WO2017206630A1 - 面板驱动装置以及显示装置 - Google Patents

面板驱动装置以及显示装置 Download PDF

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Publication number
WO2017206630A1
WO2017206630A1 PCT/CN2017/081872 CN2017081872W WO2017206630A1 WO 2017206630 A1 WO2017206630 A1 WO 2017206630A1 CN 2017081872 W CN2017081872 W CN 2017081872W WO 2017206630 A1 WO2017206630 A1 WO 2017206630A1
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WIPO (PCT)
Prior art keywords
voltage
resistor
output
voltage signal
differential amplifier
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/CN2017/081872
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English (en)
French (fr)
Inventor
张言萍
马韬
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.)
BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Application filed by BOE Technology Group Co Ltd, Hefei Xinsheng Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US15/566,035 priority Critical patent/US10319285B2/en
Publication of WO2017206630A1 publication Critical patent/WO2017206630A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G3/2096—Details of the interface to the display terminal specific for a flat panel
    • 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
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • 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

Definitions

  • Exemplary embodiments of the present invention relate to the field of display technologies, and more particularly, to a panel driving device and a display device.
  • Existing TFT-LCD display devices typically include a panel drive device, and the panel drive device includes an interface module and a voltage conversion module.
  • the interface module receives the first voltage from the power module and outputs the second voltage, and then supplies the second voltage to the voltage conversion module through the trace of the printed circuit board. Due to the voltage loss on the transmission cable in the interface module, the second voltage output by the interface module is typically lower than the first voltage received by the interface module. Due to the voltage loss on the traces of the printed circuit board, the third voltage actually received by the voltage conversion module is typically lower than the second voltage output by the interface module. Accordingly, the third voltage actually received by the voltage conversion module is typically lower than the first voltage received by the interface module.
  • the third voltage received by the voltage conversion module is low, which may cause the voltage conversion module to operate abnormally or the output voltage of the voltage conversion module is abnormal, thereby causing the TFT-LCD display device to operate abnormally.
  • This phenomenon is especially serious when the load of the panel driving device is large.
  • An exemplary embodiment of the present invention provides a panel driving device and a display device capable of compensating for voltage loss on a transmission cable and voltage loss on a trace of a printed circuit board, such that The third voltage signal received at the input of the voltage conversion module is equal to the first voltage signal received at the input of the interface module, so that the abnormal operation of the liquid crystal panel can be avoided.
  • a panel driving apparatus including an interface module, a voltage conversion module, and a compensation module.
  • the interface module includes a first input and a first output.
  • the voltage conversion module includes a second input and a second output. The first output is coupled to the second input.
  • the voltage at the first input is a first voltage
  • the voltage at the first output is a second voltage
  • the voltage at the second input is a third voltage signal
  • the voltage is the fourth voltage signal.
  • the compensation module is configured to generate a compensation voltage signal based on the third voltage signal and apply the compensation voltage signal to the first input or the first output such that the third voltage signal is The first voltage signals are equal.
  • the compensation module includes a first resistor, a differential amplifying circuit, and a converting unit.
  • the first end of the first resistor receives the third voltage signal, the second end of the first resistor is grounded, and the two input ends of the differential amplifier circuit are respectively coupled to the two ends of the first resistor, An output end of the differential amplifying circuit is coupled to the converting unit.
  • the compensation module includes a first resistor, a second resistor, a differential amplifying circuit, and a converting unit.
  • the first end of the first resistor receives the third voltage signal
  • the second end of the first resistor is grounded through a second resistor
  • the two input ends of the differential amplifying circuit are respectively coupled to the first resistor
  • the output ends of the differential amplifying circuit are coupled to the converting unit.
  • the differential amplifying circuit includes a differential amplifier, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor.
  • One end of the third resistor is coupled to the first end of the first resistor, and the other end of the third resistor is coupled to the first input end of the differential amplifier, and one end of the fourth resistor is coupled to the first end a second end of the first resistor, the other end of the fourth resistor is coupled to the second input end of the differential amplifier, one end of the fifth resistor is grounded, and the other end of the fifth resistor is coupled to the difference
  • the first input end of the amplifier, one end of the sixth resistor is coupled to the second input end of the differential amplifier, and the other end of the sixth resistor is coupled to the output end of the differential amplifier.
  • the fifth resistor A ratio of the third resistor to the third resistor is equal to a ratio of the sixth resistor to the fourth resistor.
  • the conversion unit is configured to multiply a difference between a reference voltage of an output voltage of the differential amplifier and an output voltage of the differential amplifier by a preset coefficient to obtain the compensation The value of the voltage signal.
  • the panel driving apparatus further includes a timing controller configured to receive a first control signal from the interface module, receive the fourth voltage signal from the voltage conversion module, and The second control signal is output.
  • the panel driving device further includes a gate driving circuit configured to receive a second control signal from the timing controller and output a gate driving signal.
  • the panel driving apparatus further includes a gamma circuit configured to receive the fourth voltage signal from the voltage conversion module, receive a data signal from the interface module, and output a gamma Horse voltage.
  • the panel driving device further includes a source driving circuit configured to receive the fourth voltage from the voltage conversion module, receive a gamma voltage from the gamma circuit, and Output source drive signal.
  • a display device comprising the panel driving device of any of the above.
  • FIG. 1 is a block diagram showing the structure of a panel driving device according to a first embodiment of the present invention
  • FIG. 2 is a circuit diagram of a compensation module in accordance with an embodiment of the present invention.
  • FIG. 3 is a circuit diagram of a compensation module in accordance with another embodiment of the present invention.
  • Figure 4 is a block diagram showing the structure of a panel driving device according to a second embodiment of the present invention.
  • Figure 5 is a block diagram showing the structure of a panel driving device according to a third embodiment of the present invention.
  • Figure 6 is a block diagram showing the structure of a panel driving apparatus according to a fourth embodiment of the present invention.
  • Fig. 1 is a block diagram showing the structure of a panel driving device 10 according to a first embodiment of the present invention.
  • the panel driving device 10 may include an interface module 11, a voltage conversion module 12, and a compensation module 13.
  • the interface module 11 can receive the first voltage signal V1 from the power module at its input end and output the second voltage signal V2 from its output terminal to the voltage conversion module 12, due to cable transmission loss in the interface module 11,
  • the second voltage signal V2 is typically lower than the first voltage signal V1.
  • the voltage conversion module 12 can receive the second voltage signal V2 from the interface module 11 through the traces of the printed circuit board. Due to the trace loss of the printed circuit board, the voltage signal received at the input of the voltage conversion module 12 is the third voltage signal V3.
  • the third voltage signal V3 is typically lower than the second voltage signal V2.
  • the third voltage signal V3 is also lower than the first voltage signal V1.
  • the voltage conversion module 12 is configured to convert the third voltage signal V3 into a fourth voltage signal V4 through a boost circuit or a buck circuit.
  • the compensation module 13 can generate the compensation voltage signal Vc according to the third voltage signal V3, and input the compensation voltage signal Vc to the input end of the interface module 11 such that the third voltage signal V3 is equal to the first voltage signal V1.
  • the panel driving device 10 of the embodiment of the invention can compensate for the cable transmission loss and the loss on the trace of the printed circuit board, so that the third voltage signal V3 received by the voltage conversion module 12 is equal to the first voltage signal V1, so that the liquid crystal can be avoided.
  • the panel works abnormally.
  • the compensation voltage signal Vc is correspondingly generated to perform the input terminal of the interface module 11. make up.
  • FIG. 2 shows a circuit diagram of a compensation module in accordance with one embodiment of the present invention.
  • the compensation module 13 may include a first resistor R1, a differential amplifying circuit 131, and a converting unit 132.
  • the first end of the first resistor R1 receives the third voltage signal V3, and the second end of the first resistor R1 is grounded through the second resistor R2.
  • the two input ends of the differential amplifying circuit 131 are respectively coupled to both ends of the first resistor R1.
  • the output of the differential amplifier circuit 131 is coupled to the conversion unit 132, which outputs an output voltage Vo based on the voltage difference across the first resistor R1, that is, the output voltage Vo is a multiple of V3*R1/(R1+R2).
  • the differential amplifying circuit 131 includes a differential amplifier AMP, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
  • the first end of the third resistor R3 is coupled to the first end of the first resistor R1, and the other end of the third resistor R3 is coupled to the first input end of the differential amplifier AMP.
  • One end of the fourth resistor R4 is coupled to the second end of the first resistor R1, and the other end of the fourth resistor R4 is coupled to the second input end of the differential amplifier AMP.
  • One end of the fifth resistor R5 is grounded, and the other end of the fifth resistor R5 is coupled to the first input end of the differential amplifier AMP.
  • One end of the sixth resistor R6 is coupled to the second input end of the differential amplifier AMP, and the other end of the sixth resistor R6 is coupled to the output end of the differential amplifier AMP.
  • the first input of the differential amplifier AMP is the non-inverting input (+) of the differential amplifier AMP
  • the second input of the differential amplifier AMP is the inverting input (-) of the differential amplifier AMP.
  • the first input of the differential amplifier AMP may also be an inverting input (-) of the differential amplifier AMP
  • the second input of the differential amplifier AMP may also be a differential The non-inverting input (+) of the amplifier AMP.
  • the output voltage Vo of the differential amplifier according to the equation (1) is three times the third voltage V3.
  • the reference voltage of the third voltage V3 is set to 3.3V
  • the reference voltage of the output voltage Vo of the differential amplifier is 9.9V
  • the actual output voltage of the differential amplifier is 3*3.1V, that is, the actual output voltage of the differential amplifier is 9.3.
  • the value of the compensation voltage signal Vc can be set by the conversion unit 132 to be the difference between the reference voltage of the output voltage of the differential amplifier and the output voltage Vo of the differential amplifier multiplied by the preset first coefficient k1, that is, the compensation voltage signal.
  • the first coefficient k1 can be set to 1/3, and at this time, the compensation voltage signal Vc is 0.2V.
  • the compensation voltage signal Vc By inputting the compensation voltage signal Vc to the input terminal of the interface module 11, the sum of the compensation voltage signal Vc and the first voltage signal V1 can be applied to the input of the input interface module 11, so that the voltage at the input of the interface module 11 is 3.5V.
  • the second voltage signal V2 at the output of the interface module 11 is 3.4V
  • the third voltage signal V3 at the input of the voltage conversion module 12 is 3.3V, which is the first voltage.
  • Signal V1 is equal.
  • FIG. 3 shows a circuit diagram of a compensation module in accordance with another embodiment of the present invention.
  • the embodiment of the compensation module 13 in FIG. 3 can be regarded as a special case of the compensation module 13 when the second resistance value in FIG. 2 is zero.
  • the output voltage Vo of the differential amplifier according to the equation (2) is six times the third voltage V3.
  • the reference voltage of the third voltage V3 is set to 3.3V
  • the actual output voltage of the differential amplifier is 6*3.1V, that is, the differential amplifier The actual output voltage is 18.6V.
  • the value of the compensation voltage signal Vc can be set by the conversion unit 132 to be the difference between the reference voltage of the output voltage of the differential amplifier and the output voltage Vo of the differential amplifier multiplied by the preset second coefficient k2, that is, the compensation voltage signal.
  • the second coefficient k2 can be set to 1/6, and at this time, the compensation voltage signal Vc is 0.2V.
  • the compensation voltage signal Vc By inputting the compensation voltage signal Vc to the input terminal of the interface module 11, the sum of the compensation voltage signal Vc and the first voltage signal V1 can be applied to the input of the input interface module 11, so that the voltage at the input of the interface module 11 is 3.5V.
  • the second voltage signal V2 at the output of the interface module 11 is 3.4V
  • the third voltage signal V3 at the input of the voltage conversion module 12 is 3.3V, which is the first voltage.
  • Signal V1 is equal.
  • Fig. 4 is a block diagram showing the structure of a panel driving device according to a second embodiment of the present invention.
  • the panel driving device 20 includes an interface module 11, a voltage conversion module 12, and a compensation module 13.
  • the compensation voltage signal Vc generated by the compensation module 13 is applied to the output of the interface module 11 in FIG. 4 such that the third voltage signal V3 is equal to the first voltage signal V1.
  • the panel driving device 20 can compensate for cable transmission loss and loss on the trace of the printed circuit board, so that the voltage conversion module 12 receiving the third voltage signal V3 and the first voltage The signals V1 are equal, so that the operation of the liquid crystal panel can be prevented from being abnormal.
  • the reference voltage of the third voltage V3 is set to 3.3V
  • the reference voltage of the output voltage Vo of the differential amplifier is 9.9V
  • the actual output voltage of the differential amplifier is 3*3.1V, that is, the actual output voltage of the differential amplifier is 9.3. V.
  • the value of the compensation voltage signal Vc can be set by the conversion unit 132 to be the difference between the reference voltage of the output voltage of the differential amplifier and the output voltage Vo of the differential amplifier multiplied by the preset third coefficient k3, that is, the compensation voltage signal.
  • the third coefficient k3 can be set to 1/3, and at this time, the compensation voltage signal Vc is 0.2V.
  • the compensation voltage signal Vc By applying the compensation voltage signal Vc to the output of the interface module 11, the sum of the compensation voltage signal Vc and the second voltage signal V2 can be applied to the output of the input interface module 11 such that the voltage at the output of the interface module 11 It is 3.4V.
  • the third voltage signal V3 at the input of the voltage conversion module 12 is 3.3V, which is equal to the first voltage signal V1.
  • the reference voltage of the third voltage V3 is set to 3.3V
  • the reference voltage of the output voltage Vo of the differential amplifier is 19.8V
  • the actual output voltage of the differential amplifier is 6*3.1V, that is, the actual output voltage of the differential amplifier is 18.6. V.
  • the value of the compensation voltage signal Vc may be set by the conversion unit 132 to be the difference between the reference voltage of the output voltage of the differential amplifier and the output voltage Vo of the differential amplifier multiplied by the preset fourth coefficient k4, that is, the compensation voltage signal.
  • the fourth coefficient k4 can be set to 1/6, and at this time, the compensation voltage signal Vc is 0.2V.
  • the compensation voltage signal Vc By applying the compensation voltage signal Vc to the output of the interface module 11, the sum of the compensation voltage signal Vc and the second voltage signal V2 can be applied to the output of the input interface module 11 such that the voltage at the output of the interface module 11 It is 3.4V.
  • the third voltage signal V3 at the input of the voltage conversion module 12 is 3.3V, which is equal to the first voltage signal V1.
  • Fig. 5 is a block diagram showing the structure of a panel driving apparatus according to a third embodiment of the present invention.
  • the panel driving device 30 in FIG. 5 may further include a timing controller 14 and a gamma circuit 15.
  • the timing controller 14 may receive the first control signal Sc1 from the interface module 11, receive the fourth voltage signal V4 from the voltage conversion module 12, and output the second control signal Sc2.
  • the timing controller 14 according to the embodiment of the present invention is the same as the timing controller in the prior art, and details are not described herein again.
  • the gamma circuit 15 can receive the fourth voltage signal V4 from the voltage conversion module 12, receive the data signal Data from the interface module 11, and output the gamma voltage Vg.
  • the gamma circuit 15 according to the embodiment of the present invention is the same as the gamma circuit in the prior art, and details are not described herein again.
  • Fig. 6 is a block diagram showing the structure of a panel driving apparatus according to a fourth embodiment of the present invention.
  • the panel driving device 40 in FIG. 6 may further include a gate driving circuit 16 and a source driving circuit 17.
  • the gate driving circuit 16 can receive the second control signal Sc2 from the timing controller 14, and can output the gate driving signal Sg to the liquid crystal panel.
  • the gate driving circuit 16 according to the embodiment of the present invention is the same as the gate driving circuit in the prior art, and details are not described herein again.
  • the source driving circuit 17 can receive the fourth voltage V4 from the voltage conversion module 12, receive the gamma voltage Vg from the gamma circuit 15, and can output the source driving signal Ss to the liquid crystal panel. Root
  • the source driving circuit 17 according to the embodiment of the present invention is the same as the source driving circuit in the prior art, and details are not described herein again.
  • an exemplary embodiment of the present invention also provides a display device including the panel driving device of any of the above.
  • the display device by applying the compensation voltage signal Vc to the input or output of the interface module 11, the display device according to the embodiment of the present invention can compensate for cable transmission loss and loss on the trace of the printed circuit board, so that voltage conversion
  • the third voltage signal V3 at the input of the module 12 is equal to the first voltage signal V1 at the input of the interface module 11, so that abnormal operation of the liquid crystal panel can be avoided.
  • the display device in this embodiment may be any product or component having a display function, such as a display panel, an electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, and the like.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种面板驱动装置以及显示装置。该面板驱动装置包括接口模块（11）、电压转换模块（12）以及补偿模块（13）。接口模块（11）包括第一输入端和第一输出端。电压转换模块（12）包括第二输入端和第二输出端。第一输出端耦接到第二输入端。第一输入端处的电压为第一电压信号（V1），第一输出端处的电压为第二电压信号（V2），第二输入端处的电压为第三电压信号（V3），第二输出端处的电压为第四电压信号（V4）。补偿模块（13）被配置为根据第三电压信号（V3）生成补偿电压信号并将补偿电压信号施加到第一输入端或者第一输出端，以使得第三电压信号（V3）与第一电压信号（V1）相等。此面板驱动装置以及显示装置，能够补偿线缆传输损耗和印刷电路板的走线损耗，从而可以避免液晶面板的工作异常。

Description

面板驱动装置以及显示装置
相关申请的交叉引用
本申请要求于2016年06月03日递交的中国专利申请第201610389582.6号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本发明的示例性实施例涉及显示技术领域，更加具体地，涉及一种面板驱动装置以及显示装置。
背景技术
现有的TFT-LCD显示装置通常包括面板驱动装置，而面板驱动装置包括接口模块以及电压转换模块。具体地，接口模块从电源模块接收第一电压，并输出第二电压，然后通过印刷电路板的走线向电压转换模块提供该第二电压。由于接口模块中的传输线缆上的电压损耗，接口模块输出的第二电压通常低于接口模块接收的第一电压。由于印刷电路板的走线上的电压损耗，电压转换模块实际接收的第三电压通常低于接口模块输出的第二电压。相应地，电压转换模块实际接收的第三电压通常低于接口模块接收的第一电压。
在这种情况下，由于电压转换模块接收的第三电压偏低，可能导致电压转换模块工作异常或者电压转换模块的输出电压异常，从而导致TFT-LCD显示装置工作异常。尤其当面板驱动装置的负载较大时，该现象将会更加严重。
发明内容
本发明的示例性实施例提供了一种面板驱动装置以及显示装置，其能够补偿传输线缆上的电压损耗以及印刷电路板的走线上的电压损耗，使得 电压转换模块的输入端处接收的第三电压信号与接口模块的输入端处接收的第一电压信号相等，从而可以避免液晶面板的工作异常。
根据本发明的一方面，提供了一种面板驱动装置，包括接口模块、电压转换模块以及补偿模块。接口模块包括第一输入端和第一输出端。电压转换模块包括第二输入端和第二输出端。所述第一输出端耦接到所述第二输入端。所述第一输入端处的电压为第一电压，所述第一输出端处的电压为第二电压，所述第二输入端处的电压为第三电压信号，所述第二输出端处的电压为第四电压信号。补偿模块被配置为根据所述第三电压信号生成补偿电压信号并将所述补偿电压信号施加到所述第一输入端或者所述第一输出端，以使得所述第三电压信号与所述第一电压信号相等。
根据本发明的示例性实施例，所述补偿模块包括第一电阻、差分放大电路以及转换单元。所述第一电阻的第一端接收所述第三电压信号，所述第一电阻的第二端接地，所述差分放大电路的两个输入端分别耦接所述第一电阻的两端，所述差分放大电路的输出端耦接所述转换单元。
根据本发明的示例性实施例，所述补偿模块包括第一电阻、第二电阻、差分放大电路以及转换单元。所述第一电阻的第一端接收所述第三电压信号，所述第一电阻的第二端通过第二电阻接地，所述差分放大电路的两个输入端分别耦接所述第一电阻的两端，所述差分放大电路的输出端耦接所述转换单元。
根据本发明的示例性实施例，所述差分放大电路包括差分放大器、第三电阻、第四电阻、第五电阻以及第六电阻。所述第三电阻的一端耦接所述第一电阻的第一端，所述第三电阻的另一端耦接所述差分放大器的第一输入端，所述第四电阻的一端耦接所述第一电阻的第二端，所述第四电阻的另一端耦接所述差分放大器的第二输入端，所述第五电阻的一端接地，所述第五电阻的另一端耦接所述差分放大器的第一输入端，所述第六电阻的一端耦接所述差分放大器的第二输入端，所述第六电阻的另一端耦接所述差分放大器的输出端。
根据本发明的示例性实施例，在所述差分放大电路中，所述第五电阻 与所述第三电阻的比值等于所述第六电阻与所述第四电阻的比值。
根据本发明的示例性实施例，所述转换单元被配置为将所述差分放大器的输出电压的参考电压与所述差分放大器的输出电压的差值乘以预置的系数，以获得所述补偿电压信号的值。
根据本发明的示例性实施例，所述面板驱动装置还包括时序控制器，其被配置为从所述接口模块接收第一控制信号，从所述电压转换模块接收所述第四电压信号，以及输出第二控制信号。
根据本发明的示例性实施例，所述面板驱动装置还包括栅极驱动电路，其被配置为从所述时序控制器接收第二控制信号，并输出栅极驱动信号。
根据本发明的示例性实施例，所述面板驱动装置还包括伽马电路，其被配置为从所述电压转换模块接收所述第四电压信号，从所述接口模块接收数据信号，以及输出伽马电压。
根据本发明的示例性实施例，所述面板驱动装置还包括源极驱动电路，其被配置为从所述电压转换模块接收所述第四电压，从所述伽马电路接收伽马电压，并输出源极驱动信号。
根据本发明的另一方面，还提供了一种显示装置，包括如上任一所述的面板驱动装置。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是根据本发明的第一实施例的面板驱动装置的结构框图；
图2是根据本发明的一个实施例的补偿模块的电路图；
图3是根据本发明的另一个实施例的补偿模块的电路图；
图4是根据本发明的第二实施例的面板驱动装置的结构框图；
图5是根据本发明的第三实施例的面板驱动装置的结构框图；以及
图6是根据本发明的第四实施例的面板驱动装置的结构框图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整的描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他的实施例，都属于本发明保护的范围。
此外，在本发明的描述中，除非另有说明，“多个”的含义是指两个或更多。此处，术语“第一”、“第二”等仅用于区分不同的部件或者步骤，不应理解为是对部件或者步骤的具体限定。
图1示出了根据本发明的第一实施例的面板驱动装置10的结构框图。
如图1所示，根据本发明的第一实施例的面板驱动装置10可包括接口模块11，电压转换模块12以及补偿模块13。
具体地，接口模块11可在其输入端接收来自电源模块的第一电压信号V1，并从其输出端向电压转换模块12输出第二电压信号V2，由于接口模块11中的线缆传输损耗，第二电压信号V2通常低于第一电压信号V1。
电压转换模块12可通过印刷电路板的走线接收来自接口模块11的第二电压信号V2。由于印刷电路板的走线损耗，在电压转换模块12的输入端处接收到的电压信号为第三电压信号V3。第三电压信号V3通常低于第二电压信号V2。相应地，第三电压信号V3也低于第一电压信号V1。电压转换模块12被配置为通过升压电路或者降压电路将第三电压信号V3转换为第四电压信号V4。
补偿模块13可根据第三电压信号V3生成补偿电压信号Vc，并将该补偿电压信号Vc输入到接口模块11的输入端，以使得第三电压信号V3与第一电压信号V1相等。
由此，通过将补偿电压信号Vc输入到接口模块11的输入端，根据本 发明实施例的面板驱动装置10，能够补偿线缆传输损耗以及印刷电路板的走线上的损耗，使得电压转换模块12接收的第三电压信号V3与第一电压信号V1相等，从而可以避免液晶面板的工作异常。
为了使得第三电压V3保持与第一电压信号V1相等，当第三电压V3与第三电压V3的参考电压出现偏差时，需相应地产生补偿电压信号Vc，以便对接口模块11的输入端进行补偿。
图2示出了根据本发明的一个实施例的补偿模块的电路图。
如图2所示，补偿模块13可包括第一电阻R1、差分放大电路131以及转换单元132。第一电阻R1的第一端接收第三电压信号V3，第一电阻R1的第二端通过第二电阻R2接地。此时，第一电阻R1的第二端的电压为V3*R2/(R1+R2)，第一电阻R1两端的电压差为ΔV＝V3*R1/(R1+R2)。差分放大电路131的两个输入端分别耦接第一电阻R1的两端。差分放大电路131的输出端耦接转换单元132，其输出基于第一电阻R1两端的电压差的输出电压Vo，即输出电压Vo为V3*R1/(R1+R2)的倍数。
如图2所示，差分放大电路131包括差分放大器AMP、第三电阻R3、第四电阻R4、第五电阻R5以及第六电阻R6。其中，第三电阻R3的一端耦接第一电阻R1的第一端，第三电阻R3的另一端耦接差分放大器AMP的第一输入端。第四电阻R4的一端耦接第一电阻R1的第二端，第四电阻R4的另一端耦接差分放大器AMP的第二输入端。第五电阻R5的一端接地，第五电阻R5的另一端耦接差分放大器AMP的第一输入端。第六电阻R6的一端耦接差分放大器AMP的第二输入端，第六电阻R6的另一端耦接差分放大器AMP的输出端。
如图2所示，差分放大器AMP的第一输入端为差分放大器AMP的同向输入端(+)，差分放大器AMP的第二输入端为差分放大器AMP的反向输入端(-)。值得注意的是，根据本发明的示例性实施例，差分放大器AMP的第一输入端还可以是差分放大器AMP的反向输入端(-)，而差分放大器AMP的第二输入端还可以是差分放大器AMP的同向输入端(+)。
如图2所示，为了简化差分放大器AMP输出电压的计算，假设第五 电阻R5与第三电阻R3的比值等于第六电阻R6与第四电阻R4的比值，此时，差分放大器AMP的输出电压Vo为：
Figure PCTCN2017081872-appb-000001
假设接口模块11的输入端处接收的第一电压信号V1为3.3V，接口模块11的输出端处输出的第二电压信号V2为3.2V，而电压转换模块12的输入端处接收的第三电压信号V3为3.1V，R1＝R2，R6＝6*R4，则根据式(1)差分放大器的输出电压Vo为第三电压V3的三倍。此时，第三电压V3的参考电压设置为3.3V，差分放大器的输出电压Vo的参考电压为9.9V，而差分放大器的实际输出电压为3*3.1V，即差分放大器的实际输出电压为9.3V。
此时，补偿电压信号Vc的值可以通过转换单元132而被设置为差分放大器的输出电压的参考电压与差分放大器的输出电压Vo的差值乘以预置的第一系数k1，即补偿电压信号Vc可被设置为k1*(9.9-9.3)V＝k1*0.6V，其中，第一系数k1可以通过先验方式获得。例如，第一系数k1可被设置为1/3，此时，补偿电压信号Vc为0.2V。
通过将补偿电压信号Vc输入接口模块11的输入端，可以将补偿电压信号Vc与第一电压信号V1之和施加到输入接口模块11的输入端，从而使接口模块11的输入端处的电压为3.5V。这样，根据如前所述的衰减规律，接口模块11输出端处的第二电压信号V2为3.4V，而电压转换模块12输入端处的第三电压信号V3为3.3V，其与第一电压信号V1相等。
图3示出了根据本发明的另一个实施例的补偿模块的电路图。
与图2不同的是，图3中的第一电阻R1的第二端直接接地。此时，图3中的补偿模块13的实施例可以看作是图2中的第二电阻取值为零时补偿模块13的特殊情形。此时，第一电阻R1两端的电压差为ΔV＝V3。
如图3所示，为了简化差分放大器AMP输出电压的计算，假设第五电阻R5与第三电阻R3的比值等于第六电阻R6与第四电阻R4的比值，此时，差分放大器的输出电压Vo为：
Figure PCTCN2017081872-appb-000002
假设接口模块11的输入端处接收的第一电压信号V1为3.3V，接口模块11的输出端处输出的第二电压信号V2为3.2V，而电压转换模块12的输入端处接收的第三电压信号V3为3.1V，R6＝6*R4，则根据式(2)差分放大器的输出电压Vo为第三电压V3的六倍。此时，第三电压V3的参考电压设置为3.3V，差分放大器的输出电压Vo的参考电压为6*3.3V＝19.8V，而差分放大器的实际输出电压为6*3.1V，即差分放大器的实际输出电压为18.6V。
此时，补偿电压信号Vc的值可以通过转换单元132而被设置为差分放大器的输出电压的参考电压与差分放大器的输出电压Vo的差值乘以预置的第二系数k2，即补偿电压信号Vc可被设置为k2*(19.8-18.6)V＝k2*1.2V，其中，第二系数k2可以通过先验方式获得。例如，第二系数k2可被设置为1/6，此时，补偿电压信号Vc为0.2V。
通过将补偿电压信号Vc输入接口模块11的输入端，可以将补偿电压信号Vc与第一电压信号V1之和施加到输入接口模块11的输入端，从而使接口模块11的输入端处的电压为3.5V。这样，根据如前所述的衰减规律，接口模块11输出端处的第二电压信号V2为3.4V，而电压转换模块12输入端处的第三电压信号V3为3.3V，其与第一电压信号V1相等。
图4示出了根据本发明的第二实施例的面板驱动装置的结构框图。
如图4所示，根据本发明的第二实施例的面板驱动装置20包括接口模块11，电压转换模块12以及补偿模块13。
与图1不同的是，在图4中将补偿模块13生成的补偿电压信号Vc施加到接口模块11的输出端，以使得第三电压信号V3与第一电压信号V1相等。
由此，通过将补偿电压信号Vc施加到接口模块11的输出端，根据本发明实施例的面板驱动装置20，能够补偿线缆传输损耗以及印刷电路板的走线上的损耗，使得电压转换模块12接收的第三电压信号V3与第一电压 信号V1相等，从而可以避免液晶面板的工作异常。
由于补偿模块13生成补偿电压信号Vc的方式已在上文中叙述，在此不再赘述。
当将如图2所示的补偿模块13应用于如图4所示的面板驱动装置20时，假设接口模块11的输入端处接收的第一电压信号V1为3.3V，接口模块11的输出端处输出的第二电压信号V2为3.2V，而电压转换模块12的输入端处接收的第三电压信号V3为3.1V，R1＝R2，R6＝6*R4，则根据式(1)差分放大器的输出电压Vo为第三电压V3的三倍。此时，第三电压V3的参考电压设置为3.3V，差分放大器的输出电压Vo的参考电压为9.9V，而差分放大器的实际输出电压为3*3.1V，即差分放大器的实际输出电压为9.3V。
此时，补偿电压信号Vc的值可以通过转换单元132而被设置为差分放大器的输出电压的参考电压与差分放大器的输出电压Vo的差值乘以预置的第三系数k3，即补偿电压信号Vc被可设置为k3*(9.9-9.3)V＝k3*0.6V，其中，第三系数k3可以通过先验方式获得。例如，第三系数k3可被设置为1/3，此时，补偿电压信号Vc为0.2V。
通过将补偿电压信号Vc施加到接口模块11的输出端，可以将补偿电压信号Vc与第二电压信号V2之和施加到输入接口模块11的输出端，从而使接口模块11的输出端处的电压为3.4V。这样，根据如前所述的衰减规律，电压转换模块12输入端处的第三电压信号V3为3.3V，其与第一电压信号V1相等。
当将如图3所示的补偿模块13应用于如图4所示的面板驱动装置20时，假设接口模块11的输入端处接收的第一电压信号V1为3.3V，接口模块11的输出端处输出的第二电压信号V2为3.2V，而电压转换模块12的输入端处接收的第三电压信号V3为3.1V，R6＝6*R4，则根据式(2)差分放大器的输出电压Vo为第三电压V3的六倍。此时，第三电压V3的参考电压设置为3.3V，差分放大器的输出电压Vo的参考电压为19.8V，而差分放大器的实际输出电压为6*3.1V，即差分放大器的实际输出电压为18.6V。
此时，补偿电压信号Vc的值可以通过转换单元132而被设置为差分放大器的输出电压的参考电压与差分放大器的输出电压Vo的差值乘以预置的第四系数k4，即补偿电压信号Vc可被设置为k4*(19.8-18.6)V＝k4*1.2V，其中，第四系数k4可以通过先验方式获得。例如，第四系数k4可被设置为1/6，此时，补偿电压信号Vc为0.2V。
通过将补偿电压信号Vc施加到接口模块11的输出端，可以将补偿电压信号Vc与第二电压信号V2之和施加到输入接口模块11的输出端，从而使接口模块11的输出端处的电压为3.4V。这样，根据如前所述的衰减规律，电压转换模块12输入端处的第三电压信号V3为3.3V，其与第一电压信号V1相等。
图5示出了根据本发明的第三实施例的面板驱动装置的结构框图。
与图1不同的是，图5中的面板驱动装置30还可包括时序控制器14和伽马电路15。
具体地，时序控制器14可从接口模块11接收第一控制信号Sc1，从电压转换模块12接收第四电压信号V4，以及输出第二控制信号Sc2。根据本发明实施例的时序控制器14与现有技术中的时序控制器相同，在此不再赘述。
具体地，伽马电路15可从电压转换模块12接收第四电压信号V4，从接口模块11接收数据信号Data，以及输出伽马电压Vg。根据本发明实施例的伽马电路15与现有技术中的伽马电路相同，在此不再赘述。
图6示出了根据本发明的第四实施例的面板驱动装置的结构框图。
与图5不同的是，图6中的面板驱动装置40还可包括栅极驱动电路16以及源极驱动电路17。
具体地，栅极驱动电路16可从时序控制器14接收第二控制信号Sc2，并可向液晶面板输出栅极驱动信号Sg。根据本发明实施例的栅极驱动电路16与现有技术中的栅极驱动电路相同，在此不再赘述。
具体地，源极驱动电路17可从电压转换模块12接收第四电压V4，从伽马电路15接收伽马电压Vg，并可向液晶面板输出源极驱动信号Ss。根 据本发明实施例的源极驱动电路17与现有技术中的源极驱动电路相同，在此不再赘述。
基于相同的构思，本发明的示例性实施例还提供了一种显示装置，包括如上任一所述的面板驱动装置。
由此，通过将补偿电压信号Vc施加到接口模块11的输入端或输出端，根据本发明实施例的显示装置，能够补偿线缆传输损耗以及印刷电路板的走线上的损耗，使得电压转换模块12的输入端处的第三电压信号V3与接口模块11的输入端处的第一电压信号V1相等，从而可以避免液晶面板的工作异常。
需要说明的是，本实施例中的显示装置可以为：显示面板、电子纸、手机、平板电脑、电视机、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上所述，仅为本发明的具体实施方式，但是，本发明的保护范围不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替代，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (11)

  1. 一种面板驱动装置，包括接口模块、电压转换模块以及补偿模块，
    其中，接口模块包括第一输入端和第一输出端，电压转换模块包括第二输入端和第二输出端，所述第一输出端耦接到所述第二输入端；
    其中，所述第一输入端处的电压为第一电压，所述第一输出端处的电压为第二电压，所述第二输入端处的电压为第三电压信号，所述第二输出端处的电压为第四电压信号；
    其中，补偿模块被配置为根据所述第三电压信号生成补偿电压信号，并将所述补偿电压信号施加到所述第一输入端或者所述第一输出端，以使得所述第三电压信号与所述第一电压信号相等。
  2. 根据权利要求1所述的面板驱动装置，所述补偿模块包括第一电阻、差分放大电路以及转换单元，其中，所述第一电阻的第一端接收所述第三电压信号，所述第一电阻的第二端接地，所述差分放大电路的两个输入端分别耦接所述第一电阻的两端，所述差分放大电路的输出端耦接所述转换单元。
  3. 根据权利要求1所述的面板驱动装置，所述补偿模块包括第一电阻、第二电阻、差分放大电路以及转换单元，其中，所述第一电阻的第一端接收所述第三电压信号，所述第一电阻的第二端通过第二电阻接地，所述差分放大电路的两个输入端分别耦接所述第一电阻的两端，所述差分放大电路的输出端耦接所述转换单元。
  4. 根据权利要求2或者3所述的面板驱动装置，所述差分放大电路包括差分放大器、第三电阻、第四电阻、第五电阻以及第六电阻，其中，所述第三电阻的一端耦接所述第一电阻的第一端，所述第三电阻的另一端耦接所述差分放大器的第一输入端，所述第四电阻的一端耦接所述第一电阻的第二端，所述第四电阻的另一端耦接所述差分放大器的第二输入端，所述第五电阻的一端接地，所述第五电阻的另一端耦接所述差分放大器的第一输入端，所述第六电阻的一端耦接所述差分放大器的第二输入端，所述第六电阻的另一端耦接所述差分放大器的输出端。
  5. 根据权利要求4所述的面板驱动装置，其中，在所述差分放大电路中，所述第五电阻与所述第三电阻的比值等于所述第六电阻与所述第四电阻的比值。
  6. 根据权利要求2或者3所述的面板驱动装置，其中，所述转换单元被配置为将所述差分放大器的输出电压的参考电压与所述差分放大器的输出电压的差值乘以预置的系数，以获得所述补偿电压信号的值。
  7. 根据权利要求1-6中任一项所述的面板驱动装置，还包括时序控制器，其被配置为从所述接口模块接收第一控制信号，从所述电压转换模块接收所述第四电压信号，以及输出第二控制信号。
  8. 根据权利要求7所述的面板驱动装置，还包括栅极驱动电路，其被配置为从所述时序控制器接收第二控制信号，并输出栅极驱动信号。
  9. 根据权利要求1-6中任一项所述的面板驱动装置，还包括伽马电路，其被配置为从所述电压转换模块接收所述第四电压信号，从所述接口模块接收数据信号，以及输出伽马电压。
  10. 根据权利要求9所述的面板驱动装置，还包括源极驱动电路，其被配置为从所述电压转换模块接收所述第四电压，从所述伽马电路接收伽马电压，并输出源极驱动信号。
  11. 一种显示装置，包括如权利要求1-10中任一项所述的面板驱动装置。
PCT/CN2017/081872 2016-06-03 2017-04-25 面板驱动装置以及显示装置 Ceased WO2017206630A1 (zh)

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