WO2018201569A1 - 栅极关断电压的调整方法、装置及显示设备 - Google Patents

栅极关断电压的调整方法、装置及显示设备 Download PDF

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Publication number
WO2018201569A1
WO2018201569A1 PCT/CN2017/088739 CN2017088739W WO2018201569A1 WO 2018201569 A1 WO2018201569 A1 WO 2018201569A1 CN 2017088739 W CN2017088739 W CN 2017088739W WO 2018201569 A1 WO2018201569 A1 WO 2018201569A1
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Prior art keywords
contrast
display panel
voltage
brightness
initial
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Ceased
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PCT/CN2017/088739
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English (en)
French (fr)
Inventor
陈猷仁
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HKC Co Ltd
Chongqing HKC Optoelectronics Technology Co Ltd
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HKC Co Ltd
Chongqing HKC Optoelectronics Technology Co Ltd
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Priority to US16/610,862 priority Critical patent/US10978015B2/en
Publication of WO2018201569A1 publication Critical patent/WO2018201569A1/zh
Anticipated expiration legal-status Critical
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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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • Embodiments of the present disclosure relate to the field of display driving technologies, and in particular, to a method, an apparatus, and a display device for adjusting a gate turn-off voltage.
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • the main driving principle of TFT-LCD is that the system board connects the R/G/B compression signal and control signal through the wire to the connector on the control board (C-Board), and the data signal and control signal pass through the control board.
  • the Timing Controller (TCON) IC is processed and transmitted to the PCB through a Flexible Flat Cable (FFC), and then passed through a Source-Chip on Film (S-COF) and a gate.
  • S-COF Source-Chip on Film
  • G-COF gate-chip on film
  • the G-COF output is used to turn on or off the voltage of a Thin Film Transistor (TFT) of the array substrate, but the transfer characteristics of the TFT element as a pixel switch may change with time, that is, the TFT element
  • TFT element The relationship between the electron mobility and the gate voltage will change. After a period of time, the optimal gate turn-off voltage of the TFT element will also change. Therefore, after a period of time, the gate turn-off will be incomplete, resulting in TFT.
  • the pixel display contrast of the display area of the LCD is lowered.
  • the present disclosure provides a method, an apparatus, and a display device for adjusting a gate turn-off voltage to solve the problem that the display panel loses its working time, and the gate of the thin film transistor is not completely turned off, resulting in a decrease in pixel display contrast of the display region.
  • Embodiments of the present disclosure provide a method for adjusting a gate turn-off voltage, including:
  • the contrast is compared to an initial contrast, and if the difference between the contrast and the initial contrast is greater than a set threshold, the gate turn-off voltage of the display panel is adjusted.
  • An embodiment of the present disclosure further provides an apparatus for adjusting a gate turn-off voltage, including:
  • a contrast detection module configured to obtain a contrast of display brightness of the display panel by using at least one photosensitive element
  • a voltage adjustment module connected to the contrast detection module, configured to compare the contrast with an initial contrast, and if the difference between the contrast and the initial contrast is greater than a set threshold, the gate of the display panel is closed The voltage is adjusted.
  • Embodiments of the present disclosure also provide a display device including a display panel, and a device for adjusting a gate turn-off voltage according to any of the embodiments of the present disclosure.
  • the contrast of the display panel display brightness is obtained by the at least one photosensitive element, and the contrast is compared with the initial contrast of the display panel. If the difference between the contrast and the initial contrast is greater than the set threshold, the display is performed. The gate turn-off voltage of the panel is adjusted. The problem that the gate of the thin film transistor of the display panel is not turned off completely due to the increase of the working time, and the pixel display contrast of the display area is lowered is solved.
  • FIG. 1a is a flowchart of a method for adjusting a gate turn-off voltage according to an embodiment of the present disclosure
  • FIG. 1b is a transfer characteristic diagram of a TFT element according to an embodiment of the present disclosure
  • FIG. 2a is a flowchart of another method for adjusting a gate turn-off voltage according to an embodiment of the present disclosure
  • FIG. 2b is a structural diagram of a terminal device including a display panel according to an embodiment of the present disclosure
  • 2c is a structural diagram of another terminal device including a display panel according to an embodiment of the present disclosure.
  • FIG. 3 is a structural diagram of an apparatus for adjusting a gate turn-off voltage according to an embodiment of the present disclosure
  • FIG. 3b is a structural diagram of another apparatus for adjusting a gate turn-off voltage according to an embodiment of the present disclosure
  • FIG. 4 is a structural diagram of a display device according to an embodiment of the present disclosure.
  • FIG. 1A is a flowchart of a method for adjusting a gate turn-off voltage according to an embodiment of the present disclosure.
  • the method of this embodiment can be performed by an adjustment device for the gate turn-off voltage.
  • the method for adjusting the gate turn-off voltage provided in this embodiment specifically includes steps S110 to S120.
  • step S110 the contrast of the display panel display brightness is acquired by at least one photosensitive element.
  • the display panel may be, for example, an LCD display panel, an OLED display panel, a QLED display panel, or other display panel.
  • the thin film transistor TFT has a transfer characteristic which changes with the increase of the working time.
  • the transfer characteristic of the TFT is the electron mobility of the TFT with the gate electricity.
  • each gate voltage value corresponds to a different electron mobility.
  • the electron mobility tends to change at the same gate voltage value of the TFT element.
  • the gate voltage of the display panel when the electron mobility is minimum at the initial time is V0, and after the display panel is operated for a period of time, if the gate voltage is still V0, the electron mobility is not minimum.
  • FIG. 1B is a transfer characteristic diagram of a TFT element.
  • the transfer characteristic curve of the TFT element is curve 1.
  • the transfer characteristic curve of the TFT element is curve 2, and the transfer characteristic curve of the TFT element is shifted to the right with time. .
  • the TFT element When the TFT element is turned off, the smaller the current, the better, because if the current is large, the TFT element is turned off incompletely, and the pixel electrode is still charged, so that the pixel cannot be in a dark state. Contrast is the ratio of the maximum and minimum values of the display brightness of the display panel. If the TFT element is not completely turned off, the minimum display brightness of the display panel will increase, and the contrast of the display panel will decrease, affecting the display effect of the display panel, and the display image is not clear.
  • the gate voltage (gate turn-off voltage) when the current is minimum is VGL1
  • the gate voltage when the current is minimum is VGL2.
  • the gate turn-off voltage of the TFT element of the display panel is a fixed value that has been set at the factory, and the contrast of the display panel gradually decreases with time, affecting the viewing effect, and the service life of the display panel is reduced.
  • the embodiment of the present disclosure sets the gate turn-off voltage of the TFT element a plurality of times according to the characteristic that the transfer characteristic curve of the TFT changes with time.
  • the contrast of the display panel display brightness is obtained by at least one photosensitive element.
  • the photosensitive element is capable of measuring and obtaining the maximum and minimum values of the display panel display brightness, thereby obtaining the contrast of the display panel.
  • the photosensitive element can be set to collect data of the brightness of the display panel at the initial moment of display on the display panel. Because the display device's system will cut at the initial moment of display on the display panel Change the darkest and brightest picture to facilitate the data collection of the photosensitive element, and when the display panel is displayed later, the photosensitive element can be turned off to save power and save operation.
  • the photosensitive element may be one or more.
  • the measurement result of each photosensitive element may be integrated to obtain an accurate contrast of the display panel display brightness.
  • the photosensitive element may be a photoresistor, a photosensitive optical fiber or an optical lens.
  • a photoresistor is a resistor made by utilizing the photoconductive effect of a semiconductor, which changes in accordance with the intensity of incident light, and is also called a photoconductive detector.
  • the incident light intensity, the resistance decreases, the incident light is weak, and the resistance increases; there is another kind of photoresistor whose incident light is weak, the resistance is reduced, the incident light intensity is strong, and the resistance is increased.
  • the maximum and minimum values of the brightness of the display panel are measured, thereby obtaining the contrast of the display panel.
  • Photosensitive fiber refers to an optical fiber that absorbs ultraviolet light and can be observed by the ultraviolet absorption spectrum of the optical fiber.
  • the absorption of ultraviolet light by the optical fiber induces a change in the refractive index of the optical fiber with the spatial distribution of the ultraviolet light intensity, which is called a photorefractive index change.
  • the core of the photosensitive fiber is typically a few moles of antimony or phosphorus incorporated into the quartz in order to increase the refractive index.
  • the display brightness of the display panel can be obtained according to the change of the refractive index of the photosensitive fiber, and the contrast is obtained.
  • the optical lens adopts an optical imaging structure to simulate the spectral response and receiving characteristics of the human eye, and continuously monitors the brightness in the field of view to obtain the minimum and maximum display brightness of the display panel.
  • step S120 the contrast is compared with an initial contrast, and if the difference between the contrast and the initial contrast is greater than a set threshold, the gate turn-off voltage of the display panel is adjusted.
  • the contrast is compared with the initial contrast.
  • the gate turn-off voltage selected at the initial time is the optimum value VGL1
  • the initial time has an optimum.
  • Contrast which is the initial contrast as described in this embodiment. If the difference between the measured contrast and the initial contrast is greater than the set threshold, the gate of the display panel is turned off. The pressure is adjusted so that the contrast is equal to the initial contrast or closer to the initial contrast.
  • the initial gate turn-off voltage is VGL1.
  • the gate turn-off voltage is still VGL1, the brightness of the display panel display brightness is reduced, and the gate turn-off voltage can be set.
  • VGL2 the contrast of the display panel display brightness is equal to the initial contrast.
  • the value of the set threshold is as small as possible.
  • it can be set to five percent of the initial contrast so that the gate turn-off voltage can be adjusted in time.
  • the measurement time can be directly obtained according to the relationship between the electron mobility and the gate turn-off voltage, and the relationship between the electron mobility and the contrast of the display brightness.
  • the contrast is the gate turn-off voltage value of the initial contrast, and then the gate turn-off voltage that shorts the gate drive is set to the gate turn-off voltage value calculated at this time.
  • the gate turn-off voltage value of each gear position is directly set according to the relationship between the electron mobility and the contrast. For example, after the display panel is operated for T time, the gate turn-off voltage value is set to a first gear, and after the display panel operates for 2T time, the gate turn-off voltage value is set to the second gear, and the specific gear position is The gate turn-off voltage value depends on the characteristics of the transfer characteristics of the TFT element over time.
  • the contrast of the display panel display brightness is obtained by the at least one photosensitive element, and the contrast is compared with the initial contrast of the display panel. If the difference between the contrast and the initial contrast is greater than the set threshold, the display is performed. The gate turn-off voltage of the panel is adjusted. The problem that the gate of the TFT of the display panel is not completely turned off due to the lapse of the working time, and the pixel display contrast of the display area is lowered.
  • FIG. 2A is a flowchart of another method for adjusting a gate turn-off voltage according to an embodiment of the present disclosure.
  • a plurality of photosensitive elements are applied to the method for adjusting the gate turn-off voltage.
  • the method for adjusting the gate turn-off voltage includes the step S210 to
  • step S210 The panel displays the maximum and minimum brightness values.
  • a plurality of photosensitive elements are provided, each of which measures the maximum and minimum values of the display brightness of the display panel, and can integrate the data of the display brightness measured by each photosensitive element to obtain an accurate contrast value.
  • FIG. 2B is a structural diagram of a terminal device including a display panel according to an embodiment of the present disclosure.
  • the photosensitive elements 3 are respectively disposed on the four edges of the rectangular display panel 2, or reference to FIG. 2C, which is a structural diagram of another terminal device including the display panel provided by the embodiment of the present disclosure, and the photosensitive elements 3 are respectively disposed on the rectangular display.
  • the four corners of the panel 2, or the photosensitive element 3 may be arbitrarily disposed at the edge of the display panel 2, or the display panel 2 may have other shapes, and the photosensitive elements 3 may be disposed on the display panel 2 in a regular or irregular order. edge.
  • step S220 the maximum and minimum values of the display brightness are respectively transmitted to the system main board or the control board, so that the system main board or the control board acquires multiple sets of contrast measurement according to the maximum and minimum values of the plurality of sets of the display brightness. And comparing the plurality of sets of contrast measurements to obtain the contrast.
  • Each photosensitive element can output the measured maximum and minimum brightness of the display brightness to the system main board or the control board respectively, and the system main board or the control board performs the contrast calculation according to the maximum value and the minimum value of the plurality of sets of display brightness.
  • the system main board or the control board obtains the contrast measurement values of the N display brightness by the maximum and minimum display brightness of the N groups of photosensitive elements, and then takes the N contrast measurement values to obtain the contrast value, for example, there are two photosensitivity Element M1 and M2, the maximum and minimum values of the display brightness measured by the photosensitive element M1 are H1 and L1, respectively, and the system main board or the control board obtains the contrast measurement value D1 by the formula H1/L1; the display brightness measured by the photosensitive element M2 The maximum and minimum values are H2 and L2, respectively, and the system board or control board obtains the contrast measurement value D2 by the formula H2/L2.
  • the system board or control board calculates the comparison value D by the formula (D1+D2)/2.
  • the contrast can be directly obtained from the data measured by one of the photosensitive elements, and then verified by the data measured by the other photosensitive elements.
  • the system board or control board passes the photoreceptor
  • the data measured by the piece M1 obtains the contrast D
  • the contrast D1 is measured by the photosensitive element M2. If the difference between the contrast D1 and the contrast D is larger than the set range, the photosensitive element is re-controlled to measure the display brightness.
  • the maximum value of the display brightness measured by the plurality of photosensitive elements may be first obtained, and the mean value thereof may be obtained.
  • the minimum value of the display brightness measured by the plurality of photosensitive elements is obtained, and the mean value thereof is obtained, and the maximum value is obtained.
  • the mean of the mean and minimum values gives the contrast of the displayed brightness.
  • step S230 comparing the contrast with the initial contrast, if the difference between the contrast and the initial contrast is greater than a set threshold, the gate turn-off voltage of the display panel is based on the initial gate turn-off voltage. , increase the set value one by one.
  • the set value may be set as an increment of each increase of the gate turn-off voltage when the difference between the measured contrast and the initial contrast is greater than a set threshold, wherein the set value may be a fixed value.
  • the set value can be as small as possible to ensure that the state in which the gate turn-off voltage is adjusted to the initial contrast is not missed.
  • the set value is increased based on the initial gate turn-off voltage, and then the current contrast is detected again, and it is determined whether the current contrast and the initial contrast difference are greater than If the threshold is greater than the set threshold, the set value is added based on the last gate turn-off voltage, that is, the set value is successively increased until the difference between the current contrast and the initial contrast is less than the set threshold.
  • the contrast of the display panel display brightness is obtained by a plurality of photosensitive elements to enhance the accuracy of the measurement result. And repeatedly measuring the contrast of the display panel display brightness, compared with the initial contrast, if the difference between the contrast and the initial contrast is greater than the setting
  • the threshold increases the set value each time based on the initial gate turn-off voltage until the difference between the contrast and the initial contrast is less than the set threshold.
  • FIG. 3a is a structural diagram of a device for adjusting a gate turn-off voltage according to an embodiment of the present disclosure.
  • the pole shutoff voltage adjusting device includes a contrast detecting module 31 and a voltage adjusting module 32.
  • the contrast detecting module 31 is configured to obtain a contrast of display brightness of the display panel by using at least one photosensitive element;
  • the voltage adjustment module 32 is connected to the contrast detection module 31 and is configured to compare the contrast with the initial contrast. If the difference between the contrast and the initial contrast is greater than the set threshold, the gate turn-off voltage of the display panel is adjusted.
  • the contrast detection module 31 obtains the contrast of the display panel display brightness by using at least one photosensitive element, and the voltage adjustment module 32 compares the contrast with the initial contrast of the display panel, if the contrast ratio is The difference between the initial contrast and the initial contrast is greater than the set threshold, and the gate turn-off voltage of the display panel is adjusted.
  • the photosensitive element may be a photoresistor, a photosensitive optical fiber or an optical lens.
  • FIG. 3b is a structural diagram of another apparatus for adjusting a gate turn-off voltage according to an embodiment of the present disclosure.
  • the apparatus may further include a power integrated circuit 33 connected to the voltage adjustment module 32.
  • the initial gate turn-off voltage is generated such that the voltage regulation module 32 performs an adjustment of the gate turn-off voltage based on the initial gate turn-off voltage.
  • the photosensitive elements may be four, respectively disposed on four edges of the rectangular display panel Up, or separately set on the four corners of the rectangular display panel.
  • the contrast detecting module 31 may include a plurality of photosensitive elements 4 disposed at the edge of the display panel;
  • the contrast detection module 31 can also include:
  • the brightness acquiring unit 311 is connected to the plurality of photosensitive elements 3, and is configured to respectively acquire the maximum value and the minimum value of the display brightness of the display panel through the plurality of photosensitive elements 3;
  • the contrast obtaining unit 312 is connected to the brightness acquiring unit 311 and configured to respectively transmit the maximum value and the minimum value of the display brightness to the system main board or the control board, so that the system main board or the control board can display the maximum brightness according to the plurality of sets of brightness.
  • the minimum value is obtained by acquiring a plurality of sets of contrast measurement values, and the plurality of sets of contrast measurement values are averaged to obtain the contrast.
  • the system main board or the control board is a processor of the terminal device, and can receive the maximum value and the minimum value of the display brightness sent by the contrast acquiring unit 312 in the adjusting device of the gate turn-off voltage, and obtain the contrast of the display panel display brightness through a logic operation. The contrast is then transmitted to the contrast acquisition unit 312.
  • the voltage adjustment module 32 is specifically configured to compare the contrast with the initial contrast. If the difference between the contrast and the initial contrast is greater than the set threshold, the gate turn-off voltage of the display panel is at the initial gate turn-off voltage. On the basis of, increase the set value one by one.
  • the gate turn-off voltage adjusting device obtains the contrast of the display panel display brightness through a plurality of photosensitive elements to enhance the accuracy of the measurement result. And measuring the brightness of the display panel display multiple times, compared with the initial contrast, if the difference between the contrast and the initial contrast is greater than the set threshold, the set value is increased every time based on the initial gate turn-off voltage. Until the difference between contrast and initial contrast is less than the set threshold.
  • the scheme is simple in logic, easy to program, and capable of accurately adjusting the gate turn-off voltage.
  • FIG. 4 is provided by an embodiment of the present disclosure.
  • the embodiment of the present disclosure further provides a method for adjusting a display panel, the display panel includes a thin film transistor, a gate of the thin film transistor receives a first voltage signal, and an adjustment method of the display panel includes:
  • the first voltage signal is increased by the first increment.
  • the photosensitive element is a photoresistor, a photosensitive optical fiber or an optical lens.
  • the photosensitive elements are at least four, respectively disposed on four edges of the rectangular display panel, or respectively disposed on the four corners of the rectangular display panel.
  • the second time is after the first time, and the time interval between the second time and the first time is 6 hours.

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Abstract

公开了一种栅极关断电压的调整方法、装置及显示设备。其中，栅极关断电压的调整方法，包括：通过至少一个感光元件获取显示面板显示亮度的对比度S110；将对比度与初始对比度进行比较，若对比度和初始对比度的差值大于设定阈值S120，则对显示面板的栅极关断电压进行调整。

Description

栅极关断电压的调整方法、装置及显示设备 技术领域
本公开实施例涉及显示器驱动技术领域，尤其涉及一种栅极关断电压的调整方法、装置及显示设备。
背景技术
薄膜晶体管液晶显示器(Thin Film Transistor Liquid Crystal Display，TFT-LCD)是当前平板显示的主要品种之一，已经成为了现代IT、视讯产品中重要的显示平台。TFT-LCD主要驱动原理为系统主板将R/G/B压缩信号、控制信号通过线材与控制板(Control Board，C-Board)上的连接器相连接，数据信号和控制信号经过控制板上的时序控制器(Timing Controller，TCON)IC处理后，经柔性扁平电缆(Flexible Flat Cable，FFC)传输至PCB板，再分别通过源极覆晶薄膜(Source-Chip on Film，S-COF)和栅极覆晶薄膜(Gate-Chip on Film，G-COF)与显示区连接，从而使得LCD的显示区的数据线和扫描线分别获得所需的数据信号和栅极驱动信号。
其中，G-COF输出用于开启或关断阵列基板的薄膜晶体管(Thin Film Transistor，TFT)的电压，但是作为像素开关的TFT元件的转移特性会随着时间的推移而改变，即TFT元件的电子迁移率与栅极电压之间的关系会发生改变，则经过一段时间后TFT元件最佳栅极关断电压也会改变，所以经过一段时间后，会造成栅极关断不彻底，导致TFT-LCD的显示区域的像素显示对比度下降。
发明内容
本公开提供一种栅极关断电压的调整方法、装置及显示设备，以解决显示面板随着工作时间的增长，薄膜晶体管栅极关断不彻底而导致显示区域的像素显示对比度下降的问题。
本公开实施例提供了一种栅极关断电压的调整方法，包括：
通过至少一个感光元件获取显示面板显示亮度的对比度；以及
将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。
本公开实施例还提供了一种栅极关断电压的调整装置，包括：
对比度侦测模块，设置为通过至少一个感光元件获取显示面板显示亮度的对比度；以及
电压调整模块，与所述对比度侦测模块相连，设置为将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。
本公开实施例还提供了一种显示设备，包括显示面板，以及本公开任意实施例所述的栅极关断电压的调整装置。
本公开实施例提供的技术方案，通过至少一个感光元件获取显示面板显示亮度的对比度，并将对比度与显示面板的初始对比度进行比较，若对比度和初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。解决了随着工作时间的增长，显示面板的薄膜晶体管栅极关断不彻底而导致显示区域的像素显示对比度下降的问题。
附图说明
图1a是本公开实施例提供的一种栅极关断电压的调整方法的流程图；
图1b是本公开实施例提供的TFT元件的转移特性曲线图；
图2a是本公开实施例提供的另一种栅极关断电压的调整方法的流程图；
图2b是本公开实施例提供的包含显示面板的终端设备的结构图；
图2c是本公开实施例提供的另一包含显示面板的终端设备的结构图；
图3a是本公开实施例提供的一种栅极关断电压的调整装置的结构图；
图3b是本公开实施例提供的另一种栅极关断电压的调整装置的结构图；
图4是本公开实施例提供的一种显示设备的结构图。
具体实施方式
下面结合附图和实施例对本公开作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本公开，而非对本公开的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本公开相关的部分而非全部结构。
图1A是本公开实施例提供的一种栅极关断电压的调整方法的流程图。本实施例的方法可由栅极关断电压的调整装置来执行。如图1A所示，本实施例提供的栅极关断电压的调整方法具体包括步骤S110至步骤S120。
在步骤S110，通过至少一个感光元件获取显示面板显示亮度的对比度。
其中，显示面板可为例如LCD显示面板、OLED显示面板、QLED显示面板或其他显示面板。
薄膜晶体管TFT作为显示面板像素开关，其转移特性会随着工作时间的增加而发生改变，在本实施例中，TFT的转移特性为TFT的电子迁移率随栅极电 压的变化而变化的对应关系，每个栅极电压值都一一对应不同的电子迁移率。但是，随着工作时间的增长，TFT元件在相同栅极电压值下，电子迁移率往往会发生变化。示例性的，显示面板在初始时刻时电子迁移率最小时的栅极电压为V0，则显示面板在工作一段时间之后，栅极电压若还为V0，电子迁移率则不是最小的。
参考图1B，图1B是TFT元件的转移特性曲线图。由图1B可知，在初始时刻，TFT元件的转移特性曲线为曲线1，经过一段时间T后，TFT元件的转移特性曲线为曲线2，TFT元件的转移特性曲线会随着时间的推移而右移。
在TFT元件关断时，电流越小越好，因为若电流较大，则说明TFT元件关断不彻底，导致像素电极仍然被充电，则无法使像素处于暗态。对比度是显示面板的显示亮度的最大值与最小值的比值。TFT元件关断不彻底，则显示面板的显示亮度的最小值会增大，显示面板的对比度则会下降，影响显示面板的显示效果，显示图像不清晰。
参考图1B，则在初始时刻，电流最小时的栅极电压(栅极关断电压)为VGL1，经过时间T之后，电流最小时的栅极电压为VGL2。显示面板的TFT元件的栅极关断电压是出厂时已经设置好的固定值，则随着时间的推移，显示面板的对比度会逐渐下降，影响观看效果，显示面板的使用寿命会减少。
本公开实施例根据TFT的转移特性曲线会随时间而改变的特性，对TFT元件的栅极关断电压进行多次设置。首先，通过至少一个感光元件获取显示面板显示亮度的对比度。感光元件能够测量并获取显示面板显示亮度的最大值和最小值，从而获取显示面板的对比度。
可选的，可设置感光元件在显示面板进行显示的初始时刻，收集显示面板显示亮度的数据。因为在显示面板进行显示的初始时刻，显示设备的系统会切 换最暗和最亮的画面，便于感光元件进行数据的采集，并且在之后显示面板进行显示时，感光元件可以关闭，达到节省电量，节省操作的目的。
可选的，所述感光元件可以为一个，也可以为多个，当感光元件为多个时，可综合各个感光元件的测量结果，获取准确的显示面板显示亮度的对比度。
所述感光元件可以为光敏电阻、光敏光纤或光学镜头。
光敏电阻是利用半导体的光电导效应制成的一种电阻值随入射光的强弱而改变的电阻器，又称为光电导探测器。入射光强，电阻减小，入射光弱，电阻增大；还有另一种光敏电阻入射光弱，电阻减小，入射光强，电阻增大。本实施例根据光敏电阻的阻值与显示面板显示亮度的关系，测得显示面板亮度的最大值和最小值，进而获取显示面板的对比度。
光敏光纤是指对紫外光进行吸收的光纤，通过光纤的紫外吸收谱可观察到。光纤对紫外光的吸收诱导光纤的折射率随着紫外光强的空间分布发生变化，称作光致折射率变化。光敏光纤的纤芯一般为在石英中掺百分之几摩尔的锗或磷，目的是提高折射率。本实施例中可根据光敏光纤折射率的变化而获取显示面板的显示亮度，获取对比度。
光学镜头采用光学成像式结构，模拟人眼的光谱响应和接收特性，连续监测视场角内的亮度，从而获取显示面板的显示亮度的最小值和最大值。
在步骤S120、将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。
通过至少一个感光元件获取显示面板显示亮度的对比度之后，将对比度同初始对比度进行比较，参考图1B，若初始时刻选取的栅极关断电压为最佳值VGL1，则初始时刻有一个最佳的对比度，即本实施例中所述的初始对比度。若测得的对比度和初始对比度的差值大于设定阈值，则对显示面板的栅极关断电 压进行调整，以使对比度和初始对比度相等，或者比较接近初始对比度。示例性的，参考图1B，初始栅极关断电压为VGL1，经过时间T之后，若栅极关断电压若还为VGL1，显示面板显示亮度的对比度减小，可以通过设置栅极关断电压为VGL2，使得显示面板显示亮度的对比度和初始对比度相等。
值得注意的是，设定阈值的取值尽可能的小。可选的，可设置为初始对比度的百分之五，以使栅极关断电压能够得到及时的调整。
在上述实施例的基础上，在调节栅极关断电压时，可根据电子迁移率和栅极关断电压的关系，以及电子迁移率和显示亮度的对比度之间的关系，直接获取测量时刻，对比度为初始对比度的栅极关断电压值，然后将栅极驱动短路的栅极关断电压设置为此时计算得到的栅极关断电压值。
或者，根据电子迁移率和对比度的关系，直接设置各个档位的栅极关断电压值。示例性的，可设置在显示面板工作T时间后，将栅极关断电压值设置为一档，在显示面板工作2T时间后，将栅极关断电压值设置为二档，具体档位的栅极关断电压值，根据TFT元件的转移特性随时间推移的特性而定。
本公开实施例提供的技术方案，通过至少一个感光元件获取显示面板显示亮度的对比度，并将对比度与显示面板的初始对比度进行比较，若对比度和初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。解决了随着工作时间的推移，显示面板的TFT元件栅极关断不彻底而导致显示区域的像素显示对比度下降的问题。
参考图2A，图2A是本公开实施例提供的另一种栅极关断电压的调整方法的流程图。该栅极关断电压的调整方法中应用了多个感光元件，具体的，该栅极关断电压的调整方法包括步骤S210至
在步骤S210、通过设置在显示面板边缘的多个感光元件分别获取所述显示 面板显示亮度的最大值和最小值。
设置多个感光元件，每个感光元件分别测量显示面板显示亮度的最大值和最小值，可综合各个感光元件测量的显示亮度的数据，获取准确的对比度值。
可选的，所述感光元件为四个，参考图2B，图2B是本公开实施例提供的包含显示面板的终端设备的结构图。感光元件3分别设置在矩形显示面板2的四个边缘上，或者参考图2C，图2C是本公开实施例提供的另一包含显示面板的终端设备的结构图，感光元件3分别设置在矩形显示面板2的四个角上，或者感光元件3还可以任意设置在显示面板2的边缘，又或者显示面板2为其他的形状，感光元件3可以以规则或不规则的顺序设置在显示面板2的边缘。
在步骤S220、将所述显示亮度的最大值和最小值分别传输至系统主板或者控制板，以使系统主板或者控制板根据多组所述显示亮度的最大值和最小值，获取多组对比度测量值，并将所述多组对比度测量值取均值获取所述对比度。
各个感光元件可将测得的显示亮度的最大值和最小值分别输出至系统主板或者控制板，系统主板或控制板根据多组显示亮度的最大值和最小值，进行对比度的计算。系统主板或者控制板通过N组感光元件的显示亮度的最大值和最小值，获取N个显示亮度的对比度测量值，再将N个对比度测量值取均值获取对比度，示例性的，有两个感光元件M1和M2，感光元件M1测得的显示亮度的最大值和最小值分别为H1和L1，系统主板或控制板通过公式H1/L1，获取对比度测量值D1；感光元件M2测得的显示亮度的最大值和最小值分别为H2和L2，系统主板或控制板通过公式H2/L2，获取对比度测量值D2。系统主板或控制板再通过公式(D1+D2)/2，计算得到对比值D。
或者，也可以通过其中一个感光元件测得的数据直接得到对比度，再通过其他感光元件测得的数据进行验证。示例性的，系统主板或控制板通过感光元 件M1测得的数据得到了对比度D，再通过感光元件M2测得对比度D1，若对比度D1和对比度D之间的差值大于设定范围，则重新控制感光元件进行显示亮度的测量。
另外，也可以首先获取多个感光元件测量得到的显示亮度的最大值，并获取其均值，同理，获取多个感光元件测量得到的显示亮度的最小值，并获取其均值，由最大值的均值和最小值的均值，得到显示亮度的对比度。示例性的，有两个感光元件M1和M2，分别获取其测得的显示亮度的最大值H1和H2，通过公式(H1+H2)/2获取显示亮度的最大值的均值H，同理，获取显示亮度的最小值的均值L，根据公式H/L获取对比度。
在步骤S230、将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则显示面板的栅极关断电压在初始栅极关断电压的基础上，逐次增加设定数值。
可以在测得的对比度和初始对比度的差值大于设定阈值时，设置设定数值作为每次增加栅极关断电压的增量，其中设定数值可为固定值。设定数值可尽可能的小，以保证不错过调整栅极关断电压至使对比度为初始对比度的状态。当检测到当前对比度和初始对比度的差值大于设定阈值时，在初始栅极关断电压的基础上增加设定数值，然后再次检测当前对比度，并判断当前对比度和初始对比度差值是否大于设定阈值，若大于设定阈值，则在上次栅极关断电压的基础上增加设定数值，即逐次增加设定数值，直至当前对比度和初始对比度的差值小于设定阈值。
本方案中栅极关断电压的调整方法，通过多个感光元件获取显示面板显示亮度的对比度，以增强测量结果的准确性。并且多次测量显示面板显示亮度的对比度，与初始对比度进行比较，若每次对比度和初始对比度的差值大于设定 阈值，则在初始栅极关断电压的基础上每次都增加设定数值，直至对比度和初始对比度的差值小于设定阈值。本方案逻辑简单，易于编程实现，且能够对栅极关断电压进行准确的调节。
本公开实施例还提供一种栅极关断电压的调整装置，参考图3a，图3a是本公开实施例提供的一种栅极关断电压的调整装置的结构图，本实施例提供的栅极关断电压的调整装置包括：对比度侦测模块31和电压调整模块32。
其中，对比度侦测模块31，设置为通过至少一个感光元件获取显示面板显示亮度的对比度；
电压调整模块32，与对比度侦测模块31相连，设置为将对比度与初始对比度进行比较，若对比度和初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。
本公开实施例提供的栅极关断电压的调整装置，对比度侦测模块31通过至少一个感光元件获取显示面板显示亮度的对比度，电压调整模块32将对比度与显示面板的初始对比度进行比较，若对比度和初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。解决了随着工作时间的推移，显示面板的TFT元件栅极关断不彻底而导致显示区域的像素显示对比度下降的问题。
在上述实施例的基础上，可选的，所述感光元件可以为光敏电阻、光敏光纤或光学镜头。
可选的，参考图3b，图3b是本公开实施例提供的另一种栅极关断电压的调整装置的结构图，所述装置还可以包括功率集成电路33，与电压调整模块32相连，用于产生初始栅极关断电压，使得电压调节模块32在初始栅极关断电压的基础上进行栅极关断电压的调整。
可选的，所述感光元件可以为四个，分别设置在矩形显示面板的四个边缘 上，或者分别设置在矩形显示面板的四个角上。
可选的，对比度侦测模块31可以包括多个设置在显示面板边缘的感光元件4；
对比度侦测模块31还可以包括：
亮度获取单元311，与多个感光元件3相连，设置为通过多个感光元件3分别获取显示面板显示亮度的最大值和最小值；
对比度获取单元312，与亮度获取单元311相连，设置为将显示亮度的最大值和最小值分别传输至系统主板或者控制板，以使系统主板或者控制板根据多组所述显示亮度的最大值和最小值，获取多组对比度测量值，并将所述多组对比度测量值取均值获取所述对比度。
系统主板或控制板为终端设备的处理器，可接收栅极关断电压的调整装置中的对比度获取单元312输送的显示亮度的最大值和最小值，并通过逻辑运算获取显示面板显示亮度的对比度，再将对比度传输至对比度获取单元312。
可选的，电压调节模块32具体可设置为：将对比度与初始对比度进行比较，若对比度和初始对比度的差值大于设定阈值，则显示面板的栅极关断电压在初始栅极关断电压的基础上，逐次增加设定数值。
本方案中栅极关断电压的调整装置，通过多个感光元件获取显示面板显示亮度的对比度，以增强测量结果的准确性。并且多次测量显示面板显示亮度的对比度，与初始对比度进行比较，若每次对比度和初始对比度的差值大于设定阈值，则在初始栅极关断电压的基础上每次都增加设定数值，直至对比度和初始对比度的差值小于设定阈值。本方案逻辑简单，易于编程实现，且能够对栅极关断电压进行准确的调节。
本公开实施例还提供一种显示设备，参考图4，图4是本公开实施例提供的 一种显示设备的结构图，显示设备1包括显示面板2，以及本公开任意实施例所述的栅极关断电压的调整装置4。
本公开实施例还提供一种显示面板的调整方法，所述显示面板包括薄膜晶体管，所述薄膜晶体管的栅极接收第一电压信号，所述显示面板的调整方法包括：
通过感光元件在第一时刻获取显示面板的最大亮度值和最小亮度值，并根据第一时刻的最大亮度值和最小亮度值计算第一时刻的对比度；
通过感光元件在第二时刻获取显示面板的最大亮度值和最小亮度值，并根据第二时刻的最大亮度值和最小亮度值计算第二时刻的对比度；
计算第二时刻的对比度和第一时刻对比度的差值；
根据所述第二时刻的对比度和第一时刻对比度的差值计算第一增量；以及
将所述第一电压信号增加所述第一增量。
可选地，所述感光元件为光敏电阻、光敏光纤或光学镜头。
可选地，感光元件为至少四个，分别设置在矩形显示面板的四个边缘上，或者分别设置在矩形显示面板的四个角上。
可选地，所述第二时刻在第一时刻之后，所述第二时刻和第一时刻的时间间隔为6小时。
注意，上述仅为本公开的较佳实施例及所运用技术原理。本领域技术人员会理解，本公开不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本公开的保护范围。因此，虽然通过以上实施例对本公开进行了较为详细的说明，但是本公开不仅仅限于以上实施例，在不脱离本公开构思的情况下，还可以包括更多其他等效实施例，而本公开的范围由所附的权利要求范围决定。

Claims (20)

  1. 一种栅极关断电压的调整方法，包括：
    通过至少一个感光元件获取显示面板显示亮度的对比度；以及
    将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。
  2. 根据权利要求1所述的方法，其中，所述感光元件为多个；
    所述通过至少一个感光元件获取显示面板显示亮度的对比度，包括：
    通过设置在显示面板边缘的多个感光元件分别获取所述显示面板显示亮度的最大值和最小值；
    将所述显示亮度的最大值和最小值分别传输至系统主板或者控制板，以使系统主板或者控制板根据多组所述显示亮度的最大值和最小值，获取多组对比度测量值，并将所述多组对比度测量值取均值获取所述对比度。
  3. 根据权利要求2所述的方法，其中，所述感光元件为至少四个，分别设置在矩形显示面板的四个边缘上，或者分别设置在矩形显示面板的四个角上。
  4. 根据权利要求1所述的方法，其中，将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整，包括：
    将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则将显示面板的栅极关断电压在初始栅极关断电压的基础上，逐次增加设定数值。
  5. 一种栅极关断电压的调整装置，包括：
    对比度侦测模块，设置为通过至少一个感光元件获取显示面板显示亮度的对比度；
    电压调整模块，与所述对比度侦测模块相连，设置为将所述对比度与初始 对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则对显示面板的栅极关断电压进行调整。
  6. 根据权利要求5所述的装置，其中，所述感光元件为光敏电阻。
  7. 根据权利要求5所述的装置，还包括：
    功率集成电路，与所述电压调整模块相连，设置为产生初始栅极关断电压，使得所述电压调节模块在所述初始栅极关断电压的基础上进行栅极关断电压的调整。
  8. 根据权利要求5所述的装置，其中，所述感光元件为四个，分别设置在矩形显示面板的四个边缘上，或者分别设置在矩形显示面板的四个角上。
  9. 根据权利要求5所述的装置，其中，所述对比度侦测模块包括多个设置在显示面板边缘的感光元件；
    所述对比度侦测模块，还包括：
    亮度获取单元，与多个所述感光元件相连，设置为通过多个所述感光元件分别获取所述显示面板显示亮度的最大值和最小值；
    对比度获取单元，与所述亮度获取单元相连，用于将所述显示亮度的最大值和最小值分别传输至系统主板或者控制板，以使系统主板或者控制板根据多组所述显示亮度的最大值和最小值，获取多组对比度测量值，并将所述多组对比度测量值取均值获取所述对比度。
  10. 根据权利要求5所述的装置，其中，所述电压调整模块设置为将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则将显示面板的栅极关断电压在初始栅极关断电压的基础上，逐次增加设定数值。
  11. 一种显示设备，包括显示面板，以及如上述权利要求5所述的栅极关 断电压的调整装置。
  12. 如权利要求11所述的显示设备，其中，所述感光元件为光敏电阻、光敏光纤或光学镜头。
  13. 如权利要求11所述的显示设备，其中，所述栅极关断电压的调整装置还包括：功率集成电路，与所述电压调整模块相连，设置为产生初始栅极关断电压，使得所述电压调节模块在所述初始栅极关断电压的基础上进行栅极关断电压的调整。
  14. 如权利要求11所述的显示设备，其中，所述感光元件为四个，分别设置在矩形显示面板的四个边缘上，或者分别设置在矩形显示面板的四个角上。
  15. 如权利要求11所述的显示设备，其中，所述对比度侦测模块包括多个设置在显示面板边缘的感光元件；所述对比度侦测模块，还包括：
    亮度获取单元，与多个所述感光元件相连，设置为通过多个所述感光元件分别获取所述显示面板显示亮度的最大值和最小值；
    对比度获取单元，与所述亮度获取单元相连，用于将所述显示亮度的最大值和最小值分别传输至系统主板或者控制板，以使系统主板或者控制板根据多组所述显示亮度的最大值和最小值，获取多组对比度测量值，并将所述多组对比度测量值取均值获取所述对比度。
  16. 如权利要求11所述的显示设备，其中，所述电压调整模块设置为将所述对比度与初始对比度进行比较，若所述对比度和所述初始对比度的差值大于设定阈值，则将显示面板的栅极关断电压在初始栅极关断电压的基础上，逐次增加设定数值。
  17. 一种显示面板的调整方法，所述显示面板包括薄膜晶体管，所述薄膜晶体管的栅极接收第一电压信号，所述显示面板的调整方法包括：
    通过感光元件在第一时刻获取显示面板的最大亮度值和最小亮度值，并根据第一时刻的最大亮度值和最小亮度值计算第一时刻的对比度；
    通过感光元件在第二时刻获取显示面板的最大亮度值和最小亮度值，并根据第二时刻的最大亮度值和最小亮度值计算第二时刻的对比度；
    计算第二时刻的对比度和第一时刻对比度的差值；
    根据所述第二时刻的对比度和第一时刻对比度的差值计算第一增量；以及
    将所述第一电压信号增加所述第一增量。
  18. 根据权利要求17所述的显示面板的调整方法，其中，所述感光元件为光敏电阻、光敏光纤或光学镜头。
  19. 根据权利要求17所述的显示面板的调整方法，其中，感光元件为至少四个，分别设置在矩形显示面板的四个边缘上，或者分别设置在矩形显示面板的四个角上。
  20. 根据权利要求17所述的显示面板的调整方法，其中，所述第二时刻在第一时刻之后，所述第二时刻和第一时刻的时间间隔为6小时。
PCT/CN2017/088739 2017-05-05 2017-06-16 栅极关断电压的调整方法、装置及显示设备 Ceased WO2018201569A1 (zh)

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