WO2020133634A1 - 过流保护方法、过流保护电路和显示装置 - Google Patents

过流保护方法、过流保护电路和显示装置 Download PDF

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WO2020133634A1
WO2020133634A1 PCT/CN2019/073637 CN2019073637W WO2020133634A1 WO 2020133634 A1 WO2020133634 A1 WO 2020133634A1 CN 2019073637 W CN2019073637 W CN 2019073637W WO 2020133634 A1 WO2020133634 A1 WO 2020133634A1
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overcurrent protection
current
circuit
real
level shift
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English (en)
French (fr)
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曾德康
胡水秀
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HKC Co Ltd
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HKC Co Ltd
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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
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/008—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for protective arrangements according to this subclass
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0289—Details of voltage level shifters arranged for use in a driving circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/025—Reduction of instantaneous peaks of current
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

Definitions

  • the present application relates to the field of display technology, in particular to an overcurrent protection method, overcurrent protection circuit and display device.
  • liquid crystal displays which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to place liquid crystal molecules in two parallel glass substrates, and apply a driving voltage on the two glass substrates to control the rotation direction of the liquid crystal molecules, so as to refract the light of the backlight module to generate a picture.
  • thin film transistor liquid crystal displays due to their low power consumption, excellent picture quality, and high production yield, have gradually occupied a dominant position in the display field.
  • a thin film transistor liquid crystal display includes a liquid crystal panel and a backlight module.
  • the liquid crystal panel includes a color filter substrate, a thin film transistor array substrate, and a transparent electrode exists on the opposite inner side of the substrate. A layer of liquid crystal molecules is sandwiched between the two substrates.
  • the circuit of the display panel may be provided with an overcurrent protection circuit.
  • the overcurrent protection circuit disconnects the power supply of the display panel to protect the display panel.
  • the overcurrent protection circuit disconnects the power supply of the display panel to protect the display panel.
  • the present application provides an over-current protection method, an over-current protection circuit, and a display device, so that each circuit in the display panel is over-current protected in advance to avoid the occurrence of a short circuit.
  • an overcurrent protection method which includes the steps of:
  • the step of outputting the corresponding overcurrent protection value to the level shift circuit according to the real-time current includes:
  • the corresponding overcurrent protection value is found from the overcurrent protection value look-up table and output to the level shift circuit;
  • the over-current protection value look-up table is stored in the power supply circuit, and the over-current protection value look-up table includes at least two sets of corresponding data of the current slope value of the current slope waveform and the over-current protection threshold.
  • the over-current protection value of the over-current protection value look-up table corresponds to the peak value of the real-time current slope waveform.
  • the over-current protection value of the over-current protection value look-up table corresponds to the slope value of the real-time current slope waveform.
  • the real-time current is compared with the over-current protection threshold.
  • the power supply of the current clock signal branch of the first substrate row drive circuit is turned off to initiate over-current protection.
  • the steps include:
  • the current slope value of the slope waveform of the real-time current is compared with the overcurrent protection threshold, and when the real-time current slope value is greater than or equal to the corresponding overcurrent protection threshold, the first substrate is turned off.
  • the step of enabling the over-current protection threshold and controlling to close the level shift circuit includes:
  • the method further includes the steps of:
  • the level shift circuit When it is detected that the level shift circuit restarts, the real-time current of the current clock signal branch of the first substrate row drive circuit is re-detected.
  • the method when it is detected that the level shift circuit is restarted, after re-detecting the real-time current of the current clock signal branch of the row drive circuit of the first substrate, the method further includes the steps of:
  • the corresponding overcurrent protection value is output to the level shift circuit.
  • the method further includes the steps of:
  • the level shift circuit sets the overcurrent protection value to the overcurrent protection threshold of the current clock signal branch.
  • the method further includes the following steps:
  • the step of controlling to turn off the level shift circuit again includes:
  • the level shift circuit is completely shut down and cannot be restarted.
  • This application also discloses an overcurrent protection method, including:
  • the detection circuit detects the real-time current slope waveform of the current clock signal branch of the first substrate row drive circuit
  • the overcurrent protection judgment circuit also compares and judges according to the current slope value of the real-time current slope waveform and the overcurrent protection value lookup table, and outputs the corresponding overcurrent protection value to the level shift circuit;
  • the level shift circuit sets the over-current protection value to the over-current protection threshold of the current clock signal branch
  • Over-current protection judgment circuit enable over-current protection threshold, control to close the level shift circuit
  • the overcurrent protection judgment circuit compares the current slope value of the real-time current slope waveform with the overcurrent protection threshold, and when the real-time current slope value is greater than or equal to the corresponding overcurrent protection threshold, Turn off the power of the current clock signal branch of the first substrate row drive circuit and start the circuit protection.
  • the present application also discloses a display device including a display panel.
  • the display panel includes an overcurrent protection circuit.
  • the overcurrent protection circuit includes:
  • the detection circuit detects the real-time current slope waveform of the current clock signal branch of the first substrate row drive circuit
  • the overcurrent protection judgment circuit compares and judges based on the current slope value of the real-time current slope waveform and the overcurrent protection value lookup table, and outputs the corresponding overcurrent protection value to the level shift circuit;
  • the level shift circuit sets the overcurrent protection value to the overcurrent protection threshold of the current clock signal branch
  • the overcurrent protection judgment circuit also enables the overcurrent protection threshold and controls to close the level shift circuit
  • the overcurrent protection judgment circuit compares the current slope value of the real-time current slope waveform with the overcurrent protection threshold, and when the real-time current slope value is greater than or equal to the corresponding overcurrent protection threshold, Turn off the power of the current clock signal branch of the first substrate row drive circuit and start the circuit protection.
  • the display panel is one of a twisted nematic display panel, a plane conversion display panel, and a multi-quadrant vertical alignment display panel.
  • This application can detect the real-time current of at least one clock signal branch of the first substrate row drive circuit according to the load difference of the circuits in different display panels, and set the corresponding for the first substrate row drive circuit clock signal branch according to the actual current
  • the over-current protection threshold is used for over-current protection. In this way, since the real-time current and the load corresponding to the display panel are the same, the over-current protection threshold corresponding to the display panel with different loads is different, so it can be based on different display panels.
  • the actual current of the actual load of the load is set to different overcurrent protection thresholds to avoid the overcurrent protection threshold of the display panel of different loads being too high or too low, to avoid the overcurrent protection threshold being too low, and the display panel has repeatedly departed In the case of overcurrent protection, it also avoids the situation that the overcurrent protection threshold is too high, the display panel is short-circuited or even burned, and the overcurrent protection is still not enabled.
  • FIG. 1 is a schematic diagram of differences in voltage and current changes of a clock signal branch according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of the difference in voltage and current changes of the clock signal branch according to the embodiment of the present application;
  • FIG. 3 is a schematic diagram of a flow of an overcurrent protection method according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an overcurrent protection circuit according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a display device according to an embodiment of the present application.
  • the features defined as “first” and “second” may explicitly or implicitly include one or more of the features.
  • the meaning of “plurality” is two or more.
  • the term “including” and any variations thereof are intended to cover non-exclusive inclusions.
  • an embodiment of the present application discloses an overcurrent protection method and an overcurrent protection circuit.
  • Fig. 1 and Fig. 2 are schematic diagrams of the difference between the voltage and current of the clock signal branch, where Fig. 1 shows the effect of the difference in load of different clock signal branches on the current and voltage changes; Fig. 2 shows the current of the signal branch at time t The difference with the voltage change.
  • 3 is a flowchart of an overcurrent method of the present application, and an overcurrent protection method, including steps:
  • S11 Output the corresponding overcurrent protection value to the level shift circuit according to the real-time current
  • S15 Compare the real-time current with the overcurrent protection threshold. When the real-time current is greater than or equal to the overcurrent protection threshold, turn off the power of the current clock signal branch of the first substrate row drive circuit to start overcurrent protection.
  • over-current protection is to calculate a suitable over-current protection value, set a fixed over-current protection current value for each display panel as a reference point for protection, and perform over-current protection.
  • a uniform overcurrent protection threshold is set for each circuit in the display panel, this may not Branches with low over-current protection thresholds will be over-current protected in advance.
  • heat will accumulate at these short-circuits, which in turn will cause the display panel to burn out.
  • This application can detect the real-time current of at least one clock signal branch of the first substrate row drive circuit according to the load difference of the circuits in different display panels, and set the corresponding for the first substrate row drive circuit clock signal branch according to the actual current
  • the over-current protection threshold value is used for over-current protection.
  • the actual current condition of the actual load of the load is set to different overcurrent protection thresholds, to avoid the situation that the overcurrent protection threshold of the display panel of different loads is too high or too low, to avoid the occurrence of the overcurrent protection threshold is too low, the display panel has repeatedly departed In the case of overcurrent protection, it also avoids the situation that the overcurrent protection threshold is too high, the display panel is short-circuited or even burned, and the overcurrent protection is still not enabled.
  • the first substrate is generally an array substrate, and other substrates applicable to this solution can also be used.
  • the step of outputting the corresponding overcurrent protection value to the level shift circuit according to the real-time current includes:
  • the corresponding overcurrent protection value is found from the overcurrent protection value look-up table and output to the level shift circuit;
  • the over-current protection value look-up table is stored in the power supply circuit, and the over-current protection value look-up table includes at least two sets of corresponding data of the current slope value of the current slope waveform and the over-current protection threshold.
  • the over-current protection value look-up table can be obtained based on the statistics of experimental data, or it can be calculated by the formula to indicate the corresponding data of a variety of current slope waveforms and over-current protection thresholds under normal operation;
  • the overcurrent protection value that is more in line with the first substrate row drive circuit can be set, so that the first substrate row drive circuit is better protected, avoiding the overcurrent protection threshold and the actual circuit There is too much deviation in the situation, so as to ensure the display quality of the display panel within the threshold, and avoid the situation that the current value exceeds the actual overcurrent value and the circuit protection is not performed.
  • Is1 represents the first current slope value
  • OCP1 represents the first overcurrent protection value
  • Is2 represents the second current slope value
  • OCP2 represents the second overcurrent protection value
  • IsN represents the Nth current slope value
  • OCPN represents the second overcurrent protection value
  • N is a natural number greater than or equal to 1.
  • the over-current protection value of the over-current protection value look-up table corresponds to the peak value of the real-time current slope waveform.
  • the current of the first substrate row drive circuit fluctuates under normal operation.
  • the peak value of the real-time current slope waveform can best reflect the current fluctuation of the first substrate row drive circuit under normal operation.
  • the peak value of the real-time current slope waveform is used as The reference of the preset over-current protection threshold can ensure that the over-current protection threshold is greater than the peak value but does not exceed too much. In this way, the circuit can be prevented from being caused by a low or high peak value due to special reasons. In the case of non-correspondence, it is ensured that the first substrate row drive circuit can obtain correct overcurrent protection.
  • the over-current protection value of the over-current protection value look-up table corresponds to the slope value of the real-time current slope waveform.
  • the current slope value of the real-time current slope waveform actually contains data such as peak value, current duration, and current change.
  • the overcurrent protection threshold corresponding to the current slope value of the real-time current slope waveform refers to the most comprehensive Data to ensure that the overcurrent protection threshold can be applied in most cases to ensure the display stability of the display panel.
  • the step of enabling the over-current protection threshold and controlling to close the level shift circuit includes:
  • the first substrate row drive circuit can select one clock signal branch from it for testing, or can select multiple clock signal branches from it for testing and take the average value, then set the corresponding overcurrent protection threshold to all clock signal branches .
  • the first substrate row driving circuit can also traverse each clock signal branch, and set an overcurrent protection threshold for each clock signal branch separately to cope with the load difference of different branches caused by the manufacturing process, for example, The length of the clock signal branch of the first substrate row drive circuit produced is different, resulting in different resistances, which causes load differences.
  • the first substrate row drive circuit branch makes an erroneous judgment on the sudden change of current or voltage, which leads to the setting Incorrect over-current protection threshold; in addition, after completing the over-current protection threshold setting, turn off the level shift circuit to avoid setting a short-circuit current exceeding the short-circuit current due to the detection of a short-circuit current in the clock signal branch and causing the display
  • the long-term face of the panel affects the display effect and even damages the display panel due to short-circuit current.
  • the step of controlling the level-shift circuit to be turned off again includes:
  • the line conditions of each row of driving circuits may be worn out due to long-term use or the load condition of the row driving circuit caused by replacement and repair is different from the initial load condition; the level shift circuit can be turned on again , And re-test to reset the new over-current protection threshold, the over-current protection threshold may change with the current or voltage of the line drive circuit, which is different from the original over-current protection threshold set at the factory, according to the actual line The situation is updated in a timely manner to continuously and dynamically give the first substrate row drive circuit overcurrent protection.
  • the level shift circuit is completely shut down and cannot be restarted.
  • the level shift circuit is completely shut down and cannot be restarted, which ensures that the level shift circuit will not be erroneously started, avoiding the occurrence of detecting an overcurrent current and setting an excessive overcurrent protection threshold, which makes the first substrate row drive circuit To the correct overcurrent protection, to ensure the normal operation of the display panel, to avoid damage and burnout of the display panel.
  • an overcurrent protection circuit 1 includes: a detection circuit 11 that detects the real-time current slope of the current clock signal branch of the first substrate row drive circuit Waveform; overcurrent protection judgment circuit 21, based on real-time current slope waveform current slope value and overcurrent protection value look-up table for comparison and judgment, output the corresponding overcurrent protection value to the level shift circuit; level shift circuit 40, will over The current protection value is set to the overcurrent protection threshold of the current clock signal branch; the overcurrent protection judgment circuit also enables the overcurrent protection threshold and controls to close the level shift circuit; when the level shift circuit 40 is closed, the The overcurrent protection judgment circuit 21 compares the current slope value of the real-time current slope waveform with the overcurrent protection threshold. When the real-time current slope value is greater than or equal to the corresponding overcurrent protection threshold, the current clock signal of the first substrate row drive circuit is turned off Protection of power supply and starting circuit of branch circuit.
  • a corresponding overcurrent protection threshold is set for the branch of the current clock signal, when the row drive circuit real-time current threshold is greater than the overcurrent protection threshold At this time, the power of the current clock signal branch of the first substrate row drive circuit is turned off, and the circuit protection is started.
  • different overcurrent protection settings are made for different clock signal branches, to avoid using a fixed overcurrent protection threshold for multiple clock signal branches, causing the clock signal branch with a low overcurrent protection threshold to be burned and not yet available Overcurrent protection occurs.
  • the over-current protection look-up table can refer to Table 1 above.
  • FIG. 5 is a schematic diagram of a display device of the present application.
  • a display device 80 is disclosed.
  • the display device includes a display panel 60, and the display panel 60 includes the overcurrent protection circuit 1 described above.
  • the display device can set the corresponding overcurrent protection threshold according to the situation of the display panel 60's own driving circuit load, so that different overcurrent protection thresholds can be set for different panels to avoid different display panels 60 Using the same over-current protection threshold results in a situation where a panel with a low over-current protection threshold has been burned and over-current protection cannot be obtained.
  • TN panel full name Twisted Nematic, namely twisted nematic panel
  • IPS panel In-Plane Switching, plane switching
  • VA panel Multi-Domain Vertical Alignment, multi-quadrant vertical alignment technology

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Abstract

一种过流保护方法、过流保护电路和显示装置，其中过流保护方法包括：将过流保护值设置为当前时钟信号支路的过流保护阈值（S12）；启用过流保护阈值，控制关闭电平转移电路（S13）；检测第一基板行驱动电路当前时钟信号支路的实时电流（S14）；将实时电流跟过流保护阈值进行对比，当实时电流大于或等于过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源，启动过流保护（S15）。该过流保护方法可以使得显示面板内的各路电路提前得到过流保护，避免出现短路的情况。

Description

过流保护方法、过流保护电路和显示装置
本申请要求于2018年12月27日提交中国专利局，申请号为CN201811607036.0，申请名称为“一种过流保护方法、过流保护电路和显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示技术领域，尤其涉及一种过流保护方法、过流保护电路和显示装置。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
随着科技的发展和进步，液晶显示器由于具备机身薄、省电和辐射低等热点而成为显示器的主流产品，得到了广泛应用。市场上的液晶显示器大部分为背光型液晶显示器，其包括液晶面板及背光模组。液晶面板的工作原理是在两片平行的玻璃基板当中放置液晶分子，并在两片玻璃基板上施加驱动电压来控制液晶分子的旋转方向，以将背光模组的光线折射出来产生画面。其中，薄膜晶体管液晶显示器，由于具有低的功耗、优异的画面品质以及较高的生产良率等性能，目前已经逐渐占据了显示领域的主导地位。同样，薄膜晶体管液晶显示器包含液晶面板和背光模组，液晶面板包括彩膜基板，薄膜晶体管阵列基板，上述基板的相对内侧存在透明电极。两片基板之间夹一层液晶分子。
为了避免显示面板的电路发生短路带来危险，显示面板的电路可设置过流保护电路，在显示面板的电路发生短路时，过流保护电路断开显示面板的供电，以保护显示面板。但对于显示面板而言，因制程原因，不同的显示面板存在个体差异，显示面板内的各支路的负载不尽相同；若对显示面板内的各路电路统一设置一个过流保护阈值，这样可能无法对显示面板内某些过流保护阈值低的支路提前做过流保护，当某些过流保护阈值低的电路发生短路时，这些短路处会积累热量，进而导致显示面板烧毁。
发明内容
本申请提供一种过流保护方法、过流保护电路和显示装置，以使得显示面板内的各路电路提前得到过流保护,避免出现短路的情况。
为实现上述目的，本申请提供了一种过流保护方法，包括步骤：
根据实时电流输出对应的过流保护值到电平转移电路；
将过流保护值设置为当前时钟信号支路的过流保护阈值；
启用过流保护阈值，控制关闭电平转移电路；
检测第一基板行驱动电路当前时钟信号支路的实时电流；以及
将实时电流跟过流保护阈值进行对比，当实时电流大于或等于过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源，启动过流保护。
可选的，所述根据实时电流输出对应的过流保护值到电平转移电路的步骤包括：
根据实时电流的电流斜率波形，从过流保护值查找表中查找到对应的过流保护值，并输出到电平转移电路；
所述过流保护值查找表存储在电源电路中，所述过流保护值查找表至少包括两组所述电流斜率波形的电流斜率值和所述过流保护阈值的对应数据。
可选的，所述过流保护值查找表的过流保护值是与实时电流斜率波形的峰值对应的。
可选的,所述过流保护值查找表的过流保护值是与实时电流斜率波形的斜率值对应的。
可选的，所述将实时电流跟过流保护阈值进行对比，当实时电流大于或等于过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源，启动过流保护的步骤包括：
当所述电平转移电路关闭时，将实时电流的斜率波形的电流斜率值，跟过流保护阈值进行对比，当实时电流斜率值大于或等于对应的过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源、启动电路保护。
可选的，所述启用过流保护阈值，控制关闭电平转移电路的步骤包括：
判断是否第一基板行驱动电路的所有时钟信号支路均已完成了过流保护阈值设置，若是，则控制关闭电平转移电路。
可选的，若第一基板行驱动电路的所有时钟信号支路均为完成了过流保护阈值设置，则继续进行过流保护阈值设置的操作。
若否，则继续进行过流保护阈值设置的操作。
可选的，所述启用过流保护阈值，控制关闭电平转移电路的步骤之后还包括步骤：
当检测到所述电平转移电路重新启动时，重新检测第一基板行驱动电路的当前时钟信号支路的实时电流。
可选的，当检测到所述电平转移电路重新启动时，重新检测第一基板行驱动电路的当前时钟信号支路的实时电流后，还包括步骤：
根据检测得到的实时电流，输出对应的过流保护值到电平转移电路。
可选的，根据检测得到的实时电流，输出对应的过流保护值到电平转移电路后，还包括 步骤：
电平转移电路将过流保护值设置为当前时钟信号支路的过流保护阈值。
可选的，电平转移电路将过流保护值设置为当前时钟信号支路的过流保护阈值后，还包括步骤：
再次控制关闭电平转移电路。
可选的，所述再次控制关闭电平转移电路的步骤包括：
判断是否第一基板行驱动电路的所有时钟信号支路均已完成了过流保护阈值设置，若是，则再次控制关闭电平转移电路。
可选的，判断第一基板行驱动电路的所有时钟信号支路均为完成了过流保护阈值设置，则继续进行过流保护阈值设置的操作。
可选的，所述启用过流保护阈值，关闭电平转移电路的步骤中：
所述电平转移电路被彻底关闭，无法重启。
本申请还公开一种过流保护方法，包括：
侦测电路,检测第一基板行驱动电路当前时钟信号支路的实时电流斜率波形；
所述过流保护判断电路还根据实时电流斜率波形的电流斜率值和过流保护值查找表进行对比判断，输出对应的过流保护值到电平转移电路；
电平转移电路，将过流保护值设置为当前时钟信号支路的过流保护阈值；以及
过流保护判断电路，启用过流保护阈值，控制关闭电平转移电路；
当所述电平转移电路关闭时，所述过流保护判断电路将实时电流斜率波形的电流斜率值跟过流保护阈值进行对比，当实时电流斜率值大于或等于对应的过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源、启动电路保护。
本申请还公开了一种显示装置，包括显示面板，所述显示面板包括过流保护电路，所述过流保护电路包括:
侦测电路,检测第一基板行驱动电路当前时钟信号支路的实时电流斜率波形；
过流保护判断电路，根据实时电流斜率波形的电流斜率值和过流保护值查找表进行对比判断，输出对应的过流保护值到电平转移电路；以及
电平转移电路，将过流保护值设置为当前时钟信号支路的过流保护阈值；
其中，所述过流保护判断电路还启用过流保护阈值，控制关闭电平转移电路；
当所述电平转移电路关闭时，所述过流保护判断电路将实时电流斜率波形的电流斜率值跟过流保护阈值进行对比，当实时电流斜率值大于或等于对应的过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源、启动电路保护。
可选的，所述显示面板为扭曲向列型显示面板、平面转换显示面板和多象限垂直配向显示面板中的一种。
本申请可以根据不同的显示面板内电路的负载差异，检测第一基板行驱动电路至少一条时钟信号支路的实时电流，依据实际电流的情况，为第一基板行驱动电路时钟信号支路设置对应的过流保护阈值进行过流保护，如此，由于实时电流和显示面板对应的负载是一致的，所以，不同负载的显示面板对应的过流保护的阈值是不同的，因此可根据不同的显示面板的实际负载的实际电流情况设置不同的过流保护阈值，避免不同负载的显示面板的过流保护阈值过高或过低的情况，避免发生过流保护阈值过低，显示面板多次误出发过流保护的情况，也避免了过流保护阈值过高，显示面板出现短路甚至烧毁，仍然未启用过流保护的情况。
附图说明
所包括的附图用来提供对本申请实施例的理解，其构成了说明书的一部分，示例本申请的实施方式，并与文字描述一起来阐释本申请的原理。显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。在附图中：
图1是本申请实施例时钟信号支路电压，电流变化差异的示意图；
图2是本申请实施例时钟信号支路电压，电流变化差异的示意图；
图3是本申请实施例一种过流保护方法流程的示意图；
图4是本申请实施例一种过流保护电路的示意图；
图5是本申请实施例一种显示装置的示意图。
具体实施方式
这里所公开的具体结构和功能细节仅仅是代表性的，并且是描述本申请的示例性实施例的目的。但是本申请可以通过许多替换形式来具体实现，并且不应当被解释成仅仅受限于这里所阐述的实施例。
在本申请的描述中，需要理解的是，术语“中心”、“横向”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个 或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。另外，术语“包括”及其任何变形，意图在于覆盖不排他的包含。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
这里所使用的术语仅仅是为了描述具体实施例而不意图限制示例性实施例。除非上下文明确地另有所指，否则这里所使用的单数形式“一个”、“一项”还意图包括复数。还应当理解的是，这里所使用的术语“包括”和/或“包含”规定所陈述的特征、整数、步骤、操作、单元和/或组件的存在，而不排除存在或添加一个或更多其他特征、整数、步骤、操作、单元、组件和/或其组合。
下面结合附图和实施例对本申请作说明。
如图1至图5所示，本申请实施例公布了一种过流保护方法和过流保护电路。
图1，图2为时钟信号支路电压，电流变化差异的示意图，其中，图1表示不同时钟信号支路负载差异对应电流与电压变化的影响；图2表示在t时刻时中信号支路电流与电压变化的差异。
如图3所示，3是本申请一种过流方法流程框图，一种过流保护方法，包括步骤：
S10:检测第一基板行驱动电路当前时钟信号支路的实时电流；
S11:根据实时电流输出对应的过流保护值到电平转移电路；
S12:将过流保护值设置为当前时钟信号支路的过流保护阈值；
S13:启用过流保护阈值，控制关闭电平转移电路；
S14:检测第一基板行驱动电路当前时钟信号支路的实时电流；
S15:将实时电流跟过流保护阈值进行对比，当实时电流大于或等于过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源，启动过流保护。
过流保护的一般性做法是计算一个合适的过流保护值之后，为各个显示面板设定固定的过流保护电流值作为保护的基准点，进行过流保护，但对于显示面板而言，因制程原因，不同的显示面板存在个体差异，显示面板内的各支路的负载不尽相同；若对显示面板内的各路电路统一设置一个过流保护阈值，这样可能无法对显示面板内某些过流保护阈值低的支路提前做过流保护，当某些过流保护阈值低的电路发生短路时，这些短路处会积累热量，进而导致显示面板烧毁。
本申请可以根据不同的显示面板内电路的负载差异，检测第一基板行驱动电路至少一条时钟信号支路的实时电流，依据实际电流的情况，为第一基板行驱动电路时钟信号支路设置对应的过流保护阈值进行过流保护，如此，由于实时电流和显示面板对应的负载是一致的，所以，不同负载的显示面板对应的过流保护的阈值是不同的，因此可根据不同的显示面板的实际负载的实际电流情况设置不同的过流保护阈值，避免不同负载的显示面板的过流保护阈值过高或过低的情况，避免发生过流保护阈值过低，显示面板多次误出发过流保护的情况，也避免了过流保护阈值过高，显示面板出现短路甚至烧毁，仍然未启用过流保护的情况。
其中，该第一基板一般是阵列基板，其他适用本方案的基板也可以采用的。
在一实施例中，所述根据实时电流输出对应的过流保护值到电平转移电路的步骤包括：
根据实时电流的电流斜率波形，从过流保护值查找表中查找到对应的过流保护值，并输出到电平转移电路；
所述过流保护值查找表存储在电源电路中，所述过流保护值查找表至少包括两组所述电流斜率波形的电流斜率值和所述过流保护阈值的对应数据。过流保护值查找表可以是基于实验数据统计得到的，也可以是通过公式计算得到的表示在正常工作下，得出多种电流斜率波形和过流保护阈值的对应数据；这样在对第一基板行驱动电路进行过流保护阈值设置时，可以设置更加符合第一基板行驱动电路的过流保护值，使得第一基板行驱动电路得到较好的保护，避免过流保护阈值和电路的实际情况发生太大的偏差，进而保证在阈值内显示面板的显示质量，避免出现电流值超过实际过流值还没进行电路保护的情况发生。
另外，如下表1所示为本申请过流保护值查找表：
Is1 Is2 …… Is N
OCP1 OCP2 …… OCP N
表1：电流斜率和过流保护值对应关系表
其中，Is1表示第一电流斜率值，OCP1表示第一过流保护值；
Is2表示第二电流斜率值，OCP2表示第二过流保护值；
IsN表示第N电流斜率值，OCPN表示第二过流保护值，N是大于等于1的自然数。
在一实施例中，所述过流保护值查找表的过流保护值是与实时电流斜率波形的峰值对应的。第一基板行驱动电路在正常工作下的电流存在波动的情况，实时电流斜率波形的峰值最能反应第一基板行驱动电路在正常工作下的电流波动变化情况，以实时电流斜率波形的峰值 作为预设过流保护阈值的参考，可以保证该过流保护阈值大于该峰值但又不会超出太大，如此，便可以避免电路因特殊原因在峰值处较低或者较高而造成过流保护阈值不对应的情况，保证第一基板行驱动电路可以得到正确的过流保护。
在一实施例中，所述过流保护值查找表的过流保护值是与实时电流斜率波形的斜率值对应的。
本方案中，实时电流斜率波形的电流斜率值，其实包含有峰值、电流持续时长、电流变化情况等数据，用该实时电流斜率波形的电流斜率值对应得到的过流保护阈值参考了最全面的数据，保证大部分情况下该过流保护阈值可以适用，保证显示面板的显示稳定性。
在一实施例中，所述启用过流保护阈值，控制关闭电平转移电路的步骤包括：
判断是否第一基板行驱动电路的所有时钟信号支路均已完成了过流保护阈值设置，若是，则控制关闭电平转移电路；
若否，则继续进行过流保护阈值设置的操作。
第一基板行驱动电路可以从中选取一条时钟信号支路进行测试，也可以从中挑选多条时钟信号支路进行测试并取平均值之后，将对应的过流保护阈值设置到所有的时钟信号支路。当然，该第一基板行驱动电路也可以遍历每条时钟信号支路，并为每条时钟信号支路单独设置过流保护阈值，以应对制作工艺所造成的不同支路的负载差异，例如，生产得到的第一基板行驱动电路时钟信号支路的长度不同造成电阻不同，则引起负载差异等情况，第一基板行驱动电路支路对电流或者电压的骤变发生错误判断，进而导致设定错误的过流保护阈值；另外，在完成过流保护阈值的设置之后，将电平转移电路进行关闭，可以避免因为检测到时钟信号支路中出现短路电流而设置一超过短路电流，并致使显示面板长期面对短路电流而影响显示效果甚至损伤显示面板。
在一实施例中，再次控制关闭电平转移电路的步骤包括：
判断是否第一基板行驱动电路的所有时钟信号支路均已完成了过流保护阈值设置，若是，则再次控制关闭电平转移电路；
若否，则继续进行过流保护阈值设置的操作。
在显示面板在长期使用之后，各行驱动电路的线路情况可能因为长期使用而磨损或者因为更替以及修补带来的行驱动电路负载情况和最初的负载情况不同的情况发生；电平转移电路可以再次开启，并重新进行检测而重新设置新的过流保护阈值,过流保护阈值有可能随着行驱动电路的电流或者电压的变化而改变，与原出厂时设置的过流保护阈值不同，根据线路实际情况进行及时的更新，可持续动态的给予第一基板行驱动电路以过流保护。
在一实施例中，启用过流保护阈值，关闭电平转移电路的步骤中：
所述电平转移电路被彻底关闭，无法重启。
电平转移电路被彻底关闭，无法重启，保证了电平转移电路不会被误启动,避免出现检测一过流电流而设置一超大过流保护阈值的情况发生，使得第一基板行驱动电路的到正确的过流保护，保障显示面板的正常工作，避免损伤和烧毁显示面板的情况发生。
图4为本申请一种过流保护电路示意图，在一实施例中，一种过流保护电路1，包括：侦测电路11,检测第一基板行驱动电路当前时钟信号支路的实时电流斜率波形；过流保护判断电路21，根据实时电流斜率波形的电流斜率值和过流保护值查找表进行对比判断，输出对应的过流保护值到电平转移电路；电平转移电路40，将过流保护值设置为当前时钟信号支路的过流保护阈值；所述过流保护判断电路还启用过流保护阈值，控制关闭电平转移电路；当所述电平转移电路40关闭时，所述过流保护判断电路21将实时电流斜率波形的电流斜率值跟过流保护阈值进行对比，当实时电流斜率值大于或等于对应的过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源、启动电路保护。
本方案中，通过检测第一基板行驱动电路当前时钟信号支路的实时电流斜率波形，对当前的时钟信号的支路设置对应的过流保护阈值，当行驱动电路实时电流阈值大于过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源、启动电路保护。如此，对于不同的时钟信号支路进行不同的过流保护设置，避免多条时钟信号支路使用一个固定的过流保护阈值，造成过流保护阈值低的时钟信号支路已经烧毁还得不到过流保护的情况发生。另外，过流保护查找表可以查考上述表1。
图5为本申请的一种显示装置的示意图，在一实施例中，公开了一种显示装置80，显示装置包括显示面板60，显示面板60包括上述过流保护电路1。
本方案中，显示装置可以根据显示面板60自身驱动电路负载的情况面，设定对应的过流保护阈值，如此，便可以针对不同面板可以进行不同过流保护阈值的设置，避免不同显示面板60使用同一个过流保护阈值，造成过流保护阈值低的面板已经烧毁还得不到过流保护的情况发生。
需要说明的是，本方案中涉及到的各步骤的限定，在不影响具体方案实施的前提下，并不认定为对步骤先后顺序做出限定，写在前面的步骤可以是在先执行的，也可以是在后执行的，甚至也可以是同时执行的，只要能实施本方案，都应当视为属于本申请的保护范围。
本申请的技术方案可以广泛TN面板(全称为Twisted Nematic，即扭曲向列型面板)、IPS面板(In-Plane Switching，平面转换)、VA面板(Multi-Domain Vertical Alignment，多象限垂直配向技术)，当然，也可以是其他类型的面板，适用即可。
以上内容是结合具体的实施方式对本申请所作的详细说明，不能认定本申请地具体实施 只局限于这些说明。对于本申请所属技术领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本申请的保护范围。

Claims (18)

  1. 一种过流保护方法，包括步骤：
    检测第一基板行驱动电路当前时钟信号支路的实时电流；
    根据实时电流输出对应的过流保护值到电平转移电路；
    将过流保护值设置为当前时钟信号支路的过流保护阈值；
    启用过流保护阈值，控制关闭电平转移电路；
    检测第一基板行驱动电路当前时钟信号支路的实时电流；以及
    将实时电流跟过流保护阈值进行对比，当实时电流大于或等于过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源，启动过流保护。
  2. 如权利要求1所述的一种过流保护方法，其中，所述根据实时电流输出对应的过流保护值到电平转移电路的步骤包括：
    根据实时电流的电流斜率波形，从过流保护值查找表中查找到对应的过流保护值，并输出到电平转移电路。
  3. 如权利要求2所述的一种过流保护方法，其中，所述过流保护值查找表存储在电源芯片中，所述过流保护值查找表至少包括两组所述电流斜率波形的电流斜率值和所述过流保护阈值的对应数据。
  4. 如权利要求3所述的一种过流保护方法，其中，所述过流保护值查找表的过流保护值是与实时电流斜率波形的峰值对应的。
  5. 如权利要求2所述的一种过流保护方法，其中，所述过流保护值查找表的过流保护值是与实时电流斜率波形的斜率值对应的。
  6. 如权利要求1所述的一种过流保护方法，其中，所述将实时电流跟过流保护阈值进行对比，当实时电流大于或等于过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源，启动过流保护的步骤包括：
    当所述电平转移电路关闭时，将实时电流的斜率波形的电流斜率值，跟过流保护阈值进行对比，当实时电流斜率值大于或等于对应的过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源、启动电路保护。
  7. 如权利要求1所述的一种过流保护方法，其中，所述启用过流保护阈值，控制关闭电平转移电路的步骤包括：
    判断是否第一基板行驱动电路的所有时钟信号支路均已完成了过流保护阈值设置，若是，则控制关闭电平转移电路。
  8. 如权利要求7所述的一种过流保护方法，其中，所述启用过流保护阈值，控制关闭电平转移电路的步骤包括：
    判断是否第一基板行驱动电路的所有时钟信号支路均已完成了过流保护阈值设置，若否，则继续进行过流保护阈值设置的操作。
  9. 如权利要求8所述的一种过流保护方法，其中，所述启用过流保护阈值，控制关闭电平转移电路的步骤之后还包括步骤：
    当检测到所述电平转移电路重新启动时，重新检测第一基板行驱动电路的当前时钟信号支路的实时电流。
  10. 如权利要求9所述的一种过流保护方法，其中，当检测到所述电平转移电路重新启动时，重新检测第一基板行驱动电路的当前时钟信号支路的实时电流后，还包括步骤：
    根据检测得到的实时电流，输出对应的过流保护值到电平转移电路。
  11. 如权利要求10所述的一种过流保护方法，其中，根据检测得到的实时电流，输出对应的过流保护值到电平转移电路后，还包括步骤：
    电平转移电路将过流保护值设置为当前时钟信号支路的过流保护阈值。
  12. 如权利要求11所述的一种过流保护方法，其中，电平转移电路将过流保护值设置为当前时钟信号支路的过流保护阈值后，还包括步骤：
    再次控制关闭电平转移电路。
  13. 如权利要求12所述的一种过流保护方法，其中，所述再次控制关闭电平转移电路的步骤包括：
    判断是否第一基板行驱动电路的所有时钟信号支路均已完成了过流保护阈值设置，若是，则再次控制关闭电平转移电路。
  14. 如权利要求12所述的一种过流保护方法，其中，所述再次控制关闭电平转移电路的步骤包括：
    判断第一基板行驱动电路的所有时钟信号支路均为完成了过流保护阈值设置，若否，则继续进行过流保护阈值设置的操作。
  15. 如权利要求1所述的一种过流保护方法，其中，所述启用过流保护阈值，关闭电平转移电路的步骤中：
    所述电平转移电路被彻底关闭，无法重启。
  16. 一种过流保护电路，包括:
    侦测电路,检测第一基板行驱动电路当前时钟信号支路的实时电流斜率波形；
    过流保护判断电路，根据实时电流斜率波形的电流斜率值和过流保护值查找表进行对比 判断，输出对应的过流保护值到电平转移电路；以及
    电平转移电路，将过流保护值设置为当前时钟信号支路的过流保护阈值；
    其中，所述过流保护判断电路启用过流保护阈值，控制关闭电平转移电路。
  17. 如权利要求16所述一种过流保护电路，其中，当所述电平转移电路关闭时，所述过流保护判断电路将实时电流斜率波形的电流斜率值跟过流保护阈值进行对比，当实时电流斜率值大于或等于对应的过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源、启动电路保护。
  18. 一种显示装置，所述显示装置包括显示面板，所述显示面板包括过流保护电路，所述过流保护电路包括：
    侦测电路,检测第一基板行驱动电路当前时钟信号支路的实时电流斜率波形；
    过流保护判断电路，根据实时电流斜率波形的电流斜率值和过流保护值查找表进行对比判断，输出对应的过流保护值到电平转移电路；以及
    电平转移电路，将过流保护值设置为当前时钟信号支路的过流保护阈值；
    其中，所述过流保护判断电路还启用过流保护阈值，控制关闭电平转移电路；
    当所述电平转移电路关闭时，所述过流保护判断电路将实时电流斜率波形的电流斜率值跟过流保护阈值进行对比，当实时电流斜率值大于或等于对应的过流保护阈值时，关断第一基板行驱动电路当前时钟信号支路的电源、启动电路保护。
PCT/CN2019/073637 2018-12-27 2019-01-29 过流保护方法、过流保护电路和显示装置 Ceased WO2020133634A1 (zh)

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