WO2014048006A1 - 一种液晶面板的驱动电路、液晶面板及液晶显示装置 - Google Patents

一种液晶面板的驱动电路、液晶面板及液晶显示装置 Download PDF

Info

Publication number
WO2014048006A1
WO2014048006A1 PCT/CN2012/084086 CN2012084086W WO2014048006A1 WO 2014048006 A1 WO2014048006 A1 WO 2014048006A1 CN 2012084086 W CN2012084086 W CN 2012084086W WO 2014048006 A1 WO2014048006 A1 WO 2014048006A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
coupled
voltage
circuit
voltage dividing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/084086
Other languages
English (en)
French (fr)
Inventor
林柏伸
廖良展
王念茂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/703,899 priority Critical patent/US9013385B2/en
Publication of WO2014048006A1 publication Critical patent/WO2014048006A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264Details of driving circuits
    • G09G2310/0291Details of output amplifiers or buffers arranged for use in a driving circuit
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0223Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes

Definitions

  • the present invention relates to the field of displays, and more particularly to a driving circuit for a liquid crystal panel, a liquid crystal panel, and a liquid crystal display device.
  • a liquid crystal panel using an FT-LCD driving structure usually considers omitting a scanning line driven circuit board in order to reduce the cost, so that the gate driving signal needs to be routed from the inside of the liquid crystal panel to the scanning line.
  • the input voltage of the gate driver chip is generated from the driver IC (Power IC) of the control board via the source driver board (shown by X Board in Figure 1).
  • the gate driver needs to be wired inside the LCD panel (Wire On Array: WOA).
  • the trace is limited by the layout of the liquid crystal panel and the manufacturing process. When the current flows through the trace. Will produce a voltage difference.
  • STV is a frame sync signal
  • one cycle represents a frame (frame)
  • VGL_P is the VGL generated on the Control Board
  • VGL_C is the VGL on the LCD panel that reaches GDI or GD3.
  • VGL_C is in The upper half of a frame is pulled high, creating a significant voltage difference.
  • the technical problem to be solved by the present invention is to provide a driving circuit, a liquid crystal panel, and a liquid crystal display device of a liquid crystal panel which can reduce chromatic aberration of a liquid crystal panel.
  • a driving circuit for a liquid crystal panel wherein a driving circuit of the liquid crystal panel includes N gate driving chips coupled to a scanning line of the liquid crystal panel to output N different driving voltages for different gate driving chips on one side of the panel a compensation unit; the value N is equal to the number of gate driving chips provided on one side of the liquid crystal panel, wherein the farther the gate driving chip is from the driving source of the driving voltage, the larger the absolute value of the driving voltage output by the compensation unit is, which makes the difference The output voltage of the gate drive chip tends to be uniform.
  • the compensation unit includes:
  • a switching module coupled to an external sampling voltage
  • the output terminals of the switching module are respectively connected with an N-component voltage circuit, and the output ends of all the voltage dividing circuits are connected to the internal wiring of the liquid crystal panel, and are coupled to the gate driving chip through the internal wiring;
  • the switching module switches N times in a time period of one frame, and switches the sampling voltage to different voltage dividing circuits to form the different driving voltages. Since the technical solution adopts the switching module, the same sampling voltage can be switched to the voltage dividing circuit, and the voltage is divided by the voltage dividing circuit to output different voltages to the gate driving chip, and the number from the upper part to the lower part of the liquid crystal panel is increased. It is close to the upper half of the LCD panel. The higher the absolute value of the voltage obtained by the gate driver chip, the lower the absolute value of the voltage is. In this way, as long as the voltage divider circuit is properly designed, it will reach each gate after the loss of the WOA trace. The voltage of the pole drive chip can be kept consistent, which can effectively reduce the chromatic aberration of different display areas.
  • a control end of the switching module is coupled to a timing control circuit of a driving circuit of the liquid crystal panel, the timing control circuit identifies a gate driving chip that is performing a scanning operation, and an output control signal controls the switching module to switch to a corresponding Voltage divider circuit.
  • the timing control circuit controls the output signals of the scanning lines and the data lines of the liquid crystal panel. Therefore, the timing control circuit provides the control signals, and the operation state of the gate driving chips can be accurately determined. It is not necessary to additionally design a detection circuit, which is advantageous for the tube circuit.
  • the gate driving chip has two, the switching module includes a first controllable switch that is turned on at a high level and a second controllable switch that is turned on at a low level; the first controllable switch and An input end of the second controllable switch is coupled to the sampling voltage; an output thereof is coupled to a different voltage dividing circuit; a control terminal thereof is coupled to the timing control circuit, and a control signal of the timing control circuit is in a frame time period A low level signal and a high level signal are respectively outputted.
  • the existing controllable switches are divided into two types: low level driving and high level driving. Therefore, two types of controllable switches are connected in parallel, and only one control line is needed.
  • the conversion of the high and low level signals of the single tube can switch the sampling voltage to different voltage dividing circuits, and the circuit is simple, and the reliability is high, which is also beneficial for reducing the cost.
  • the switching module further includes a comparator, wherein the control ends of the first controllable switch and the second controllable switch are coupled to the control signal by a comparator, and the reference end of the comparator is coupled with the first A reference voltage, the comparator of which is coupled to the control signal.
  • the comparator Through the comparator, the control signal only needs to be compared with the first reference voltage. Above or below it, it corresponds to two different level outputs, so that even if the control signal changes with the magnitude of the reference voltage, even the control signal There are some fluctuations that do not affect the output of the comparator and are more reliable.
  • the two-component voltage circuit includes a first voltage dividing circuit and a second voltage dividing circuit, and one end of the first voltage dividing circuit and the second voltage dividing circuit is connected to a second reference voltage, and the other end is connected to the An internal wiring of the liquid crystal panel;
  • the first voltage dividing circuit includes a first resistor and a second resistor disposed in series, and an output end of the first controllable switch of the switching module is coupled to the first resistor and the second Between the resistors;
  • the second voltage dividing circuit includes a third resistor and a fourth resistor disposed in series, and an output of the second controllable switch of the switching module is coupled between the third resistor and the fourth resistor. This is a specific voltage divider circuit structure.
  • a control end of the switching module is coupled to a timing control circuit of a driving circuit of the liquid crystal panel, and the switching module includes a first controllable switch that is turned on at a high level and a second controllable switch that is turned on at a low level a control switch; an input end coupled to the sampling voltage; an output end coupled to a different voltage dividing circuit; the driving circuit of the liquid crystal panel further includes a comparator, the reference end of the comparator is coupled with a reference voltage, a comparison end coupled to an output of the timing control circuit, an output coupled to a control end of the first controllable switch and a second controllable switch, respectively; the timing control circuit is in a frame of time Outputting a low level signal and a high level signal during the period, and controlling, by the comparator, the first controllable switch and the second controllable switch to alternately switch; the two component voltage circuit comprises a first voltage dividing circuit And a second voltage dividing circuit, one end of the first voltage dividing circuit and the second voltage dividing
  • a liquid crystal display device comprising the above-described driving circuit of a liquid crystal panel.
  • a driving method of a liquid crystal panel comprising the steps A: outputting N different driving voltages for different gate driving chips on one side of the panel, the value N being equal to the number of gate driving chips provided on one side of the liquid crystal panel The farther from the gate driving chip of the driving source of the driving voltage, the absolute value of the output driving voltage is larger.
  • the external sampling voltage is switched to the N-component voltage circuit through the switching module, and the N-component voltage circuit outputs N different driving voltages to be coupled to different gate driving chips.
  • the color difference of the liquid crystal panel is due to the gate driving chip farther from the driving source of the driving voltage.
  • the invention can increase the compensation unit, and can output N different driving voltages, corresponding to the N gate driving chips on the liquid crystal panel side, the farther the driving source of the driving voltage is, the larger the absolute value of the corresponding driving voltage is. In this way, part or even all of the voltage drop of the trace line is offset, so that the output voltage of each gate drive chip tends to be uniform, thereby achieving the purpose of reducing the color difference of the liquid crystal panel.
  • FIG. 1 is a schematic diagram of a conventional liquid crystal panel
  • FIG. 2 is a schematic diagram of the principle of the driving chip of FIG. 1;
  • FIG. 3 is a schematic diagram of driving waveforms of the liquid crystal panel shown in FIG. 1; 4 is a schematic diagram of the principle of the embodiment of the present invention;
  • Figure 5 is a schematic diagram of driving waveforms of an embodiment of the present invention.
  • the invention discloses a liquid crystal display device.
  • the liquid crystal display device comprises a driving circuit of a liquid crystal panel.
  • the driving circuit of the liquid crystal panel comprises a different gate driving chip output on the side of the panel coupled with the scanning line of the liquid crystal panel.
  • N different driving voltage compensation units; the value N is equal to the number of gate driving chips provided on one side of the liquid crystal panel, wherein the gate driving chip farther from the driving source of the driving voltage, the driving voltage output by the compensation unit The larger the absolute value, the more consistent the output voltage of the different gate drive chips.
  • the compensation unit can output N sets of different driving voltages, corresponding to the N gate driving chips on one side of the liquid crystal panel, the farther the driving source of the driving voltage is, the larger the absolute value of the corresponding driving voltage is, so that The voltage drop of the traces can be partially or even completely offset, so that the output voltage of each gate drive chip tends to be uniform, thereby achieving the purpose of reducing the color difference of the liquid crystal panel.
  • the liquid crystal display device of the present embodiment includes a liquid crystal panel, and two gate driving chips are disposed on both sides of the liquid crystal panel, and a plurality of source driving chips are disposed on the upper portion of the liquid crystal panel, and the source driving chip passes through the source driving circuit board.
  • the driving of the entire liquid crystal panel is realized by a control circuit board, and a driving chip and a timing control circuit are disposed on the control circuit board.
  • the timing control circuit can also be integrated into the driving chip; the switching module of the present invention is disposed on the control circuit board. It can also be integrated into the driver chip.
  • the control end of the switching module is coupled to the timing control circuit T-con, and the timing control circuit outputs a control signal FBSW.
  • the control signal FBSW outputs a low level signal and a high level signal during a frame time period. Switch the module to switch.
  • the timing control circuit controls the output signals of the scan lines and the data lines of the liquid crystal panel, and therefore, the control signals are provided by the timing control circuit, and Accurately determine the operating state of the gate driver chip, no need to additionally design the detection circuit, which is beneficial to the tube circuit.
  • the switching module includes a first controllable switch Q1 that is turned on at a high level and a second controllable switch Q2 that is turned on at a low level; an input terminal thereof is coupled to the sampling voltage FB; and an output terminal thereof is coupled to the first voltage dividing circuit and A second voltage dividing circuit; its control terminal is coupled to the timing control circuit T-con through a comparator CF.
  • the reference terminal of the comparator CF is coupled to the first reference voltage
  • the comparison terminal is coupled to the control signal FBSW of the timing control circuit
  • the output terminals thereof are coupled to the control terminals of the first controllable switch Q1 and the second controllable switch Q2, respectively.
  • the control signal only needs to be compared with the first reference voltage. Above or below it, it corresponds to two different level outputs, so that even if the control signal changes with the magnitude of the reference voltage, even the control signal There are some fluctuations that do not affect the output of the comparator and are more reliable.
  • the two-component voltage circuit of this embodiment includes a first voltage dividing circuit and a second voltage dividing circuit, one end of the first voltage dividing circuit and the second voltage dividing circuit is connected to the second reference voltage VREF, and the other end is connected to the liquid crystal panel.
  • the first voltage dividing circuit includes a first resistor R1 and a second resistor R2 arranged in series, and an output end of the first controllable switch Q1 of the switching module is coupled between the first resistor R1 and the second resistor R2;
  • the two-divider circuit includes a third resistor R3 and a fourth resistor R4 arranged in series, and an output of the second controllable switch Q2 of the switching module is coupled between the third resistor R3 and the fourth resistor R4.
  • the sampling voltage FB passes through the first voltage dividing circuit to divide and sample the first resistor R1 and the second resistor R2 to obtain a voltage FBI; the second voltage dividing circuit passes the voltage division and sampling of the third resistor R3 and the fourth resistor R4.
  • the voltage FB2 is obtained.
  • the second reference voltage VREF and the first reference voltage can be kept consistent, as shown in the figure 1.25V, which can be easily obtained from existing circuits without increasing the complexity of the circuit.
  • the existing controllable switches are divided into two types: low level driving and high level driving. Therefore, two types of controllable switches are connected in parallel, only one control line is needed, and the high and low level signals are converted through the single unit. , the sampling voltage can be switched to different voltage dividing circuits, the circuit is single, the reliability is high, and the cost is also reduced.
  • the invention also discloses a driving method of a liquid crystal panel, comprising the steps A: outputting N different driving voltages for different gate driving chips on one side of the panel, the value N being equal to the gate provided on one side of the liquid crystal panel The number of driving chips, wherein the gate driving chip farther from the driving source of the driving voltage, the larger the absolute value of the output driving voltage.
  • the external sampling voltage is switched to the N-component voltage circuit through the switching module, and the N-component voltage circuit outputs N different driving voltages to be coupled to different gate driving chips.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Description

一种液晶面板的驱动电路、 液晶面板及液晶显示装置
【技术领域】
本发明涉及显示器领域, 更具体的说, 涉及一种液晶面板的驱动电路、 液 晶面板及液晶显示装置。
【背景技术】
采用 FT-LCD驱动架构的液晶面板, 通常为了降低成本会考虑省略扫描线 驱动的电路板, 因此门极驱动的信号需要从液晶面板内部走线, 输送到扫描线。 如图 1 ~ 2所示,门极驱动( Gate Driver )芯片的输入电压从控制板( Control Board ) 的驱动芯片 (Power IC ) 中产生经由源极驱动电路板(图 1中 X Board所示)送 到门极驱动( Gate Driver )需要在液晶面板内部走线( Wire On Array: 即 WOA ), 走线受液晶面板布局和生产制程限制呈现有一定的电阻值, 这样的走线上流过 电流时会产生电压差。 参见图 3 , STV是帧同步信号, 一个周期代表一个帧 ( frame ), 其中 VGL_P是控制板(Control Board )上产生的 VGL, VGL_C是 液晶面板上到达 GDI或 GD3的 VGL,我们看到 VGL_C在一个帧的上半区被拉 高, 形成明显的电压差,
当这样的电压差较大时,即作用在两颗门极驱动(Gate Driver )芯片的 VGL 电压差异较大会导致液晶面板上半区和下半区画面显示有色差, 画面中间会看 到明显的水平分界, 影响显示品质。
【发明内容】
本发明所要解决的技术问题是提供一种可降低液晶面板色差的液晶面板的 驱动电路、 液晶面板及液晶显示装置。
本发明的目的是通过以下技术方案来实现的:
一种液晶面板的驱动电路, 所述液晶面板的驱动电路包括跟液晶面板的扫 描线耦合的为位于面板一侧的不同的门极驱动芯片输出 N个不同的驱动电压的 补偿单元; 所述数值 N等于液晶面板一侧设有的门极驱动芯片的数量, 其中距 离驱动电压的驱动源越远的门极驱动芯片, 补偿单元输出的驱动电压绝对值越 大, 使得不同门极驱动芯片的输出电压趋向一致。
进一步的, 所述补偿单元包括:
跟外部采样电压耦合的切换模块;
所述切换模块的输出端分别连接有 N组分压电路, 所有分压电路的输出端 连接到所述液晶面板的内部走线, 并通过所述内部走线耦合到所述门极驱动芯 片;
所述切换模块在一帧的时间周期内切换 N次, 将采样电压切换到不同的分 压电路, 形成所述不同的驱动电压。 本技术方案由于采用了切换模块, 可以将 同一采样电压切换到分压电路中, 通过分压电路的分压作用, 输出不同的电压 到门极驱动芯片, 从液晶面板的上部往下部数, 越是靠近液晶面板上半区的, 门极驱动芯片获取的电压的绝对值越高, 反之, 电压绝对值越低; 这样只要分 压电路设计得当,经过 WOA走线的损耗后,抵达每个门极驱动芯片的电压就可 以保持一致, 这样就能有效降低不同显示区域的色差。
进一步的, 所述切换模块的控制端耦合到所述液晶面板的驱动电路的时序 控制电路, 所述时序控制电路识别正在执行扫描作业的门极驱动芯片, 输出控 制信号控制切换模块切换到相应的分压电路。 时序控制电路控制着液晶面板的 扫描线和数据线的输出信号, 因此, 由时序控制电路来提供控制信号, 可以准 确判断门极驱动芯片动作状态, 无须额外设计检测电路, 有利于筒化电路。
进一步的, 所述门极驱动芯片有两个, 所述切换模块包括高电平导通的第 一可控开关和低电平导通的第二可控开关; 所述第一可控开关和第二可控开关 的输入端耦合到所述采样电压; 其输出端分别耦合到不同的分压电路; 其控制 端耦合到所述时序控制电路, 时序控制电路的控制信号在一帧的时间周期内分 别输出一个低电平信号和一个高电平信号。 现有的可控开关分为低电平驱动和 高电平驱动两种, 因此将两种类型的可控开关并联, 只需要一根控制线, 通过 筒单的高、 低电平信号的转换, 就能将采样电压切换到不同的分压电路, 电路 筒单, 可靠性高, 也有利于降低成本。
进一步的, 所述切换模块还包括有比较器, 所述第一可控开关和第二可控 开关的控制端通过比较器耦合到所述控制信号, 所述比较器的基准端耦合有第 一基准电压, 其比较端耦合到所述控制信号。 通过比较器, 控制信号只需要跟 第一基准电压比, 高于它或低于它就对应两种不同的电平输出, 这样除非是控 制信号跟基准电压的大小关系发生转变, 否则即便控制信号有一些波动, 也不 会影响比较器的输出, 可靠性更高。
进一步的, 所述两组分压电路包括第一分压电路和第二分压电路, 所述第 一分压电路和第二分压电路的一端连接有第二基准电压, 另一端连接到所述液 晶面板的内部走线; 所述第一分压电路包括串联设置的第一电阻和第二电阻, 所述切换模块的第一可控开关的输出端耦合到所述第一电阻和第二电阻之间; 所述第二分压电路包括串联设置的第三电阻和第四电阻, 所述切换模块的第二 可控开关的输出端耦合到所述第三电阻和第四电阻之间。 此为一种具体的分压 电路结构, 假设采样电压是 FB, 其中一个分压电路的电阻是 R1和 R2, 第二基 准电压是 VREF, 那么根据节点电流定律 (VREF-FB)/R2要等于 (FB-VGL)/R1 , 推导出 VGL=FB-(VREF-FB)*(R1/R2), 在本技术方案中, 对于不同的分压电路 来说, VREF和 FB都是定值, 因此, 只要每组分压电路的电阻比值不一样, 输 出的 VGL就不一样, 这样通过筒单的电阻变比调整, 就能得到不同的 VGL, 技 术方案筒单, 有利于降低成本。
进一步的, 所述切换模块的控制端耦合到所述液晶面板的驱动电路的时序 控制电路, 所述切换模块包括高电平导通的第一可控开关和低电平导通的第二 可控开关; 其输入端耦合到所述采样电压; 其输出端分别耦合到不同的分压电 路; 所述液晶面板的驱动电路还包括有比较器, 所述比较器的基准端耦合有基 准电压, 其比较端耦合到所述时序控制电路的输出端, 其输出端分别耦合到所 述第一可控开关和第二可控开关的控制端; 所述时序控制电路在一帧的时间周 期内输出一个低电平信号和一个高电平信号, 通过所述比较器控制所述第一可 控开关和第二可控开关交替切换; 所述两组分压电路包括第一分压电路和第二 分压电路, 所述第一分压电路和第二分压电路的一端连接到所述基准电压, 另 一端连接到所述液晶面板的内部走线; 所述第一分压电路包括串联设置的第一 电阻和第二电阻, 所述切换模块的第一可控开关的输出端耦合到所述第一电阻 和第二电阻之间; 所述第二分压电路包括串联设置的第三电阻和第四电阻, 所 述切换模块的第二可控开关的输出端耦合到所述第三电阻和第四电阻之间; 所 述基准电压为 1.25V。 此为一种具体的液晶面板的驱动电路。
一种液晶显示装置, 包括上述的一种液晶面板的驱动电路。
一种液晶面板的驱动方法, 包括步骤 A: 为位于面板一侧的不同的门极驱 动芯片输出 N个不同的驱动电压, 所述数值 N等于液晶面板一侧设有的门极驱 动芯片的数量, 其中距离驱动电压的驱动源越远的门极驱动芯片, 输出的驱动 电压绝对值越大。
进一步的, 所述步骤 A中, 通过切换模块将外部的采样电压切换到 N组分 压电路,由 N组分压电路输出 N个不同的驱动电压耦合到不同的门极驱动芯片。
经研究发现, 液晶面板色差是由于距离驱动电压的驱动源越远的门极驱动 芯片, 连接的走线越长, 相应的, 驱动电压恒定的前提下, 其压降下降越厉害, 因此, 本发明通过增加补偿单元, 可以输出 N组不同的驱动电压, 跟液晶面板 一侧的 N个门极驱动芯片——对应, 巨离驱动电压的驱动源越远, 对应的驱动 电压的绝对值越大, 这样就能部分甚至于全部抵消走线的压降, 使得每个门极 驱动芯片的输出电压趋向一致, 达到了降低液晶面板色差的目的。
【附图说明】
图 1是现有的一种液晶面板原理示意图;
图 2是图 1中驱动芯片的原理示意图;
图 3是图 1所述液晶面板驱动波形示意图; 图 4是本发明实施例的原理示意图;
图 5是本发明实施例的驱动波形示意图。
【具体实施方式】
本发明公开了一种液晶显示装置, 液晶显示装置包括一种液晶面板的驱动 电路, 该液晶面板的驱动电路包括跟液晶面板的扫描线耦合的为位于面板一侧 的不同的门极驱动芯片输出 N个不同的驱动电压的补偿单元; 所述数值 N等于 液晶面板一侧设有的门极驱动芯片的数量, 其中距离驱动电压的驱动源越远的 门极驱动芯片, 补偿单元输出的驱动电压绝对值越大, 使得不同门极驱动芯片 的输出电压趋向一致。
发明人研究发现, 由于距离驱动电压的驱动源越远的门极驱动芯片, 连接 的走线越长, 相应的, 驱动电压恒定的前提下, 其压降下降越厉害, 因此, 本 发明通过增加补偿单元, 可以输出 N组不同的驱动电压, 跟液晶面板一侧的 N 个门极驱动芯片——对应, 巨离驱动电压的驱动源越远, 对应的驱动电压的绝 对值越大, 这样就能部分甚至于全部抵消走线的压降, 使得每个门极驱动芯片 的输出电压趋向一致, 达到了降低液晶面板色差的目的。
下面以 N=2为例, 结合附图和较佳的实施例对本发明作进一步说明。
本实施方式中的液晶显示装置包括液晶面板, 液晶面板的两侧各设有两个 门极驱动芯片, 液晶面板的上部设有多个源极驱动芯片, 源极驱动芯片通过源 极驱动电路板来控制, 整个液晶面板的驱动通过控制电路板来实现, 控制电路 板上设置驱动芯片和时序控制电路, 当然, 时序控制电路也可以集成到驱动芯 片内; 本发明的切换模块设置在控制电路板上, 也可以集成到驱动芯片内。
参见图 4, 切换模块的控制端耦合到时序控制电路 T-con, 时序控制电路输 出一个控制信号 FBSW, 控制信号 FBSW在一帧的时间周期输出一个低电平信 号和一个高电平信号, 控制切换模块进行切换。 时序控制电路控制着液晶面板 的扫描线和数据线的输出信号, 因此, 由时序控制电路来提供控制信号, 可以 准确判断门极驱动芯片动作状态, 无须额外设计检测电路, 有利于筒化电路。 切换模块包括高电平导通的第一可控开关 Q1 和低电平导通的第二可控开 关 Q2; 其输入端耦合到采样电压 FB; 其输出端分别耦合到第一分压电路和第 二分压电路; 其控制端通过比较器 CF耦合到时序控制电路 T-con。 比较器 CF 的基准端耦合到第一基准电压, 其比较端耦合到时序控制电路的控制信号 FBSW, 其输出端分别耦合到所述第一可控开关 Q1和第二可控开关 Q2的控制 端。 通过比较器, 控制信号只需要跟第一基准电压比, 高于它或低于它就对应 两种不同的电平输出, 这样除非是控制信号跟基准电压的大小关系发生转变, 否则即便控制信号有一些波动, 也不会影响比较器的输出, 可靠性更高。
本实施例的两组分压电路包括第一分压电路和第二分压电路, 第一分压电 路和第二分压电路的一端连接到第二基准电压 VREF,另一端连接到液晶面板的 内部走线; 第一分压电路包括串联设置的第一电阻 R1和第二电阻 R2, 切换模 块的第一可控开关 Q1的输出端耦合到第一电阻 R1和第二电阻 R2之间; 第二 分压电路包括串联设置的第三电阻 R3和第四电阻 R4, 切换模块的第二可控开 关 Q2的输出端耦合到第三电阻 R3和第四电阻 R4之间。采样电压 FB通过第一 分压电路通过第一电阻 R1和第二电阻 R2的分压、 采样, 得到电压 FBI; 第二 分压电路通过第三电阻 R3和第四电阻 R4的分压、 采样, 得到电压 FB2。 为了 筒化设计, 第二基准电压 VREF和第一基准电压可以保持一致, 如图中所示的 1.25V, 该电压可以方便地从现有的电路中获取, 无须增加电路的复杂性。
如图 5所示, 当 FBSW为低电平 L时, 比较器输出为高电平 H, 这时第二 可控开关 Q2导通, 切换模块将采样电压 FB 切换到第二分压电路, 输出电压 FB2, 把控制电路板上产生的 VGL 的电压定义为 VGL_P'; 此时 VGL_P, = FB-(VREF-FB)*(R3/R4); 当 FBSW为 H时, 比较器输出为 L, 这时第一可控开 关 Q1导通, 切换模块将采样电压 FB切换到第一分压电路, 输出电压 FBI , 此 时 VGL_P, = FB-(VREF-FB)*(R1/R2); 只要测算出液晶面板内部走线造成的压 降,根据该压降计算出需要的 R3/R4和 R1/R2的比值,两个不同压降的 VGL_P, 经过液晶面板内部走线后到达门极驱动芯片 GDI或 GD3的电压 VGL_C, 就能 GD2或 GD4的电压 VGL_C, 一致, 形成稳定的电压。
现有的可控开关分为低电平驱动和高电平驱动两种, 因此将两种类型的可 控开关并联, 只需要一根控制线, 通过筒单的高、 低电平信号的转换, 就能将 采样电压切换到不同的分压电路, 电路筒单, 可靠性高, 也有利于降低成本。 但是, 本发明不局限于 N=2的技术方案, 当 N>=3的时候, 就不能筒单的用可 控开关来切换, 此时可以采用多路选通芯片, 多路选通芯片可以有多个输出引 脚, 每个引脚可以耦合到一组分压电路, 然后通过数字信号来控制多个输出引 脚之间的切换。
本发明还公开一种液晶面板的驱动方法, 包括步骤 A: 为位于面板一侧的 不同的门极驱动芯片输出 N个不同的驱动电压, 所述数值 N等于液晶面板一侧 设有的门极驱动芯片的数量, 其中距离驱动电压的驱动源越远的门极驱动芯片, 输出的驱动电压绝对值越大。
进一步的, 所述步骤 A中, 通过切换模块将外部的采样电压切换到 N组分 压电路,由 N组分压电路输出 N个不同的驱动电压耦合到不同的门极驱动芯片。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明, 上 述实施方式通过不同的分压电路, 将同一电压转换成不同的驱动电压, 当然还 可以利用一个电压源直接输出不同的电压作为驱动电压, 不能认定本发明的具 体实施只局限于这些说明。 对于本发明所属技术领域的普通技术人员来说, 在 不脱离本发明构思的前提下, 还可以做出若干筒单推演或替换, 都应当视为属 于本发明的保护范围。

Claims

权利要求
1、 一种液晶面板的驱动电路, 所述液晶面板的驱动电路包括跟液晶面板的 扫描线耦合的为位于面板一侧的不同的门极驱动芯片输出 N个不同的驱动电压 的补偿单元; 所述数值 N等于液晶面板一侧设有的门极驱动芯片的数量, 其中 距离驱动电压的驱动源越远的门极驱动芯片, 补偿单元输出的驱动电压绝对值 越大。
2、 如权利要求 1所述的一种液晶面板的驱动电路, 其中, 所述补偿单元包 括:
跟外部采样电压耦合的切换模块;
所述切换模块的输出端分别连接有 N组分压电路, 所有分压电路的输出端 连接到所述液晶面板的内部走线, 并通过所述内部走线耦合到所述门极驱动芯 片;
所述切换模块在一帧的时间周期内切换 N次, 将采样电压切换到不同的分 压电路, 形成所述不同的驱动电压。
3、 如权利要求 2所述的一种液晶面板的驱动电路, 其中, 所述切换模块的 控制端耦合到所述液晶面板的驱动电路的时序控制电路, 所述时序控制电路识 别正在执行扫描作业的门极驱动芯片, 输出控制信号控制切换模块切换到相应 的分压电路。
4、 如权利要求 3所述的一种液晶面板的驱动电路, 其中, 所述门极驱动芯 片有两个, 所述切换模块包括高电平导通的第一可控开关和低电平导通的第二 可控开关; 所述第一可控开关和第二可控开关的输入端耦合到所述采样电压; 其输出端分别耦合到不同的分压电路; 其控制端耦合到所述时序控制电路, 时 序控制电路的控制信号在一帧的时间周期内分别输出一个低电平信号和一个高 电平信号。
5、 如权利要求 4所述的一种液晶面板的驱动电路, 其中, 所述切换模块 还包括有比较器, 所述第一可控开关和第二可控开关的控制端通过比较器耦合 到所述时序控制电路的控制信号, 所述比较器的基准端耦合有第一基准电压, 其比较端耦合到所述时序控制电路的控制信号。
6、 如权利要求 4或 5所述的一种液晶面板的驱动电路, 其中, 所述两组分 压电路包括第一分压电路和第二分压电路, 所述第一分压电路和第二分压电路 的一端连接有第二基准电压, 另一端连接到所述液晶面板的内部走线; 所述第 一分压电路包括串联设置的第一电阻和第二电阻, 所述切换模块的第一可控开 关的输出端耦合到所述第一电阻和第二电阻之间; 所述第二分压电路包括串联 设置的第三电阻和第四电阻, 所述切换模块的第二可控开关的输出端耦合到所 述第三电阻和第四电阻之间。
7、 如权利要求 2所述的一种液晶面板的驱动电路, 其中, 所述切换模块的 控制端耦合到所述液晶面板的驱动电路的时序控制电路, 所述切换模块包括高 电平导通的第一可控开关和低电平导通的第二可控开关; 其输入端耦合到所述 采样电压; 其输出端分别耦合到不同的分压电路; 所述液晶面板的驱动电路还 包括有比较器, 所述比较器的基准端耦合有基准电压, 其比较端耦合到所述时 序控制电路的输出端, 其输出端分别耦合到所述第一可控开关和第二可控开关 的控制端; 所述时序控制电路在一帧的时间周期内输出一个低电平信号和一个 高电平信号, 通过所述比较器控制所述第一可控开关和第二可控开关交替切换; 所述两组分压电路包括第一分压电路和第二分压电路, 所述第一分压电路和第 二分压电路的一端连接到所述基准电压, 另一端连接到所述液晶面板的内部走 线; 所述第一分压电路包括串联设置的第一电阻和第二电阻, 所述切换模块的 第一可控开关的输出端耦合到所述第一电阻和第二电阻之间; 所述第二分压电 路包括串联设置的第三电阻和第四电阻, 所述切换模块的第二可控开关的输出 端耦合到所述第三电阻和第四电阻之间; 所述基准电压为 1.25V。
8、 一种液晶显示装置, 包括一种液晶面板的驱动电路, 所述液晶面板的驱 动电路包括跟液晶面板的扫描线耦合的为位于面板一侧的不同的门极驱动芯片 输出 N个不同的驱动电压的补偿单元; 所述数值 N等于液晶面板一侧设有的门 极驱动芯片的数量, 其中距离驱动电压的驱动源越远的门极驱动芯片, 补偿单 元输出的驱动电压绝对值越大。
9、 如权利要求 8所述的一种液晶显示装置, 其中, 所述补偿单元包括: 跟外部采样电压耦合的切换模块;
所述切换模块的输出端分别连接有 N组分压电路, 所有分压电路的输出端 连接到所述液晶面板的内部走线, 并通过所述内部走线耦合到所述门极驱动芯 片;
所述切换模块在一帧的时间周期内切换 N次, 将采样电压切换到不同的分 压电路, 形成所述不同的驱动电压。
10、 如权利要求 9所述的一种液晶显示装置, 其中, 所述切换模块的控制 端耦合到所述液晶面板的驱动电路的时序控制电路, 所述时序控制电路识别正 在执行扫描作业的门极驱动芯片, 输出控制信号控制切换模块切换到相应的分 压电路。
11、 如权利要求 10所述的一种液晶显示装置, 其中, 所述门极驱动芯片有 两个, 所述切换模块包括高电平导通的第一可控开关和低电平导通的第二可控 开关; 所述第一可控开关和第二可控开关的输入端耦合到所述采样电压; 其输 出端分别耦合到不同的分压电路; 其控制端耦合到所述时序控制电路, 时序控 制电路的控制信号在一帧的时间周期内分别输出一个低电平信号和一个高电平 信号。
12、 如权利要求 11 所述的一种液晶显示装置, 其中, 所述切换模块还包 括有比较器, 所述第一可控开关和第二可控开关的控制端通过比较器耦合到所 述时序控制电路的控制信号, 所述比较器的基准端耦合有第一基准电压, 其比 较端耦合到所述时序控制电路的控制信号。
13、 如权利要求 11或 12所述的一种液晶显示装置, 其中, 所述两组分压 电路包括第一分压电路和第二分压电路, 所述第一分压电路和第二分压电路的 一端连接有第二基准电压, 另一端连接到所述液晶面板的内部走线; 所述第一 分压电路包括串联设置的第一电阻和第二电阻, 所述切换模块的第一可控开关 的输出端耦合到所述第一电阻和第二电阻之间; 所述第二分压电路包括串联设 置的第三电阻和第四电阻, 所述切换模块的第二可控开关的输出端耦合到所述 第三电阻和第四电阻之间。
14、 如权利要求 9所述的一种液晶显示装置, 其中, 所述切换模块的控制 端耦合到所述液晶面板的驱动电路的时序控制电路, 所述切换模块包括高电平 导通的第一可控开关和低电平导通的第二可控开关; 其输入端耦合到所述采样 电压; 其输出端分别耦合到不同的分压电路; 所述液晶面板的驱动电路还包括 有比较器, 所述比较器的基准端耦合有基准电压, 其比较端耦合到所述时序控 制电路的输出端, 其输出端分别耦合到所述第一可控开关和第二可控开关的控 制端; 所述时序控制电路在一帧的时间周期内输出一个低电平信号和一个高电 平信号, 通过所述比较器控制所述第一可控开关和第二可控开关交替切换; 所 述两组分压电路包括第一分压电路和第二分压电路, 所述第一分压电路和第二 分压电路的一端连接到所述基准电压, 另一端连接到所述液晶面板的内部走线; 所述第一分压电路包括串联设置的第一电阻和第二电阻, 所述切换模块的第一 可控开关的输出端耦合到所述第一电阻和第二电阻之间; 所述第二分压电路包 括串联设置的第三电阻和第四电阻, 所述切换模块的第二可控开关的输出端耦 合到所述第三电阻和第四电阻之间; 所述基准电压为 1.25V。
15、 一种液晶面板的驱动方法, 包括步骤 A: 为位于面板一侧的不同的门 极驱动芯片输出 N个不同的驱动电压, 所述数值 N等于液晶面板一侧设有的门 极驱动芯片的数量, 其中距离驱动电压的驱动源越远的门极驱动芯片, 输出的 驱动电压绝对值越大。
16、如权利要求 15所述的一种液晶面板的驱动方法,其中,所述步骤 A中, 通过切换模块将外部的采样电压切换到 N组分压电路, 由 N组分压电路输出 N 个不同的驱动电压耦合到不同的门极驱动芯片。
PCT/CN2012/084086 2012-09-29 2012-11-05 一种液晶面板的驱动电路、液晶面板及液晶显示装置 Ceased WO2014048006A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/703,899 US9013385B2 (en) 2012-09-29 2012-11-05 Driving circuit of LCD panel, LCD panel, and LCD device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210379436.7 2012-09-29
CN201210379436.7A CN102855862B (zh) 2012-09-29 2012-09-29 一种液晶面板的驱动电路、液晶面板及液晶显示装置

Publications (1)

Publication Number Publication Date
WO2014048006A1 true WO2014048006A1 (zh) 2014-04-03

Family

ID=47402392

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/084086 Ceased WO2014048006A1 (zh) 2012-09-29 2012-11-05 一种液晶面板的驱动电路、液晶面板及液晶显示装置

Country Status (2)

Country Link
CN (1) CN102855862B (zh)
WO (1) WO2014048006A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118732350A (zh) * 2024-09-03 2024-10-01 惠科股份有限公司 显示面板及其驱动方法、显示装置

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103117050B (zh) * 2013-02-05 2016-06-08 深圳市华星光电技术有限公司 用于液晶显示器的补偿电路及液晶显示器
CN104077988B (zh) 2014-06-18 2016-09-21 京东方科技集团股份有限公司 驱动信号产生电路、方法和 3d 显示装置
CN105575352A (zh) * 2016-03-02 2016-05-11 京东方科技集团股份有限公司 栅极驱动方法及电路、显示装置
CN105589235B (zh) * 2016-03-11 2018-11-20 深圳市华星光电技术有限公司 液晶显示面板驱动方法
CN105590609B (zh) * 2016-03-11 2019-01-22 深圳市华星光电技术有限公司 液晶显示面板驱动方法及液晶显示面板驱动系统
CN107293267B (zh) * 2017-07-19 2020-05-05 深圳市华星光电半导体显示技术有限公司 一种显示面板及显示面板栅极信号的控制方法
CN107731190B (zh) * 2017-11-14 2020-01-31 深圳市华星光电半导体显示技术有限公司 液晶显示装置的驱动系统及驱动方法
TWI703541B (zh) * 2018-03-08 2020-09-01 瑞鼎科技股份有限公司 源極驅動模組、顯示裝置以及顯示面板驅動方法
CN109164862A (zh) 2018-07-24 2019-01-08 惠科股份有限公司 一种基准电压产生系统和产生方法
US11074879B2 (en) 2018-09-30 2021-07-27 HKC Corporation Limited Drive circuit of display device, display device and display panel
CN109166547B (zh) * 2018-09-30 2020-10-27 惠科股份有限公司 显示装置的驱动电路、显示装置和显示面板
CN109166552A (zh) * 2018-10-17 2019-01-08 深圳市华星光电半导体显示技术有限公司 液晶显示面板及其驱动电路

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7038675B2 (en) * 2001-09-27 2006-05-02 Hitachi, Ltd. Liquid crystal display device and manufacturing method thereof
CN1835061A (zh) * 2005-03-15 2006-09-20 中华映管股份有限公司 液晶显示装置及其驱动电路与相关方法
CN1904678A (zh) * 2005-07-26 2007-01-31 三星电子株式会社 液晶显示器及其方法
US7830371B2 (en) * 2002-10-14 2010-11-09 Lg Display Co., Ltd. Liquid crystal display device and driving method thereof
CN102214432A (zh) * 2010-12-10 2011-10-12 友达光电股份有限公司 电源管理与控制模块以及液晶显示器
CN102682693A (zh) * 2012-06-05 2012-09-19 深圳市华星光电技术有限公司 显示面板及其驱动方法
CN102682694A (zh) * 2012-06-05 2012-09-19 深圳市华星光电技术有限公司 显示面板、平板显示装置及其驱动方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0519719A (ja) * 1991-07-09 1993-01-29 Fujitsu Ltd 液晶表示装置の駆動制御回路
CN101620832B (zh) * 2008-06-30 2011-07-13 中华映管股份有限公司 液晶显示器及其开关电压控制电路
CN101369061A (zh) * 2008-10-15 2009-02-18 上海广电光电子有限公司 液晶显示面板的驱动方法
CN101593496B (zh) * 2009-06-26 2013-08-14 友达光电股份有限公司 栅极输出控制方法
CN101699552B (zh) * 2009-11-16 2012-04-18 友达光电股份有限公司 栅极输出控制方法及相应的栅极脉冲调制器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7038675B2 (en) * 2001-09-27 2006-05-02 Hitachi, Ltd. Liquid crystal display device and manufacturing method thereof
US7830371B2 (en) * 2002-10-14 2010-11-09 Lg Display Co., Ltd. Liquid crystal display device and driving method thereof
CN1835061A (zh) * 2005-03-15 2006-09-20 中华映管股份有限公司 液晶显示装置及其驱动电路与相关方法
CN1904678A (zh) * 2005-07-26 2007-01-31 三星电子株式会社 液晶显示器及其方法
CN102214432A (zh) * 2010-12-10 2011-10-12 友达光电股份有限公司 电源管理与控制模块以及液晶显示器
CN102682693A (zh) * 2012-06-05 2012-09-19 深圳市华星光电技术有限公司 显示面板及其驱动方法
CN102682694A (zh) * 2012-06-05 2012-09-19 深圳市华星光电技术有限公司 显示面板、平板显示装置及其驱动方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118732350A (zh) * 2024-09-03 2024-10-01 惠科股份有限公司 显示面板及其驱动方法、显示装置

Also Published As

Publication number Publication date
CN102855862B (zh) 2014-07-30
CN102855862A (zh) 2013-01-02

Similar Documents

Publication Publication Date Title
WO2014048006A1 (zh) 一种液晶面板的驱动电路、液晶面板及液晶显示装置
CN105321479B (zh) 源极驱动器、显示驱动电路及显示装置
KR100843148B1 (ko) 액정 표시 장치, 액정 표시 장치의 테스트용 커넥터 및이의 테스트 방법
CN102568413B (zh) 液晶显示设备及其驱动方法
KR101876561B1 (ko) 액정표시장치와 이의 구동방법
KR100613325B1 (ko) 구동 장치 및 표시 모듈
TWI404310B (zh) 電源管理與控制模組以及液晶顯示器
EP1304791A1 (en) Source voltage conversion circuit and its control method, display, and portable terminal
US20120019502A1 (en) Source driver for a liquid crystal display device and liquid crystal display device using the same
WO2020103193A1 (zh) 驱动电路和显示面板
KR101209043B1 (ko) 표시 장치의 구동 장치 및 이를 포함하는 표시 장치
KR101347165B1 (ko) 액정표시장치
US20160078835A1 (en) Display driving circuit and display device
CN116994536A (zh) 公共电压补偿电路、补偿方法与显示设备
KR20110133201A (ko) Led 구동회로 및 이의 구동 방법
CN115862561B (zh) 信号传输方法、装置、源驱动器和电子设备
US8248399B2 (en) Driving-voltage generation apparatus and liquid crystal display having the same
US11862058B2 (en) Load driving circuit, display driver, display apparatus and semiconductor device
US9013385B2 (en) Driving circuit of LCD panel, LCD panel, and LCD device
KR20110122615A (ko) 표시 장치 및 그 구동 방법
KR20080010551A (ko) 표시 장치의 구동 장치 및 이를 포함하는 표시 장치
KR20160083577A (ko) 표시장치
CN107978278A (zh) 扫描电路、有机发光显示装置及其驱动方法
CN110310608B (zh) 液晶显示面板的控制电路、测试设备和测试方法
CN116072082B (zh) 应用于胆固醇液晶显示装置的显示驱动电路

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 13703899

Country of ref document: US

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12885707

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12885707

Country of ref document: EP

Kind code of ref document: A1