CN102479492A - High-dynamic backlight system of liquid crystal display television - Google Patents
High-dynamic backlight system of liquid crystal display television Download PDFInfo
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- CN102479492A CN102479492A CN2010105621842A CN201010562184A CN102479492A CN 102479492 A CN102479492 A CN 102479492A CN 2010105621842 A CN2010105621842 A CN 2010105621842A CN 201010562184 A CN201010562184 A CN 201010562184A CN 102479492 A CN102479492 A CN 102479492A
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Abstract
The invention provides a high-dynamic backlight system of a liquid crystal display television, which comprises an LED backlight module and a brightness control unit. The LED backlight module is provided with an LED lamp array, optical lenses and a scattering structure, wherein the LED lamp array consisting of a plurality of light-emitting diode light sources is used for providing light of needed wavelength and illuminance, the optical lenses can be infinitely spliced, and each optical lens is provided with a transparent body with a three-dimensional free refraction surface functioning in forming regularly 2N polygonal or rectangular or regularly triangular illuminance distribution after all the light emitted by light-emitting diodes changes directions by means of refraction, wherein N is larger than one. The scattering structure is used for converting uniform illuminance distribution into uniform brightness distribution. The brightness control unit comprises a main control circuit and a driving circuit, wherein the main control circuit is used for generating dynamic backlight control signals, and the driving circuit electrically connected with the main control circuit is used for driving the LED lamp array and connected onto the LED lamp array through a line switch and a row switch on the driving circuit. A driving board of the high-dynamic backlight system is simpler in design, image display quality can be improved, and cost can be remarkably reduced.
Description
Technical field
The present invention relates to lcd technology, be specifically related to the high dynamic backlight of a kind of LCD TV system.
Background technology
LCD is made up of liquid crystal panel and back light unit usually, and generally, back light unit sends constant uniform light and offers liquid crystal panel, then, and the transmittance display image of regulator solution crystal panel pixel cell.Under this display mode, the luminosity of back light unit and institute's images displayed content are irrelevant, no matter be the image of dark or bright image, back light unit is luminous according to high-high brightness all the time.
LED will be applied to the backlight field, must solve many key technical problems, and one of which is the homogeneity of the luminous far-field distribution of LED and the homogeneity question of colour mixture.The index of weighing the backlight quality comprises brightness uniformity and color uniformity.According to the said brightness of preamble definition, guarantee the brightness uniformity in entire backlight source, only need guarantee in the light-emitting area of entire backlight source, the homogeneity of luminous flux in the angle of visibility scope.In backlight design, that scattering mechanism is reduced to everywhere is consistent, lambert's three looks, so a homogeneity that only needs to guarantee three look face place Illumination Distribution gets final product.After the coloured light of different peak wavelengths realized that respectively uniform luminance distributes, the three coloured light flux ratios of regulating light source can satisfy color uniformity, realized the uniform white light light source.In sum, the key point that successfully LED is applied to backlight is to adopt certain packing forms, changes the characteristics of the inhomogeneous intensity distributions of lambert's type that the luminous long-distance distribution of LED had, and makes it realize that in the LCD given area uniform illumination distributes.
The LED packing forms that is applied to backlight at present is mainly by limit emission-type and straight-down negative.The subject matter of limit emission-type backlight is: because LED only plays the part of main officer of Tibet light source role merely, passiveness provides the uniform source of light of constant luminance to LCDs, and image brilliance, contrast and image quality are only controlled by LCDs; For promoting not further help of image contrast, the distribution of image quality GTG level; And no matter how presentation content changes, backlight institute consumed power is changeless; Therefore, there is the big shortcoming of energy loss in emission-type backlight in limit.And there is not above-mentioned shortcoming in direct-light-type backlight, and the straight-down negative encapsulating structure can be realized active dynamic backlight source.
Active dynamic backlight source can be disclosed referring to patent US20060138437A1 " a kind of lens that utilize the symmetry of chanting of refraction mechanism ", and patent US20060268576A1 disclosed " optical system ".But above-mentioned two patented technologies all exist the subregion uneven illumination even, also promptly cause back light source brightness homogeneity and color homogeneity to descend.
So traditional limit emission-type structure is difficult to realize active dynamic backlight source, therefore be difficult to satisfy the demand of following high-definition liquid crystal colour TV image quality and high dynamic-range image, also be difficult to satisfy human society to energy-conservation needs.And the active dynamic backlight source that adopts above-mentioned conventional two-dimensional rotation symmetric lens to realize can not be given full play to the advantage of active dynamic backlight source.
Existing a small amount of LED-based dynamic backlight source technology also occurs, but the quantity of ubiquity chip for driving is too many, the shortcoming that cost is high.
Summary of the invention
The objective of the invention is to overcome weak point of the prior art, the high dynamic backlight of a kind of LCD TV system is provided, backlight of the present invention mechanism has solved conventional two-dimensional rotation symmetric lens in the deficiency that realizes on the active dynamic backlight source from principle; Can be approximately the light that the light emitting diode of electric light source sends and be controlled at lower giving in the scope of shaped through actual mechanism; Through specific arrangement mode, form the straight down active mode dynamic backlight source that evenly just relates to, and; The dynamic backlight control structure that the present invention adopts; Have obvious minimizing chip for driving quantity, thereby effectively reduce the volume of drive plate, and make the design of drive plate simpler; Technical ability is improved image displaying quality, can significantly reduce cost again.
The objective of the invention is to realize through following technical scheme: the high dynamic backlight of LCD TV system comprises that one has luminescence component is used for dynamic backlight control with the LED-backlit module and that light source is provided brightness control unit;
Said LED-backlit module is provided with:
By the LED lamp array that some LED sources are formed, be used to provide the light of necessary wavelength and illumination;
Optical lens can infinitely splice, and has the transparent theme of three free refractive surfaces, and its effect is to make all light that luminous dual-laser sends after superrefraction changes direction, forms the positive 2N limit shape of N＞1 or the Illumination Distribution of rectangle or equilateral triangle;
Diffusing structure is used for that the uniform illumination distribution is converted into uniform luminance and distributes;
Said brightness control unit comprises that one is used to produce the governor circuit of dynamic backlight control signals and the driving circuit that is used for driving LED lamp array that is electrically connected with it, and this driving circuit that is used for driving LED lamp array is connected to LED lamp array through capable switch on it and row switch.
Said driving circuit is PWM ripple IC or speed-sensitive switch IC, and said governor circuit is MPU.
Said capable switch and row switch are connected to that the Combination Control structure comprises that the row switch is consistent closed closed always by the independent control structure of row switch by row independent control structure of switch or row switch on the LED lamp array, and capable switch and row switch mixing control structure are arranged.
The control method of brightness control unit is following among the present invention:
(1) governor circuit receives the pixel data in the picture signal;
(2) calculate the brightness value of each backlight subarea according to the pixel data that receives with this;
(3) governor circuit takes out the brightness maximal value MLD in every row and the every row backlight subarea respectively, and sends to driving circuit;
(4) the capable maximum brightness value of its corresponding row of output of each row switch of driving circuit drives;
(5) the row maximum brightness value of its respective column of output of each row switch of driving circuit drives;
(6) active circuits is compared with expectation subregion brightness value through actual subregion brightness value again, calculates the adjustment COEFFICIENT K;
(7) be adjusted into original 1/K to pixel data doubly.
In the above-mentioned control method, the brightness value of each backlight subarea in the said step (2) is the maximal value in the pixel data of backlight subarea correspondence position for this reason; Expectation subregion brightness value in the said step (6) is the brightness value of each backlight subarea of calculating in the step (2).
The present invention compares that prior art has the following advantages and beneficial effect: backlight of the present invention mechanism has solved conventional two-dimensional rotation symmetric lens in the deficiency that realizes on the active dynamic backlight source from principle; Can be approximately the light that the light emitting diode of electric light source sends and be controlled at lower giving in the scope of shaped through actual mechanism; Through specific arrangement mode, form the straight down active mode dynamic backlight source that evenly just relates to, and; The dynamic backlight control structure that the present invention adopts; Have obvious minimizing chip for driving quantity, thereby effectively reduce the volume of drive plate, and make the design of drive plate simpler; Technical ability is improved image displaying quality, can significantly reduce cost again.
Description of drawings
Fig. 1 is the structural representation of the high dynamic backlight of LCD TV shown in embodiment system;
Fig. 2 is the lens packages structural representation of square Illumination Distribution among the embodiment;
Fig. 3 is the process flow diagram of embodiment control.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiment of the present invention is not limited thereto.
Embodiment
The high dynamic backlight of LCD TV system; Comprise that one has luminescence component is used for dynamic backlight control with the LED-backlit module and that light source is provided brightness control unit; As shown in Figure 1; Said brightness control unit comprises that one is used to produce the governor circuit of dynamic backlight control signals and the driving circuit that is used for driving LED lamp array that is electrically connected with it, and this driving circuit that is used for driving LED lamp array is connected to LED lamp array through capable switch on it and row switch.
As shown in Figure 2, said LED-backlit module comprises light emitting diode 41 and the lens 40 that form the square Illumination Distribution.Luminous and packaged type laser 41 comprises: as directly to use lens 40 to encapsulate; Adopt traditional hemispherical lens encapsulation earlier, cooperate with lens 40 again.The mechanism of action of 40 pairs of light of lens is described below: be positioned at the part 43 of the plane of symmetry 42 in the light that light emitting diode 41 sends, behind superrefraction, just relate to light 44 and slip by in face 42.Light 45 in asymmetric that light emitting diode 41 sends behind superrefraction, just relates to light 46 not necessarily in the plane 48 of symmetry week 47 and light 45 compositions.
In the present embodiment, the light that the use of lens can be sent the light emitting diode of this lens packages is limited in a less zone of giving shaped, therefore can realize active dynamic backlight source.
Said driving circuit is PWM ripple IC or speed-sensitive switch IC, and said governor circuit is MPU.
Said capable switch and row switch are connected to that the Combination Control structure comprises that the row switch is consistent closed closed always by the independent control structure of row switch by row independent control structure of switch or row switch on the LED lamp array, and capable switch and row switch mixing control structure are arranged.
The control method of brightness control unit, as shown in Figure 3, be specially:
(1) road receives the pixel data in the picture signal;
(2) calculate the brightness value of each backlight subarea according to the pixel data that receives with this;
(3) governor circuit takes out the brightness maximal value MLD in every row and the every row backlight subarea respectively, and sends to driving circuit;
(4) the capable maximum brightness value of its corresponding row of output of each row switch of driving circuit drives;
(5) the row maximum brightness value of its respective column of output of each row switch of driving circuit drives;
(6) active circuits is compared with expectation subregion brightness value through actual subregion brightness value again, calculates the adjustment COEFFICIENT K;
(7) be adjusted into original 1/K to pixel data doubly.
In the above-mentioned control method, the brightness value of each backlight subarea in the said step (2) is the maximal value in the pixel data of backlight subarea correspondence position for this reason; Expectation subregion brightness value in the said step (6) is the brightness value of each backlight subarea of calculating in the step (2).
The foregoing description is a preferred implementation of the present invention; But embodiment of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. the high dynamic backlight of LCD TV system is characterized in that: comprise that one has luminescence component is used for dynamic backlight control with the LED-backlit module and that light source is provided brightness control unit;
Said LED-backlit module is provided with:
By the LED lamp array that some LED sources are formed, be used to provide the light of necessary wavelength and illumination;
Optical lens can infinitely splice, and has the transparent theme of three free refractive surfaces, and its effect is to make all light that luminous dual-laser sends after superrefraction changes direction, forms the positive 2N limit shape of N＞1 or the Illumination Distribution of rectangle or equilateral triangle;
Diffusing structure is used for that the uniform illumination distribution is converted into uniform luminance and distributes;
Said brightness control unit comprises that one is used to produce the governor circuit of dynamic backlight control signals and the driving circuit that is used for driving LED lamp array that is electrically connected with it, and this driving circuit that is used for driving LED lamp array is connected to LED lamp array through capable switch on it and row switch.
2. the high dynamic backlight of LCD TV according to claim 1 system is characterized in that:
Said driving circuit is PWM ripple IC or speed-sensitive switch IC, and said governor circuit is MPU.
3. according to the high dynamic backlight of the described LCD TV of claims system, it is characterized in that:
Said capable switch and row switch are connected to that the Combination Control structure comprises that the row switch is consistent closed closed always by the independent control structure of row switch by row independent control structure of switch or row switch on the LED lamp array, and capable switch and row switch mixing control structure are arranged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105621842A CN102479492A (en) | 2010-11-26 | 2010-11-26 | High-dynamic backlight system of liquid crystal display television |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105621842A CN102479492A (en) | 2010-11-26 | 2010-11-26 | High-dynamic backlight system of liquid crystal display television |
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| CN102479492A true CN102479492A (en) | 2012-05-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107191893A (en) * | 2017-07-24 | 2017-09-22 | 深圳市华星光电技术有限公司 | A kind of LED/light source lens and display panel |
| CN108267879A (en) * | 2018-02-11 | 2018-07-10 | 京东方科技集团股份有限公司 | A kind of liquid crystal display die set and display equipment |
| CN108597458A (en) * | 2018-04-26 | 2018-09-28 | 深圳Tcl新技术有限公司 | LOCAL DIMMING backlight drive circuits, Apparatus and liquid crystal display equipment |
| CN111276103A (en) * | 2020-03-26 | 2020-06-12 | 京东方科技集团股份有限公司 | Backlight module, driving method thereof, display module and display device |
-
2010
- 2010-11-26 CN CN2010105621842A patent/CN102479492A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107191893A (en) * | 2017-07-24 | 2017-09-22 | 深圳市华星光电技术有限公司 | A kind of LED/light source lens and display panel |
| CN108267879A (en) * | 2018-02-11 | 2018-07-10 | 京东方科技集团股份有限公司 | A kind of liquid crystal display die set and display equipment |
| CN108267879B (en) * | 2018-02-11 | 2021-02-02 | 京东方科技集团股份有限公司 | Liquid crystal display module and display device |
| CN108597458A (en) * | 2018-04-26 | 2018-09-28 | 深圳Tcl新技术有限公司 | LOCAL DIMMING backlight drive circuits, Apparatus and liquid crystal display equipment |
| CN108597458B (en) * | 2018-04-26 | 2020-12-08 | 深圳Tcl新技术有限公司 | LOCAL DIMMING backlight driving circuit, device and liquid crystal display equipment |
| CN111276103A (en) * | 2020-03-26 | 2020-06-12 | 京东方科技集团股份有限公司 | Backlight module, driving method thereof, display module and display device |
| CN111276103B (en) * | 2020-03-26 | 2021-05-11 | 京东方科技集团股份有限公司 | Backlight module, driving method thereof, display module and display device |
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Application publication date: 20120530 |