is capable at the row that are positioned at liquid crystal panel during to top and bottom at liquid crystal panel scanning, light the LED 102 at 2 adjacent leaded light bar 101 two ends at this row back side, synchronization always has the LED 102 at 2 leaded light bar 101 two ends to be lighted.
Above-mentioned LED 102 is white light LEDs, and LED is that the single-chip excitated fluorescent powder is luminous, or many colors wafer mixed luminescence.The light-emitting area size of LED 102 is as far as possible little, light efficiency wants the color filter film of height, spectrum and panel close.Leaded light bar 101 is cuboid, its material is organic glass, the LED light-emitting area over against leaded light bar 101 end faces be rectangle, the length of leaded light bar 101 equates with liquid crystal panel scanning is capable, two sides up and down of leaded light bar 101 are coated with full diffuse reflection white ink, the bottom surface of the leaded light bar 101 circular diffuse reflection pattern that diameter does not wait that distributing.After the LED 102 at leaded light bar 101 two ends lights, the light that LED 102 sends namely enters in the leaded light bar 101 by leaded light bar 101 both ends of the surface, after light enters in the leaded light bar 101, by the diffuse reflection mimeograph pattern in the leaded light bar 101, with light equably diffuse reflection to the exiting surface parallel with liquid crystal panel.User oriented that face of liquid crystal panel can send light comparatively uniformly.Above-mentioned a plurality of leaded light bar 101 is formed light guide plate, and undersized white LED light source light-emitting area is right against the two ends of each leaded light bar 101 respectively, the pointolite at two ends can be extended to the line source of liquid crystal panel scanning line direction.During the capable row at panel of liquid crystal panel scanning or bottom during to the top, light the LED 102 at this scan line 2 adjacent leaded light bar 101 two ends behind, liquid crystal panel be listed as to the even brightness zone understand wideer.
1 end face of leaded light bar 101 has 1 LED 102 at least, and is independently controlled by the LED control circuit.Among the present invention, can adopt same principle at expose a plurality of LED 102 at adjacent a plurality of leaded light bars 101 two ends of identical moment point, in the preferred embodiment, always have the LED102 at two leaded light bar 101 two ends to be lighted.
Fig. 2 is capable 2 the leaded light bars at row its back side during to the centre position of liquid crystal panel scanning bright synoptic diagram in the liquid crystal indicator of the present invention.Among Fig. 2, diagonal line hatches partly is exactly the signal of the leaded light bar 103 of two adjacent LED102 correspondences of having lighted.Liquid crystal panel scanning capable at row to the centre position, and light next bar leaded light bar at the row of corresponding leaded light bar during to axis when this scan line, extinguish a last leaded light bar simultaneously, so synchronization has only 2 leaded light bars to light.
Fig. 3 is the Liquid Paraffin impression case synoptic diagram of leaded light bar of the present invention bottom surface.The size of the Liquid Paraffin impression case 104 of leaded light bar 101 bottom surfaces is the circular scatter spots that change along with the size of the LED at distance leaded light bar 101 two ends, is used for outgoing brightness on the homogenize line direction.
Above embodiment has only expressed preferred implementation of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention; Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention; Therefore, all equivalents and modifications of doing with claim scope of the present invention all should belong to the covering scope of claim of the present invention.
Claims (5)
1. liquid crystal indicator, it is characterized in that, comprise that light guide plate, light-emitting area that a plurality of leaded light bars (101) at liquid crystal panel and its back side are formed are right against the LED(102 at each leaded light bar (101) two ends), LED control circuit that described LED is controlled; Described LED control circuit is sequentially lighted the LED(101 at least 2 adjacent leaded light bar (101) two ends at this scan line back side along with the scanning position of the line scan signals of liquid crystal panel);
Described LED control circuit is lighted the LED(102 at next bar leaded light bar (101) two ends during to axis at the row that are positioned at leaded light bar (101) in that liquid crystal panel scanning is capable), extinguish the LED(102 at a last leaded light bar (101) two ends simultaneously), and described LED control circuit is capable at the row that are positioned at liquid crystal panel during to top and bottom at liquid crystal panel scanning, light the LED(102 at 2 adjacent leaded light bars (101) two ends at this scan line back side), synchronization always has the LED(102 at 2 leaded light bars (101) two ends) lighted;
Described leaded light bar (101) is cuboid, its material is organic glass, the LED light-emitting area over against leaded light bar (101) end face be rectangle, leaded light bar (101) length equates with liquid crystal panel scanning is capable, two sides up and down of leaded light bar (101) are coated with full diffuse reflection white ink, the bottom surface of leaded light bar (101) the circular diffuse reflection pattern (104) that diameter does not wait that distributing, described circular diffuse reflection pattern (104) is circular scatter spot, and its size is along with the size of the LED at distance leaded light bar (101) two ends changes.
2. liquid crystal indicator according to claim 1 is characterized in that, described LED(102) be white light LEDs.
3. liquid crystal indicator according to claim 2 is characterized in that, described LED(102) be that the single-chip excitated fluorescent powder is luminous, or many colors wafer mixed luminescence.
4. liquid crystal indicator according to claim 1 is characterized in that, 1 end face of described leaded light bar (101) has 1 LED(102 at least), and independently controlled by the LED control circuit.
5. the method for controlling backlight thereof of a liquid crystal indicator, it is characterized in that described liquid crystal indicator comprises that light guide plate, light-emitting area that a plurality of leaded light bars (101) at liquid crystal panel and its back side are formed are right against the LED(102 at each leaded light bar (101) two ends), to described LED(102) the LED control circuit controlled; Described leaded light bar (101) is cuboid, its material is organic glass, the LED light-emitting area over against leaded light bar (101) end face be rectangle, leaded light bar (101) length equates with liquid crystal panel scanning is capable, two sides up and down of leaded light bar (101) are coated with full diffuse reflection white ink, the bottom surface of leaded light bar (101) the circular diffuse reflection pattern (104) that diameter does not wait that distributing, described circular diffuse reflection pattern (104) is circular scatter spot, and its size is along with the size of the LED at distance leaded light bar (101) two ends changes; Described control method comprises: the line scan signals with LED control circuit reception liquid crystal panel makes the LED control circuit sequentially light the LED(102 at least 2 leaded light bars (101) two ends at this scan line back side along with the scanning position of the line scan signals of liquid crystal panel);
Described control method further comprises: light the LED(102 at next bar leaded light bar (101) two ends during to axis at the capable row that are positioned at leaded light bar (101) of liquid crystal panel scanning), extinguish the LED(102 at a last leaded light bar (101) two ends simultaneously), and at the capable row that are positioned at liquid crystal panel of liquid crystal panel scanning during to top and bottom, light the LED(102 at 2 adjacent leaded light bars (101) two ends at this scan line back side), synchronization has the LED(102 at 2 leaded light bars (101) two ends) lighted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910105926 CN101825804B (en) | 2009-03-03 | 2009-03-03 | Liquid crystal display device and backlight control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910105926 CN101825804B (en) | 2009-03-03 | 2009-03-03 | Liquid crystal display device and backlight control method thereof |
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| CN101825804A CN101825804A (en) | 2010-09-08 |
| CN101825804B true CN101825804B (en) | 2013-08-07 |
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| CN 200910105926 Active CN101825804B (en) | 2009-03-03 | 2009-03-03 | Liquid crystal display device and backlight control method thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103049424B (en) * | 2012-11-22 | 2017-04-19 | 中国电子科技集团公司第四十五研究所 | Method for block scanning of crystal grains |
| CN103885117B (en) | 2014-03-10 | 2018-02-06 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and liquid crystal module |
| CN111487709B (en) * | 2020-05-12 | 2022-03-11 | 合肥通泰光电科技有限公司 | A light guide plate with uniform light output and its lamp |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101097054A (en) * | 2006-06-30 | 2008-01-02 | 株式会社东芝 | Illuminating device and liquid crystal display |
| CN101191905A (en) * | 2006-11-30 | 2008-06-04 | 香港应用科技研究院有限公司 | Light bar, backlight module and display using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007287422A (en) * | 2006-04-14 | 2007-11-01 | Nec Lcd Technologies Ltd | Backlight system, liquid crystal display device, and backlight adjustment method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101097054A (en) * | 2006-06-30 | 2008-01-02 | 株式会社东芝 | Illuminating device and liquid crystal display |
| CN101191905A (en) * | 2006-11-30 | 2008-06-04 | 香港应用科技研究院有限公司 | Light bar, backlight module and display using the same |
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| CN101825804A (en) | 2010-09-08 |
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