WO2015172470A1 - Appareil et procédé de compensation d'une chute de tension continue d'une zone active d'un écran - Google Patents

Appareil et procédé de compensation d'une chute de tension continue d'une zone active d'un écran Download PDF

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Publication number
WO2015172470A1
WO2015172470A1 PCT/CN2014/086211 CN2014086211W WO2015172470A1 WO 2015172470 A1 WO2015172470 A1 WO 2015172470A1 CN 2014086211 W CN2014086211 W CN 2014086211W WO 2015172470 A1 WO2015172470 A1 WO 2015172470A1
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current
voltage
elvdd
display
display screen
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PCT/CN2014/086211
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English (en)
Chinese (zh)
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王颖
张林涛
刘铭
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京东方科技集团股份有限公司
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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
    • G09G3/22—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]

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  • the present invention relates to the field of active matrix organic light emitting diode (AMOLED) display technology, in particular, a device for compensating for an active area DC voltage drop (IR drop), having the compensation display screen
  • a display device for a DC voltage drop in an active region and a method for compensating for a DC voltage drop in an active region of the display screen are examples of active matrix organic light emitting diode (AMOLED) display technology.
  • IR drop active area DC voltage drop
  • the luminance of the organic light emitting diode is proportional to the driving current and proportional to the square of the driving voltage signal. Therefore, in the low gray scale display state, the luminance of the OLED is The change in the drive voltage signal is very sensitive.
  • the IR drop on the power signal line causes a change in the driving voltage signal of the OLED device, thereby affecting the uniformity of the display effect of the active area (AA) in the AMOLED display system, Compensation techniques are often introduced in backplane circuit design to compensate for OLED device drive voltage signals, where external compensation is a commonly used compensation method.
  • the external compensation uses a pixel circuit with compensation function and a customized driver chip to compensate the current or voltage of the active area of the display screen in the AMOLED display system.
  • the pixel circuit structure used is, for example, 3 transistors and 1 capacitor (3T1C) or 4 transistors and 2 capacitors (4T2C), etc., and the activation of the compensation mechanism often requires peripheral modules.
  • the circuit provides specific modules to complete.
  • the current range required for the illumination of the OLED device is from 0 mA to the black screen to hundreds of milliamps showing the pure white picture, and the independence is added.
  • the lead resistance of the DC-DC power supply to the active area is usually several ohms, so that the power supply voltage drop transmitted to the pixel unit of the active area of the display screen ranges from 0 to several hundred millivolts. Since the pixel unit display brightness of the OLED device is proportional to the square of the power supply voltage, the pixel unit display brightness of the OLED device is very sensitive to changes in the driving voltage signal in a low gray scale display state, and this voltage drop, that is, IR drop, causes The uneven display effect of the active area has a great influence on the display brightness of the active area.
  • the IR drop is related to the content of the screen display, the presence of the IR drop also makes it difficult to accurately set the value of the parameter ⁇ used by the display screen to characterize the distortion of the input signal by the output image.
  • the main object of the present invention is to provide a device for compensating the IR drop of the active area of the display screen, having the active area IR drop of the compensation display screen.
  • the display device of the device and the method for compensating the IR drop of the display active area are provided.
  • the present invention provides a device for compensating for a DC voltage drop in an active area of a display screen having an ELVDD (Electroluminescent Voltage Drain Drain) bus and a matrix of a plurality of pixel units in an active region.
  • ELVDD Electrode Voltage Drain Drain
  • the apparatus includes an input signal comparator coupled to the ELVDD lead, configured to detect current or voltage consumption of a current display picture on the ELVDD bus in real time, converting the detected current or voltage consumption into a digital signal; And configured to receive a digital signal from the input signal comparator, compare the received digital signal with a current or voltage consumption reference value of the current display screen, to obtain a current or voltage compensation value that needs to compensate for the current display screen; And a voltage signal modulating device coupled to the ELVDD lead, configured to receive a current or voltage compensation value from the processor, generate a compensation voltage based on the received current or voltage compensation value, and then feed the compensation voltage back to the ELVDD lead. In turn, a compensation voltage will be applied to each pixel cell through the ELVDD bus of the active region, thereby enabling external dynamic compensation of the DC voltage drop in the active region of the display screen.
  • the present invention provides a method for external dynamic compensation of a DC voltage drop in an active area of a display screen having an ELVDD bus in an active area And an array of pixel cells formed by a plurality of pixel units in a matrix form, each pixel unit being connected to the ELVDD bus, the ELVDD bus being connected to the driving integrated circuit through an ELVDD lead, the method comprising:
  • a compensation voltage is generated based on the current or voltage compensation value, which is then fed back to the ELVDD lead of the display.
  • the present invention provides a display device including a display screen and a device for compensating for a DC voltage drop in an active area of the display screen, wherein
  • the display screen has an ELVDD bus in the active area and a pixel unit array formed by a plurality of pixel units in a matrix form, each pixel unit is connected to the ELVDD bus, and the ELVDD bus is connected to the driving integrated circuit through an ELVDD lead;
  • the device for compensating the DC voltage drop of the active area of the display screen includes:
  • An input signal comparator coupled to the ELVDD lead, configured to detect current or voltage consumption of the current display picture on the ELVDD bus in real time, and convert the detected current or voltage consumption into a digital signal;
  • the processor is configured to receive the digital signal from the input signal comparator, compare the received digital signal with a current or voltage consumption reference value of the current display picture, to obtain a current or voltage compensation value that needs to compensate for the current display picture ;as well as
  • a voltage signal modulating device coupled to the ELVDD lead is configured to receive a current or voltage compensation value from the processor, generate a compensation voltage based on the received current or voltage compensation value, and then feed the compensation voltage back to the ELVDD lead.
  • the display signal outputted by the driver integrated circuit (IC) on the ELVDD lead of the display screen is detected in real time, and the compensation voltage fed back to the ELVDD lead of the display screen is adjusted according to the display signal, so that the active area of the display screen is What is displayed, the compensation voltage fed back to the ELVDD lead of the display can be changed according to the change of the display screen, and the external dynamic compensation of the DC voltage drop of the active area of the display screen is realized, so that the active area of the display screen is unified and stable.
  • the fixed ELVDD voltage which in turn effectively improves the display quality of the display system.
  • the judgment of whether the DC voltage drop of the active area of the display screen needs to be compensated can be directly judged based on the digital signal outputted by the driving IC of the display active area, and no digital simulation conversion is needed, and the process is realized. Simple and easy to implement.
  • the compensation for the IR drop of the active area of the display screen is to feed back the compensation voltage to the ELVDD lead of the display screen, and then to each pixel unit of the active area of the display screen through the ELVDD bus of the active area of the display screen.
  • the external dynamic compensation of the DC voltage drop in the active area of the display screen is realized, so the related circuit design of the signal sampling and the input of the compensation signal is relatively simple.
  • FIG. 1 is a schematic diagram of a display device including a display screen and means for compensating for a DC voltage drop in the active area of the display screen in accordance with an embodiment of the present invention.
  • FIG. 2 is a block diagram showing the structure of an input signal comparator in accordance with an embodiment of the present invention.
  • FIG. 3 is a circuit diagram of a pixel circuit employing an internal compensation method in the prior art.
  • 4a and 4b are luminance-voltage curves and current density-voltage curves, respectively, in accordance with an embodiment of the present invention.
  • FIG. 5 is an equivalent circuit diagram of a resistor network of an active region in accordance with an embodiment of the present invention.
  • FIG. 6 is a flow chart of a method for compensating for a DC voltage drop in an active area of a display screen in accordance with an embodiment of the present invention.
  • 1 display 2 input signal comparator, 3 processor, 4 voltage signal modulation device.
  • FIG. 1 is a schematic diagram of a display device including a display screen and a device for compensating for a DC voltage drop in an active area of a display screen, the display device including a display screen 1, an input signal comparator 2, in accordance with an embodiment of the present invention.
  • a display screen 1 is used to display a picture, including an ELVDD bus, a pixel unit array composed of a plurality of pixel units in a matrix form, ELVDD leads a and a', a fanout area s, a driver IC, and a soft Flexible Print Circuit (FPC), and line drive circuit (GOA) and electrostatic protection (ESD) circuits around the active area.
  • the active area (AA') is also referred to as a pixel area, and is an area where the ELVDD bus and the pixel unit array are located, and a plurality of pixel units constituting the pixel unit array are connected to the ELVDD bus, and the ELVDD bus is an external power source. The supplied voltage is traced inside the display.
  • the ELVDD bus is connected to the driver IC through the ELVDD pin.
  • the active area is connected to the driver IC through the Fanout area s.
  • the Fanout area s is between the driver IC and the ELVDD bus of the active area.
  • the area where the lead is located, the GOA circuit is used to provide a line scan signal for the pixel unit, and the static electricity protection circuit is used for electrostatic protection of various signal lines on the display screen.
  • the input signal comparator 2 detects the current or voltage consumption of the current display picture on the ELVDD bus in real time, and converts the detected current or voltage consumption into a digital signal.
  • the processor 3 receives the digital signal from the input signal comparator 2, compares the received digital signal with the current or voltage consumption reference value of the current display picture, and obtains a current or voltage compensation value that needs to compensate for the current display picture.
  • the voltage signal modulating device 4 receives a current or voltage compensation value from the processor 3, generates a compensation voltage according to the received current or voltage compensation value, and then feeds the compensation voltage to the ELVDD lead of the display 1, and then passes through the ELVDD of the display 1.
  • a bus is applied to each pixel unit to achieve external dynamic compensation of the DC voltage drop in the active area of the display.
  • the current or voltage consumption of the current display picture on the ELVDD bus is equal to the sum of the current or voltage consumption of each pixel cell in the active region under the current display picture.
  • the input signal comparator 2 calculates the sum of the current or voltage consumption of each pixel unit under the current display screen as the current or voltage consumption of the current display picture on the ELVDD bus.
  • the processor 3 may have a random access memory (RAM) in which is stored a lookup table configured in advance based on an input signal on the ELVDD lead, the lookup table including at least an input signal on the ELVDD lead and a current display picture current or voltage Consumes the mapping between benchmark values.
  • the input signal on the ELVDD lead is from the driver IC of display 1 Displaying a signal, calculating a gray value of each pixel unit in an ideal case according to the display signal, and then calculating a current or voltage value consumed by each pixel unit in an ideal case according to the gray value, and the sum of the current or voltage values is
  • the current display picture current or voltage consumption reference value is used to obtain a mapping between the input signal and the current display picture current or voltage consumption reference value.
  • the current or voltage compensation value that needs to compensate for the current display picture is the difference between the current or voltage consumption detected by the input signal comparator 2 in real time and the current display picture current or voltage consumption reference value.
  • the input signal comparator detects the current consumption of the current display picture on the ELVDD bus in real time, and details the embodiment below. Description.
  • the OLED display is self-illuminating technology
  • the pixel current is the smallest, close to 0, and the current consumed on the ELVDD bus of the display 1 is also minimized.
  • the full white screen is displayed, the pixel current is the largest, and the current consumed on the ELVDD bus of the display 1 is also the largest. Therefore, when the input signal comparator 2 detects the current consumption of the display screen of the display screen 1, when the display screen 1 displays different gray scale pictures, the compensation voltages fed back to the display screen 1 by the voltage signal modulation means 4 are different.
  • the digital signal, at this time, the schematic diagram of the input signal comparator is shown in FIG. 2.
  • FIG. 2 is a schematic structural diagram of the input signal comparator in one embodiment of the present invention, wherein "b7b6b5b4b3b2b1b0" is 8-bit display data, "10000000” "For the reference data of the input signal comparator, when the input "b7b6b5b4b3b2b1b0" is "10000000", that is, when the input signal is the display data of the 128th gray level, the input signal comparator output is logic "1", that is, The detected current consumption is converted to a digital signal and output to the processor. It should be noted that, because the system resources required for accurate compensation are relatively large, in general, only display data higher than 127 gray scales can be counted, thereby only compensating for high gray scale data.
  • the processor 3 After receiving the digital signal output by the input signal comparator 2, the processor 3 sends the digital signal The number is compared with the current consumption reference value of the current display picture stored in the RAM, and the difference between the two is a current compensation value that needs to compensate for the current display picture, and then the current compensation value is output to the voltage signal modulation device 4 .
  • the voltage signal modulating device 4 generates a compensation voltage according to the current compensation value received from the processor 3, and then feeds the compensation voltage to the ELVDD lead of the display screen, and then applies to each pixel unit through the ELVDD bus of the display screen to realize the display. External dynamic compensation of DC voltage drop in the active area of the screen.
  • the internal compensation method is to introduce a compensation signal into the pixel circuit.
  • This internal compensation method can accurately compensate for each pixel and achieve better compensation effect.
  • the pixel circuit that can realize this compensation mode is shown in FIG.
  • this internal compensation method requires a compensation circuit with ELVDD compensation function in the pixel circuit, resulting in a pixel circuit generally having at least 3 or more thin film field effect transistor (TFT) devices, and for high resolution
  • TFT thin film field effect transistor
  • the external compensation mode is to compensate the active area of the display screen, that is, to perform voltage compensation on the ELVDD bus of the display screen, and directly improve the power supply level of the entire active area ELVDD bus.
  • This compensation mode has a simple circuit structure for each The pixels do not add extra design, and have high practical value for the design of high-resolution display backplane.
  • an external compensation method is adopted.
  • the processor 3 calculates the current value to be compensated when the picture currently displayed on the display screen needs to be compensated, and the processor 3 calculates the current value to be compensated by using a lookup table.
  • the lookup table includes at least a mapping relationship between an input signal on the ELVDD lead and a current display picture current consumption reference value.
  • the input signal on the ELVDD lead is a display signal from the driving integrated circuit of the display screen 1.
  • the processor 3 calculates the gray value of each pixel unit in the active area of the display screen according to the display signal according to the design, and then The current value consumed by each pixel unit in an ideal case is calculated based on the gradation value, and the sum of the current values is the current display picture current consumption reference value.
  • the current compensation value required to compensate for the current display picture is the difference between the current consumption detected by the input signal comparator 2 and the current display picture current consumption reference value.
  • the specific value of the information in the lookup table is according to the actual situation. For calculations, the calculation is based on the luminance-current-voltage operating curve of the OLED device, ie the IVL curve of the OLED. 4a and 4b show luminance-voltage curves and current density-voltage curves, respectively, in an embodiment of the present invention.
  • Rh is the resistance of the horizontal power supply signal line
  • R h ⁇ (W / L)
  • ⁇ is the sheet resistance of the layer wiring metal
  • W is the line width
  • L is the line length
  • R v is the resistance of the power signal line in the vertical direction
  • R v ⁇ (W / L)
  • ⁇ is the sheet resistance of the layer wiring metal
  • W is the line width
  • L is the line length
  • each OLED device can be equivalent to an ideal current source connected in series at the intersection of the line scan signal and the column scan surface signal.
  • the current signal size of the ideal current source corresponds to the specific brightness of the OLED device during illumination.
  • the current value, I r represents the current value of the red sub-pixel
  • I g is the current value of the green sub-pixel
  • I b is the current value of the blue sub-pixel, and the most serious position of the IR drop occurs when the full white screen is displayed.
  • the voltage value of the IR drop at the center of the active area at the full white screen can be used as the compensation voltage value of ELVDD.
  • IR is the compensation voltage.
  • the processor 3 can be implemented by using a programmable gate array (FPGA), an IC chip or other controller device, and the voltage signal modulation device 4 can be implemented by a DC-DC power supply.
  • FPGA programmable gate array
  • the voltage signal modulation device 4 can be implemented by a DC-DC power supply.
  • FIG. 6 illustrates the compensation of the DC voltage drop of the active area of the display screen according to an embodiment of the present invention.
  • Method flow diagram the method comprising the following steps:
  • Step 1 Real-time detection of the current or voltage consumption of the current display screen on the ELVDD bus of the display active area, and converting the detected current or voltage consumption into a digital signal;
  • Step 2 comparing the digital signal with a current or voltage consumption reference value of the current display screen to obtain a current or voltage compensation value that needs to compensate for the current display screen;
  • Step 3 Generate a compensation voltage according to the current or voltage compensation value, and then feed the compensation voltage to the ELVDD lead of the display, and then apply to each pixel single through the ELVDD bus. Element, to achieve external dynamic compensation of the DC voltage drop in the active area of the display.
  • the current or voltage consumption of the current display screen in the active area ELVDD bus of the display screen in step 1 is equal to the sum of the current or voltage consumption of each pixel unit in the active area under the current display screen, and the current display screen is displayed in real time.
  • the current or voltage consumption on the ELVDD bus of the active area of the screen is calculated by calculating the sum of the current or voltage consumption of each pixel unit under the current display screen. This step can be implemented, for example, by a comparator.
  • Step 2 may be implemented, for example, by a processor having a random access memory having a lookup table configured in advance based on an input signal on an ELVDD lead, the lookup table including at least an input signal and a current display picture current or voltage Consumes the mapping between benchmark values.
  • the input signal on the ELVDD lead is a display signal from a driving integrated circuit of the display screen, and the processor calculates a gray value of each pixel unit in an ideal case according to the display signal, and then calculates the gray value according to the gray value.
  • the current or voltage value consumed by each pixel unit, the sum of the current or voltage values is the current display picture current or voltage consumption reference value.
  • the processor compares the received digital signal with a current or voltage consumption reference value of a current display picture stored in the self-random memory to obtain a current or voltage compensation value that needs to compensate for the current display picture, the current or voltage compensation value. Is the difference between the current or voltage consumption detected by the input signal comparator in real time and the current display picture current or voltage consumption reference value.
  • Step 3 can be implemented, for example, by a voltage signal modulator.
  • a method of compensating for a DC voltage drop in an active area of a display screen in accordance with an embodiment of the present invention may be implemented by circuitry of other constructions.
  • the comparator, processor, and modulator can be combined into fewer, for example, one or two units, or can be re-divided into more units, again compensating for DC voltage drop in the active area of the display screen.
  • the random access memory storing the lookup table can be other types of memory or present external to the processor and can be read by the processor.
  • the apparatus and method for compensating the DC voltage drop of the active area of the display screen and the display apparatus including the same provided by the present invention detect the display signal input by the driving IC on the ELVDD lead of the display screen in real time. And adjusting the compensation voltage fed back to the ELVDD lead of the display according to the display signal, so that the compensation voltage fed back to the ELVDD lead of the display can be changed according to the change of the display screen regardless of what is displayed in the active area of the display screen.
  • the external dynamic compensation of the IR drop of the display active area is realized, so that the display active area has a uniform and stable ELVDD voltage, thereby effectively improving the display quality of the display system.
  • the input signal comparator detects the current consumption of the current display screen on the ELVDD bus of the display active area, and the processor compares the received digital signal with the current consumption reference value of the current display screen to obtain A current compensation value that requires compensation for the current display screen.
  • the real-time detection by the input signal comparator may also be the voltage consumption of the current display screen on the ELVDD bus of the display active area, and the processor compares the received digital signal with the voltage consumption reference value of the current display screen. A voltage compensation value that requires compensation for the current display screen is obtained.

Abstract

L'invention concerne un appareil et un procédé de compensation d'une chute de tension continue d'une zone active d'un écran. Ledit appareil comprend : un comparateur de signaux d'entrée conçu pour détecter en temps réel la consommation de courant ou de tension actuelle d'un panneau d'affichage sur un bus ELVDD, et la convertir en signal de données ; un processeur destiné à recevoir le signal de données et à le comparer à une valeur de référence de la consommation de courant ou de tension actuelle du panneau d'affichage afin d'obtenir une valeur de compensation de courant ou de tension nécessaire pour effectuer une compensation dudit panneau d'affichage ; et un dispositif de modulation de signal de tension servant à recevoir la valeur de compensation de courant ou de tension, et, sur la base de cette valeur, générer une tension de compensation, puis renvoyer cette tension de compensation à un fil conducteur d'ELVDD. La tension de compensation du fil conducteur d'ELVDD renvoyée à l'écran peut changer en fonction des changements du panneau d'affichage, permettant ainsi la mise en œuvre d'une compensation dynamique externe d'une chute de tension continue d'une zone active dudit écran, ce qui améliore nettement la qualité d'affichage du système d'affichage.
PCT/CN2014/086211 2014-05-12 2014-09-10 Appareil et procédé de compensation d'une chute de tension continue d'une zone active d'un écran WO2015172470A1 (fr)

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CN201410199019.3A CN103996374B (zh) 2014-05-12 2014-05-12 外部动态补偿显示屏有源区直流电压降的装置及方法

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CN109147667A (zh) * 2018-09-21 2019-01-04 京东方科技集团股份有限公司 电压补偿装置及方法、阵列基板、显示装置
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CN109830207A (zh) * 2019-03-27 2019-05-31 京东方科技集团股份有限公司 电致发光显示面板的调整方法及装置
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