WO2020010698A1 - 液晶显示装置的开机控制方法及液晶显示装置 - Google Patents

液晶显示装置的开机控制方法及液晶显示装置 Download PDF

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WO2020010698A1
WO2020010698A1 PCT/CN2018/106601 CN2018106601W WO2020010698A1 WO 2020010698 A1 WO2020010698 A1 WO 2020010698A1 CN 2018106601 W CN2018106601 W CN 2018106601W WO 2020010698 A1 WO2020010698 A1 WO 2020010698A1
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temperature
liquid crystal
crystal display
display device
ambient temperature
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PCT/CN2018/106601
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English (en)
French (fr)
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张先明
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深圳市华星光电半导体显示技术有限公司
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Priority to US16/304,303 priority Critical patent/US20210116740A1/en
Publication of WO2020010698A1 publication Critical patent/WO2020010698A1/zh

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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
    • 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • 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
    • G09G3/3406—Control of illumination source
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • 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
    • 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
    • G09G2330/026—Arrangements or methods related to booting a display

Definitions

  • the present invention relates to the field of display technology, and in particular, to a startup control method of a liquid crystal display device and a liquid crystal display device.
  • the liquid crystal display has many advantages such as a thin body, power saving, and no radiation, and has been widely used. Such as: LCD TVs, mobile phones, personal digital assistants (PDAs), digital cameras, computer screens or laptop screens, etc., which dominate the flat panel display field.
  • LCD TVs liquid crystal display
  • mobile phones mobile phones
  • PDAs personal digital assistants
  • digital cameras digital cameras
  • computer screens or laptop screens etc., which dominate the flat panel display field.
  • the backlight module is one of the key components of a liquid crystal display. Since the liquid crystal panel itself cannot emit light, the function of the backlight module is to provide sufficient brightness and a uniformly distributed light source so that it can display images normally.
  • the existing backlight module is generally an LED backlight module using an LED (light emitting diode) as a light source.
  • the GOA Array Substrate Line Drive
  • TFT thin film transistor liquid crystal display array manufacturing process to fabricate a gate scan drive circuit on a thin film transistor array substrate to achieve a progressive scan drive method, which reduces production costs and realizes LCD panels
  • the advantages of the narrow bezel design are used by a variety of displays.
  • the problem of low-temperature startup is a problem often encountered with array substrate row drive models. Due to the drift of the characteristics of the thin film transistor at low temperature, it can not be started at low temperature or the startup is abnormal, and display problems occur.
  • a VGH voltage gate-on voltage
  • a higher gate-on voltage is used at a low temperature, so that the thin film transistor can be normally turned on and displayed normally.
  • this method only guarantees that the thin film transistor can be turned on normally, and the change in the characteristics of the liquid crystal panel cannot be improved, and if the power is turned on at a lower temperature, there is also a possibility of strangeness.
  • problems such as slow response, afterimages, decreased contrast, and uneven color due to low temperature are likely to occur, which greatly affects the display quality.
  • an object of the present invention is to provide a startup control method for a liquid crystal display device, which detects the ambient temperature during startup and performs corresponding startup operations according to the temperature range.
  • Another object of the present invention is to provide a liquid crystal display device, which detects the ambient temperature during startup and performs corresponding startup operations according to the temperature range.
  • the present invention provides a startup control method, including:
  • Step 10 Detect the ambient temperature before starting
  • Step 20 Determine whether the ambient temperature is higher than or equal to the first temperature
  • Step 30 If the ambient temperature is higher than or equal to the first temperature, control the liquid crystal display device to boot normally; otherwise, execute step 40.
  • Step 40 Determine whether the ambient temperature is higher than or equal to a second temperature, where the second temperature is lower than the first temperature;
  • Step 50 If the ambient temperature is higher than or equal to the second temperature, control the backlight module to be fully lit, heat the liquid crystal panel, and then return to step 10.
  • the method further includes:
  • Step 60 If the ambient temperature is lower than the second temperature, control the liquid crystal display device not to be turned on.
  • step 60 further comprises: controlling the liquid crystal display device to issue an alarm message.
  • the first temperature is 0 ° C and the second temperature is minus 20 ° C.
  • the backlight module is controlled to be fully lit by PWM dimming, analog dimming, and / or a backlight on signal to heat the liquid crystal panel.
  • step 10 the ambient temperature is detected by a temperature detection circuit.
  • the temperature detection circuit includes a thermistor, and the ambient temperature is characterized by detecting a partial voltage on the thermistor.
  • the first temperature and the second temperature are characterized as a first voltage and a second voltage, respectively, and the range of the temperature is confirmed by comparing the first voltage and the second voltage with the partial voltage, respectively.
  • the comparator compares the first voltage or the second voltage with the divided voltage.
  • the invention also provides a liquid crystal display device, including:
  • Detection module for detecting ambient temperature before starting
  • a first determining module configured to determine whether the ambient temperature is higher than or equal to the first temperature
  • a booting module configured to control the liquid crystal display device to boot normally if the ambient temperature is higher than or equal to the first temperature
  • a second determining module configured to determine whether the ambient temperature is higher than or equal to a second temperature when the ambient temperature is lower than the first temperature, wherein the second temperature is lower than the first temperature;
  • the heating module is configured to control the backlight module to be fully lit and heat the liquid crystal panel if the ambient temperature is higher than or equal to the second temperature.
  • the start-up control method of the liquid crystal display device and the liquid crystal display device of the present invention detect the ambient temperature before the startup. If the ambient temperature is greater than the first temperature, the system starts normally; if the ambient temperature is lower than the first temperature, Above two temperatures, first heat the liquid crystal panel through the backlight with high power, and then turn it on after the ambient temperature is restored; avoid the liquid crystal display device working at low temperatures to protect the liquid crystal display device.
  • FIG. 1 is a flowchart of a startup control method of a liquid crystal display device according to the present invention
  • FIG. 2 is a schematic diagram of a temperature detection circuit of a preferred embodiment of a method for controlling a startup of a liquid crystal display device according to the present invention
  • FIG. 3 is a schematic circuit diagram of a preferred embodiment of a method for controlling a startup of a liquid crystal display device according to the present invention for confirming a temperature range;
  • FIG. 4 is a structural block diagram of a preferred embodiment of a liquid crystal display device according to the present invention.
  • the startup control method of the liquid crystal display device of the present invention mainly includes:
  • Step 10 Detect the ambient temperature before booting.
  • a liquid crystal display device such as an LCD TV
  • it is mainly composed of a backlight module (BLU) and a liquid crystal panel.
  • the backlight module is generally composed of many LEDs and backlight drivers.
  • SOC system-on-chip
  • Two temperature protection points can be set in advance: the first temperature, which is a low temperature set point, such as 0 ° C, It can be set as the critical temperature that can be turned on normally; and the second temperature, that is, a severe temperature point, such as -20 ° C, can be set as the critical temperature that needs to be turned on after heating; among them, the second temperature is even lower than the first temperature, That is, the severe temperature point is lower than the low temperature set point;
  • Step 20 Determine whether the ambient temperature is higher than or equal to the first temperature; compare the ambient temperature with a preset first temperature, and determine the range of the ambient temperature;
  • Step 30 If the ambient temperature is higher than or equal to the first temperature, control the liquid crystal display device to be turned on normally; otherwise, execute step 40; if the ambient temperature is higher than or equal to the first temperature, verify that the liquid crystal panel is at a normal ambient temperature. Work, you can boot normally;
  • Step 40 Determine whether the ambient temperature is higher than or equal to a second temperature, wherein the second temperature is lower than the first temperature; compare the ambient temperature with a preset second temperature to determine the range of the ambient temperature;
  • Step 50 If the ambient temperature is higher than or equal to the second temperature, control the backlight module to be fully lit, heat the LCD panel, and then return to step 10.
  • the time for the backlight module to heat the LCD panel can be set in advance. Return to step 10 to re-detect the ambient temperature, and then perform the startup control according to the detected ambient temperature.
  • the system-on-chip of the liquid crystal display device uses the PWM (pulse width modulation) dimming, analog dimming, and / or BLON (backlight on) signals to cause the backlight module to turn on fully, further, It can even be driven in a short period of time based on the current resistance of the LED by heating a larger current than normal operation, heating the backplane and the LCD panel, and starting normally after the temperature rises.
  • the LCD can be changed.
  • the panel lifting temperature is above 20 ° C. If the driving current is increased, the temperature can be increased to above the first temperature in a short time.
  • the above method may further include: Step 60: If the ambient temperature is lower than the second temperature, control the liquid crystal display device not to be turned on; further may include: controlling the liquid crystal display device to issue an alarm message.
  • the present invention can be designed such that if the ambient temperature detected before the boot is a temperature below the second temperature, the boot will not be performed, preventing the permanent TFT characteristics from being damaged due to the poor TFT characteristics after the boot. If the ambient temperature is lower than the second temperature, the system-on-chip of the liquid crystal display device will not perform the booting action, but may choose to notify the user through the speaker that the temperature is too low to boot.
  • the method of the invention can realize the detection of low temperature, ensure that the liquid crystal display device can work normally at a low temperature of -20 ° C or more, and perform protection under a more severe low temperature condition to prevent the liquid crystal display device from being damaged.
  • FIG. 2 is a schematic diagram of a temperature detection circuit according to a preferred embodiment of the boot control method of the present invention, which is used to illustrate a circuit that a system-level chip can use to detect ambient temperature.
  • the basic circuit is as follows.
  • the resistor R3 is connected in parallel between one end of the first resistor R1 and the ground.
  • the other end of the first resistor R1 is connected to the working voltage VDD.
  • the working voltage VDD is divided by the first resistor R1, the second resistor R2, and the thermistor R3. Voltage V1.
  • the ambient temperature is characterized by detecting the partial voltage V1 on the thermistor R3.
  • the preset first temperature and the second temperature may be characterized as a first voltage Vref1 and a second voltage Vref2, respectively, where the first voltage Vref1 represents the first temperature, The second voltage Vref2 represents a second temperature, and the first voltage Vref1 ⁇ the second voltage Vref2.
  • the first voltage Vref1 and the second voltage Vref2 are compared with the divided voltage V1 to confirm the temperature range.
  • the first comparator OP1 and the second comparator OP2 can be used for comparison.
  • the first comparator OP1 inputs a divided voltage V1 at the non-inverting input terminal, and inputs the first voltage Vref1 at the inverting input terminal to output the first comparison result. EN1; the non-inverting input terminal of the second comparator OP2 inputs the divided voltage V1, the inverting input terminal inputs the second voltage Vref2, and outputs the second comparison result EN2.
  • the configuration of the first voltage Vref1 and the second voltage Vref2 and the input terminal of the comparator is related to the temperature coefficient of the thermistor R3.
  • the thermistor R3 is a negative temperature coefficient; when the thermistor R3 is When the temperature coefficient is positive, the above configuration can be adjusted accordingly.
  • FIGS. 2 and 3 have a simple structure and are easy to implement, and are only used to illustrate the present invention.
  • the present invention can also use other circuits and / or functional modules that can implement corresponding functions.
  • FIG. 4 it is a structural block diagram of a preferred embodiment of a liquid crystal display device according to the present invention, which mainly includes: a detection module 1 for detecting an ambient temperature before booting; a system-level chip may be used for detecting the ambient temperature before booting, Used to determine the ambient temperature of the liquid crystal panel; a first judgment module 2 is used to judge whether the ambient temperature is higher than or equal to the first temperature; a booting module 3 is used if the ambient temperature is higher than or equal to the first temperature Temperature, control the liquid crystal display device to be turned on normally; if the ambient temperature is higher than or equal to the first temperature, it proves that the liquid crystal panel works at normal ambient temperature and can be turned on normally; the second judgment module 4 is used in the environment When the temperature is lower than the first temperature
  • the time for the backlight module to heat the LCD panel can be set in advance. After heating for a certain period of time, the detection module 1 is used to re-detect the ambient temperature, and then each module is used to perform the detection according to the detected ambient temperature. Startup control.
  • the start-up control method of the liquid crystal display device and the liquid crystal display device of the present invention detect the ambient temperature before the startup. If the ambient temperature is greater than the first temperature, the system starts normally; if the ambient temperature is lower than the first temperature, Above two temperatures, first heat the liquid crystal panel through the backlight with high power, and then turn it on after the ambient temperature is restored; avoid the liquid crystal display device working at low temperatures to protect the liquid crystal display device.

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Abstract

提供一种液晶显示装置的开机控制方法及液晶显示装置。该开机控制方法包括：步骤10、开机前侦测环境温度；步骤20、判断环境温度是否高于或等于第一温度；步骤30、若环境温度高于或等于第一温度，则控制液晶显示装置正常开机；否则执行步骤40；步骤40、判断环境温度是否高于或等于第二温度，其中第二温度低于第一温度；步骤50、若环境温度高于或等于第二温度，则控制背光模组全亮，加热液晶面板，然后返回步骤10。在开机时侦测环境温度，若环境温度大于第一温度，则正常开机；若环境温度低于第一温度，但又在第二温度以上，先通过背光高功率加热液晶面板，待环境温度恢复后再开机，避免液晶显示装置在低温下工作。

Description

液晶显示装置的开机控制方法及液晶显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种液晶显示装置的开机控制方法及液晶显示装置。
背景技术
液晶显示器具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。如：液晶电视、移动电话、个人数字助理(PDA)、数字相机、计算机屏幕或笔记本电脑屏幕等，在平板显示领域中占主导地位。
现有市场上的液晶显示器大部分为背光型液晶显示器，包括液晶面板及背光模组。背光模组为液晶显示器的关键组件之一，由于液晶面板本身不能发光，背光模组的功能在于提供充足的亮度及分布均匀的光源，使其能够正常的显示影像。现有背光模组一般是采用LED(发光二极管)作为光源的LED背光模组。
GOA(阵列基板行驱动)技术是利用TFT(薄膜晶体管)液晶显示器阵列制程将栅极扫描驱动电路制作在薄膜晶体管阵列基板上，以实现逐行扫描的驱动方式，具有降低生产成本和实现液晶面板窄边框设计的优点，为多种显示器所使用。
低温开机问题是阵列基板行驱动机种经常碰到的问题，由于薄膜晶体管在低温下特性漂移，导致其在低温下无法开机或者开机画异，出现显示问题。现有技术是使用VGH电压(栅极导通电压)做温补，在低温下使用更高的栅极导通电压，使薄膜晶体管能够正常打开，且正常显示。但是这种方法只是保证薄膜晶体管能够正常打开，针对于液晶面板内的特性变化无法改善，且如果更低温下的开机，同样有几率出现画异。当液晶显示器处于低温环境下，很可能发生因温度过低而造成反应变慢、残影、对比下降、色彩不均等问题，使显示质量大受影响。
发明内容
因此，本发明的目的在于提供一种液晶显示装置的开机控制方法，开机时侦测环境温度，根据温度所在范围进行对应开机操作。
本发明的另一目的在于提供一种液晶显示装置，开机时侦测环境温度，根据温度所在范围进行对应开机操作。
为实现上述目的，本发明提供了一种开机控制方法，包括：
步骤10、开机前侦测环境温度；
步骤20、判断所述环境温度是否高于或等于第一温度；
步骤30、若所述环境温度高于或等于第一温度，则控制所述液晶显示装置正常开机；否则执行步骤40；
步骤40、判断所述环境温度是否高于或等于第二温度，其中，第二温度低于第一温度；
步骤50、若所述环境温度高于或等于第二温度，则控制背光模组全亮，加热液晶面板，然后返回步骤10。
其中，所述方法还包括：
步骤60、若所述环境温度低于第二温度，则控制液晶显示装置不开机。
其中，步骤60还包括：控制所述液晶显示装置发出报警信息。
其中，所述第一温度为0℃；所述第二温度为零下20℃。
其中，步骤50中，通过PWM调光、模拟调光、和/或背光开启信号控制背光模组全亮以加热液晶面板。
其中，步骤10中，通过温度侦测电路侦测环境温度。
其中，所述温度侦测电路包括热敏电阻，通过侦测所述热敏电阻上的分压以表征环境温度。
其中，将第一温度和第二温度分别表征为第一电压和第二电压，通过将所述第一电压和第二电压分别和所述分压进行比较以确认温度所在范围。
其中，通过比较器将所述第一电压或第二电压和所述分压进行比较。
本发明还提供了一种液晶显示装置，包括：
侦测模块，用于开机前侦测环境温度；
第一判断模块，用于判断所述环境温度是否高于或等于第一温度；
开机模块，用于若所述环境温度高于或等于第一温度，则控制所述液晶显示装置正常开机；
第二判断模块，用于在所述环境温度低于第一温度时，判断所述环境温度是否高于或等于第二温度，其中，第二温度低于第一温度；
加热模块，用于若所述环境温度高于或等于第二温度，则控制背光模组全亮，加热液晶面板。
综上，本发明的液晶显示装置的开机控制方法及液晶显示装置，开机前侦测环境温度，若环境温度大于第一温度，则正常开机；若环境温度低于第一温度，但又在第二温度以上，先通过背光高功率加热液晶面板，待环境温度恢复后再开机；避免液晶显示装置在低温下工作，以保护液晶显 示装置。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为本发明液晶显示装置的开机控制方法的流程图；
图2为本发明液晶显示装置的开机控制方法一较佳实施例的温度侦测电路原理示意图；
图3为本发明液晶显示装置的开机控制方法一较佳实施例用于确认温度范围的电路原理示意图；
图4为本发明液晶显示装置一较佳实施例的结构方框图。
具体实施方式
参见图1，其为本发明液晶显示装置的开机控制方法的流程图。本发明液晶显示装置的开机控制方法主要包括：
步骤10、开机前侦测环境温度；对于一台液晶显示装置，例如液晶电视，其主要由背光模组(BLU)以及液晶面板组成，背光模组一般是由很多LED以及背光驱动组成；在液晶电视开机时可以先使用系统级芯片(SOC)侦测环境温度，用以判断液晶面板所处于的环境温度；可以预先设置两个温度保护点：第一温度，即低温设置点，例如0℃，可以设定为可以正常开机的临界温度；以及第二温度，即恶劣温度点，例如-20℃，可以设定为需要加热后开机的临界温度；其中，第二温度更低于第一温度，即恶劣温度点更低于低温设置点；
步骤20、判断所述环境温度是否高于或等于第一温度；比较环境温度与预设的第一温度，判断环境温度所处范围；
步骤30、若所述环境温度高于或等于第一温度，则控制所述液晶显示装置正常开机；否则执行步骤40；若环境温度高于或等于第一温度，证明液晶面板在正常的环境温度下工作，可以正常开机；
步骤40、判断所述环境温度是否高于或等于第二温度，其中，第二温度低于第一温度；比较环境温度与预设的第二温度，判断环境温度所述范围；
步骤50、若所述环境温度高于或等于第二温度，则控制背光模组全亮，加热液晶面板，然后返回步骤10；可以预先设定背光模组加热液晶面板的 时间，加热一定时间后返回步骤10重新侦测环境温度，然后根据侦测到的环境温度按步骤执行开机控制。
应用本发明的开机控制方法，若环境温度低于第一温度，但又在第二温度以上，开机前先通过背光模组高功率加热液晶面板，待温度恢复后再开机；本发明利用背光模组进行加热，无需额外增加加热装置，方案设计简单，节约成本。利用背光模组进行加热时，液晶显示装置的系统级芯片通过PWM(脉宽调制)调光、模拟调光、和/或BLON(背光开启)信号，促使背光模组开全亮，更进一步，甚至于可以根据LED的耐流，在短时间通过比正常工作更大的电流进行驱动，加热背板以及液晶面板，待温度回升后开始正常开机，按照目前LED背光模组的温度，可以将液晶面板提升温度20℃以上，若再加上驱动电流的增大，则可以在短时间内将温度提升至第一温度以上。
上述方法还可以包括：步骤60、若所述环境温度低于第二温度，则控制液晶显示装置不开机；进一步可以包括：控制所述液晶显示装置发出报警信息。本发明可以设计为，若开机前侦测的环境温度为在第二温度以下的温度，则不会开机，防止开机后恶劣的TFT特性造成液晶面板的永久性损坏。若环境温度低于第二温度，液晶显示装置的系统级芯片不会做开机动作，但是可以选择通过喇叭告知使用者温度过低，无法开机。通过本发明的方法可以实现对于低温的侦测，保证液晶显示装置在低温-20℃以上都可以正常工作，且在更恶劣的低温情况下进行保护，防止出现液晶显示装置损坏的情况。
图2为本发明开机控制方法一较佳实施例的温度侦测电路原理示意图，用于举例说明系统级芯片侦测环境温度时可采用的电路，其基本电路如下，第二电阻R2和热敏电阻R3两者并联于第一电阻R1一端与地之间，第一电阻R1另一端连接工作电压VDD，工作电压VDD通过第一电阻R1、第二电阻R2及热敏电阻R3进行分压得到分压V1，在此实施例中通过侦测热敏电阻R3上的分压V1来表征环境温度。
图3为本发明开机控制方法一较佳实施例用于确认温度范围的电路原理示意图。对应于表征环境温度的分压V1，在此实施例中可以将预设的第一温度和第二温度分别表征为第一电压Vref1和第二电压Vref2，其中第一电压Vref1代表第一温度，第二电压Vref2代表第二温度，第一电压Vref1<第二电压Vref2，通过将所述第一电压Vref1和第二电压Vref2分别和所述分压V1进行比较以确认温度所在范围。如图3所示，可以通过第一比较器OP1和第二比较器OP2进行比较，第一比较器OP1同相输入端输入分压 V1，反相输入端输入第一电压Vref1，输出第一比较结果EN1；第二比较器OP2同相输入端输入分压V1，反相输入端输入第二电压Vref2，输出第二比较结果EN2。上述第一电压Vref1和第二电压Vref2，以及比较器的输入端的配置与热敏电阻R3的温度系数相关，在此较佳实施例中热敏电阻R3为负温度系数；当热敏电阻R3为正温度系数时，上述配置可以做相应调整。
第一比较器OP1和第二比较器OP2将第一电压Vref1和第二电压Vref2与分压V1进行比较判断，产生第一比较结果EN1和第二比较结果EN2后，针对于第一比较结果EN1/第二比较结果EN2产生的真值表如下表一所示，用以代表不同的开机操作情况，并可以根据相应的结果通过系统级芯片进行下一步的动作。系统级芯片可以根据获得的第一比较结果EN1/第二比较结果EN2的值，按照预设的真值表选择相应的开机操作。
Figure PCTCN2018106601-appb-000001
表一、第一比较结果EN1/第二比较结果EN2真值表
本领域技术人员可以理解，图2及图3所附电路结构简单，易于实现，仅用于举例说明本发明，本发明也可以采用其他可以实现相应功能的电路和/或功能模块。
本领域技术人员可以理解，本发明的开机控制方法中全部或部分步骤可以通过硬件来完成，也可以通过程序来控制相关的硬件完成。相应的，本发明提供了一种液晶显示装置。参见图4，其为本发明液晶显示装置一较佳实施例的结构方框图，主要包括：侦测模块1，用于开机前侦测环境温度；开机时可以先使用系统级芯片侦测环境温度，用以判断液晶面板所处于的环境温度；第一判断模块2，用于判断所述环境温度是否高于或等于第一温度；开机模块3，用于若所述环境温度高于或等于第一温度，则控制所述液晶显示装置正常开机；若环境温度高于或等于第一温度，证明液晶面板在正常的环境温度下工作，可以正常开机；第二判断模块4，用于在所述环境温度低于第一温度时，判断所述环境温度是否高于或等于第二温度，其中，第二温度低于第一温度；当所述环境温度低于第一温度时，通过判断所述环境温度是否高于或等于第二温度，确定是否可以加热液晶面板；加热模块5，用于若所述环境温度高于或等于第二温度，则控制背光模组全亮，加 热液晶面板；可以预先设定背光模组加热液晶面板的时间，加热一定时间后利用侦测模块1重新侦测环境温度，然后根据侦测到的环境温度利用各模块进行开机控制。
综上，本发明的液晶显示装置的开机控制方法及液晶显示装置，开机前侦测环境温度，若环境温度大于第一温度，则正常开机；若环境温度低于第一温度，但又在第二温度以上，先通过背光高功率加热液晶面板，待环境温度恢复后再开机；避免液晶显示装置在低温下工作，以保护液晶显示装置。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (10)

  1. 一种液晶显示装置的开机控制方法，包括：
    步骤10、开机前侦测环境温度；
    步骤20、判断所述环境温度是否高于或等于第一温度；
    步骤30、若所述环境温度高于或等于第一温度，则控制所述液晶显示装置正常开机；否则执行步骤40；
    步骤40、判断所述环境温度是否高于或等于第二温度，其中，第二温度低于第一温度；
    步骤50、若所述环境温度高于或等于第二温度，则控制背光模组全亮，加热液晶面板，然后返回步骤10。
  2. 如权利要求1所述的液晶显示装置的开机控制方法，还包括：
    步骤60、若所述环境温度低于第二温度，则控制液晶显示装置不开机。
  3. 如权利要求2所述的液晶显示装置的开机控制方法，其中，步骤60还包括：控制所述液晶显示装置发出报警信息。
  4. 如权利要求1所述的液晶显示装置的开机控制方法，其中，所述第一温度为0℃；所述第二温度为零下20℃。
  5. 如权利要求1所述的液晶显示装置的开机控制方法，其中，步骤50中，通过PWM调光、模拟调光、和/或背光开启信号控制背光模组全亮以加热液晶面板。
  6. 如权利要求1所述的液晶显示装置的开机控制方法，其中，步骤10中，通过温度侦测电路侦测环境温度。
  7. 如权利要求6所述的液晶显示装置的开机控制方法，其中，所述温度侦测电路包括热敏电阻，通过侦测所述热敏电阻上的分压以表征环境温度。
  8. 如权利要求7所述的液晶显示装置的开机控制方法，其中，将第一温度和第二温度分别表征为第一电压和第二电压，通过将所述第一电压和第二电压分别和所述分压进行比较以确认温度所在范围。
  9. 如权利要求8所述的液晶显示装置的开机控制方法，其中，通过比较器将所述第一电压或第二电压和所述分压进行比较。
  10. 一种液晶显示装置，包括：
    侦测模块，用于开机前侦测环境温度；
    第一判断模块，用于判断所述环境温度是否高于或等于第一温度；
    开机模块，用于若所述环境温度高于或等于第一温度，则控制所述液晶显示装置正常开机；
    第二判断模块，用于在所述环境温度低于第一温度时，判断所述环境温度是否高于或等于第二温度，其中，第二温度低于第一温度；
    加热模块，用于若所述环境温度高于或等于第二温度，则控制背光模组全亮，加热液晶面板。
PCT/CN2018/106601 2018-07-09 2018-09-20 液晶显示装置的开机控制方法及液晶显示装置 WO2020010698A1 (zh)

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