CN109345989A - A kind of driving method detecting liquid crystal display panel - Google Patents
A kind of driving method detecting liquid crystal display panel Download PDFInfo
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- CN109345989A CN109345989A CN201811452835.5A CN201811452835A CN109345989A CN 109345989 A CN109345989 A CN 109345989A CN 201811452835 A CN201811452835 A CN 201811452835A CN 109345989 A CN109345989 A CN 109345989A
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- Prior art keywords
- voltage
- liquid crystal
- crystal display
- display panel
- driving method
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
Abstract
The invention discloses a kind of driving methods for detecting liquid crystal display panel, the failing edge of the scanning signal of liquid crystal display panel is controlled, the corresponding voltage value of the failing edge includes first voltage and second voltage, wherein the first voltage is greater than the starting voltage of thin film transistor (TFT)；The second voltage is less than the closing voltage of thin film transistor (TFT)；Multiple decline steps are set by the first voltage to second voltage.The present invention is for the bad problem of display that large scale liquid crystal panel occurs in the detection process in the prior art, pass through the corresponding voltage of Discrete control scanning signal failing edge, it is bad that the display such as split screen, piecemeal can be effectively reduced, to identify the display problem of the liquid crystal display panel physical presence.
Description
Technical field
The present invention relates to technical field of liquid crystal display, more particularly to a kind of driving method for detecting liquid crystal display panel.
Background technique
In LCD manufacturing process, array substrate and color membrane substrates detect the liquid crystal display panel formed after box, in electric-examination
In process, multiple specific detection pictures need to be shown on panel, visual inspection is with the presence or absence of various bad (such as points, line, various
It shows bad etc.).In the detection during large scale (12 " or more such as) liquid crystal display panel, generally driven using second order voltage
Scanning signal is controlled, is easy to appear split screen, piecemeal through experiments, it was found that detect using which, and blocky display is unequal
Abnormal phenomenon.
In view of the above-mentioned problems, needing using a kind of different from conventional liquid crystal display panel driving method, so that liquid crystal display panel is aobvious
When showing picture, such split screen is reduced or eliminated to the greatest extent, piecemeal shows undesirable situation to avoid liquid crystal display panel resulting from not
Non-defective unit missing inspection.
Summary of the invention
At least one to solve the above-mentioned problems, the present invention provides a kind of driving method for detecting liquid crystal display panel, to liquid crystal
The failing edge of the scanning signal of panel is controlled, and the corresponding voltage value of the failing edge includes first voltage and second voltage,
Wherein
The first voltage is greater than the starting voltage of thin film transistor (TFT)；
The second voltage is less than the closing voltage of thin film transistor (TFT)；
Multiple decline steps are set by the first voltage to second voltage.
Further, the number of the decline step is greater than 10, and the total duration of the multiple failing edge is greater than
100us。
Further, the corresponding voltage value of each decline step is identical in the multiple decline step.
Further, the duration of each decline step is identical.
Further, the failing edge of scanning signal controls for single hop or multistage controls, wherein
When single hop controls, the first voltage is the initial voltage of the failing edge, and the second voltage is the decline
The blanking voltage on edge；
When multistage controls, the first voltage is less than the initial voltage of the failing edge and/or the second voltage is greater than
The blanking voltage of the failing edge.
Further, the rising edge of the scanning signal of liquid crystal display panel is controlled, the corresponding voltage value of the rising edge
Including tertiary voltage and the 4th voltage, wherein
The tertiary voltage is less than the closing voltage of thin film transistor (TFT)；
4th voltage is greater than the starting voltage of thin film transistor (TFT)；
Multiple rising steps are set to the 4th voltage by the tertiary voltage；The number for rising step is greater than 10,
The total duration of the multiple rising edge is greater than 100us.
Further, the corresponding voltage value of each rising step is identical in the multiple rising step；
And/or
Each duration for rising step is identical.
Further, the rising edge of scanning signal controls for single hop or multistage controls, wherein
When single hop controls, the tertiary voltage is the initial voltage of the rising edge, and the 4th voltage is the rising
The blanking voltage on edge；
When multistage controls, the tertiary voltage is greater than the initial voltage of the failing edge and/or the 4th voltage is less than
The blanking voltage of the rising edge.
Further, when the scanning signal of the liquid crystal display panel is divided into multiple groups signal, the waveform of each scanning signal is kept
Unanimously.
Further, when the adjustment of the common voltage of the liquid crystal display panel, the first voltage, second voltage, third electricity
Pressure and the 4th voltage are according to the corresponding adjustment of the adjustment of common voltage progress.
Beneficial effects of the present invention are as follows:
The present invention is provided for the bad problem of display that large scale liquid crystal panel occurs in the detection process in the prior art
The failing edge of the scanning signal of liquid crystal display panel is carried out Discrete control to improve and disappear by a kind of driving method for detecting liquid crystal display panel
Except the split screen of large scale liquid crystal panel, piecemeal, and the abnormal phenomenon that blocky display is uneven, to identify that the liquid crystal display panel is real
Display problem existing for border.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 shows the drive waveforms schematic diagram for detecting liquid crystal display panel in the prior art；
Fig. 2 a-b shows the undesirable schematic diagram of display for detecting liquid crystal display panel in the prior art；
Fig. 3 shows the drive waveforms schematic diagram that liquid crystal display panel is detected described in one embodiment of the present of invention；
Fig. 4 shows the waveform diagram of steer step waveform described in one embodiment of the present of invention；
Fig. 5 shows the drive waveforms schematic diagram that liquid crystal display panel is detected described in another embodiment of the invention.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
It is as shown in Figure 1 the drive waveforms for detecting liquid crystal display panel in the prior art, the drive waveforms are in lighting smaller size
Picture is all gone well when liquid crystal display panel；However when detecting large scale liquid crystal panel in lighting, due to each producer's different process etc.
The factor of various aspects, in the detection process should the consistent grey menu of brightness it sometimes appear that as split screen in Fig. 2 a, Fig. 2 b, point
The abnormal shows such as block.Above-mentioned abnormal show makes brightness throughout difference in the display picture of liquid crystal display panel very big, and liquid crystal display panel
Much displays it is bad require under whole-screen brightness uniform picture, by the bad point of the liquid crystal display panel physical presence or not
Good region and surrounding normal region form obvious comparison, to could be identified when visual inspection or image recognition automatically process
Out；Meanwhile if showing in defective region in split screen and piecemeal there are actual dim spot, bright spot, concealed wire, bright line, be difficult by
The case where identifying, be easy to causeing missing inspection.
According to the above problem, one embodiment of the present of invention provides a kind of driving method for detecting liquid crystal display panel, such as Fig. 3 institute
Show, the failing edge of the scanning signal of liquid crystal display panel is subjected to Discrete control, the corresponding voltage value of the failing edge includes the first electricity
V1 and second voltage V2 is pressed, wherein the first voltage is greater than the starting voltage of thin film transistor (TFT)；The second voltage is less than thin
The closing voltage of film transistor；Multiple decline steps are set by the first voltage to second voltage.
In a specific embodiment, it closes (i.e. failing edge) process to scanning signal to control, and to the first electricity
It presses V1 to second voltage V2 to divide step and carries out Stepped control.
When scanning signal is greater than starting voltage (the usually about 5V) of thin film transistor (TFT), thin film transistor (TFT) is fully opened,
Data line is connected to completely with the pixel unit of liquid crystal display panel at this time, no matter the variation of scanning signal, is all kept inside pixel unit
Voltage identical with data line, at this time the parasitic capacitance Cgd between the grid and drain electrode of thin film transistor (TFT) to show electrode voltage without
It influences, therefore the starting voltage of thin film transistor (TFT) is defined as first voltage, when scanning signal is greater than this voltage, scanning signal
Influence of the variation to show electrode can ignore.Similar, when the closing voltage that scanning signal is less than thin film transistor (TFT) is (logical
Often about -3V) when, the variation of the scanning signal has no significant effect the display picture of panel, therefore by thin film transistor (TFT)
It closes voltage and is defined as second voltage.
As shown in figure 4, first voltage to second voltage is divided into multiple steps, each one tentering of pressure drop of scanning signal
Value is kept for a period of time at each amplitude (i.e. each step), operated repeatedly, until the scanning signal is completely into pass
Close voltage.Calculating and actual experiment measurement through the R&D personnel, the quantity of the multiple step are greater than 10, the decline platform
The total duration of rank is greater than 100us, and the quantity of the step is bigger, duration more long then parasitic capacitance Cgd is to aobvious
Show that the influence of electrode is also smaller.It is equivalent to the scanning signal and keeps a period of time after each pressure drop to reach the steady of centre
State then converts lasting small changes multiple for a long time from a transient state great variety before for first voltage to second voltage
The voltage variety of the steady-state process of change, each scanning signal is smaller, then coupling effect of the parasitic capacitance Cgd to show electrode
Influence also smaller, that is, influence of the parasitic capacitance Cgd to show electrode be just during solving the first voltage to second voltage
The problem of being able to solve above-mentioned abnormal show.Although characteristics and other portions such as the parasitic capacitances of such liquid crystal display panel exposure seam crossing
Point have difference, but from visually for, thus difference in brightness caused by difference can be ignored, the split screen, blockiness base
This disappearance.
In a preferred embodiment, it is contemplated that the scanning signal is Cgd pairs of parasitic capacitance in each pressure drop process
The influence of show electrode is smaller, it is more stable more to mitigate, the corresponding voltage value phase of each decline step in the multiple decline step
Together.Such as setting decline number of steps is 10, the drop-out voltage of each step is voltage difference of the first voltage to second voltage
10%.Further, the duration of each decline step is identical, such as setting decline number of steps is 10, when always continuing
Between be 100us, then it is each decline step duration be 10us, parasitic capacitance Cgd has been effectively relieved to the shadow of show electrode
It rings.
In another preferred embodiment, the failing edge of scanning signal is that single hop controls or multistage controls, wherein single hop
When control, the first voltage is the initial voltage of the failing edge, and the second voltage is the blanking voltage of the failing edge；
When multistage controls, the first voltage is less than the initial voltage of the failing edge and/or the second voltage is greater than the decline
The blanking voltage on edge.The failing edge of the i.e. described scanning signal is segmented into a variety of situations:
First, the failing edge of the scanning signal is single hop control, and the first voltage V1 is the initial of the failing edge
Voltage VGH, the second voltage V2 are the blanking voltage VGL of the failing edge.It is i.e. that the failing edge of the scanning signal is whole
Stepped control is carried out by dividing step, further stablizes influence of the parasitic capacitance Cgd to show electrode.
Second, the failing edge of the scanning signal is multistage control: the first voltage V1 is the initial of the failing edge
Voltage VGH, the second voltage V2 are greater than the blanking voltage of the failing edge；Or the first voltage V1 is less than the decline
The initial voltage VGH, the second voltage V2 on edge are the blanking voltage of the failing edge；Or the first voltage V1 is less than institute
The initial voltage VGH, the second voltage V2 for stating failing edge are greater than the blanking voltage of the failing edge.It is worth noting that institute
It states failing edge to be not limited to only be divided by first voltage V1 and second voltage V2, can also include other waypoints.
It is corresponding with above-described embodiment, as shown in figure 5, in another preferred embodiment, being swept to liquid crystal display panel
The rising edge for retouching signal is controlled, and the corresponding voltage value of the rising edge includes tertiary voltage and the 4th voltage, wherein described
Tertiary voltage is less than the closing voltage of thin film transistor (TFT)；4th voltage is greater than the starting voltage of thin film transistor (TFT)；It will be described
Tertiary voltage is set as multiple rising steps to the 4th voltage；The number for rising step is greater than 10, the multiple rising edge
Total duration be greater than 100us.
Further, the corresponding voltage value of each rising step is identical in the multiple rising step；Or it is each described
The duration for rising step is identical；Or the corresponding voltage value of each rising step is identical in the multiple rising step, and
And the duration of each rising step is identical.
Further, the rising edge of scanning signal is that single hop controls or multistage controls, when wherein single hop controls, the third
Voltage is the initial voltage of the rising edge, and the 4th voltage is the blanking voltage of the rising edge；It is described when multistage controls
Tertiary voltage is less than the blanking voltage of the rising edge greater than the initial voltage of the failing edge and/or the 4th voltage.Before
It states embodiment and bring beneficial effect is equally applicable to the present embodiment therewith, therefore, identical part repeats no more.
In a preferred embodiment, when the scanning signal of the liquid crystal display panel is divided into multiple groups signal, each scanning letter
Number waveform be consistent.For large scale liquid crystal panel, scanning signal is scanned pixel unit by row, to meet liquid crystal display panel
Narrow frame integrated gate drive circuitry usually is set in the two sides of array substrate, such as scanning signal is divided into two groups, four groups
Even controlled for eight groups.In the case, each group of scanning signal of the liquid crystal display panel is divided according to identical waveform
Section control, the Stepped control for dividing step can be effectively improved or eliminate above-mentioned split screen, piecemeal, and the blocky unequal exception of display
Phenomenon, and can be avoided non-defective unit erroneous detection caused by thus phenomenon or defective products missing inspection.
In another preferred embodiment, when the adjustment of the common voltage of the liquid crystal display panel, the first voltage, the
Two voltages, tertiary voltage and the 4th voltage carry out corresponding adjustment according to the adjustment of the common voltage.In certain detections or reality
In the application scenarios of border, to realize preferably detection or application effect, common voltage is often carried out to the biasing of certain amplitude, herein
In the case of, first voltage, second voltage, tertiary voltage and the 4th voltage in the present embodiment should also be as the tune according to common voltage
Perfect square is to being adjusted correspondingly, such as common voltage is biased to 1V from 0V, then corresponding first voltage, second voltage, third
Voltage and the 4th voltage also forward bias 1V to meet the needs of detection.
The present invention is directed to the bad problem of display that existing large scale liquid crystal panel occurs in the detection process, provides a kind of inspection
The failing edge of the scanning signal of liquid crystal display panel is carried out Discrete control by the driving method for surveying liquid crystal display panel, can be effectively improved or
The situation of the block such as above-mentioned split screen, piecemeal unevenness is eliminated, avoids erroneous detection caused by this phenomenon or defective products missing inspection as far as possible.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (10)
1. a kind of driving method for detecting liquid crystal display panel, which is characterized in that carried out to the failing edge of the scanning signal of liquid crystal display panel
Control, the corresponding voltage value of the failing edge include first voltage and second voltage, wherein
The first voltage is greater than the starting voltage of thin film transistor (TFT)；
The second voltage is less than the closing voltage of thin film transistor (TFT)；
Multiple decline steps are set by the first voltage to second voltage.
2. driving method according to claim 1, which is characterized in that the number of the decline step is described more greater than 10
The total duration of a failing edge is greater than 100us.
3. driving method according to claim 2, which is characterized in that each decline step pair in the multiple decline step
The voltage value answered is identical.
4. driving method according to claim 2, which is characterized in that the duration of each decline step is identical.
5. driving method described in any one of -4 according to claim 1, which is characterized in that the failing edge of scanning signal is single hop
Control or multistage control, wherein
When single hop controls, the first voltage is the initial voltage of the failing edge, and the second voltage is the failing edge
Blanking voltage；
When multistage controls, the first voltage is greater than described less than the initial voltage of the failing edge and/or the second voltage
The blanking voltage of failing edge.
6. driving method according to claim 5, which is characterized in that carried out to the rising edge of the scanning signal of liquid crystal display panel
Control, the corresponding voltage value of the rising edge include tertiary voltage and the 4th voltage, wherein
The tertiary voltage is less than the closing voltage of thin film transistor (TFT)；
4th voltage is greater than the starting voltage of thin film transistor (TFT)；
Multiple rising steps are set to the 4th voltage by the tertiary voltage；The number for rising step is described greater than 10
The total duration of multiple rising edges is greater than 100us.
7. driving method according to claim 6, which is characterized in that each rising step pair in the multiple rising step
The voltage value answered is identical；
And/or
Each duration for rising step is identical.
8. driving method according to claim 7, which is characterized in that the rising edge of scanning signal is single hop control or multistage
Control, wherein
When single hop controls, the tertiary voltage is the initial voltage of the rising edge, and the 4th voltage is the rising edge
Blanking voltage；
When multistage controls, the initial voltage and/or the 4th voltage that the tertiary voltage is greater than the failing edge are less than described
The blanking voltage of rising edge.
9. driving method according to claim 8, which is characterized in that when the scanning signal of the liquid crystal display panel is divided into multiple groups
When signal, the waveform of each scanning signal is consistent.
10. driving method according to claim 9, which is characterized in that when the adjustment of the common voltage of the liquid crystal display panel,
The first voltage, second voltage, tertiary voltage and the 4th voltage carry out corresponding adjustment according to the adjustment of the common voltage.
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| CN201811452835.5A CN109345989A (en) | 2018-11-30 | 2018-11-30 | A kind of driving method detecting liquid crystal display panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811452835.5A CN109345989A (en) | 2018-11-30 | 2018-11-30 | A kind of driving method detecting liquid crystal display panel |
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| CN106023935A (en) * | 2016-07-27 | 2016-10-12 | 深圳市华星光电技术有限公司 | Liquid crystal display device and driving method thereof |
| CN107121862A (en) * | 2017-06-23 | 2017-09-01 | 深圳市华星光电技术有限公司 | Liquid crystal panel and its driving display methods |
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2018
- 2018-11-30 CN CN201811452835.5A patent/CN109345989A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640030A (en) * | 2008-07-29 | 2010-02-03 | 三星电子株式会社 | Display device having reduced waterfall noise |
| CN102117593A (en) * | 2009-12-30 | 2011-07-06 | 乐金显示有限公司 | Display device and method for controlling gate pulse |
| CN103426388A (en) * | 2012-05-23 | 2013-12-04 | 三星显示有限公司 | Display device and driving method thereof |
| US20160055828A1 (en) * | 2014-08-25 | 2016-02-25 | Innolux Corporation | Display devices and driving circuit |
| CN106023935A (en) * | 2016-07-27 | 2016-10-12 | 深圳市华星光电技术有限公司 | Liquid crystal display device and driving method thereof |
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