WO2016074251A1 - 阵列基板、显示设备及其驱动方法 - Google Patents

阵列基板、显示设备及其驱动方法 Download PDF

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Publication number
WO2016074251A1
WO2016074251A1 PCT/CN2014/091253 CN2014091253W WO2016074251A1 WO 2016074251 A1 WO2016074251 A1 WO 2016074251A1 CN 2014091253 W CN2014091253 W CN 2014091253W WO 2016074251 A1 WO2016074251 A1 WO 2016074251A1
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WIPO (PCT)
Prior art keywords
circuit
gamma
reference voltage
voltage
generating circuit
Prior art date
Application number
PCT/CN2014/091253
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English (en)
French (fr)
Inventor
许神贤
Original Assignee
深圳市华星光电技术有限公司
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 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to RU2017119758A priority Critical patent/RU2682306C2/ru
Priority to DE112014007060.2T priority patent/DE112014007060B4/de
Priority to JP2017525015A priority patent/JP6419333B2/ja
Priority to KR1020177015607A priority patent/KR101998004B1/ko
Priority to US14/408,674 priority patent/US9564076B2/en
Priority to GB1708690.1A priority patent/GB2547848B/en
Publication of WO2016074251A1 publication Critical patent/WO2016074251A1/zh

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Classifications

    • 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
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • 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
    • G09G3/2003—Display of colours
    • 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
    • G09G2230/00—Details of flat display driving waveforms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0294—Details of sampling or holding circuits arranged for use in a driver for data electrodes
    • 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

Definitions

  • the present invention relates to the field of display device technologies, and in particular, to an array substrate, a display device, and a driving method thereof.
  • a TFT-LCD display generally includes an array substrate, a color filter substrate, and a liquid crystal layer sandwiched therebetween.
  • the array substrate includes an effective display area composed of pixels arranged in an array, and further includes a data driving circuit source outside the effective display area.
  • the Driver and the scan driver circuit Gate Driver, the data drive circuit and the scan drive circuit are respectively connected to the respective pixels to drive the pixels for display.
  • the TFT-LCD display also needs to provide a gamma reference voltage for the data driving circuit.
  • the gamma voltage in the driving circuit of the liquid crystal panel is mainly used in two ways: one is to use voltage divider, and the other is Plus programmable control chip Power IC is shown in Figure 1.
  • the data driving circuit is also connected to the pulse generating circuit and the programmable control chip outside the array substrate, and the programmable control chip mainly serves to provide the gamma reference voltage for the data driving circuit.
  • this method of supplying voltage is low in cost, but the way of providing the voltage is not flexible and cannot be easily adjusted.
  • the programmable control chip directly gives the gamma voltage. This way of providing voltage is flexible.
  • the programmable control chip is relatively expensive, and the programmable control chip will undoubtedly increase the production cost.
  • the technical problem to be solved by the present invention is to provide an array substrate, a display device and a driving method thereof, which can reduce the cost compared with the programmable control chip; and can be easily adjusted compared with the use of the resistor partial pressure.
  • a technical solution adopted by the present invention is to provide an array substrate including a display area, a data driving circuit, and a gamma generating circuit:
  • the display area has a plurality of display pixel units
  • the data driving circuit is disposed outside the effective display area and provides a driving signal for the display pixel unit;
  • the gamma voltage generating circuit provides a gamma reference voltage for the data driving circuit, the gamma voltage generating circuit inputs a PWM signal from the pulse generating circuit, and obtains a gamma reference voltage according to the PWM signal to output to the data driving circuit;
  • the array substrate further includes a pulse generating circuit connected to the gamma voltage generating circuit, the pulse generating circuit includes a pulse modulation sub-circuit, and the gamma voltage generating circuit is connected to the pulse modulation sub-circuit;
  • the gamma voltage generating circuit comprises a displacement register, a gate sub-circuit, a charging and discharging electronic circuit, and a sample-and-hold sub-circuit sequentially connected. Further, the shift register is further connected to the charging and discharging electronic circuit, the sample-and-hold sub-circuit, or the gate sub-circuit and A switch is further connected in series between the charging and discharging electronic circuit, the switch is also connected to the power source, and the sampling and holding sub-circuit is connected to the data driving circuit, wherein the shift register is specifically used to expand the sequence of the PWM signal into a plurality of parallel PWM signals, and the sample and hold are performed.
  • the module is specifically configured to stabilize the gamma reference voltage and output to the data driving circuit, wherein the connection between the gamma voltage generating circuit and the driving circuit is replaced or printed by using a thin film field effect transistor on the array substrate On the array substrate.
  • the storage voltage of the capacitor that supplies the gamma reference voltage to the data driving circuit is cleared.
  • the switch comprises a thin film field effect transistor.
  • another technical solution adopted by the present invention is to provide a display device, where the display device includes:
  • the array substrate comprising an effective display area having a plurality of display pixel units, a data driving circuit disposed outside the effective display area and providing a driving signal to the display pixel unit, and a gamma reference voltage for the data driving circuit a gamma voltage generating circuit, wherein the pulse generating circuit is respectively connected to the data driving circuit and the gamma generating circuit, the gamma voltage generating circuit inputs the PWM signal from the pulse generating circuit, and obtains the gamma reference voltage according to the PWM signal to output to the data Drive circuit.
  • Another technical solution adopted by the present invention is to provide a driving method, including the following steps:
  • a gamma reference voltage is output to the data drive circuit to drive display of the display pixel unit.
  • the step of obtaining the gamma reference voltage comprises:
  • the PWM signals of different widths are used as control signals to charge and discharge the capacitors that provide the gamma reference voltage.
  • the control signal is high voltage, the capacitors are charged.
  • the voltage is low, the charging is stopped. The next time, the charging is stopped.
  • the capacitor is recharged, first turn the amount of charge on the capacitor to zero to ensure that the charge does not accumulate;
  • the gamma reference voltage is stabilized and output to the data drive circuit.
  • the step of obtaining the gamma reference voltage further comprises emptying the storage voltage of the capacitor when the gamma reference voltage is reset.
  • the invention has the beneficial effects that the array provided by the invention basically integrates the gamma generating circuit therein, and at least a part or all of the gamma generating circuit is simultaneously fabricated with other components of the array substrate in the Array process, which is practical in process cost and material cost. Not much increase, than making a Power separately
  • the cost of IC is greatly reduced; compared with the use of resistor divider, if the adjustable resistor is used, it is more difficult to use the computer to control the resistance change, and the adjustable resistor has the inherent instability problem of the analog circuit, so the resistor used will be determined according to the product model.
  • the voltage of the resistor and the voltage divided by the resistor are inconvenient to adjust.
  • the gamma reference voltage provided by the control signal to the data driving circuit through the power source is not limited by the model of the device, and is more convenient. Adjustment.
  • FIG. 1 is a schematic structural view showing a gamma voltage by using a programmable control chip in the prior art
  • FIG. 2 is a schematic structural view of an embodiment of a display device of the present invention.
  • FIG. 3 is a circuit diagram of an embodiment of an array substrate of the present invention.
  • FIG. 4 is a flow chart of an embodiment of a driving method of the present invention.
  • FIG. 5 is a flow chart showing another embodiment of the driving method of the present invention.
  • FIG. 6 is a schematic diagram of a full cycle voltage waveform of a PWM signal according to an embodiment of the driving method of the present invention.
  • FIG. 7 is a schematic diagram of a voltage waveform of a PWM signal passing through a shift register according to an embodiment of the driving method of the present invention
  • FIG. 8 is a schematic diagram showing voltage waveforms of a PWM signal passing or gate sub-circuit of an embodiment of a driving method of the present invention.
  • FIG. 9 is a schematic diagram of a voltage waveform of a PWM signal passing through a charging and discharging electronic circuit according to an embodiment of a driving method of the present invention.
  • FIG. 10 is a schematic diagram of a voltage waveform of a PWM signal passing through a sample-and-hold sub-circuit according to an embodiment of a driving method of the present invention
  • FIG. 11 is a schematic diagram of a voltage waveform of a PWM signal passing through a charging and discharging electronic circuit according to an embodiment of the driving method of the present invention
  • FIG. 12 is a schematic diagram showing voltage waveforms of a PWM signal passing through a charging and discharging electronic circuit and a sample-and-hold sub-circuit according to an embodiment of the driving method of the present invention.
  • FIG. 2 is a schematic structural diagram of an embodiment of a display device according to the present invention.
  • the display device includes an array substrate 110 and a pulse generating circuit 120.
  • the array substrate 110 includes a display region 111, a data driving circuit 112, and a gamma voltage generating circuit 113.
  • the display area 111 includes a plurality of display pixel units (not shown) arranged in an array for displaying corresponding images according to driving signals of the scan driving circuit 114 and the data driving circuit 112.
  • the data driving circuit 112 is for supplying a driving signal to the display pixel unit in the display area 111.
  • the gamma voltage generating circuit 113 is configured to receive the PWM signal generated by the pulse generating circuit 114, and control the switch to be turned on and off according to the PWM signal.
  • the switch When the switch is turned on, the capacitive charging of the gamma reference voltage is provided to the data driving circuit through the Vcc.
  • the switch When the switch is turned off, charging is stopped, and the gamma reference voltage supplied to the data driving circuit 112 is obtained.
  • the pulse generating circuit 120 is configured to generate a pulse driving signal, drive the scan driving circuit 114 and the data driving circuit 112, respectively, and supply a PWM signal to the gamma voltage generating circuit 113.
  • the present embodiment reduces the cost by integrating the gamma generating circuit into the array basic without adding an additional control chip, compared with a more expensive programmable control chip.
  • the program-controlled chip connection substrate requires a plurality of data lines. In the present invention, only one data line is required to output a PWM signal, and in the present invention, the connection between the gamma reference voltage generating circuit and the data driving can use the film on the array substrate.
  • the FET is replaced or printed on the substrate without burdening the array substrate, thereby reducing the number of required data lines between the pulse generating circuit and the substrate; if an adjustable resistor is used, It is difficult to use the computer to control the resistance change, and the adjustable resistor has the inherent instability problem of the analog circuit.
  • the commonly used resistor will determine the magnitude of the resistor and the voltage divided by the resistor according to the product model, which is inconvenient to adjust.
  • the PWM signal generated by the pulse generating circuit controls the switch to be turned on and off to drive data through the power source.
  • Gamma reference voltage provided by the device model without limitation, easier adjustment.
  • FIG. 3 is a schematic structural diagram of an embodiment of an array substrate according to the present invention.
  • the array substrate may be the array substrate 110 in the display device of FIG.
  • the array substrate includes a gamma voltage generating circuit 220, a data driving circuit 230, a scan driving circuit 240, and a display area 240.
  • the gamma voltage generating circuit 220 includes a shift register 221, or a gate sub-circuit 222, a switch 223, a charge and discharge electronic circuit 224, and a sample and hold sub-circuit 225.
  • the shift register 221 is configured to receive the PWM signal generated by the pulse generating circuit 210 and expand the PWM signal into a plurality of PWM signals in parallel.
  • the pulse generating circuit 210 generates a PWM signal having five pulse signals in one cycle.
  • FIG. 7 is a schematic diagram showing the voltage waveform of the PWM signal passing through the shift register according to an embodiment of the driving method of the present invention.
  • the shift register 221 receives the W_discharge, W1, W2, W3, and W_sample signals of the sequence generated by the pulse generating circuit 210, and expands the PWM signal of the sequence into a plurality of SR_discharge, SR1, SR in parallel. 2.
  • SR 3 SR _sample signal, SR_discharge signal is transmitted to the charging and discharging electronic circuit 224 and the sample and hold sub-circuit 225, SR The _sample signal is transmitted to the hold sub-circuit 225, and the SR1, SR 2, SR 3 signals are transmitted to the OR gate circuit 222.
  • the OR gate circuit 222 is configured to receive the three parallel PWM signals and integrate the three parallel PWM signals into PWM signals of different widths.
  • FIG. 8 is a PWM signal passing or gate circuit voltage waveform according to an embodiment of the driving method of the present invention.
  • OR gate sub-circuit 222 will be in parallel with multiple PWM signals SR1, SR 2, SR
  • the signals are integrated into OR1, OR2, OR3 signals of different widths and transmitted to the switch 223.
  • the switch 223 includes a thin film field effect transistor or other equivalent functional components, and the switch 223 is respectively connected to the gate circuit 222 and Vcc (Fig. Show), charging and discharging electronic circuit 224.
  • the switch 223 controls the opening and closing of the switch with a PWM signal to control the passage of voltage and current.
  • the switch 223 is a thin film field effect transistor, or other component of an equivalent function, and the PWM signal of different widths is used to control the opening and closing of the switch 223.
  • the PWM signal is high voltage
  • the switch 223 is turned on when PWM
  • the switch 223 is turned off.
  • the charging and discharging electronic circuit 224 is for charging and discharging the capacitance that supplies the gamma reference voltage to the data driving circuit 230 according to the turning on and off of the switch 223.
  • FIG. 9 is a schematic diagram showing voltage waveforms of a PWM signal passing through a charging and discharging electronic circuit according to an embodiment of the driving method of the present invention.
  • the switch 223 When the switch 223 is turned on, the capacitor is charged through Vcc, and when the switch 223 is turned off, the charging is stopped; and before the next recharge, the voltage on the capacitor is changed by the discharge signal SR_discharge in the PWM signal of the shift register 221 Become zero to ensure that charging does not accumulate.
  • FIG. 11 is a schematic diagram of a voltage waveform of a PWM signal passing through a charging and discharging electronic circuit according to an embodiment of the driving method of the present invention.
  • the sample-and-hold sub-circuit 225 is used to prevent the gamma reference voltage on the capacitor from being erroneous during charging, and the sample-and-hold sub-circuit 225 is used to stabilize the gamma reference voltage on the capacitor and output the stabilized voltage to the data driving circuit 230.
  • FIG. 10 is a schematic diagram showing voltage waveforms of a PWM signal passing through a sample-and-hold sub-circuit according to an embodiment of the driving method of the present invention. After the last PWM signal effective width W3 is over, the W_sample signal will be sent. At this time, the voltage of Vtar charges the capacitor to keep the voltage output to the data driving circuit 230 stable.
  • FIG. 12 is a schematic diagram of voltage waveforms of a PWM signal passing through a charging and discharging electronic circuit and a sample-and-hold sub-circuit according to an embodiment of the driving method of the present invention.
  • the data driving circuit 230 is configured to receive the gamma reference voltage generated by the gamma voltage generating circuit 220 and the control signal of the pulse generating circuit 210, and drive the display area 230 to display a corresponding image based on the accepted control signal.
  • the scan driving circuit 240 is for supplying a scan driving signal to the driving display area 230.
  • the display area 230 is for displaying a corresponding image based on the drive signals of the scan driving circuit 240 and the data driving circuit 102.
  • FIG. 4 is a flowchart of an embodiment of a driving method according to the present invention.
  • the present invention provides a driving method, including the following steps:
  • S101 Obtain a PWM signal from a pulse generating circuit.
  • the driving system of the flat panel display generally comprises a scan driving circuit and a data driving circuit, the scanning driving circuit is responsible for turning on or off a certain pixel, and the data driving circuit is responsible for providing a pixel voltage signal when a certain pixel is turned on, and the scanning driving circuit and the data driving are driven.
  • the circuit is controlled by the signal generated by TCon, and because the control signal generated by TCon is not enough, it needs to provide its reference voltage.
  • the PWM signal is generated by a pulse generating circuit, which may be a PWM signal generating sub-circuit or other equivalent circuit in TCon.
  • the switch controlled by the PWM signal obtained in step S101 is turned on and off to charge and discharge the capacitor that supplies the gamma reference voltage to the data generating circuit through the power supply.
  • the capacitor is turned on by Vcc. Charging, when the PWM signal is low voltage switch off, it stops charging; and before the next recharge, the voltage on the capacitor will be zero through the discharge signal to ensure that the charging will not accumulate, thus obtaining the gamma reference voltage.
  • the gamma reference voltage is output to a data driving circuit.
  • the data driving circuit converts the received signal into a driving signal and outputs it to the display area.
  • the display area displays a corresponding image based on the received scan drive circuit signal and the drive signal of the data drive circuit.
  • FIG. 5 is a flowchart of another embodiment of a driving method of the present invention.
  • the present invention provides a driving method, including the following steps:
  • the PWM signal is generated by the pulse generating circuit, and the flow proceeds to step S202.
  • the PWM signal output from the pulse generating circuit is expanded into a plurality of PWM signals through the shift register. If the PWM signal output from the pulse generating circuit contains five pulse signals, the PWM signal is expanded into five parallel PWM signals through the shift register. Step S203.
  • FIG. 8 is a PWM of an embodiment of the driving method of the present invention.
  • the signal passes through the voltage waveform diagram of the gate circuit.
  • the signals are integrated into OR1, OR2, OR3 signals of different widths and transmitted to the switch 223.
  • the switch 223 includes a thin film field effect transistor or other equivalent functional components, and the switch 223 is respectively connected to the gate circuit 222 and Vcc (Fig. Show), charging and discharging electronic circuit 224.
  • S204 Charge and discharge a capacitor that supplies a gamma reference voltage to the data driving circuit.
  • the PWM signal controlled by step S203 controls the switch to be turned on and off.
  • the capacitor is charged through Vcc.
  • the PWM signal is low, the charging is stopped; and before the next recharge, the first time is The discharge signal turns the capacitance to zero, ensuring that the charging does not accumulate, and proceeds to step S205.
  • the gamma reference voltage is stabilized using the sample and hold sub-circuit 225, and the discharge signal of the PWM signal of step S204 is emptied to store the gamma reference voltage for the data drive circuit.
  • the voltage proceeds to step S206.
  • the stable gamma reference voltage is output to the data driving circuit.
  • the driving method of the present invention is further illustrated by taking a complete cycle in an embodiment as an example. Take a PWM signal with five pulse signals in one cycle as an example.
  • FIG. 6 is a schematic diagram of a full cycle voltage waveform of a PWM signal according to an embodiment of the driving method of the present invention.
  • the pulse generation circuit generates a PWM signal, including W_discharge, W1, W2, W3, and W_sample, and the W1, W2, and W3 signals are transmitted to the shift register, and are converted into parallel SR_discharge, SR1, SR by the shift register. 2.
  • SR 3 SR _sample signal SR_discharge signal is transmitted to the charging and discharging electronic circuit and the sample-and-hold sub-circuit, SR The _sample signal is transmitted to the hold subcircuit, SR1, SR 2, SR
  • the 3 signal is converted into OR1, OR2, OR3 signals by the OR gate circuit, and the ON, OR2, OR3 signals are used to control the opening and closing of the thin film field effect transistor.
  • OR1, OR2, OR3 signals are high voltage, the Vcc is directed to the data.
  • the drive circuit provides capacitive charging of the gamma reference voltage, and stops charging the capacitor when it is low.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Picture Signal Circuits (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

一种阵列基板（110）、显示设备及其驱动方法。阵列基板（110）包括：具有多个显示像素单元的有效显示区域（111）；设置于有效显示区域（111）外，并为显示像素单元提供驱动信号的数据驱动电路（112）；为数据驱动电路（112）提供伽马参考电压的伽马电压产生电路（113）。驱动方法中，伽马电压产生电路（113）输入来自脉冲产生电路（120）的PWM信号，并根据PWM信号得到伽马参考电压以输出至数据驱动电路（112）。伽马电压的产生方式，与采用可编程式控制的芯片相比，缩减了成本；与采用电阻分压相比，方便调整。

Description

阵列基板、显示设备及其驱动方法
【技术领域】
本发明涉及显示设备技术领域，特别是涉及阵列基板、显示设备及其驱动方法。
【背景技术】
TFT-LCD显示器一般包括阵列基板、彩色滤光基板及夹持在其间的液晶层。阵列基板包括由阵列排列的像素组成的有效显示区域，还包括有效显示区域外的数据驱动电路Source Driver和扫描驱动电路Gate Driver，数据驱动电路和扫描驱动电路分别和各个像素连接以驱动像素进行显示。
TFT-LCD显示器还需要为数据驱动电路提供伽马参考电压，目前，液晶面板的驱动电路中的伽马电压的产生，业界主要采用两种方式：一种是用电阻分压，另一种是加上可编程式控制芯片的Power IC如图1。对于第二种，数据驱动电路还分别连接阵列基板之外的脉冲产生电路和可编程式控制芯片，可编程式控制芯片主要作用是为数据驱动电路提供伽马参考电压。
通过第一种方式，即采用电阻分压，这种提供电压的方式虽然成本较低，但是提供电压的方式不灵活，无法方便调整。通过第二种方式，即可编程式控制芯片直接给出伽马电压，这种提供电压的方式灵活，但是，可编程式控制芯片成本比较昂贵，采用可编程式控制芯片无疑会提高生产成本。
【发明内容】
本发明主要解决的技术问题是提供一种阵列基板、显示设备及其驱动方法，与采用可编程式控制芯片相比，能够缩减成本；与采用电阻分压相比，能够方便调整。
为解决上述技术问题，本发明采用的一个技术方案是，提供一种阵列基板，该阵列基板包括显示区域、数据驱动电路、伽马产生电路：
显示区域具有多个显示像素单元；
数据驱动电路设置于有效显示区域外，并为显示像素单元提供驱动信号；
伽马电压产生电路为数据驱动电路提供伽马参考电压，该伽马电压产生电路输入来自脉冲产生电路的PWM信号，并根据PWM信号得到伽马参考电压以输出至数据驱动电路；
其中，阵列基板进一步包括连接伽马电压产生电路的脉冲产生电路，该脉冲产生电路包括脉冲调制子电路，伽马电压产生电路与脉冲调制子电路相连；
其中，伽马电压产生电路包括依序连接的位移寄存器、或门子电路、充放电子电路、采样保持子电路，进一步，位移寄存器还与充放电子电路、采样保持子电路相连，或门子电路与充放电子电路之间还串联一开关，开关还与电源相连，采样保持子电路与数据驱动电路相连，其中，位移寄存器具体用于将序列的PWM信号展开成并列的多个PWM信号，采样保持模块具体用于稳定伽马参考电压，并输出至数据驱动电路，其中，所述伽马电压产生电路与所述驱动电路之间连接使用所述阵列基板上的薄膜场效应管代替或印刷在所述阵列基板上。
其中，当伽马参考电压被重新设定时，清空为数据驱动电路提供伽马参考电压的电容的储存电压。
其中，开关包括薄膜场效应晶体管。
为解决上述技术问题，本发明采用的另一个技术方案是，提供一种显示设备，显示设备包括：
脉冲产生电路和阵列基板，阵列基板包括具有多个显示像素单元的有效显示区域、设置于有效显示区域外并为显示像素单元提供驱动信号的数据驱动电路、为数据驱动电路提供伽马参考电压的伽马电压产生电路，其中，脉冲产生电路分别与数据驱动电路、伽马产生电路相连，伽马电压产生电路输入来自脉冲产生电路的PWM信号，并根据PWM信号得到伽马参考电压以输出至数据驱动电路。
为解决上述技术问题，本发明采用的又一个技术方案是，提供一种驱动方法，包括以下步骤：
获得来自脉冲产生电路的PWM信号；
根据PWM信号获得伽马参考电压；
输出伽马参考电压至数据驱动电路，以驱动显示像素单元的显示。
其中，获得伽马参考电压的步骤包括：
将序列的PWM信号展开成并列的多个PWM信号；
将并列的PWM信号整合成不同宽度的PWM信号；
将不同宽度的PWM信号为控制信号对作为提供伽马参考电压的电容进行充放电，当控制信号为高电压时则对电容会充电，当为低电压时则停止充电，其中，下一次要对电容重新充电之前，先将电容上电荷量变成零，以确保充电不会累积；
稳定伽马参考电压并输出至数据驱动电路。
其中，获得伽马参考电压的步骤进一步包括当伽马参考电压被重新设定时，清空电容的储存电压。
本发明的有益效果是：本发明提供的阵列基本将伽马产生电路集成在其中，伽马产生电路至少一部分或全部与阵列基板其他元件在Array制程中同时制作，在工艺成本和材料成本上实际增加不大，比单独制作一个Power IC成本大幅降低；与采用电阻分压相比，如果采用可调电阻，使用电脑控制电阻变换比较困难，而且可调电阻还有模拟电路固有的不稳定问题，所以采用的电阻会根据产品型号确定其电阻大小和电阻上分得的电压，不方便调整，本发明根据脉冲产生电路产生的PWM信号为控制信号透过电源向数据驱动电路提供的伽马参考电压，无须受设备型号限制，更方便调整。
【附图说明】
图1是现有方式中通过采用可编程式控制的芯片提供伽马电压的结构示意图；
图2是本发明显示设备一实施例的结构示意图；
图3是本发明阵列基板一实施例的电路示意图；
图4是本发明驱动方法一实施方式的流程图；
图5是本发明驱动方法另一实施方式的流程图；
图6是本发明驱动方法一实施例的PWM信号一完整周期电压波形示意图；
图7是本发明驱动方法一实施例的PWM信号通过位移寄存器电压波形示意图；
图8是本发明驱动方法一实施例的PWM信号通过或门子电路电压波形示意图；
图9是本发明驱动方法一实施例的PWM信号通过充放电子电路电压波形示意图；
图10是本发明驱动方法一实施例的PWM信号通过采样保持子电路电压波形示意图；
图11是本发明驱动方法一实施例的PWM信号通过充放电子电路电压波形示意图；
图12是本发明驱动方法一实施例的PWM信号通过充放电子电路和采样保持子电路电压波形示意图。
【具体实施方式】
下面结合附图和实施方式对本发明进行详细说明。
请参阅图2，图2是本发明显示设备一实施例的结构示意图。该显示设备包括阵列基板110和脉冲产生电路120。
阵列基板110包括显示区域111、数据驱动电路112以及伽马电压产生电路113。
显示区域111包括阵列排布的多个显示像素单元（图未示），用于根据扫描驱动电路114和数据驱动电路112的驱动信号显示对应图像。
数据驱动电路112用于向显示区域111中显示像素单元提供驱动信号。
伽马电压产生电路113用于接受脉冲产生电路114产生的PWM信号，根据PWM信号控制开关开启和关闭，当开关开启时则透过Vcc对向数据驱动电路提供伽马参考电压的电容充电，当开关关闭时则停止充电，获得向数据驱动电路112提供的伽马参考电压。
脉冲产生电路120用于产生脉冲驱动信号，分别驱动扫描驱动电路114、数据驱动电路112，并提供PWM信号给伽马电压产生电路113。
区别于现有技术的情况，本实施方式通过将伽马产生电路集成在阵列基本中，不需要增加额外的控制芯片，与采用价格比较昂贵的可编程式控制的芯片相比，缩减了成本，并且编程式控制的芯片连接基板需要多根数据线，本发明中只需一根数据线输出PWM信号，而本发明中伽马参考电压产生电路与数据驱动之间连接可以使用阵列基板上的薄膜场效应管代替或印刷在基板上，不会对阵列基板产生负担，从而减少了脉冲产生电路与基板之间的需要的数据线的数量；与采用电阻分压相比，如果采用可调电阻，使用电脑控制电阻变换比较困难，而且可调电阻还有模拟电路固有的不稳定问题，所以通常采用的电阻会根据产品型号确定其电阻大小和电阻上分得的电压，不方便调整，本发明根据脉冲产生电路产生的PWM信号控制开关开启与关闭透过电源向数据驱动电路提供的伽马参考电压，无须受设备型号限制，更方便调整。
请参阅图3，图3是本发明阵列基板一实施例的结构示意图，该阵列基板可以是图2所述显示设备中的阵列基板110。该阵列基板包括伽马电压产生电路220、数据驱动电路230、扫描驱动电路240、显示区域240。
伽马电压产生电路220包括位移寄存器221、或门子电路222、开关223、充放电子电路224和采样保持子电路225。
位移寄存器221用于接受脉冲产生电路210产生的PWM信号，并将PWM信号展开成并列的多个PWM信号。
比如，脉冲产生电路210产生一周期含有5个脉冲信号的PWM信号，请同时参阅图7，图7是本发明驱动方法一实施例的PWM信号通过位移寄存器电压波形示意图。位移寄存器221接受脉冲产生电路210产生的序列的W_discharge、W1、W2、W3、W_sample信号，将该序列的PWM信号展开成并列的多个SR_discharge、SR1、SR 2、SR 3、SR _sample信号，SR_discharge信号传输至充放电子电路224和采样保持子电路225，SR _sample信号传输至采用保持子电路225，SR1、SR 2、SR 3信号传输至或门子电路222。
或门子电路222用于接收所述并列的3个PWM信号，将并列的3个PWM信号整合成不同宽度的PWM信号。
比如将上述5个并列的PWM信号中的3条PWM信号整合成3条不同宽度的PWM信号，请同时参阅图8，图8是本发明驱动方法一实施例的PWM信号通过或门子电路电压波形示意图。或门子电路222将并列的多个PWM信号中SR1、SR 2、SR 3信号整合成不同宽度的OR1、OR2、OR3信号，并传输至开关223，开关223包括薄膜场效应晶体管，或其他等效功能的元器件，开关223分别连接或门子电路222、Vcc（图未示）、充放电子电路224。
开关223，以PWM信号控制开关的开启和关闭，从而控制电压电流的通过。
具体实施例中开关223为薄膜场效应晶体管，或等效功能的其他元器件，以上述不同宽度的PWM信号控制开关223的开启和关闭，当PWM信号为高电压时，开关223开启，当PWM信号为低电压时则开关223关闭。
充放电子电路224用于根据开关223的开启和关闭对向数据驱动电路230提供伽马参考电压的电容进行充放电。请参阅图9，图9是本发明驱动方法一实施例的PWM信号通过充放电子电路电压波形示意图。当开关223开启时则透过Vcc对电容充电，当开关223关闭时则停止充电；并当下一次要重新充电前，会先经通过位移寄存器221的PWM信号中放电信号SR_discharge将电容上的电压变成零，确保充电不会累积。同时请参阅图11，图11是本发明驱动方法一实施例的PWM信号通过充放电子电路电压波形示意图。
采样保持子电路225用于为避免充电时上述电容上的伽马参考电压错误，使用采样保持子电路225稳定电容上的伽马参考电压，并将稳定的电压输出到数据驱动电路230。请参阅图10，图10是本发明驱动方法一实施例的PWM信号通过采样保持子电路电压波形示意图。最后一个PWM信号有效宽度W3结束后，W_sample信号会被送出，这时候Vtar的电压会对电容充电，来保持输出到数据驱动电路230的电压稳定。其中Reset信号（discharge信号）用来清空电容的储存电压，当伽马参考电压被重新设定时，需要将电容清空。同时请参阅图12，图12是本发明驱动方法一实施例的PWM信号通过充放电子电路和采样保持子电路电压波形示意图。
数据驱动电路230用于接受伽马电压产生电路220产生的伽马参考电压和脉冲产生电路210的控制信号，根据所接受的控制信号，驱动显示区域230显示对应图像。
扫描驱动电路240用于提供给驱动显示区域230扫描驱动信号。
显示区域230用于根据扫描驱动电路240和数据驱动电路102的驱动信号显示对应图像。
请参阅图4，图4是本发明驱动方法一实施方式的流程图，本发明提供一种驱动方法，包括以下步骤：
S101：获得来自脉冲产生电路的PWM信号。
平板显示器的驱动系统一般包括扫描驱动电路和数据驱动电路，扫描驱动电路负责打开或关闭某像素，而数据驱动电路则负责在某像素打开时为其提供像素电压信号，而扫描驱动电路和数据驱动电路由TCon产生的信号控制，同时由于TCon产生的控制信号电压不够，需要额外提供其参考电压。PWM信号由脉冲产生电路产生，脉冲产生电路可以是TCon中PWM信号产生子电路或其他等效电路。
S102：根据所述PWM信号获得伽马参考电压。
根据步骤S101获得的PWM信号控制的开关开启和关闭透过电源对向数据产生电路提供伽马参考电压的电容进行充放电，当PWM信号为高电压开关开启时启则透过Vcc对所述电容充电，当PWM信号为低电压开关关闭时则停止充电；并当下一次要重新充电前，会先经放电信号将电容上电压变成零，确保充电不会累积，从而获得伽马参考电压。
S103：输出所述伽马参考电压至数据驱动电路。
将所述伽马参考电压输出至数据驱动电路。数据驱动电路根据接收到的信号转换为驱动信号，输出至显示区域。
显示区域根据接收到的扫描驱动电路信号和数据驱动电路的驱动信号显示对应图像。
请参阅图5，图5是本发明驱动方法另一实施方式的流程图，本发明提供一种驱动方法，包括以下步骤：
S201：获得来自脉冲产生电路的PWM信号。
PWM信号为脉冲产生电路产生，进入步骤S202。
S202：将PWM信号展开成并列的多个PWM信号。
将从脉冲产生电路输出的PWM信号通过位移寄存器展开成并列多个的PWM信号，假如从脉冲产生电路输出的PWM信号含有5个脉冲信号，则经过位移寄存器展开成5条并列的PWM信号，进入步骤S203。
S203：将PWM信号整合成不同宽度的PWM信号。
将通过步骤S202处理的5条并列的PWM信号中的3条PWM信号通过或门子电路整合成3条不同宽度的PWM信号，请同时参阅图8，图8是本发明驱动方法一实施例的PWM信号通过或门子电路电压波形示意图。将通过步骤S202的并列的多个PWM信号中SR1、SR 2、SR 3信号整合成不同宽度的OR1、OR2、OR3信号，并传输至开关223，开关223包括薄膜场效应晶体管，或其他等效功能的元器件，开关223分别连接或门子电路222、Vcc（图未示）、充放电子电路224。
S204：对向数据驱动电路提供伽马参考电压的电容充放电。
以经过步骤S203处理的PWM信号控制开关开启与关闭，当PWM信号为高电压则透过Vcc对电容充电，当PWM信号为低电压时则停止充电；并当下一次要重新充电前，会先经放电信号将电容变成零，确保充电不会累积，进入步骤S205。
S205：稳定伽马参考电压。
用于为避免充电时伽马电压的电压错误，使用采样保持子电路225伽马参考电压稳定，并通过步骤S204的PWM信号的放电信号清空为数据驱动电路提供伽马参考电压的电容上的储存电压，进入步骤S206。
S206：输出伽马参考电压。
将稳定伽马参考电压输出至数据驱动电路。
下面通过一实施例中一完整周期为例对本发明的驱动方法做进一步的说明, 以一周期含有5个脉冲信号的PWM信号为例。
请参阅图6，图6是本发明驱动方法一实施例的PWM信号一完整周期电压波形示意图。
脉冲产生电路产生PWM信号，包含W_discharge、W1、W2、W3、W_sample，W1、W2、W3信号传输至位移寄存器，通过位移寄存器转换为并列的SR_discharge、SR1、SR 2、SR 3、SR _sample信号SR_discharge信号传输至充放电子电路和采样保持子电路，SR _sample信号传输至采用保持子电路，SR1、SR 2、SR 3信号通过或门子电路转换为OR1、OR2、OR3信号，以OR1、OR2、OR3信号控制薄膜场效应晶体管的开启和关闭，当OR1、OR2、OR3信号为高电压时，透过Vcc对向数据驱动电路提供伽马参考电压的电容充电，当为低电压时则停止对电容充电。
以上仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (7)

  1. 一种阵列基板，其中，所述阵列基板包括：
    具有多个显示像素单元的有效显示区域；
    设置于所述有效显示区域外，并为所述显示像素单元提供驱动信号的数据驱动电路；
    为所述数据驱动电路提供伽马参考电压的伽马电压产生电路，所述伽马电压产生电路输入来自脉冲产生电路TCon的PWM信号，并根据所述PWM信号得到所述伽马参考电压以输出至所述数据驱动电路；
    其中，所述阵列基板进一步包括连接所述伽马电压产生电路的所述脉冲产生电路，所述脉冲产生电路包括脉冲调制子电路，所述伽马电压产生电路与所述脉冲调制子电路相连；
    其中，所述伽马电压产生电路包括依序连接的位移寄存器、或门子电路、充放电子电路、采样保持子电路，进一步，所述位移寄存器还与所述充放电子电路、采样保持子电路相连，所述或门子电路与所述充放电子电路之间还串联一开关，所述开关还与电源相连，所述采样保持子电路与所述数据驱动电路相连，其中，所述位移寄存器具体用于将序列的PWM信号展开成并列的多个PWM信号，所述采样保持子电路具体用于稳定所述伽马参考电压，并输出至所述数据驱动电路，其中，所述伽马电压产生电路与所述驱动电路之间连接使用所述阵列基板上的薄膜场效应管代替或印刷在所述阵列基板上。
  2. 根据权利要求1所述的阵列基板，其中，所述采样保持子电路当所述伽马参考电压被重新设定时，清空为所述数据驱动电路提供的伽马参考电压。
  3. 根据权利要求1所述的阵列基板，其中，所述开关包括薄膜场效应晶体管。
  4. 一种显示设备，其中，所述显示设备包括脉冲产生电路和阵列基板，所述阵列基板包括具有多个显示像素单元的有效显示区域、设置于所述有效显示区域外并为所述显示像素单元提供驱动信号的数据驱动电路、为所述数据驱动电路提供伽马参考电压的伽马电压产生电路，其中，所述脉冲产生电路分别与所述数据驱动电路、所述伽马产生电路相连，所述伽马电压产生电路输入来自所述脉冲产生电路的PWM信号，并根据所述PWM信号得到所述伽马参考电压以输出至所述数据驱动电路。
  5. 一种驱动方法，其中，包括以下步骤：
    获得来自脉冲产生电路的PWM信号；
    根据所述PWM信号获得伽马参考电压；
    输出所述伽马参考电压至数据驱动电路，以驱动显示像素单元的显示。
  6. 根据权利要求5所述的驱动方法，其中，所述获得伽马参考电压的步骤包括：
    将序列的所述PWM信号展开成并列的多个PWM信号；
    将所述并列的PWM信号整合成不同宽度的PWM信号；
    将所述不同宽度的PWM信号为控制信号对作为提供所述伽马参考电压的电容进行充放电，当所述控制信号为高电压时则对所述电容充电，当为低电压时则停止充电，其中，下一次要对所述电容重新充电之前，先将所述电容上电荷量变成零，以确保充电不会累积；
    稳定所述伽马参考电压并输出至数据驱动电路。
  7. 根据权利要求6所述的驱动方法，其中，所述获得伽马参考电压的步骤进一步包括当所述伽马参考电压被重新设定时，清空所述伽马参考电压。
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