CN100543834C - Pulse generating circuit capable of adjusting display brightness of picture and display device - Google Patents
Pulse generating circuit capable of adjusting display brightness of picture and display device Download PDFInfo
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- CN100543834C CN100543834C CNB2007101065198A CN200710106519A CN100543834C CN 100543834 C CN100543834 C CN 100543834C CN B2007101065198 A CNB2007101065198 A CN B2007101065198A CN 200710106519 A CN200710106519 A CN 200710106519A CN 100543834 C CN100543834 C CN 100543834C
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Abstract
The invention provides a pulse generating circuit capable of adjusting display brightness of a picture and a display device. The display device comprises a display panel, a grid driving circuit and a pulse generating circuit, wherein the display panel is used for displaying a picture, the grid driving circuit drives the display panel according to a pulse signal generated by the pulse generating circuit, the pulse generating circuit comprises a histogram analyzing unit and a grid pulse modulator, the histogram analyzing unit is used for calculating a gray scale proportion value of the picture and comparing the gray scale proportion value with a critical value so as to generate a control signal, and the working time of the pulse signal is different in response to the control signal. Therefore, the difference of the picture seen by the user in the front view and the large view angle is reduced, the problems of large view angle deviation and gray scale inversion are solved, and the display brightness of the picture is effectively improved when the picture with more high gray scale value proportion is displayed.
Description
Technical field
The present invention relates to a kind of pulse-generating circuit and display device of adjusting the display brightness of picture; Being particularly related to a kind of GTG value of calculating a picture distributes with the pulse-generating circuit and the display device of the display brightness of adjusting this picture.
Background technology
Along with scientific-technical progress, various electronic products have become people's indispensable part of living.Wherein, display is the critical elements of electronic multimedia product.And Thin Film Transistor-LCD (thin filmtransistor liquid crystal display, TFT LCD) have power saving, radiationless, volume is little, low power consumption, do not take up space, advantage such as flat square, high-res, image quality are stable, replace traditional cathode-ray tube display (cathode ray tube display gradually, CRT display), be widely used on the display panel of electronic products such as mobile phone, screen, Digital Television, notebook.
Along with developing rapidly of Thin Film Transistor-LCD correlation technique, improve it and show that image quality becomes the common target in field for this reason.With the visual angle range, multiple minute territory vertical orientation (the multi-domain vertical alignment of Fujitsu's research and development, MVA) technology will go up downwards angle of visibility and expand to about 120 °, this technology is significantly improved the visual angle of LCD, no less than the feature with great visual angle of cathode-ray tube display.
Yet, adopt the LCD of existing MVA technology to have white (wash out) and the shortcoming of gray-scale inversion partially with great visual angle with great visual angle.Be meant the user with great visual angle partially in vain when watching with great visual angle, its picture chroma can significantly reduce, and gray-scale inversion then is not to use the person when watching with great visual angle with great visual angle, and the bright degree of picture can be reversed.The acceptable product of all non-user of LCD with these two kinds of phenomenons.
In order to solve two kinds of shortcomings that LCD had of the existing MVA technology of aforementioned employing.LCD manufacturer releases into multiple minute territory vertical orientation of rank improvement type, and (advanced multi-domainvertical alignment, AMVA) technology is to improve with great visual angle partially the bletilla shortcoming of gray-scale inversion with great visual angle.But the LCD of using the AMVA technology is when showing high-high brightness (being that picture GTG value is maximal value 255), its inner circuit design will cause the reduction of liquid crystal display displays brightness, and its high-high brightness that can show is lower than the high-high brightness that the LCD of using the MVA technology can show.
Therefore to how to adjust the display brightness of LCD, make it in demonstration, during the more picture of low GTG value, can improve the aforesaid inclined to one side with great visual angle bletilla shortcoming of gray-scale inversion with great visual angle; Also can when showing the more picture of high gray value, still can keep the brightness of its display frame, remain the target that the industry in this field also need be made great efforts.
Summary of the invention
A purpose of the present invention is to provide a kind of pulse-generating circuit in order to the display brightness of adjusting picture, and it comprises a Nogata map analysis unit (histogram analysis element) and a grid-pulse modulation device.This histogram analysis unit is in order to calculate a GTG ratio value of this picture, and with this GTG ratio value and the comparison of one first critical value, if this GTG ratio value is greater than this first critical value, then produce one first control signal, if this GTG ratio value is not more than this first critical value, then produce one second control signal; This grid-pulse modulation device is then in order to producing a pulse signal, and a working time of this pulse signal (operative time) responds this first control signal and this second control signal and difference; And the display brightness of this picture responds this working time and change.
About described pulse-generating circuit, wherein:
It was one first working time that this working time responds this first control signal, and it was one second working time that this working time responds this second control signal, and this first working time is greater than this second working time.
This histogram analysis unit also compares this GTG ratio value and one second critical value, if this GTG ratio value is not more than this first critical value but greater than this second critical value, then produce this second control signal, if this GTG ratio value is not more than this second critical value, then produce one the 3rd control signal, this working time also responds the 3rd control signal and difference.
It was one first working time that this working time responds this first control signal, it was one second working time that this working time responds this second control signal, it was one the 3rd working time that this working time responds the 3rd control signal, this first working time, this second working time was greater than the 3rd working time greater than this second working time.
This second working time is the default working time of this pulse-generating circuit.
Another purpose of the present invention is to provide a kind of display device of adjusting the display brightness of a picture, and it comprises a pulse-generating circuit, a display panel and a gate driver circuit; This pulse-generating circuit produces a pulse signal according to a GTG ratio value of this picture; This display panel is in order to show this picture; This gate driver circuit then drives this display panel according to this pulse signal; The display brightness of this picture responds a working time of this pulse signal and changes.
About described display device, wherein:
This pulse-generating circuit comprises: a Nogata map analysis unit, it is in order to calculate the GTG ratio value of this picture, and with this GTG ratio value and the comparison of one first critical value, if this GTG ratio value is greater than this first critical value, then produce one first control signal, if this GTG ratio value is not more than this first critical value, then produce one second control signal; And a grid-pulse modulation device, in order to producing this pulse signal, the working time of this pulse signal responds this first control signal and this second control signal and difference.
It was one first working time that this working time responds this first control signal, and it was one second working time that this working time responds this second control signal, and this first working time is greater than this second working time.
This histogram analysis unit also compares this GTG ratio value and one second critical value, if this GTG ratio value is not more than this first critical value but greater than this second critical value, then produce this second control signal, if this GTG ratio value is not more than this second critical value, then produce one the 3rd control signal, this working time also responds the 3rd control signal and difference.
It was one first working time that this working time responds this first control signal, it was one second working time that this working time responds this second control signal, it was one the 3rd working time that this working time responds the 3rd control signal, this first working time, this second working time was greater than the 3rd working time greater than this second working time.
This second working time is the default working time of this pulse-generating circuit.
This display panel is a LCD array.
In the present invention, this GTG ratio value number of pixels that each GTG value comprised of calculating this picture by this histogram analysis unit step of going forward side by side carries out the calculating of ratio and obtains.
The present invention can calculate the GTG value of picture, and adjusts the display brightness of picture according to the different proportion of its GTG value.So, can reduce the user in positive apparent time and in great visual angle the time difference of finding picture, to solve with great visual angle the problem of bletilla gray-scale inversion partially.And when showing the more picture of high gray value ratio, promote the display brightness of this picture effectively.
Description of drawings
Fig. 1 is the circuit block diagram of embodiments of the invention.
Wherein, description of reference numerals is as follows:
1: display device 100: vision signal
101: display panel 102: source signal
103: gate driver circuit 104: pulse signal
105: source electrode drive circuit 107: pulse-generating circuit
109: 1070: the first control signals of source electrode controller
1071: 1072: the second control signals in histogram analysis unit
1073: the grid-pulse modulation device
Embodiment
Behind the embodiment of consulting accompanying drawing and describing subsequently, these those skilled in the art just can understand other purpose of the present invention, and technological means of the present invention and embodiment.
The first embodiment of the present invention is a kind of display device 1 as shown in Figure 1, and it comprises a display panel 101, a gate driver circuit 103, one source pole driving circuit 105, a pulse-generating circuit 107 and one source pole controller 109.When display panel 101 desires showed the picture of a vision signal 100, display panel 101 needed to drive by gate driver circuit 103 and source electrode drive circuit 105.Source electrode drive circuit 105 receives source electrode controller 109 and works in the source signal 102 that processing vision signal 100 backs are produced.Display panel 101 can be a liquid crystal display (liquid crystal display; LCD) array of display of array or other type.
103 of gate driver circuits are to work by the pulse signal 104 that pulse-generating circuit 107 is produced.Pulse-generating circuit 107 comprises a Nogata map analysis unit 1071 and a grid-pulse modulation device 1073.Histogram analysis unit 1071 receiving video signals 100, and the GTG ratio value of calculating vision signal 100.The GTG ratio value of vision signal 100 calculates the number of pixels that each the GTG value (GTG value 0 is to GTG value 255) of a picture in the vision signals 100 is comprised by histogram analysis unit 1071, then also further carries out the calculating of ratio and get it.Further, histogram analysis unit 1071 interior reservoir have a critical value, and this critical value can be that display device 1 manufacturing has configured when dispatching from the factory, or is set when using display device 1 by the user.The mode of narrating according to leading portion when histogram analysis unit 1071 is calculated after the GTG ratio value of vision signal 100, this GTG ratio value and this critical value is compared again.When the GTG ratio value of the vision signal 100 of picture during greater than this critical value, then histogram analysis unit 1071 produces one first control signal 1070.And when the GTG ratio value of the vision signal 100 of picture was not more than this critical value, then histogram analysis unit 1071 produced one second control signal 1072.Grid-pulse modulation device 1073 produces pulse signals 104 according to these control signals 1070 and 1072, and wherein the working time of this pulse signal 104 can respond the difference of the received control signal of grid-pulse modulation device 1073 and change.
In more detail, promptly when grid-pulse modulation device 1073 received first control signal 1070, then the working time of pulse signal 104 was adjusted into for one first working time.When grid-pulse modulation device 1073 received second control signal 1072, then the working time of pulse signal 104 was adjusted into for one second working time.Because histogram analysis unit 1071 produces first control signal 1070 and represents in the middle of the vision signal 100, the data of its high gray value are more, therefore need long working time driving grid driving circuit 103, so first working time can be greater than second working time, the picture display brightness when making every effort to promote display panel 101 display video signals 100.
According to two kinds of different operating times of the described pulse signal 104 of leading portion, can find that the first embodiment of the present invention can provide the selection of 101 two kinds of different display brightness of display panel, display panel 101 can use LCD that the display mode of two kinds of different brightness the solves prior art bletilla shortcoming of gray-scale inversion with great visual angle partially with great visual angle.
Be noted that though Fig. 1 transmits first control signal 1070 and second control signal 1072 respectively with two signal line, yet the present invention does not limit first control signal 1070 and second control signal 1072 needs to be transmitted by different signal wires.In more detail, histogram analysis unit 1071 can be designed to utilize " high level " of signal to reach " low level " to represent the data of high gray value of the more and vision signal 100 of the data of high gray value of vision signal 100 less respectively, for example, high level signal is represented first control signal 1070, low level signal is represented second control signal 1072, so only needs a signal line can represent the distribution proportion of the GTG value of vision signal 100.
The second embodiment of the present invention also is a kind of display device, and its structure is approximate with the display device 1 of first embodiment, and difference is in the histogram analysis unit of second embodiment, 1071 interior reservoir and has two critical values: first critical value and second critical value.In a second embodiment, first critical value and second critical value can be that the display device manufacturing of second embodiment has configured when dispatching from the factory, or are set when using the display device of present embodiment by the user.
Similarly, after histogram analysis unit 1071 calculates the GTG ratio value of vision signal 100, again this GTG ratio value and first critical value and second critical value are compared.When the GTG ratio value of vision signal 100 during greater than first critical value, then histogram analysis unit 1071 produces one first control signal.When the GTG ratio value of vision signal 100 is not more than first critical value but during greater than second critical value, then histogram analysis unit 1071 produces one second control signal.When the GTG ratio value of picture 100 was not more than second critical value, then histogram analysis unit 1071 produced one the 3rd control signal.To produce pulse signal 104, further, the working time of pulse signal 104 can respond the difference of these control signals and change grid-pulse modulation device 1073 according to these control signals.
In more detail, when grid-pulse modulation device 1073 received first control signal, then the working time of pulse signal 104 was one first working time; When grid-pulse modulation device 1073 received second control signal, then the working time of pulse signal 104 was one second working time; When grid-pulse modulation device 1073 received the 3rd control signal, then the working time of pulse signal 104 was one the 3rd working time.
When histogram analysis unit 1071 produces first control signal, represent in the middle of the vision signal 100, therefore the data of its high gray value are more, need long working time driving grid driving circuit 103, the picture display brightness when making every effort to promote display panel 101 display video signals 100.When histogram analysis unit 1071 produces the 3rd control signal, represent in the middle of the vision signal 100, the data of its low GTG value are more, therefore need short working time driving grid driving circuit 103, to make every effort to solve with great visual angle the problem of bletilla gray-scale inversion partially.And when histogram analysis unit 1071 produces second control signal, represent in the middle of the vision signal 100, the distribution of its data GTG value is comparatively average, so grid-pulse modulation device 1073 can provide the pulse signal 104 of the second default working time of pulse-generating circuit 107 outputs to come driving grid driving circuit 103.Therefore, second working time was greater than the 3rd working time greater than second working time first working time.
According to three kinds of different operating times of the described pulse signal 104 of leading portion, can find that the second embodiment of the present invention can provide the selection of 101 3 kinds of different display brightness of display panel, display panel 101 can use LCD that the display mode of three kinds of different brightness further the solves prior art bletilla shortcoming of gray-scale inversion with great visual angle partially with great visual angle.The different display brightness of the different GTG ratio values of the adjustment that thus, display panel 101 can be meticulousr.
Second embodiment can utilize 2 digital signal to represent first control signal, second control signal and the 3rd control signal, and an example of 2 the digital signal that result after the GTG ratio value and first critical value and the second critical value comparison and histogram analysis unit are produced is as shown in the table:
When GTG ratio value during greater than first critical value, 2 digital signal is shown as [0,0], and export first control signal, when the GTG ratio value is not more than first critical value, but greater than second critical value, 2 digital signal is shown as [0,1], and export second control signal, when the GTG ratio value was not more than second critical value, 2 digital signal was shown as [1,0], and export the 3rd control signal.But the invention is not restricted to this mode.
Table one
| Histogram analysis unit comparative result | 2 digital signal | The output of histogram analysis unit |
| The GTG ratio value is greater than first critical value | [0，0] | First control signal |
| The GTG ratio value is not more than first critical value, but greater than second critical value | [0，1] | Second control signal |
| The GTG ratio value is not more than second critical value | [1，0] | The 3rd control signal |
From the above, with respect to the LCD of prior art, display device of the present invention can be calculated the GTG ratio value of picture, and further compares GTG ratio value and built-in critical value, to adjust the display brightness of picture according to its result.Thus, the present invention is except the LCD that can the improve prior art effectively bletilla shortcoming of gray-scale inversion with great visual angle partially with great visual angle, simultaneously can when showing the more picture of high gray value ratio, promote the display brightness of this picture effectively, to reach required technological breakthrough purpose.
The above embodiments only are used for exemplifying enforcement aspect of the present invention, and explain technical characterictic of the present invention, are not to be used for limiting category of the present invention.Any those skilled in the art can unlabored change or the arrangement of isotropism all belong to the present invention's scope required for protection, claim protection domain of the present invention should be as the criterion with claims.
Claims (7)
1. pulse-generating circuit in order to the display brightness of adjusting picture, this pulse-generating circuit comprises:
One Nogata map analysis unit, it is in order to calculate the GTG ratio value of this picture, and with this GTG ratio value and the comparison of one first critical value, if this GTG ratio value is greater than this first critical value, then produce one first control signal, if this GTG ratio value is not more than this first critical value, then produce one second control signal; And
One grid-pulse modulation device, it is in order to produce a pulse signal, the working time that this pulse signal responds this first control signal was first working time, the working time that this pulse signal responds this second control signal was second working time, and described first working time is greater than described second working time
Wherein, this picture has two kinds of different display brightness that response changes with described second working time described first working time, and this GTG ratio value number of pixels that each GTG value comprised of calculating this picture by this histogram analysis unit is gone forward side by side and one gone on foot and carry out the calculating of ratio and obtain.
2. pulse-generating circuit as claimed in claim 1, wherein this histogram analysis unit also compares this GTG ratio value and one second critical value, if this GTG ratio value is not more than this first critical value but greater than this second critical value, then produce this second control signal, if this GTG ratio value is not more than this second critical value, then produce one the 3rd control signal, it was one the 3rd working time that this working time responds the 3rd control signal, and this second working time is greater than the 3rd working time.
3. pulse-generating circuit as claimed in claim 2, wherein this second working time is the default working time of this pulse-generating circuit.
4. the display device that can adjust the display brightness of picture, this display device comprises:
One pulse-generating circuit, its GTG ratio value according to this picture produces a pulse signal;
One display panel, it is in order to show this picture; And
One gate driver circuit, it drives this display panel according to this pulse signal;
Wherein, the display brightness of this picture responds a working time of this pulse signal and changes,
Wherein this pulse-generating circuit comprises:
One Nogata map analysis unit, it is in order to calculate the GTG ratio value of this picture, and with this GTG ratio value and the comparison of one first critical value, if this GTG ratio value is greater than this first critical value, then produce one first control signal, if this GTG ratio value is not more than this first critical value, then produce one second control signal; And
One grid-pulse modulation device, in order to produce this pulse signal, the working time that this pulse signal responds this first control signal was first working time, the working time that this pulse signal responds this second control signal was second working time, and described first working time is greater than described second working time
Wherein, this GTG ratio value number of pixels that each GTG value comprised of calculating this picture by this histogram analysis unit step of going forward side by side carries out the calculating of ratio and obtains.
5. display device as claimed in claim 4, wherein this histogram analysis unit also compares this GTG ratio value and one second critical value, if this GTG ratio value is not more than this first critical value but greater than this second critical value, then produce this second control signal, if this GTG ratio value is not more than this second critical value, then produce one the 3rd control signal, it was one the 3rd working time that this working time responds the 3rd control signal, and this second working time is greater than the 3rd working time.
6. display device as claimed in claim 5, wherein this second working time is the default working time of this pulse-generating circuit.
7. display device as claimed in claim 4, wherein this display panel is a LCD array.
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| CNB2007101065198A CN100543834C (en) | 2007-06-01 | 2007-06-01 | Pulse generating circuit capable of adjusting display brightness of picture and display device |
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| CNB2007101065198A CN100543834C (en) | 2007-06-01 | 2007-06-01 | Pulse generating circuit capable of adjusting display brightness of picture and display device |
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| CN100543834C true CN100543834C (en) | 2009-09-23 |
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| CN101826315B (en) * | 2010-05-06 | 2012-06-27 | 友达光电股份有限公司 | Liquid crystal display device |
| CN102087819A (en) * | 2011-01-24 | 2011-06-08 | 苏州佳世达电通有限公司 | Display device |
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| US20040135755A1 (en) * | 2002-12-30 | 2004-07-15 | Hyung-Ki Hong | Liquid crystal display device and driving method thereof |
| CN1808552A (en) * | 2005-01-21 | 2006-07-26 | 三星电子株式会社 | Display device and apparatus for driving the same |
| JP2006276677A (en) * | 2005-03-30 | 2006-10-12 | Toshiba Corp | Display device and driving method of display device |
| CN1848217A (en) * | 2005-04-15 | 2006-10-18 | Lg电子株式会社 | Plasma display apparatus and method of driving the same |
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|---|---|---|---|---|
| CN1333529A (en) * | 2000-07-07 | 2002-01-30 | 索尼公司 | Indicator and driving method thereof |
| US20040135755A1 (en) * | 2002-12-30 | 2004-07-15 | Hyung-Ki Hong | Liquid crystal display device and driving method thereof |
| CN1808552A (en) * | 2005-01-21 | 2006-07-26 | 三星电子株式会社 | Display device and apparatus for driving the same |
| JP2006276677A (en) * | 2005-03-30 | 2006-10-12 | Toshiba Corp | Display device and driving method of display device |
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