WO2015184694A1 - Dispositif et procédé de régulation de tension continue d'excitation, dispositif d'alimentation et panneau d'affichage - Google Patents

Dispositif et procédé de régulation de tension continue d'excitation, dispositif d'alimentation et panneau d'affichage Download PDF

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Publication number
WO2015184694A1
WO2015184694A1 PCT/CN2014/085864 CN2014085864W WO2015184694A1 WO 2015184694 A1 WO2015184694 A1 WO 2015184694A1 CN 2014085864 W CN2014085864 W CN 2014085864W WO 2015184694 A1 WO2015184694 A1 WO 2015184694A1
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WO
WIPO (PCT)
Prior art keywords
voltage
current
lead
display area
driving voltage
Prior art date
Application number
PCT/CN2014/085864
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English (en)
Chinese (zh)
Inventor
张林涛
刘铭
Original Assignee
京东方科技集团股份有限公司
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 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2015184694A1 publication Critical patent/WO2015184694A1/fr

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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the luminance of the organic light emitting diode is exponentially related to the DC driving voltage of the effective display area of the display panel, and thus is low gray.
  • the change in the luminance of the OLED is very sensitive to the change of the DC drive voltage.
  • the AMOLED panel In order to make the organic material emit light, a large current is consumed, and the power driving capability of the driving chip is weak, and the corresponding current cannot be supplied, and an independent DC voltage generating unit is required.
  • the DC driving voltage is transmitted from the DC voltage generating unit to the effective display area through the leads disposed outside the effective display area of the display panel.
  • the current on the lead can be estimated by the current consumption of the display on the display panel, and the current on the lead can be considered as the sum of the pixel currents.
  • the current on the lead is (Ired+Igreen-Iblue)xMxN, where Ired, Igreen, and Iblue are the current of the red sub-pixel, the current of the green sub-pixel, and the current of the blue sub-pixel, respectively, M is effective
  • M is effective
  • N is the number of rows of scan lines in the effective display area. Since the OLED display is self-illuminating technology, when the display panel displays a black screen, the current on the lead is the smallest, which is close to 0; and when the display panel displays a full white screen, the current on the lead is the largest, which is hundreds of mA. Therefore, the current on the lead ranges from 0 mA to hundreds of mA.
  • the resistance of the lead of the DC voltage generating unit to the effective display area is usually several ohms, so that the DC voltage drop generated by the DC voltage generating unit and the DC driving voltage transmitted to the effective display area is 0 to several. Hundred millivolts, so the lead The DC voltage drop causes a change in the DC drive voltage, which affects the uniformity of the display.
  • a main object of the present disclosure is to provide a DC driving voltage adjusting apparatus and method for making a display panel have a uniform DC driving voltage, thereby making the display panel display uniform.
  • the present disclosure provides a DC driving voltage adjusting device for adjusting a DC driving voltage of an effective display area of a display panel, the DC driving voltage being subtracted from a DC voltage generated by a DC voltage generating unit.
  • the DC driving voltage adjusting device includes:
  • the current acquisition unit, ⁇ obtains the current on the lead in real time
  • a voltage adjusting unit configured to adjust a DC voltage generated by the DC voltage generating unit according to the current or adjust a resistance of the lead wire so that the DC driving voltage does not change.
  • the voltage adjustment unit includes:
  • a voltage adjustment module configured to generate a voltage control signal according to the current, and transmit the voltage control signal to the DC voltage generating unit to control the DC voltage generating unit to generate a corresponding DC voltage, so that the DC driving voltage is not change.
  • the voltage adjustment unit includes:
  • a resistance adjustment module configured to adjust a resistance value of the digital adjustable resistor according to the current.
  • the current acquisition unit includes a current sensor or a current inductive resistor disposed on the lead.
  • the current acquiring unit includes:
  • a pixel brightness detecting module configured to detect brightness of all sub-pixels in the effective display area
  • a current acquiring module configured to obtain current on the lead according to brightness of all sub-pixels in the effective display area.
  • the current acquiring unit includes:
  • a temperature detecting module wherein the temperature of the display panel is detected
  • the current acquisition module, ⁇ obtains the current on the lead according to the temperature of the display panel.
  • the present disclosure also provides a DC driving voltage adjustment method for adjusting a DC driving voltage of an effective display area of a display panel, wherein the DC driving voltage is subtracted from a DC voltage generated by a DC voltage generating unit. The DC voltage drop on the lead wire outside the effective display area is obtained, and the DC driving voltage adjusting method includes:
  • Voltage adjustment step adjusting a DC voltage generated by the DC voltage generating unit according to the current or adjusting a resistance on the lead such that the DC driving voltage does not change.
  • the voltage adjusting step includes:
  • the voltage control signal is transmitted to the DC voltage generating unit, and the DC voltage generating unit is controlled to generate a corresponding DC voltage so that the DC driving voltage does not change.
  • the voltage adjusting step includes:
  • the resistance value of the digitally adjustable resistor disposed on the lead is adjusted correspondingly according to the current so that the DC driving voltage does not change.
  • the current obtaining step includes:
  • the current on the lead is obtained based on the brightness of all sub-pixels in the active display area.
  • the current obtaining step includes:
  • the current on the lead is obtained based on the temperature of the display panel.
  • the present disclosure also provides a power supply device including a DC voltage generating unit and the DC driving voltage adjusting device described above;
  • the DC voltage generating unit generates a DC voltage, and transmits the DC voltage to an effective display area through a lead disposed outside the effective display area of the display panel;
  • the DC voltage is subtracted from the DC voltage drop across the lead to the DC drive voltage of the active display area.
  • the present disclosure also provides a display panel including the above-described power supply device.
  • the DC driving voltage adjusting device and method, the power supply device and the display panel of the present disclosure obtain the current on the lead wire for transmitting the DC driving voltage outside the effective display area in real time, and adjust the current according to the magnitude of the current.
  • Describe the DC voltage generated by the DC voltage generating unit or adjust the The resistance on the lead wire is such that the DC driving voltage reaching the effective display area does not change regardless of what is displayed on the display panel, so that the effective display area has a uniform DC driving voltage, thereby making the display panel display uniform.
  • FIG. 1 is a schematic structural diagram of a DC driving voltage adjusting device according to an embodiment of the present disclosure
  • FIG. 2A is a schematic structural diagram of a DC driving voltage adjusting device according to still another embodiment of the present disclosure
  • FIG. 2B is still another embodiment of the present disclosure
  • FIG. 3 is a flowchart of a DC driving voltage adjusting method according to an embodiment of the present disclosure.
  • the DC driving voltage for driving the OLED in the effective display area of the display panel is transmitted from the DC voltage generating unit to the effective display area through the lead disposed outside the effective display area; the DC voltage generating unit generates a DC voltage, and the The DC voltage is transmitted to the effective display area through a lead disposed outside the effective display area of the display panel; the DC voltage minus the DC voltage drop on the lead is the DC drive voltage of the effective display area; since the current on the lead is based on The content displayed on the display panel changes in real time. Therefore, under the premise that the resistance of the lead is constant, the voltage drop on the lead is also changed in real time, which inevitably causes the DC driving voltage of the effective display area to also change accordingly.
  • the display panel is not evenly displayed.
  • the DC driving voltage adjusting device includes:
  • a current acquisition unit that acquires current on the lead in real time
  • a voltage adjusting unit configured to adjust a DC voltage generated by the DC voltage generating unit according to the current or adjust a resistance on the lead to make the DC driving voltage unchanged.
  • the present disclosure acquires a current on a lead wire transmitting a direct current driving voltage outside the effective display area in real time, adjusts a direct current voltage generated by the direct current voltage generating unit according to the magnitude of the current, or adjusts a resistance on the lead wire so that the display panel What is displayed, the DC drive voltage reaching the effective display area is unchanged, so that the effective display area has a uniform DC drive voltage, thereby making the display panel display uniform.
  • the voltage adjustment unit may include:
  • a voltage regulating module configured to generate a voltage control signal according to the current, and transmit the voltage control signal to a DC voltage generating unit to control the DC voltage generating unit to generate a corresponding DC voltage, thereby causing a DC driving to be transmitted to the effective display area
  • the voltage does not change.
  • a driving integrated circuit and a flexible circuit board are disposed on the periphery of the effective display area, the DC voltage generating unit adopts a DC/DC (Direct Current) converter, and the current acquiring unit uses a current sensor to mark The resistance of R is the resistance of the lead;
  • DC/DC Direct Current
  • the current sensor transmits the detected current I on the lead to the voltage regulating module, and the voltage adjusting module determines whether the DC voltage VDD outputted by the DC/DC converter needs to be adjusted according to the magnitude of the current I, so that The DC drive voltage VDDA is unchanged;
  • VDD-VDDR-fVDDA where VDDR is the voltage drop across the lead.
  • VDDR is the voltage drop across the lead.
  • the voltage adjustment unit may include: a digital adjustable resistor VR disposed on a lead between the DC voltage generating unit 10 and the effective display area AA';
  • a resistance adjusting module 122 configured to adjust a resistance value of the digital adjustable resistor VR according to the current, so that a DC driving voltage transmitted to the effective display area is unchanged;
  • the resistance labeled R is the resistance on the lead.
  • a driving integrated circuit and a flexible circuit board are disposed on the periphery of the effective display area, the DC voltage generating unit adopts a DC/DC (Direct Current-DC) converter, and the current acquiring unit uses a current sensor.
  • the resistance indicated as R is the resistance of the lead
  • the resistance indicated as VR is the digital adjustable resistance set on the lead
  • the voltage indicated as VDD is the DC voltage generated by the DC/DC converter
  • the current sensor transmits the current I on the detected lead to the resistance adjustment module, and the resistance adjustment module adjusts the resistance value of the digital adjustable resistor VR according to the current, And the DC driving voltage VDDA transmitted to the effective display area is unchanged;
  • VDD-VDDR+VDDA where VDDR is the voltage drop across the lead.
  • the current on the lead can be obtained by directly detecting the current on the lead, or indirectly by the brightness of the sub-pixel in the effective display area of the display panel or the temperature of the display panel.
  • the current acquisition unit may include a current sensor or a current sense resistor disposed on the lead.
  • the current acquisition unit may include:
  • a pixel brightness detecting module configured to detect brightness of all sub-pixels in the effective display area
  • a current acquiring module configured to obtain current on the lead according to brightness of all sub-pixels in the effective display area.
  • the current acquisition unit may further include:
  • a temperature detecting module wherein the temperature of the display panel is detected
  • a current acquisition module for obtaining a current on the lead according to a temperature of the display panel.
  • the current content of the effective display area of the display panel can be determined, and the signals transmitted by the image are digital signals, and the data constituting one pixel includes 8 components of R, G, and B of 8 bits.
  • the data constituting one pixel includes 8 components of R, G, and B of 8 bits.
  • “11111111” represents the highest brightness
  • "00000000” represents the lowest brightness
  • the middle data represents the different gray levels from 0 to 255.
  • the current required to display the image also has a corresponding relationship with the brightness of the pixel. When the pixel brightness is high, the current required to display the image is large, and when the pixel brightness is low, the current required to display the image is small, so the display on the effective display area can be counted.
  • the content of the image if there are many pixels with high brightness in the image, it is inevitable that the current required for display is large, and if there are many pixels with low brightness, the current required for display is small. Since the time and cost of accurate statistics are too large, an estimation method can be used, such as counting the number of pixels whose luminance is higher than 127 gray scale, that is, the data is larger than "10000000", and indirectly obtaining the lead according to the number of statistics. Current.
  • the pixels in the effective display area of the display panel emit light, a certain amount of heat is generated, and the amount of heat generated is proportional to the pixel consumption current. If the temperature of the panel can be monitored, it can also be accurate. Determine the current consumed by the panel. Therefore, one or more temperature sensors can be placed near the panel, and the magnitude of the current consumption of the display panel (ie, the current on the lead wire) is obtained according to the temperature measured by the sensors, and the current is fed back to the external DC voltage generating unit. To adjust the DC drive voltage.
  • the DC driving voltage adjusting method is applied to the voltage adjusting device, wherein the DC driving voltage is transmitted from the DC voltage generating unit to the effective display area through a lead disposed outside the effective display area;
  • the DC driving voltage adjustment method includes:
  • the current acquisition unit acquires the current on the lead in real time
  • Voltage adjustment step 32 The voltage adjustment unit adjusts the DC voltage generated by the DC voltage generating unit according to the current or adjusts the electric power ffi on the lead wire so that the DC driving voltage does not change.
  • the voltage adjustment step includes:
  • the voltage regulation module generates a voltage control signal according to the current
  • the DC voltage generating unit generates a corresponding DC voltage according to the voltage control signal such that the DC driving voltage does not change.
  • the voltage adjustment step includes:
  • the resistance adjusting module adjusts the resistance value of the digital adjustable resistor disposed on the lead according to the current, so that the DC driving voltage does not change.
  • the current obtaining step includes:
  • the pixel brightness detection module detects the brightness of all the sub-pixels in the effective display area; the current acquisition module obtains the current on the lead according to the brightness of all the sub-pixels in the effective display area.
  • the current obtaining step includes:
  • a temperature detecting module detects a temperature of the display panel
  • the current acquisition module obtains the current on the lead according to the temperature of the display panel.
  • the power supply device includes a DC voltage generating unit and the DC driving voltage adjusting device described above;
  • the DC voltage generating unit is configured to generate a DC voltage, and transmit the DC voltage to an effective display area through a lead disposed outside the effective display area of the display panel;
  • the DC voltage is subtracted from the DC voltage drop on the lead to the DC drive voltage of the effective display area;
  • the DC driving voltage adjusting device is configured to obtain a current on the lead in real time, and adjust the DC voltage according to the current or adjust a resistance of the lead so that the DC driving voltage does not change.
  • the display panel of the embodiment of the present disclosure includes the above-described power supply device.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

Dispositif et procédé de régulation de tension continue d'excitation, dispositif d'alimentation et panneau d'affichage. Une tension continue d'excitation est envoyée à une zone d'affichage utile par une unité génératrice 10 de tension continue via un conducteur qui est disposé à l'extérieur de la zone d'affichage utile du panneau d'affichage. Le dispositif de régulation de tension continue d'excitation comporte une unité d'acquisition de courant servant à acquérir le courant sur le conducteur en temps réel, et une unité de régulation de tension servant à réguler une tension continue générée par l'unité génératrice 10 de tension continue ou à réguler la résistance du conducteur en fonction du courant afin de maintenir inchangée la tension continue d'excitation. La zone d'affichage utile reçoit une tension continue d'excitation unifiée, et l'uniformité d'affichage du panneau d'affichage est ainsi assurée.
PCT/CN2014/085864 2014-06-04 2014-09-03 Dispositif et procédé de régulation de tension continue d'excitation, dispositif d'alimentation et panneau d'affichage WO2015184694A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410244887.9 2014-06-04
CN201410244887.9A CN104036727B (zh) 2014-06-04 2014-06-04 直流驱动电压调节装置及方法、供电装置和显示面板

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WO2015184694A1 true WO2015184694A1 (fr) 2015-12-10

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CN104036721B (zh) * 2014-05-15 2017-01-18 京东方科技集团股份有限公司 有机发光二极管显示面板及其驱动方法、显示装置
CN104464621B (zh) * 2014-11-14 2017-01-25 深圳市华星光电技术有限公司 补偿amoled电源压降的方法
TWI576804B (zh) * 2015-11-23 2017-04-01 友達光電股份有限公司 可調整驅動訊號的顯示器及其調整方法
CN105810172A (zh) * 2016-05-31 2016-07-27 京东方科技集团股份有限公司 显示驱动电路和显示装置
CN106448561B (zh) * 2016-10-21 2017-11-10 京东方科技集团股份有限公司 用于控制显示面板的el驱动电压的装置及方法
CN106816137B (zh) * 2017-04-13 2019-09-27 京东方科技集团股份有限公司 显示装置及增加该显示装置亮度均一性的方法
CN109493802B (zh) * 2017-09-12 2021-02-19 上海和辉光电股份有限公司 一种显示设备及其屏幕功耗控制方法
JP2019191327A (ja) * 2018-04-24 2019-10-31 シャープ株式会社 表示装置およびその駆動方法
CN112602148B (zh) * 2018-09-26 2022-08-16 深圳市柔宇科技股份有限公司 显示驱动方法及显示装置
DE112020006822T5 (de) * 2020-06-19 2022-12-29 Boe Technology Group Co., Ltd. Arraymodul und anzeigevorrichtung

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