CN102270433B - Device and method for improving dim-line or dim-block phenomenon of liquid crystal display - Google Patents
Device and method for improving dim-line or dim-block phenomenon of liquid crystal display Download PDFInfo
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Abstract
The embodiment of the invention discloses a device and a method for improving a dim-line or dim-block phenomenon of a liquid crystal display and relates to the field of liquid crystal displays. The method and the device can effectively improve the dim-line or dim-block phenomenon of the liquid crystal display. The device for improving the dim-line or dim-block phenomenon of the liquid crystal display comprises a sampling comparison unit and a compensation unit; the sampling comparison unit is connected with a pixel electrode of a liquid crystal panel subpixel unit, and is used for comparing a difference voltage obtained through comparison between the sampled actual output voltage of a subpixel unit and the reference voltage and a certain set value; and the compensation unit is used for latching the difference voltage when the difference voltage is greater than the set value, and compensating the difference voltage to the subpixel unit in the next frame, and not compensating the difference voltage when the difference voltage is smaller than the set value. The device and the method are applied to the liquid crystal displays.
Description
Technical field
The present invention relates to field of liquid crystal, relate in particular to a kind of apparatus and method of improving the light gray line of liquid crystal display or light grey piece phenomenon.
Background technology
Along with development and the growth in the living standard of science and technology, the consumer is also more and more higher to the requirement of LCD picture size, and as the liquid crystal panel of the display unit of liquid crystal display, its size is also increasing.
Large-sized liquid crystal panel, its RC (impedance and capacitive reactance) time-delay can badly influence the picture quality of liquid crystal display.particularly, in the situation that RC is abnormal, easily cause the virtual voltage of liquid crystal panel and expect to have difference between input voltage, when the gray scale picture is identical, cause the magnitude of voltage of two identical row voltages of polarity not identical, namely under identical gray scale picture, inevitable property due to the RC time-delay, different gray scale pictures appears in different row, show as Dim-Line (light gray line) or Dim-Block (the light grey piece) phenomenon of vertical direction on picture quality, especially when the characteristic of liquid crystal panel is inconsistent, be the metal-oxide-semiconductor technique of output channel not simultaneously, can increase the weight of the generation of this phenomenon.
Prior art is by adopting good material to reduce impedance and the capacitive reactance of liquid crystal panel, it is the RC time-delay, overcome defects, but, the inventor finds when realizing technical scheme of the present invention, there is following problem at least in prior art, due to closely related by the degree and the technique that reduce impedance and capacitive reactance, and therefore more difficult assurance; After liquid crystal panel is determined, can't change resistance value and capacitance, when the Dim-Line that extremely causes due to RC or Dim-Block phenomenon occurring, its maintenance cost is equivalent to again make MASK.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of apparatus and method of improving liquid crystal display Dim-Line or Dim-Block phenomenon, can effectively improve liquid crystal display Dim-Line or Dim-Block phenomenon.
For solving the problems of the technologies described above, the apparatus and method that the present invention improves liquid crystal display Dim-Line or Dim-Block phenomenon adopt following technical scheme:
A kind of device that improves the light gray line of liquid crystal display or light grey piece phenomenon comprises: sampling comparing unit and compensating unit,
Described sampling comparing unit is connected with pixel electrode in liquid crystal panel sub-pix unit, and the actual output voltage of the sub-pix unit that is used for sampling the is obtained difference voltage that obtains of comparing with reference voltage is compared with a certain setting value;
If described compensating unit is used for described difference voltage greater than described setting value, latchs described difference voltage, and when next frame, compensate described difference voltage to described sub-pix unit; If described difference voltage is less than or equal to described setting value, uncompensation.
The function of described compensating unit is realized by charge pump circuit.
Described sampling comparing unit comprises:
The controlling of sampling module is used for the actual output voltage that sampling obtains the sub-pix unit;
The first comparison module is used for described actual output voltage is compared with described reference voltage, obtains difference voltage;
The second comparison module is used for described difference voltage is compared with described setting value.
The function of described controlling of sampling module is realized by time schedule controller.
The implementation that the function of described controlling of sampling module is realized by time schedule controller is state machine or DLC (digital logic circuit).
The function of described the second comparison module is realized by the analog voltage comparator that is provided with described setting value.
Described analog voltage comparator is arranged on drive integrated circult intralamellar part or liquid crystal panel.
A kind of method of improving the light gray line of liquid crystal display or light grey piece phenomenon comprises:
The actual output voltage of the sub-pix unit difference voltage that obtains of comparing with reference voltage is compared with a certain setting value;
If described difference voltage greater than described setting value, latchs described difference voltage, and when next frame, compensate described difference to described sub-pix unit; If described difference voltage is less than or equal to described setting value, uncompensation.
Compare with the reference voltage difference voltage that obtains of described actual output voltage with the sub-pix unit is compared with a certain setting value and is comprised:
Sampling obtains the actual output voltage of sub-pix unit;
Described actual output voltage is compared with described reference voltage, obtain difference voltage;
Described difference voltage is compared with described setting value.
in the technical scheme of the present embodiment, introduced the sample line to memory capacitance Cs, utilize the sampling comparison module that the rows and columns data of different range on liquid crystal panel are sampled, the actual output voltage reference voltage corresponding with the grey level of its expectation input voltage that sampling the is obtained difference voltage that draws of comparing need to judge whether compensation, in this difference voltage during greater than a certain setting value, by compensating module compensate for poor threshold voltage to the data line of the sub-pix unit of needs compensation, thereby the Dim-Line or the Dim-Block phenomenon that extremely cause due to RC have been reduced, and its circuit is realized simple, for ease of maintenaince.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the equivalent circuit diagram of embodiment of the present invention full wafer liquid crystal panel;
Fig. 2 is one of equivalent circuit diagram of the embodiment of the present invention liquid crystal panel of using the device improve liquid crystal display Dim-Line or Dim-Block phenomenon;
Fig. 3 is the structural scheme of mechanism of embodiment of the present invention sampling comparing unit;
Fig. 4 be the embodiment of the present invention liquid crystal panel of using the device improve liquid crystal display Dim-Line or Dim-Block phenomenon equivalent circuit diagram two;
Fig. 5 is the circuit diagram of embodiment of the present invention charge pump circuit;
Fig. 6 is the sampling time sequence figure of sampling actual output voltage in the embodiment of the present invention;
Fig. 7 is controlling of sampling constitutional diagram in the embodiment of the present invention;
Fig. 8 is the structural representation of controlling of sampling module in the embodiment of the present invention;
Fig. 9 is liquid crystal panel Dim-Line or Dim-Block phenomenon multiple district schematic diagram in the embodiment of the present invention;
Figure 10 is the method flow diagram that the embodiment of the present invention is improved Dim-Line or Dim-Block phenomenon;
Figure 11 is the method flow diagram of step 101 in Figure 10.
Description of reference numerals:
The 1-comparing unit of sampling; The 2-compensating unit; 11-controlling of sampling module;
12-the first comparison module; 13-the second comparison module; 21-pulsating wave conversion chip;
The 22-charge pump.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the present invention provides a kind of apparatus and method of improving liquid crystal display Dim-Line or Dim-Block phenomenon, can effectively improve Dim-Line or Dim-Block phenomenon that liquid crystal indicator causes due to the RC time-delay.
Fig. 1 is the equivalent circuit diagram of full wafer liquid crystal panel, and as shown in Figure 1, in liquid crystal panel, each TFT (Thin Film Transistor, thin film transistor (TFT)) connects a C who is formed by pixel electrode and public electrode
LC(pixel capacitance) is used for forming electric field when data line charges to pixel electrode, the rotation of control liquid crystal, thereby show different gray level images, and a Cs who is formed by pixel electrode and storage electrode (memory capacitance), for the voltage that keeps pixel electrode.When showing image, grid drive IC (IntegratedCircuit, surface-mounted integrated circuit) adds a series of not overlapping sweep signals mutually on scan electrode, namely add positive bias line by line on the grid of TFT, make the TFT conducting simultaneously of this row, TFT changes low resistance state into by high-impedance state; Meanwhile, source drive IC delivers to view data to display on corresponding row on each signal electrode, so view data is the C by the TFT corresponding row of opening on this row just
LCCharging realizes liquid crystal display, and namely view data by the TFT of conducting, is sent on pixel electrode, and Cs stores and keep the voltage of this view data.After line scan signals finished, TFT turn-offed immediately, and stored data voltage will be held and continue to drive pixel liquid crystal, until the arrival again of lower frame scan signal.And other not the TFT of selected line be in all the time off state, view data is on not impact of the voltage on pixel wherein.Repeat so line by line just can demonstrate a two field picture.
Due to the existence of RC time-delay, there are certain difference in adjacent two row that polarity is identical, digital signal is identical or the actual output voltage Uo between multirow.In order to improve Dim-Line or the Dim-Block phenomenon that causes due to the RC time-delay, as shown in Figure 2, the embodiment of the present invention provides a kind of device that improves liquid crystal display Dim-Line or Dim-Block phenomenon, and this device comprises: sampling comparing unit 1 and compensating unit 2,
Particularly, sampling comparing unit 1 is connected with pixel electrode in liquid crystal panel sub-pix unit, compares with a certain setting value V1 for the actual output voltage Uo of the sub-pix unit that sampling the is obtained difference voltage Δ V that obtains that compares with la tension de reference Uref est; If described compensating unit 2 is used for difference voltage Δ V greater than above-mentioned setting value V1, latchs this difference voltage Δ V, and when next frame, compensate described difference voltage Δ V to described sub-pix unit; If described difference voltage Δ V is less than or equal to described setting value V1, uncompensation.Wherein, sampling comparing unit 1 can connect respectively the sub-pix unit that at least one need to compensate, and the actual output voltage Uo of the sub-pix unit that connects is sampled respectively.Namely as required, according to set rule, the sub-pix unit of choosing a certain quantity is connected with sampling comparing unit 1, for example can choose 1,3, the sub-pix unit of 5......n row, is connected with sampling comparing unit 1 respectively.
For source drive IC, the sub-pix unit of the corresponding same row of same output channel, therefore, for for the sub-pix unit of delegation, can determine different sub-pix unit by different output channels, therefore, in the sampling that is easier on TFT to realize to the data on the sub-pix unit of delegation, namely to the actual sampling that is added in each pixel liquid crystal two end data, implementation can for: in sequential control, for the content of each sub-pix unit demonstration, by the register address record.Like this, the data of identical register record are compared, can compare expectation input voltage that the RC time-delay due to liquid crystal panel causes and the difference of actual output voltage Uo.
in the technical scheme of the present embodiment, introduced the sample line to memory capacitance Cs, utilize the sampling comparison module that the rows and columns data of different range on liquid crystal panel are sampled, the actual output voltage reference voltage corresponding with the grey level of its expectation input voltage that sampling the is obtained difference voltage that draws of comparing need to judge whether compensation, in this difference voltage during greater than a certain setting value, by compensating module compensate for poor threshold voltage to the data line of the sub-pix unit of needs compensation, thereby the Dim-Line or the Dim-Block phenomenon that extremely cause due to RC have been reduced, and its circuit is realized simple, for ease of maintenaince.
Further, as shown in Figure 3, sampling comparing unit 1 comprises: controlling of sampling module 11, be used for the actual output voltage Uo that sampling obtains the sub-pix unit, wherein, the function of controlling of sampling module 11 can realize by time schedule controller, and implementation is state machine or DLC (digital logic circuit); The first comparison module 12 is used for described actual output voltage is compared with la tension de reference Uref est, obtains difference voltage Δ V; The second comparison module 13 is used for described difference voltage Δ V is compared with setting value V1.Wherein, the function of the second comparison module can be by the analog voltage comparator realization that is provided with setting value V1, and this analog voltage comparator can be arranged on drive integrated circult intralamellar part or liquid crystal panel.
Further, as shown in Figure 4, the function of above-mentioned compensating unit 2 can be realized by the compensating circuit that controlled by time schedule controller, in the present embodiment, is preferably realized by the charge pump circuit 22 that is connected with pulsating wave conversion chip 21.
Particularly, adopt device that the present embodiment provides to realize improving the process of liquid crystal display Dim-Line or Dim-Block phenomenon as follows:
As shown in Figure 4, the sampling of controlling of sampling module controls, the actual output voltage Uo that obtains of sampling deliver to carry out in sampling comparing unit 1 analog to digital conversion and relatively after, further carry out again digital-to-analog conversion, and use an analog voltage comparator, to be compared with la tension de reference Uref est by the aanalogvoltage Ui that actual output voltage Uo obtains, wherein, la tension de reference Uref est is the reference voltage with fixed value (be each a GTG corresponding fixing reference voltage level) corresponding with GTG.In high gray scale part, because picture itself brightens, so when difference increases, can not allow people's vision feel to some extent; In low gray scale part, take the gray scale difference of adjacent gray scale as 7mV as standard, setting value V1=7mV is set.When difference | during Δ V|=|Ui-Uref|＜7mV, need not compensation, when next frame, output actual output voltage Uo; And when difference | during Δ V|=|Ui-Uref|＞V1=7mV, need compensation this moment, difference voltage Δ V is latched, when next frame, with the input end of the V of Δ as a result relatively as pulsating wave conversion chip 21, this pulsating wave conversion chip 21 can be realized by 8038, the pulsating wave DltV of output is as an end input of charge pump circuit 22, the output voltage V bc after the compensation as far as possible near la tension de reference Uref est, exports the output voltage V bc after compensation, i.e. Vbc=Uo ≈ Uref as actual output voltage.
Charge pump circuit as shown in Figure 5, charge pump circuit comprises two input end B, E and an output terminal C, particularly, input end B input be the voltage V of current data line output
DataThat input end E inputs is DltV, and as the compensation transformation of charge pump circuit, this pulsating wave DltV is provided by the pulsating wave conversion chip by the difference comparison; Output terminal C outputs to the output voltage V bc after compensation on data line.V
COMThe voltage (not shown) is as the reference voltage of charge pump circuit, directly by the V of liquid crystal panel
COMSubstrate provides.When needs compensation Δ V, as shown in Figure 3, the selecting side A of data line connects the input end B of charge pump, electric charge delivery side of pump C connection data line D end, output voltage V bc after charge pump will compensate by output terminal C outputs on data line, and pixel cell shows the output voltage V bc after compensation; And when not needing to compensate, the direct connection data line of the selecting side A D of data line end, pixel cell shows the voltage V by data line output
Data
Common A/D conversion is subjected to the restriction of sequential organization instruction cycle, slewing rate is generally the 1000us left and right, far can not satisfy the frequency of digital signal in liquid crystal display, and A/D converter at a high speed, again take with high storage space and expensive as cost, and the A/D controlling of sampling in this programme is carried out work with the method for work of streamline, and it starts once sampling at each clk cycle, completes once sampling.Particularly, as shown in Figure 6, each to start sampling be that negative edge at CLK carries out, and the output of sample conversion result if calculate upper output time-delay Tdd, need to be passed through 2.5xTclk+Tdd from sampling output after 2.5 clk cycles.For the controlling of sampling module of needs design, can think, often add a sampling clk cycle, A/D will export a sampled data.
Can describe the controlling of sampling process with state machine according to its sampling time sequence, as shown in Figure 7 and Figure 8, when state st0, give the rising edge of a sampling clock Adck of A/D, latch simultaneously the output of A/D; At state St1, provide controlling of sampling module data output latch signal.The output of A/D controlling of sampling module has 4 signals:
Adck: the A/D sampling clock is provided.
Adoe: Enable Pin, continuously effective.
Data: sampled data output.
Dclk: be used for the output of synchrodata, can be used as the latch signal of the data of next stage.
Time schedule controller receives that finally feedack comprises the pixel that the rear data of sampling change, after recording this position by the address of register, when the next frame data, make the voltage that exports on module, maximum and reference voltage (Gamma reference voltage) approaches, namely when needs compensate, the compensate for poor threshold voltage.For different gray scale pictures, difference voltage relatively is different, after monitoring N hardwood data, time schedule controller is also different to the adjusting of output digit signals, to guarantee under different gray scale pictures, each interchannel output difference of drive IC is dropped to minimum, and can not deviate from reference voltage.Because the time of one second is very of short duration for the visual sense feeling of human eye, the opening time of delegation is 21.7us as an example of 1024*768 resolution example, the time of one hardwood is 16.67ms, on this basis, to there be the picture of 3.6 hardwoods to finish in 1s, and the data that sample for time schedule controller, the time of 4 hardwoods is enough to complete the compensation to difference, furthermore, even ceaselessly the time of image switching at least also should be more than 2s for people, therefore, for the compensation of different gray scale difference values and to complete be can not be subject to the impact of different gray scales.
in addition, generally the difference between gray scale is the 7mv left and right, when surpassing 10mv, human eye has perception, take with the difference of reference voltage as 50mv difference as example, differ about 5 gray scales, namely with low gray count, the chances are in Gray level 7 left and right, and be very little in the difference of low gray scale input, there is experimental data to show, the tonal range that Dim-Line or Dim-block occur is between G16～G48, being scaled gray scale is exactly between Gray level 64～Gray level192, so, the part of low gray scale can't affect the enforcement of this programme.Thereby the control that this programme is namely sampled by A/D farthest reduces a kind of scheme of Dim-Line or Dim-Block phenomenon.
Further, generally, as shown in Figure 9, in whole liquid crystal panel, the multiple district of Dim-Line or Dim-Block concentrates on the zone away from grid drive IC and source drive IC, if whole liquid crystal panel is compensated, can increase the circuit structure of liquid crystal panel, make design and the preparation of array base palte become comparatively complicated, in this programme, emphasis compensates multiple district, can simplify the design of liquid crystal panel.
As shown in figure 10, the embodiment of the present invention provides a kind of method that said apparatus improves liquid crystal display Dim-Line or Dim-Block phenomenon of using, and the method comprises:
If the described difference voltage of step 102 latchs described difference voltage greater than described setting value, and when next frame, compensate described difference to described sub-pix unit; If described difference voltage is less than or equal to described setting value, uncompensation.
Further, as shown in figure 11, step 101 comprises:
In the technical scheme of the present embodiment, sample by the rows and columns data to different range on liquid crystal panel, the actual output voltage reference voltage corresponding with the grey level of its expectation input voltage that sampling the is obtained difference voltage that draws of comparing need to judge whether compensation, in this difference voltage during greater than a certain setting value, the compensate for poor threshold voltage to the data line of the sub-pix unit of needs compensation, thereby reduced Dim-Line or the Dim-Block phenomenon that extremely causes due to RC.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but in a lot of situation, the former is better embodiment.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk as computing machine, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (8)
1. a device that improves the light gray line of liquid crystal display or light grey piece phenomenon, is characterized in that, comprising: sampling comparing unit and compensating unit,
Described sampling comparing unit is connected with pixel electrode in liquid crystal panel sub-pix unit, and the actual output voltage of the sub-pix unit that is used for sampling the is obtained difference voltage that obtains of comparing with reference voltage is compared with a certain setting value;
If described compensating unit is used for described difference voltage greater than described setting value, latchs described difference voltage, and when next frame, compensate described difference voltage to described sub-pix unit; If described difference voltage is less than or equal to described setting value, uncompensation;
Wherein, the function of described compensating unit is realized by charge pump circuit, described charge pump circuit comprises two input ends and an output terminal, an input end in described two input ends is used for receiving the described difference voltage from described sampling comparing unit after the conversion of pulsating wave conversion chip, another input end be used for to receive the voltage of current data line output, and described output terminal connects described sub-pix unit by data line.
2. device according to claim 1, is characterized in that, described sampling comparing unit comprises:
The controlling of sampling module is used for the actual output voltage that sampling obtains the sub-pix unit;
The first comparison module is used for described actual output voltage is compared with described reference voltage, obtains difference voltage;
The second comparison module is used for described difference voltage is compared with described setting value.
3. device according to claim 2, is characterized in that, the function of described controlling of sampling module is realized by time schedule controller.
4. device according to claim 3, is characterized in that, the function of described controlling of sampling module realizes by time schedule controller, and implementation is state machine or DLC (digital logic circuit).
5. device according to claim 2, is characterized in that, the function of described the second comparison module is realized by the analog voltage comparator that is provided with described setting value.
6. device according to claim 5, is characterized in that, described analog voltage comparator is arranged on drive integrated circult intralamellar part or liquid crystal panel.
7. a method of improving the light gray line of liquid crystal display or light grey piece phenomenon, is characterized in that, comprising:
The actual output voltage of the sub-pix unit difference voltage that obtains of comparing with reference voltage is compared with a certain setting value;
If described difference voltage greater than described setting value, latchs described difference voltage, and when next frame, compensate described difference to described sub-pix unit by charge pump circuit; If described difference voltage is less than or equal to described setting value, uncompensation;
Wherein, described charge pump circuit comprises two input ends and an output terminal, an input end in described two input ends is used for receiving the described difference voltage from the sampling comparing unit after the conversion of pulsating wave conversion chip, another input end be used for to receive the voltage of current data line output, and described output terminal connects described sub-pix unit by data line.
8. method according to claim 7, is characterized in that, compare with the reference voltage difference voltage that obtains of described actual output voltage with the sub-pix unit is compared with a certain setting value and comprised:
Sampling obtains the actual output voltage of sub-pix unit;
Described actual output voltage is compared with described reference voltage, obtain difference voltage;
Described difference voltage is compared with described setting value.
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| CN104505026B (en) * | 2015-01-08 | 2018-01-02 | 二十一世纪（北京）微电子技术有限公司 | Grayscale voltage adjusts circuit and interlock circuit and device |
| CN104766579B (en) * | 2015-04-17 | 2017-10-24 | 京东方科技集团股份有限公司 | A kind of signal output apparatus, display panel and display device |
| CN104882113B (en) * | 2015-06-25 | 2018-03-27 | 京东方科技集团股份有限公司 | Correct drive circuit, liquid crystal display device and the driving method of LCD display effects |
| TWI545545B (en) * | 2015-07-23 | 2016-08-11 | 晶宏半導體股份有限公司 | Source driving method and circuit for electro-phoretic display |
| CN105632396B (en) * | 2016-03-04 | 2018-08-07 | 京东方科技集团股份有限公司 | A kind of gray scale voltage calibrating installation, system, method and display device |
| CN109493784A (en) * | 2018-12-25 | 2019-03-19 | 福建华佳彩有限公司 | A kind of circuit structure of over-speed compensation pixel electrode voltage and its compensation method |
| CN111679520A (en) * | 2020-06-01 | 2020-09-18 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
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