CN101673521A - Liquid crystal display device and method for processing digital image signal - Google Patents
Liquid crystal display device and method for processing digital image signal Download PDFInfo
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Abstract
The invention discloses a liquid crystal display device comprising a decoding module, a time sequence control module, a liquid crystal drive module, a backlight drive module, a liquid crystal displaypanel and an LED backlight module. The liquid crystal display device is characterized by further comprising a dynamic backlight control module. The invention further discloses a method for processinga digital image signal of a liquid crystal display adjusting device. The invention adopts a method for independently controlling backlight subareas to be capable of reducing or even closing the backlight at parts with darker pictures and really darkening the backlight, so as to improve the picture contrast ratio and change the backlight brightness according to the change of the pictures by independently controlling the backlight subareas, thus reducing power consumption.
Description
Technical field
The present invention relates to field of liquid crystal display, in particular use the liquid crystal indicator of LED-backlit, and the digital image signal process aiming method.
Background technology
In display, cathode ray tube (CRT) was once once occupying the whole market, but because the restriction on its weight and the size can't be satisfied miniaturization of electronic products and light-weighted trend, the small and exquisite display device of a kind of volume of current needs substitutes CRT monitor.Afterwards along with research to display technique, LCD (LCD) is advantage such as little, in light weight and low-power consumption with its volume, can realize substituting the Presentation Function of CRT, along with further investigation to LCD, be widely used in the display terminals such as flat-panel monitor and PC, and market is rising tendency year by year to the demand of LCD.
Because LCD is passive demonstration, itself is not irradiative, needs a back light unit and shines the LCD panel, comes display image by the light that sees through, so back light unit of LCD needs shows usefulness as its light source for image.
Present LCD is backlight to mainly contain two types of cold cathode fluorescent lamp (CCFL) and light emitting diodes (LED).
The CCFL main flow that once becoming backlight is simply praised highly with its technology with low cost.But its, short rapid wear had inborn deficiency in color rendition in serviceable life, was difficult to satisfy high-quality image display requirement, and CCFL contains the mercury metal huge to environmental hazard, had put into effect the numerous restrictions to the product that contains mercury all over the world successively; LED-backlit is arisen at the historic moment for this reason.Relatively traditional C CFL is backlight, adopts LED to be LCD backlight, and color representation power is stronger, and its color rendition scope can reach 105% of NTSC, is much better than CCFL 70%～85% performance level backlight, accomplishes wide colour gamut easilier.Can reach 100,000 hours the serviceable life of LED in addition, be better than 80,000 hours of CCFL half bright state.And more simple in circuit design, saved the required inversion high-tension circuit of CCFL, structure is simpler.Based on above plurality of advantages, make present LED replace CCFL gradually, be widely used in LCD backlight.
The liquid crystal indicator that a kind of LED-backlit occurred, backlight illumination is wherein fixed, and can not adjust according to the liquid crystal display content change.Even and liquid crystal is 0 o'clock in gray level, its transmissivity does not reach 0 yet.Therefore, always some light can see through liquid crystal, and light leakage phenomena promptly takes place, and causes local not enough " secretly " that liquid crystal display picture should " secretly ", has reduced the demonstration contrast; Simultaneously, most of light of backlight is stopped by liquid crystal, has reduced utilization factor backlight, has produced extra energy consumption.
Therefore, there is defective in prior art, needs to improve.
Summary of the invention
Technical matters to be solved by this invention is at the deficiencies in the prior art, a kind of liquid crystal indicator at first is provided, the liquid crystal indicator that provides a kind of LED of use can dynamically adjust according to the liquid crystal display content change as the brightness of backlight and this LED-backlit further is provided, digital image signal process aiming method in a kind of liquid crystal indicator also is provided at last.
Technical scheme of the present invention is as follows:
A kind of liquid crystal indicator comprises decoder module, time-sequence control module, liquid crystal driver module, liquid crystal panel, backlight drive module and LED-backlit module, also comprises the dynamic backlight control module; Described dynamic backlight control module is connected with described decoder module, described backlight drive module, described time-sequence control module respectively, be used to receive data image signal, according to pre-seting regular zoning, the described data image signal of subregion analyzing and processing, dynamically adjust backlight brightness data and liquid crystal greyscale data according to analysis processing result, adjust the back backlight brightness data and adjust back liquid crystal greyscale data to described backlight drive module and the output of described time-sequence control module respectively; Described backlight drive module is connected with described LED-backlit module, is used for according to adjusting the described LED-backlit module of back backlight illumination data-driven luminous; Described time-sequence control module is connected with described liquid crystal driver module, is used for producing timing control signal according to adjusting back liquid crystal greyscale data, is delivered to described liquid crystal driver module, drives described liquid crystal panel display message by it according to described timing control signal.
Described liquid crystal indicator, described dynamic backlight control module and described decoder module are wholely set.
Described liquid crystal indicator, described dynamic backlight control module comprises: picture signal receives module, image buffer storage module, image analysis module, backlight illumination computing module, Distribution calculation module backlight, liquid crystal greyscale adjusting module; Described picture signal receives module and is connected with described decoder module, described image buffer storage module, described image analysis module respectively, be used to receive data image signal, and output to described image buffer storage module and described image analysis module respectively from described decoder module; Described image analysis module is connected with described backlight illumination computing module, is used to receive described data image signal, and according to pre-seting regular zoning, analyzing and processing is carried out in the subregion, obtains analysis processing result, is sent to described backlight illumination computing module; Described backlight illumination computing module also is connected with described backlight drive module, described Distribution calculation module backlight respectively, be used for according to described analysis processing result, calculate backlight illumination initial value, backlight illumination end value and backlight drive value, described backlight illumination end value is sent to described Distribution calculation module backlight, described backlight drive value as adjusting the back backlight brightness data, is sent to described backlight drive module; Described Distribution calculation module backlight also is connected with described liquid crystal greyscale adjusting module, is used for calculating described backlight illumination distributed intelligence according to described backlight illumination end value, sends to described liquid crystal greyscale adjusting module; Described image buffer storage module also is connected with described liquid crystal greyscale adjusting module, is used for receiving and the described data image signal of buffer memory, sends to described liquid crystal greyscale adjusting module; Described liquid crystal greyscale adjusting module also is connected with described time-sequence control module, be used for according to described backlight illumination distributed intelligence, adjust the liquid crystal greyscale data in the described data image signal, obtain adjusting back liquid crystal greyscale data, send to described time-sequence control module.
Described liquid crystal indicator, described image analysis module comprise mean value unit and the sample variance unit that connects in turn; Described mean value unit is used to receive described data image signal, and the original gray value of all pixels is added up in the subregion, sends to described sample variance unit; And calculate the average gray Ai of all pixels in each zone, export described average gray Ai to described backlight illumination computing module; Described sample variance unit is used for calculating sample variance Vi according to the original gray value in each zone, exports described sample variance Vi to described backlight illumination computing module; Described backlight illumination computing module is used for according to described average gray Ai and described sample variance Vi, calculates backlight illumination initial value, backlight illumination end value and backlight drive value.
Described liquid crystal indicator, described backlight illumination computing module comprise backlight illumination initial value computing unit, backlight illumination end value computing unit and the backlight drive value computing unit that connects in turn; Described backlight illumination initial value computing unit is used for calculating the backlight illumination initial value according to formula Li=a0 * Ai+a1 * Vi+a2; Wherein Li is the backlight illumination initial value, and Ai is described average gray, a0, a1, a2 be greater than 0 less than 1 scope in preset parameters; Described backlight illumination end value computing unit is used for judging according to default decision logic the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin, exports described backlight illumination end value L ' i according to judged result and gives described Distribution calculation module backlight; Described backlight drive value computing unit is used for calculating the backlight drive value according to formula Ti=L ' i * Base, exports to described backlight drive module, and wherein Ti is the backlight drive value, and Base is less than 1 default backlight illumination reference value greater than 0.
Described liquid crystal indicator, described backlight illumination end value computing unit comprises judgment sub-unit and the output subelement that connects in turn, described judgment sub-unit is used for judging according to default decision logic the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin, described output subelement is used for exporting described backlight illumination end value L ' i according to judged result, described default decision logic is: if Li＞Lmax, then described output subelement output L ' i=Lmax; If Li＜Lmin, then described output subelement output L ' i=Lmin; If Lmin≤Li≤Lmax, then described output subelement output L ' i=Li, wherein 0≤Lmin＜Lmax≤1.
A kind of data image signal disposal route that is applied to above-mentioned liquid crystal indicator may further comprise the steps: A1, the described data image signal of buffer memory; A2, described data image signal subregion is analyzed; A3, according to described analysis processing result, calculate backlight illumination initial value, backlight illumination end value and backlight drive value, obtain adjusted backlight brightness data, the driving LED backlight module is luminous; A4, calculate described backlight illumination distributed intelligence according to described backlight illumination end value, for example, according to preset LED Luminance Distribution model and each regional backlight illumination end value,, obtain described backlight illumination distributed intelligence to the calculating that superposes of described each regional backlight illumination end value; A5, according to described backlight illumination distributed intelligence, adjust the liquid crystal greyscale data, produce timing control signal according to adjusting back liquid crystal greyscale data, drive the liquid crystal panel display message.
Described method, described steps A 2 specifically may further comprise the steps: A21, described data image signal subregion added up the original gray value of all pixels, and the average gray Ai and the output of calculating all pixels in each zone, for example, export described average gray Ai to described backlight illumination computing unit; A22, the original gray value in each zone is calculated sample variance Vi and output, for example, export described sample variance Vi to described backlight illumination computing unit.
Described method, described steps A 3 is specifically carried out following operation: A31, is calculated the backlight illumination initial value according to formula Li=a0 * Ai+a1 * Vi+a2, wherein Li is the backlight illumination initial value, Ai is described average gray, a0, a1, a2 be greater than 0 less than 1 scope in preset parameters; A32, judge the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin, export described backlight illumination end value L ' i to described Distribution calculation module backlight according to judged result according to the first default decision logic; A33: calculate the backlight drive value according to formula Ti=L ' i * Base, export to described backlight drive module, wherein Ti is the backlight drive value, and Base is less than 1 default backlight illumination reference value greater than 0.
Described method before the described steps A 31, is also carried out following steps A301, steps A 302 or steps A 303; A301, pre-set parameter a0, a1 and a2; A302, pre-set the described first default decision logic; For example, the described first default decision logic is: if Li＞Lmax, then L ' i=Lmax; If Li＜Lmin, then L ' i=Lmin; If Lmin≤Li≤Lmax, then L ' i=Li, wherein 0≤Lmin＜Lmax≤1; A303, pre-set B parameter ase.
Described method, operation below described steps A 5 concrete execution the: use formula G ' i=Gi/BLi to calculate the initial gray-scale value of each pixel in each zone, wherein Gi is the original gray value of each pixel in each zone, and BLi is the backlight illumination distribution value of each pixel correspondence, 0＜BLi＜1; Determine the final gray-scale value of each pixel according to pre-seting decision logic two; For example, described second pre-sets decision logic two is: if G ' i＞255, then G " i=255, otherwise G " i=G ' i, wherein G " i is the final gray-scale value of each pixel.
Adopt such scheme, the present invention is by carrying out statistical study with data image signal according to the subregion, position that it shows on liquid crystal panel, liquid crystal greyscale and backlight illumination are dynamically adjusted, in the darker zone of displaying contents, increase the transmissivity of liquid crystal, reduce backlight illumination simultaneously, reaching increases the demonstration contrast, improve utilization factor backlight, reduce the purpose of power consumption.
Description of drawings
Fig. 1 is the synoptic diagram of prior art;
Fig. 2 is the structural representation of the embodiment of the invention 1;
Fig. 3 is the structural representation of the embodiment of the invention 2;
Fig. 4 is the structural representation of the embodiment of the invention 3;
Fig. 5 is the structural representation of the embodiment of the invention 4;
Fig. 6 is the process flow diagram of the embodiment of the invention 6;
Fig. 7-1 is that the present invention uses the stack computing method to calculate the synoptic diagram of LED-backlit Luminance Distribution to 7-3.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
Present embodiment provides a kind of liquid crystal indicator, comprise decoder module 99, time-sequence control module 100, liquid crystal driver module 104, backlight drive module 108, liquid crystal panel 105 and LED-backlit module 109, the annexation and the function of above-mentioned decoder module 99, time-sequence control module 100, liquid crystal driver module 104, backlight drive module 108, liquid crystal panel 105 and LED-backlit module 109 belong to prior art, do not repeat them here, following emphasis is described dynamic backlight control module 10.
Dynamic backlight control module 10 is connected with decoder module 99, certainly, also dynamic backlight control module 10 can be integrated in the decoder module 99, shown in the frame of broken lines among Fig. 2 in order to reduce cost, that is, dynamic backlight control module 10 is wholely set with decoder module 99.
Need to prove, the any particular algorithms that the dynamic method of adjusting backlight brightness data and liquid crystal greyscale data can adopt the technician to know calculates, dynamic backlight control module 10 is respectively to backlight drive module 108 and time-sequence control module 100 adjusted backlight brightness data of output and adjusted liquid crystal greyscale data, time-sequence control module 100 is connected with liquid crystal driver module 104, be used for producing the corresponding time sequence control signal, and pass to liquid crystal driver module 104 according to adjusted liquid crystal greyscale data.
Described backlight drive module 108 is connected with described LED-backlit module 109, and it is luminous to be used for driving described LED-backlit module 109 according to adjusted backlight brightness data, illuminates liquid crystal panel 105; Described liquid crystal driver module 104 drives described liquid crystal panel 105 display message according to described timing control signal.
Embodiment 2
Present embodiment provides a kind of liquid crystal indicator, on the basis of embodiment 1, present embodiment has carried out optimal design to dynamic backlight control module 10, and dynamic backlight control module 10 comprises: picture signal receives module, image buffer storage module, image analysis module, backlight illumination computing module, Distribution calculation module backlight, liquid crystal greyscale adjusting module.As shown in Figure 3, liquid crystal indicator comprises: picture signal receives module 101, image buffer storage module 102, liquid crystal greyscale adjusting module 103, liquid crystal driver module 104, liquid crystal panel 105, image analysis module 106, backlight illumination computing module 107, backlight drive module 108, LED-backlit module 109, Distribution calculation module 110 backlight.
Picture signal receives module 101 and is connected with decoder module, image buffer storage module 102, image analysis module 106 respectively, be used to receive data image signal, provide data image signal to image buffer storage module 102 and image analysis module 106 from described decoder module.
Image buffer storage module 102 is connected with liquid crystal greyscale adjusting module 103, is used for receiving and the buffer memory data image signal, and the brilliant gray scale adjusting module 103 of feed flow is adjusted liquid crystal greyscale and used.
Backlight illumination computing module 107 is connected with image analysis module 106, backlight drive module 108 and Distribution calculation module 110 backlight respectively, be used for according to analysis processing result, calculate backlight brightness data, backlight brightness data comprises backlight illumination initial value, backlight illumination end value and backlight drive value, the backlight illumination end value is sent to Distribution calculation module 110 backlight, with the backlight drive value as adjusting the back backlight brightness data, send to backlight drive module 108, drive connected LED-backlit module 109 according to the backlight drive value by backlight drive module 108.
Like this, by the method that adopts the backlight subarea territory independently to control, can reduce even close backlight in the part of picture " darker ", its real " secretly " is got off, thereby the raising picture contrast, simultaneously, by subregion backlight is independently controlled, backlight illumination is changed according to image content, reduced power consumption.
Embodiment 3
On the basis of embodiment 2, preferably, present embodiment further is provided with mean value unit 1061 and the sample variance unit 1062 that connects in turn in described image analysis module, as shown in Figure 4, described mean value unit 1061 is used to receive described data image signal, the original gray value of all pixels is added up in described data image signal subregion, send to described sample variance unit; And, mean value unit 1061 is also according to the original gray value of all pixels, calculate the average gray Ai of all pixels in each zone, export described average gray Ai to described backlight illumination computing module, original gray value in 1062 pairs of each zones, described sample variance unit is calculated sample variance Vi, to the described sample variance Vi of described backlight illumination computing module 107 outputs, according to described average gray Ai and described sample variance Vi, calculate backlight illumination initial value, backlight illumination end value and backlight drive value by described backlight illumination computing module.
Subregion statistical sample mean value and sample got variance like this, the data that obtain are more accurate.
Embodiment 4
On the basis of embodiment 3, preferably, present embodiment further is provided with backlight illumination initial value computing unit 1071, backlight illumination end value computing unit 1072 and the backlight drive value computing unit 1073 that connects in turn in described backlight illumination computing module 107, as shown in Figure 5, described backlight illumination initial value computing unit 1071 is used for calculating the backlight illumination initial value according to formula Li=a0 * Ai+a1 * Vi+a2, wherein Li is the backlight illumination initial value, Ai is described average gray, a0, a1, a2 be greater than 0 less than 1 scope in preset parameters; Described backlight illumination end value computing unit is used for judging according to default decision logic the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin, exports described backlight illumination end value L ' i according to judged result and gives Distribution calculation module 110 backlight; Described backlight drive value computing unit is used for calculating the backlight drive value according to formula Ti=L ' i * Base, export to described backlight drive module 108, wherein Ti is the backlight drive value, Base is default backlight illumination reference value, above-mentioned backlight illumination reference value can also can be provided by decoder module 99 by independent user input device input.Adopt above-mentioned algorithm to determine backlight brightness values, both considered the integral brightness level (mean value) of image in the zone, consider the details (variance) of image in the zone again, and can the result of calculation to backlight brightness values not produce bigger change and cause scintillation because of the subtle change (such as noise) of image in the zone.
For example, described backlight illumination end value computing unit comprises judgment sub-unit and the output subelement that connects in turn, described judgment sub-unit is used for judging according to default decision logic the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin, described output subelement is used for exporting described backlight illumination end value L ' i according to judged result, described default decision logic is: if Li＞Lmax, then described output subelement output L ' i=Lmax; If Li＜Lmin, then described output subelement output L ' i=Lmin; If Lmin≤Li≤Lmax, then described output subelement output L ' i=Li, wherein 0≤Lmin＜Lmax≤1.
Embodiment 5
Present embodiment provides a kind of data image signal disposal route that is applied to the various embodiments described above, and it may further comprise the steps.
A1: the described data image signal of buffer memory; Can adopt independent storer to carry out this step.
A2: described data image signal subregion is analyzed; For example, specifically may further comprise the steps: A21, the original gray value of all pixels is added up in described data image signal subregion, and calculate the average gray Ai of all pixels in each zone, export described average gray Ai to described backlight illumination computing unit; A22, the original gray value in each zone is calculated sample variance Vi, export described sample variance Vi to described backlight illumination computing unit.
A3: according to described analysis processing result, calculate backlight illumination initial value, backlight illumination end value and backlight drive value, obtain adjusted backlight brightness data, the driving LED backlight module is luminous; For example, when analysis processing result has Ai and Vi, specifically carry out following operation: A31, calculate the backlight illumination initial value according to formula Li=a0 * Ai+a1 * Vi+a2, wherein Li is the backlight illumination initial value, Ai is described average gray, a0, a1, a2 be greater than 0 less than 1 scope in preset parameters; A32, judge the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin, export described backlight illumination end value L ' i to described Distribution calculation module backlight according to judged result according to the first default decision logic; A33, calculate the backlight drive value according to formula Ti=L ' i * Base, export to described backlight drive module, wherein Ti is the backlight drive value, and Base is less than 1 default backlight illumination reference value greater than 0.
For example, backlight drive module 108 is connected with LED-backlit module 109, and it is luminous to drive described LED-backlit module 109 according to adjusted backlight brightness data.
Another example is, before the steps A 31, can also carry out following one or more step, and, do not limit the execution sequence of the following step.A301, pre-set parameter a0, a1 and a2; For example, a0 is 0.1,0.22,0.34,0.46,0.53,0.666,0.789,0.8123 or 0.99999 or the like; A1 is 0.11,0.222,0.334,0.461,0.503,0.616,0.7789,0.8023 or 0.99999 or the like; A2 is 0.1,0.22,0.34,0.46,0.53,0.666,0.789,0.8123,0.11,0.222,0.334,0.461,0.503,0.616,0.7789,0.8023 or 0.99999 or the like; A302, pre-set the described first default decision logic; For example, the described first default decision logic is: if Li＞Lmax, then L ' i=Lmax; If Li＜Lmin, then L ' i=Lmin; If Lmin≤Li≤Lmax, then L ' i=Li, wherein 0≤Lmin＜Lmax≤1; A303, pre-set B parameter ase, for example, Base is 0.1,0.22,0.34,0.46,0.53,0.666,0.789,0.8123 or 0.99999 or the like.
A4: calculate described backlight illumination distributed intelligence according to described backlight illumination end value; For example, according to preset LED Luminance Distribution model and each regional backlight illumination end value,, obtain described backlight illumination distributed intelligence to the calculating that superposes of described each regional backlight illumination end value.
A5: according to described backlight illumination distributed intelligence, adjust the liquid crystal greyscale data, obtain adjusted liquid crystal greyscale data, produce timing control signal, drive the liquid crystal panel display message according to adjusting back liquid crystal greyscale data; For example, be connected with liquid crystal driver module by an above-mentioned time-sequence control module, produce timing control signal according to adjusting back liquid crystal greyscale data, be delivered to described liquid crystal driver module, drive described liquid crystal panel display message according to described timing control signal by described liquid crystal driver module.For example, operation below concrete execution the: use formula G ' i=Gi/BLi to calculate the initial gray-scale value G ' i of each pixel in each zone, wherein Gi is the original gray value of each pixel in each zone, and BLi is the backlight illumination distribution value of each pixel correspondence, 0＜BLi＜1; Determine the final gray-scale value of each pixel according to pre-seting decision logic two; For example, described second pre-sets decision logic two is: if G ' i＞255, then G " i=255, otherwise G " i=G ' i, wherein G " i is the final gray-scale value of each pixel.
For example, time-sequence control module 100 is connected with liquid crystal driver module 104, be used for producing timing control signal according to adjusted liquid crystal greyscale data, be delivered to described liquid crystal driver module 104, drive described liquid crystal panel 105 display message according to described timing control signal by described liquid crystal driver module 104.
Embodiment 6
Present embodiment provides a kind of data image signal disposal route that is applied to the various embodiments described above, and as shown in Figure 6, this method may further comprise the steps: A1: the described data image signal of buffer memory; A2: described data image signal subregion is analyzed, preferably, operation below described steps A 2 concrete execution the: A21: the original gray value of described data image signal subregion being added up all pixels, and calculate the average gray Ai of all pixels in each zone, export described average gray Ai to described backlight illumination computing unit; A22: the original gray value in each zone is calculated sample variance Vi, export described sample variance Vi to described backlight illumination computing unit; For example, data image signal can be carried out subregion according to the rectangle of 4 * 4 pixels, table 1 is the original gray value (for convenience of description, the gray-scale value to pixel has all carried out normalized) of one of them subregion Q:
| ??0.63 | ??0.38 | ??0.45 | ??0.87 |
| ??0.99 | ??0.78 | ??0.11 | ??0.54 |
| ??0.54 | ??0.98 | ??0.99 | ??0.20 |
| ??0.46 | ??0.86 | ??0.95 | ??0.50 |
Table 1
The average gray that calculates all pixels in the subregion Q obtains Ai=0.6394, the original gray value in the subregion Q is calculated sample variance obtain Vi=0.0767.
A3: according to described analysis processing result, calculate backlight illumination, preferably, described steps A 3 concrete following operation: the A31 of execution: calculate the backlight illumination initial value according to formula Li=a0 * Ai+a1 * Vi+a2, wherein Li is the backlight illumination initial value, Ai is described average gray, a0, a1, a2 be greater than 0 less than 1 scope in preset parameters; A32: judge the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin according to presetting decision logic, export described backlight illumination end value L ' i according to judged result.Default decision logic is described in the described steps A 32: if Li＞Lmax, then L ' i=Lmax; If Li＜Lmin, then L ' i=Lmin; If Lmin≤Li≤Lmax, then L ' i=Li, wherein 0≤Lmin＜Lmax≤1; Also the Q subregion with table 1 correspondence is an example, preestablish a0=0.4, a1=0.4, a2=0.6, Lmax=1, Lmin=0.7 calculates Li=0.8864 with above-mentioned parameter and Ai=0.6394, Vi=0.0767 substitution formula Li=a0 * Ai+a1 * Vi+a2, Lmin≤0.8864≤Lmax, so the backlight illumination end value L ' i=0.8864 of Q subregion correspondence; A33: calculate the backlight drive value according to formula Ti=L ' i * Base, export to described backlight drive module, wherein Ti is the backlight drive value, Base is default backlight illumination reference value, its span is between 0 to 1, for example, be example with Base=0.6, calculate according to above-mentioned formula and can get Ti=L ' i * Base=0.8864 * 0.6=0.5184.
A4: calculate described backlight illumination according to described backlight illumination end value and distribute, preferably, operation below described steps A 4 concrete execution the: according to preset LED Luminance Distribution model and each regional backlight illumination end value L ' i, to described each regional backlight illumination end value L ' i calculating that superposes, obtain described backlight illumination and distribute; Now be calculated as the principle of example explanation said method with the Luminance Distribution of two LED lamps, default LED Luminance Distribution model is as shown in table 2:
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.001 | ??0.001 | ??0.001 | ??0.001 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.001 | ??0.006 | ??0.012 | ??0.012 | ??0.006 | ??0.001 | ??0.000 | ??0.000 |
| ??0.000 | ??0.001 | ??0.006 | ??0.027 | ??0.059 | ??0.059 | ??0.027 | ??0.006 | ??0.001 | ??0.000 |
| ??0.000 | ??0.001 | ??0.012 | ??0.059 | ??0.131 | ??0.131 | ??0.059 | ??0.012 | ??0.001 | ??0.000 |
| ??0.000 | ??0.001 | ??0.012 | ??0.059 | ??0.131 | ??0.131 | ??0.059 | ??0.012 | ??0.001 | ??0.000 |
| ??0.000 | ??0.001 | ??0.006 | ??0.027 | ??0.059 | ??0.059 | ??0.027 | ??0.006 | ??0.001 | ??0.000 |
| ??0.000 | ??0.000 | ??0.001 | ??0.006 | ??0.012 | ??0.012 | ??0.006 | ??0.001 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.001 | ??0.001 | ??0.001 | ??0.001 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
Table 2
Table 2 is LED lamp luminescence distribution models when brightness is the highest, this model is the size of 10 * 10 statistical units of LED lamp periphery, suppose two LED lamps, LED1 and LED2, the brightness of LED1 is 0.9, be depicted as the Luminance Distribution synoptic diagram of LED1 as Fig. 7-1, X-axis and Y-axis are the planimetric position coordinate of LED1 in backlight module among the figure, the Z axle is the Luminance Distribution of LED1, the brightness of LED2 is 0.7, Fig. 7-2 is the Luminance Distribution synoptic diagram of LED2, and LED1 distance above LED2 is the position of " 2 " individual statistical unit, and the LED1 Luminance Distribution equals LED Luminance Distribution model and multiply by 0.9 Luminance Distribution that obtains the LED1 shown in the table 3.
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.001 | ??0.001 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.001 | ??0.005 | ??0.011 | ??0.011 | ??0.005 | ??0.001 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.005 | ??0.024 | ??0.053 | ??0.053 | ??0.024 | ??0.005 | ??0.000 | ??0.000 |
| ??0.000 | ??0.001 | ??0.011 | ??0.053 | ??0.118 | ??0.118 | ??0.053 | ??0.011 | ??0.001 | ??0.000 |
| ??0.000 | ??0.001 | ??0.011 | ??0.053 | ??0.118 | ??0.118 | ??0.053 | ??0.011 | ??0.001 | ??0.000 |
| ??0.000 | ??0.000 | ??0.005 | ??0.024 | ??0.053 | ??0.053 | ??0.024 | ??0.005 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.001 | ??0.005 | ??0.011 | ??0.011 | ??0.005 | ??0.001 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.001 | ??0.001 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
Table 3
The brightness of LED2 equals LED Luminance Distribution model and multiply by 0.7 Luminance Distribution that obtains the LED2 shown in the table 4.
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.001 | ??0.001 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.001 | ??0.004 | ??0.009 | ??0.009 | ??0.004 | ??0.001 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.004 | ??0.019 | ??0.041 | ??0.041 | ??0.019 | ??0.004 | ??0.000 | ??0.000 |
| ??0.000 | ??0.001 | ??0.009 | ??0.041 | ??0.091 | ??0.091 | ??0.041 | ??0.009 | ??0.001 | ??0.000 |
| ??0.000 | ??0.001 | ??0.009 | ??0.041 | ??0.091 | ??0.091 | ??0.041 | ??0.009 | ??0.001 | ??0.000 |
| ??0.000 | ??0.000 | ??0.004 | ??0.019 | ??0.041 | ??0.041 | ??0.019 | ??0.004 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.001 | ??0.004 | ??0.009 | ??0.009 | ??0.004 | ??0.001 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.001 | ??0.001 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
Table 4
Because LED1 and LED2 differ the position of " 2 " individual statistical unit, so LED1 and LED2 also should differ " 2 " individual statistical unit and superpose in stack, be the 3rd line data of LED1 and superimposed the 3rd line data that obtains table 5 of the 1st line data of LED2, superimposed the 4th line data that obtains table 5 of the 4th line data of LED1 and the 2nd line data of LED2, obtain other each line data in the table 5 by that analogy, the Luminance Distribution stack result of LED1 and LED2 two lamps is as shown in table 5, and Fig. 7-3 has also illustrated the Luminance Distribution synoptic diagram after LED1 and the LED2 stack.
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.001 | ??0.001 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.001 | ??0.005 | ??0.011 | ??0.011 | ??0.005 | ??0.001 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.005 | ??0.025 | ??0.054 | ??0.054 | ??0.025 | ??0.005 | ??0.000 | ??0.000 |
| ??0.000 | ??0.001 | ??0.012 | ??0.057 | ??0.126 | ??0.126 | ??0.057 | ??0.012 | ??0.001 | ??0.000 |
| ??0.000 | ??0.001 | ??0.015 | ??0.072 | ??0.159 | ??0.159 | ??0.072 | ??0.015 | ??0.001 | ??0.000 |
| ??0.000 | ??0.001 | ??0.014 | ??0.066 | ??0.145 | ??0.145 | ??0.066 | ??0.014 | ??0.001 | ??0.000 |
| ??0.000 | ??0.001 | ??0.010 | ??0.046 | ??0.102 | ??0.102 | ??0.046 | ??0.010 | ??0.001 | ??0.000 |
| ??0.000 | ??0.000 | ??0.004 | ??0.019 | ??0.043 | ??0.043 | ??0.019 | ??0.004 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.001 | ??0.004 | ??0.009 | ??0.009 | ??0.004 | ??0.001 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.001 | ??0.001 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
| ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 | ??0.000 |
Table 5
According to above-mentioned principle, all brightness of LED lamps calculating that superpose in the LED-backlit module 109 finally can be obtained the Luminance Distribution of LED-backlit.
A5: distribute according to described backlight illumination, adjust the liquid crystal greyscale data, preferably, operation below described steps A 5 concrete execution the: use formula G ' i=Gi/BLi to calculate the initial gray-scale value of each pixel in each zone, wherein Gi is the original gray value of each pixel in each zone, BLi is the backlight illumination distribution value of each pixel correspondence, 0＜BLi＜1; Determine the final gray-scale value of each pixel according to pre-seting decision logic two, if the described decision logic two that pre-sets is for G ' i＞255, then G " i=255, otherwise G " i=G ' i, wherein G " i is the final gray-scale value of each pixel.
Adopt said method processing digital images signal, carry out subregion and each subregion is independently controlled backlight, can reduce even close backlight in the part of picture " darker ", its real " secretly " is got off, thereby raising picture contrast, by subregion backlight is independently controlled, backlight illumination is changed according to image content simultaneously, reduced power consumption.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (10)
1, a kind of liquid crystal indicator comprises decoder module, time-sequence control module, liquid crystal driver module, liquid crystal panel, backlight drive module and LED-backlit module, it is characterized in that, also comprises the dynamic backlight control module;
Described dynamic backlight control module is connected with described decoder module, described backlight drive module, described time-sequence control module respectively, be used to receive data image signal, according to pre-seting regular zoning, the described data image signal of subregion analyzing and processing, dynamically adjust backlight brightness data and liquid crystal greyscale data according to analysis processing result, adjust the back backlight brightness data and adjust back liquid crystal greyscale data to described backlight drive module and the output of described time-sequence control module respectively;
Described backlight drive module is connected with described LED-backlit module, is used for according to adjusting the described LED-backlit module of back backlight illumination data-driven luminous;
Described time-sequence control module is connected with described liquid crystal driver module, is used for producing timing control signal according to adjusting back liquid crystal greyscale data, is delivered to described liquid crystal driver module, drives described liquid crystal panel display message by it according to described timing control signal.
2, liquid crystal indicator according to claim 1 is characterized in that, described dynamic backlight control module and described decoder module are wholely set; Perhaps,
Described dynamic backlight control module comprises: picture signal receives module, image buffer storage module, image analysis module, backlight illumination computing module, Distribution calculation module backlight, liquid crystal greyscale adjusting module;
Described picture signal receives module and is connected with described decoder module, described image buffer storage module, described image analysis module respectively, be used to receive data image signal, and output to described image buffer storage module and described image analysis module respectively from described decoder module;
Described image analysis module is connected with described backlight illumination computing module, is used to receive described data image signal, and according to pre-seting regular zoning, analyzing and processing is carried out in the subregion, obtains analysis processing result, is sent to described backlight illumination computing module;
Described backlight illumination computing module also is connected with described backlight drive module, described Distribution calculation module backlight respectively, be used for according to described analysis processing result, calculate backlight illumination initial value, backlight illumination end value and backlight drive value, described backlight illumination end value is sent to described Distribution calculation module backlight, described backlight drive value as adjusting the back backlight brightness data, is sent to described backlight drive module;
Described Distribution calculation module backlight also is connected with described liquid crystal greyscale adjusting module, is used for calculating the backlight illumination distributed intelligence according to described backlight illumination end value, sends to described liquid crystal greyscale adjusting module;
Described image buffer storage module also is connected with described liquid crystal greyscale adjusting module, is used for receiving and the described data image signal of buffer memory, sends to described liquid crystal greyscale adjusting module;
Described liquid crystal greyscale adjusting module also is connected with described time-sequence control module, be used for according to described backlight illumination distributed intelligence, adjust the liquid crystal greyscale data in the described data image signal, obtain adjusting back liquid crystal greyscale data, send to described time-sequence control module.
3, liquid crystal indicator according to claim 2 is characterized in that, described image analysis module comprises mean value unit and the sample variance unit that connects in turn;
Described mean value unit is used to receive described data image signal, and the original gray value of all pixels is added up in the subregion, sends to described sample variance unit; And calculate the average gray Ai of all pixels in each zone, export described average gray Ai to described backlight illumination computing module;
Described sample variance unit is used for calculating sample variance Vi according to the original gray value in each zone, exports described sample variance Vi to described backlight illumination computing module;
Described backlight illumination computing module is used for according to described average gray Ai and described sample variance Vi, calculates backlight illumination initial value, backlight illumination end value and backlight drive value.
4, liquid crystal indicator according to claim 3 is characterized in that, described backlight illumination computing module comprises backlight illumination initial value computing unit, backlight illumination end value computing unit and the backlight drive value computing unit that connects in turn;
Described backlight illumination initial value computing unit is used for calculating the backlight illumination initial value according to formula Li=a0 * Ai+a1 * Vi+a2;
Wherein Li is the backlight illumination initial value, and Ai is described average gray, a0, a1, a2 be greater than 0 less than 1 scope in preset parameters;
Described backlight illumination end value computing unit is used for judging according to default decision logic the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin, exports described backlight illumination end value L ' i according to judged result and gives described Distribution calculation module backlight;
Described backlight drive value computing unit is used for calculating the backlight drive value according to formula Ti=L ' i * Base, exports to described backlight drive module, and wherein Ti is the backlight drive value, and Base is less than 1 default backlight illumination reference value greater than 0.
5, liquid crystal indicator according to claim 4, it is characterized in that, described backlight illumination end value computing unit comprises judgment sub-unit and the output subelement that connects in turn, described judgment sub-unit is used for judging according to default decision logic the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin, described output subelement is used for exporting described backlight illumination end value L ' i according to judged result, described default decision logic is: if Li＞Lmax, then described output subelement output L ' i=Lmax; If Li＜Lmin, then described output subelement output L ' i=Lmin; If Lmin≤Li≤Lmax, then described output subelement output L ' i=Li, wherein 0≤Lmin＜Lmax≤1.
6, a kind of method of data image signal processing is applied to the arbitrary liquid crystal indicator of claim 1 to 5, it is characterized in that, may further comprise the steps:
A1: the described data image signal of buffer memory;
A2: described data image signal subregion is analyzed;
A3: according to described analysis processing result, calculate backlight illumination initial value, backlight illumination end value and backlight drive value, obtain adjusted backlight brightness data, the driving LED backlight module is luminous;
A4: calculate described backlight illumination distributed intelligence according to described backlight illumination end value, for example, according to preset LED Luminance Distribution model and each regional backlight illumination end value,, obtain described backlight illumination distributed intelligence to the calculating that superposes of described each regional backlight illumination end value;
A5: according to described backlight illumination distributed intelligence, adjust the liquid crystal greyscale data, produce timing control signal, drive the liquid crystal panel display message according to adjusting back liquid crystal greyscale data.
7, method according to claim 6 is characterized in that, described steps A 2 specifically may further comprise the steps:
A21: the original gray value of all pixels is added up in described data image signal subregion, calculate the average gray Ai and the output of all pixels in each zone;
A22: the original gray value in each zone is calculated sample variance Vi and output.
8, method according to claim 7 is characterized in that: the following operation of described steps A 3 concrete execution:
A31: calculate the backlight illumination initial value according to formula Li=a0 * Ai+a1 * Vi+a2, wherein Li is the backlight illumination initial value, and Ai is described average gray, a0, a1, a2 be greater than 0 less than 1 scope in preset parameters;
A32: judge the magnitude relationship of described backlight illumination initial value Li and predefined backlight illumination maximal value Lmax of system and backlight illumination minimum value Lmin according to the first default decision logic, export described backlight illumination end value L ' i to described Distribution calculation module backlight according to judged result;
A33: calculate the backlight drive value according to formula Ti=L ' i * Base, export to described backlight drive module, wherein Ti is the backlight drive value, and Base is less than 1 default backlight illumination reference value greater than 0.
9, method according to claim 8 is characterized in that, before the described steps A 31, also carries out following steps A301, steps A 302 or steps A 303;
A301, pre-set parameter a0, a1 and a2;
A302, pre-set the described first default decision logic; For example, the described first default decision logic is: if Li＞Lmax, then L ' i=Lmax; If Li＜Lmin, then L ' i=Lmin; If Lmin≤Li≤Lmax, then L ' i=Li, wherein 0≤Lmin＜Lmax≤1;
A303, pre-set B parameter ase.
10, method according to claim 6, it is characterized in that, operation below described steps A 5 concrete execution the: use formula G ' i=Gi/BLi to calculate the initial gray-scale value of each pixel in each zone, wherein Gi is the original gray value of each pixel in each zone, BLi is the backlight illumination distribution value of each pixel correspondence, 0＜BLi＜1; Determine the final gray-scale value of each pixel according to pre-seting decision logic two; For example, described second pre-sets decision logic two is: if G ' i＞255, then G " i=255, otherwise G " i=G ' i, wherein G " i is the final gray-scale value of each pixel.
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