CN100363975C - Apparatus and method for regulating common electrode voltage of liquid crystal display - Google Patents
Apparatus and method for regulating common electrode voltage of liquid crystal display Download PDFInfo
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- CN100363975C CN100363975C CNB2005100459032A CN200510045903A CN100363975C CN 100363975 C CN100363975 C CN 100363975C CN B2005100459032 A CNB2005100459032 A CN B2005100459032A CN 200510045903 A CN200510045903 A CN 200510045903A CN 100363975 C CN100363975 C CN 100363975C
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Abstract
The present invention relates to a liquid crystal display apparatus, particularly to an image signal apparatus segmenting an image into a plurality of blocks and providing additional common electrode complementary voltage in order to improve the flicker phenomenon generating around the image of the liquid crystal display apparatus and a method thereof. The apparatus of the present invention comprises a vertical synchronization signal, a horizontal synchronization signal and a clock signal which are input by an external signal input apparatus, a segmentation part segmenting the image displayed on a display screen into at least two blocks, a common electrode voltage and common electrode complementary voltage generating part loading the specific common electrode voltage to a liquid crystal panel and generating and outputting the specific common electrode complementary voltage by taking the block segmented by the image segmentation part as the unit, and a sample hold part feeding the image signal of the additional common electrode complementary voltage input from the common electrode voltage and common electrode complementary voltage generation part.
Description
Technical field
The present invention relates to liquid crystal indicator, especially relevant scintillation in order to be taken place around the picture that improves liquid crystal indicator with the picture segmentation piece that pluralizes, provides additional common electrode to replenish the device and method of the image signal of voltage.
Background technology
Recently, instead existing cathode ray tube (CRT) display device, liquid crystal indicator is subjected to especially gazing at.Liquid crystal indicator comprises liquid crystal panel and in order to drive the driving circuit of this liquid crystal panel.
Fig. 1 is the structure skeleton diagram of liquid crystal indicator liquid crystal panel.
With reference to Fig. 1, above-mentioned liquid crystal panel (10), be by substrate with the matrix form arranged in a crossed manner plural door line (12) and plural data line (14), and thin film transistor (TFT) (TFT) (15) and pixel electrode (16) be set and constitute at its cross part.
For the gate signal of connecting above-mentioned thin film transistor (TFT) (15) loads on corresponding door line (12) successively, by the data-signal of data line (14),, pass to pixel electrode (16) by above-mentioned thin film transistor (TFT), control the light quantity that sees through of respective pixel.
As mentioned above, above-mentioned liquid crystal indicator moves with following principle, rely on the gate signal that loads on a line (12) successively, connection is connected in the respective films liquid crystal (13) of a line (12), load on of source electrode and the drain electrode of the data-signal of liquid crystal panel (10) data line (14), transmit to corresponding picture by the thin film transistor (TFT) of connection.
On the other hand, each pixel operates respectively according to the driving voltage that loads, and at this moment, pixel cell is driven central potential be called common electrode voltage.As shown in Figure 2, usually in order to reduce scintillation,, be the center with the common electrode voltage by the on-load voltage of data line (14), carry out V+, V-and change loading.
Fig. 3 is that the IH that is used in traditional liquid crystal indicator turns to the type of drive diagrammatic sketch.
Above-mentioned IH turns to type of drive to be meant when the exchanged water scan lines mode that the voltage transitions V+ of data line, V-load.And, when changing picture, also change V+, V-.
Fig. 4 is the schematic block diagram that is used in the common electrode voltage adjusting gear structure of traditional liquid crystal indicator.
With reference to Fig. 4, above-mentioned common electrode voltage adjusting gear comprises as the lower part: utilize from vertical synchronization signal (V-sync) and the level signal same period (H-sync) and the clock signal of signal input apparatus (100) input, generation will be from R, the G of signal input apparatus input, the image signal handling part (102) that B image signal conversion process is prescribed form in order to drive the synchronizing signal of liquid crystal panel (112); With synchronizing signal and the R from above-mentioned image signal handling part input, G, B image signal are the basis, adjust the sampling maintaining part (106) that liquid crystal panel (112) is supplied with level; Under the control of above-mentioned control part (104), generate regulation Vcom, the Vcom generating unit (108) that provides to liquid crystal panel (112); Response is adjusted the control part (104) of above-mentioned Vcom from the defined order signal of outside input.
At this, illustrated in Fig. 5, above-mentioned sampling maintaining part (106) is to liquid crystal panel, and output corresponding to the digital data of handling input from image signal (for example, 10 bit number code datas) it is the same level difference at center that V+/V-voltage, above-mentioned V+/V voltage have with Vcom.Liquid crystal panel is unit based on synchronizing signal and the vertical/horizontal signal same period with horizontal line and picture frame, selects one of them of above-mentioned V+/V-voltage, drives.
Because above-mentioned Vcom is the central potential of each pixel ON/OFF of decision liquid crystal panel, so need adjust above-mentioned Vcom according to each liquid crystal panel.
Fig. 6 is the common electrode voltage method of adjustment process flow diagram of traditional liquid crystal indicator.
With reference to Fig. 6, if the liquid crystal indicator energising, liquid crystal panel (112) begins to drive (S10), and control part (104) will load the Vcom (S12) of regulation to above-mentioned liquid crystal panel.Then, as shown in Figure 7, the operator observes the picture central portion (S14) that is presented at the liquid crystal indicator screen, for example, and center line or its abutment line, the blink states of affirmation picture central portion.At this moment, (S16 " example ") adjusted in flicker if desired, and above-mentioned control part (104) will the response external command signal, resets above-mentioned Vcom (S18), adjusts with regard to power cut-off if there is no need.
As mentioned above, in the past,, be the center with the picture Central Line in the product export stage of liquid crystal indicator, adjust common electrode voltage (Vcom), to wired pixel same Vcom is provided.But, because the desired Vcom of each pixel of liquid crystal panel difference more or less in fact, so, exist more to the serious more problem of peripheral scintillation though can reduce the scintillation of picture central portion.
Summary of the invention
The objective of the invention is: the picture segmentation of liquid crystal indicator is become specified block, is unit with the relevant block, loads the image signal that additional common electrode replenishes voltage, improves the scintillation that takes place around the picture.
The objective of the invention is to be achieved through the following technical solutions:
The common electrode voltage adjusting gear of liquid crystal indicator, comprise as the lower part: utilize from vertical synchronization signal and the level signal same period and the clock signal of the input of external signal input media, the picture level that is presented at screen is divided into 2 or 3 picture segmentation portion; Load the afore mentioned rules common electrode voltage to above-mentioned liquid crystal panel, and be unit, generate common electrode voltage and the common electrode that also output regulation common electrode replenishes voltage and replenish the voltage generating unit with the piece that above-mentioned picture segmentation is partly cut; And, will replenish the image signal of voltage from the additional common electrode that common electrode voltage and common electrode replenish the input of voltage generating unit, the sampling maintaining part that provides to liquid crystal panel.
The common electrode voltage adjusting gear of liquid crystal indicator, the scintillation on 1 horizontal scanning line of image signal elimination in block of the additional voltage of additional above-mentioned common electrode.
Liquid crystal indicator common electrode voltage method of adjustment comprised as the next stage: the picture level that (a) will be presented at screen is divided into the stage more than 2 or 3; (b) provide stage of regulation common electrode voltage to liquid crystal panel; (c) response is benchmark from the defined order signal of outside input with at least 1 horizontal scanning line in above-mentioned each picture block of cutting apart, generates the stage that common electrode replenishes voltage; (d) to the stage of replenishing voltage corresponding to the above-mentioned additional above-mentioned common electrode of image signal of cutting apart each picture block.
The common electrode voltage method of adjustment of liquid crystal indicator, the image signal of the additional voltage of additional above-mentioned common electrode is eliminated the scintillation of the datum-plane sweep trace in the block.
The effect of invention
According to the present invention, the block unit with picture segmentation one-tenth regulation number loads Vcom to the image signal that is input into each block and replenishes voltage, just can reduce the scintillation of generation around picture.
Description of drawings
Fig. 1 is the structure skeleton diagram of liquid crystal indicator liquid crystal panel;
Fig. 2 loads on the level schematic view of the image signal of liquid crystal indicator for tradition;
Fig. 3 is that the 1H that is used in traditional liquid crystal indicator turns to the type of drive diagrammatic sketch;
Fig. 4 is the schematic block diagram that is used in the common electrode voltage adjusting gear structure of traditional liquid crystal indicator;
Fig. 5 is the schematic view of the image signal level of traditional liquid crystal indicator sampling maintaining part output;
Fig. 6 is the common electrode voltage method of adjustment process flow diagram of traditional liquid crystal indicator;
Fig. 7 is a picture center line diagrammatic sketch of adjusting standard as traditional liquid crystal indicator common electrode voltage;
Fig. 8 is the formation schematic block diagram according to the liquid crystal indicator common electrode voltage adjusting gear of the embodiment of the invention;
Fig. 9 is the liquid crystal indicator common electrode voltage method of adjustment process flow diagram according to the embodiment of the invention;
Figure 10 is the exemplary plot of divided frame when adjusting the liquid crystal indicator common electrode voltage according to the embodiment of the invention;
Figure 11 is the image signal level schematic view of liquid crystal indicator sampling maintaining part of the present invention output.
Embodiment
Fig. 8 is the formation schematic block diagram according to the liquid crystal indicator common electrode voltage adjusting gear of the embodiment of the invention.
With reference to Fig. 8, above-mentioned common electrode voltage adjusting gear comprises as the lower part: utilize from vertical synchronization signal (V-sync) and the level signal same period (H-sync) and the clock signal of external signal input media (100) input, generation will be from R, the G of signal input apparatus (100) input, the image signal handling part (202) that B image signal conversion process is prescribed form in order to drive the synchronizing signal of liquid crystal panel (112); With synchronizing signal and the R from above-mentioned image signal handling part input, G, B image signal are the basis, and the sampling maintaining part (206) of the level that provides to liquid crystal panel (112) is provided.Utilization becomes the picture segmentation that is presented at screen the picture segmentation portion (207) of the piece of regulation number (for example, 3) from vertical synchronization signal (V-sync) and the level signal same period (H-sync) and the clock signal of external signal input media (100) input; Control according to control part (204), according to the synchronizing signal that generates at above-mentioned image signal handling part, generate the Vcom of regulation, directly provide to liquid crystal panel (112), each piece of cutting apart with above-mentioned picture segmentation portion (207) is a unit, generate Vcom and replenish voltage, the Vcom/Vcom that supplies with to sampling maintaining part (206) replenishes voltage generating unit (208); Control the control part (204) of all runnings of above-mentioned common electrode voltage adjusting gear.
According to above-mentioned formation, the picture segmentation of liquid crystal indicator is become the piece of regulation number after, each piece of cutting apart is carried out Vcom adjusts.
Fig. 9 is the liquid crystal indicator common electrode voltage method of adjustment process flow diagram according to the embodiment of the invention.
With reference to Fig. 9, if liquid crystal indicator energising, liquid crystal panel (112) begins to drive (S20), and picture segmentation portion (207) utilizes vertical synchronization signal (V-sync) and the level signal same period (H-sync) and clock signal picture segmentation to be become to stipulate the piece (S22) of number (for example, 3).At this moment, the size of the number of piece and piece can change.
Then, the above-mentioned Vcom/Vcom of above-mentioned control part (204) control replenishes voltage generating unit (208), loads the Vcom (S24) of regulation to liquid crystal panel.Then, the adjustment work of above-mentioned loading Vcom is carried out respectively on above-mentioned 3 pieces of cutting apart.
As shown in figure 10, the picture of liquid crystal indicator is split into 3 pieces, both when a, b, c piece, at first, the operator confirms that (both, first line) blink states need to judge whether adjustment will load on the Vcom (S26) of the horizontal scanning line of a piece to the interior some horizontal scanning lines of a piece.If being judged as needs Vcom according to scintillation adjusts, operation by the operator, obtain regulation and adjust the input (" example " in stage 26) of command signal, above-mentioned control part (204) control Vcom/Vcom replenishes voltage generating unit (110), loads Vcom to above-mentioned sampling maintaining part and replenishes voltage (206) (S27).Above-mentioned stage (S26) and stage (S27), till not needing Vcom to adjust, carry out repeatedly.
Then, as shown in figure 10, to b piece and c piece, (S29) (S30) (S31) also to carry out the step (S28) identical with above-mentioned stage (S26) and stage (S27).At this moment, about the b piece, confirm that (both, second line) blink states about the c piece, is confirmed the blink states of the certain level sweep trace (both, the three-way) in the c piece for certain level sweep trace in the b piece.
Figure 11 is the image signal level schematic view of liquid crystal indicator sampling maintaining part of the present invention output.
Figure 11 is the same with Fig. 5, has shown that sampling maintaining part (206) obtains the corresponding analog level of the digital image signal input and output of 10 bits from the image signal handling part.As shown in the figure, can know that the image signal level of sampling maintaining part (206) output is to have added Vcom at before this V+/V-voltage to replenish voltage, both, V+ replenishes voltage and V-replenishes voltage.Above-mentioned Vcom replenishes voltage and replenishes voltage generating unit (208) loading by Vcom/Vcom.For this reason, the image signal of above-mentioned sampling maintaining part (206) output has the level that loads the additional voltage of the additional voltage/V of V+ at V+/V-voltage, and having with Vcom is the same electrical adjustment at center.Liquid crystal panel (112) is unit based on synchronizing signal and the vertical/horizontal signal same period with horizontal line and framework, selects some in above-mentioned 2 output signals, drives.
As mentioned above, load the image signal of processing, can farthest reduce the scintillation of each piece of picture at liquid crystal panel.
Claims (4)
1. the common electrode voltage adjusting gear of liquid crystal indicator, it is characterized in that comprising as the lower part: utilize from vertical synchronization signal and the level signal same period and the clock signal of the input of external signal input media, the picture level that is presented at screen is divided into 2 or 3 picture segmentation portion; Load the afore mentioned rules common electrode voltage to above-mentioned liquid crystal panel, and be unit, generate common electrode voltage and the common electrode that also output regulation common electrode replenishes voltage and replenish the voltage generating unit with the piece that above-mentioned picture segmentation is partly cut; And, will replenish the image signal of voltage from the additional common electrode that common electrode voltage and common electrode replenish the input of voltage generating unit, the sampling maintaining part that provides to liquid crystal panel.
2. the common electrode voltage adjusting gear of liquid crystal indicator as claimed in claim 1 is characterized in that: the scintillation on 1 horizontal scanning line of image signal elimination in block of the additional voltage of additional above-mentioned common electrode.
3. liquid crystal indicator common electrode voltage method of adjustment is characterized in that comprising as the next stage: the picture level that (a) will be presented at screen is divided into 2 or 3 stage; (b) provide stage of regulation common electrode voltage to liquid crystal panel; (c) response is benchmark from the defined order signal of outside input with at least 1 horizontal scanning line in above-mentioned each picture block of cutting apart, generates the stage that common electrode replenishes voltage; (d) to the stage of replenishing voltage corresponding to the above-mentioned additional above-mentioned common electrode of image signal of cutting apart each picture block.
4. the common electrode voltage method of adjustment of liquid crystal indicator as claimed in claim 3 is characterized in that: the scintillation of the datum-plane sweep trace in the image signal elimination block of the additional voltage of additional above-mentioned common electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100459032A CN100363975C (en) | 2005-02-23 | 2005-02-23 | Apparatus and method for regulating common electrode voltage of liquid crystal display |
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| CNB2005100459032A CN100363975C (en) | 2005-02-23 | 2005-02-23 | Apparatus and method for regulating common electrode voltage of liquid crystal display |
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| CN100363975C true CN100363975C (en) | 2008-01-23 |
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| CN101425266B (en) * | 2007-11-02 | 2012-06-13 | 群康科技(深圳)有限公司 | Overdrive method and overdrive circuit |
| CN110890075A (en) * | 2019-11-15 | 2020-03-17 | Tcl华星光电技术有限公司 | Driving method, display panel and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1398392A (en) * | 2000-11-30 | 2003-02-19 | 汤姆森许可公司 | Method and appts. for controlling common mode electrode voltage in LCOS/LCD |
| CN1464500A (en) * | 2002-06-24 | 2003-12-31 | 瀚宇彩晶股份有限公司 | Process and circuit for reducing liquid crystal display panel flicker |
| CN1534580A (en) * | 1995-01-26 | 2004-10-06 | ��ʽ����뵼����Դ�о��� | Liquid crystal electrooptical device |
| JP2004287113A (en) * | 2003-03-24 | 2004-10-14 | Sharp Corp | Liquid crystal display |
| US20040239667A1 (en) * | 2003-03-03 | 2004-12-02 | Hiroyuki Takahashi | Image display device |
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2005
- 2005-02-23 CN CNB2005100459032A patent/CN100363975C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1534580A (en) * | 1995-01-26 | 2004-10-06 | ��ʽ����뵼����Դ�о��� | Liquid crystal electrooptical device |
| CN1398392A (en) * | 2000-11-30 | 2003-02-19 | 汤姆森许可公司 | Method and appts. for controlling common mode electrode voltage in LCOS/LCD |
| CN1464500A (en) * | 2002-06-24 | 2003-12-31 | 瀚宇彩晶股份有限公司 | Process and circuit for reducing liquid crystal display panel flicker |
| US20040239667A1 (en) * | 2003-03-03 | 2004-12-02 | Hiroyuki Takahashi | Image display device |
| JP2004287113A (en) * | 2003-03-24 | 2004-10-14 | Sharp Corp | Liquid crystal display |
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