WO2017031929A1 - 有源矩阵有机发光二极管显示装置及其亮度补偿方法 - Google Patents

有源矩阵有机发光二极管显示装置及其亮度补偿方法 Download PDF

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WO2017031929A1
WO2017031929A1 PCT/CN2016/070744 CN2016070744W WO2017031929A1 WO 2017031929 A1 WO2017031929 A1 WO 2017031929A1 CN 2016070744 W CN2016070744 W CN 2016070744W WO 2017031929 A1 WO2017031929 A1 WO 2017031929A1
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sub
pixel
brightness
pixels
compensation
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PCT/CN2016/070744
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English (en)
French (fr)
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宋丹娜
吴仲远
曾思衡
孟松
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京东方科技集团股份有限公司
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Priority to US15/307,611 priority Critical patent/US10204557B2/en
Priority to EP16788406.3A priority patent/EP3343549B1/en
Publication of WO2017031929A1 publication Critical patent/WO2017031929A1/zh

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    • 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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Definitions

  • Embodiments of the present invention relate to an active-matrix organic light emitting diode (AMOLED) display device and a brightness compensation method thereof.
  • AMOLED active-matrix organic light emitting diode
  • An active-matrix organic light emitting diode (AMOLED) display device is a self-luminous component based on an organic light emitting diode (OLED).
  • OLED organic light emitting diode
  • the principle of OLED illumination is that organic semiconductor materials and luminescent materials undergo carrier injection and recombination under the electric field to emit light.
  • AMOLED display devices are expected to be more widely used due to their high brightness, clear picture quality, ultra-thin thickness and good display performance.
  • An AMOLED display device is composed of thousands of pixels, each of which includes an OLED and a pixel circuit for driving the OLED.
  • the pixel circuit is composed of a thin film transistor (TFT), a capacitor, and a driving TFT.
  • the switching TFT charges a voltage corresponding to the data signal to the capacitor, and the driving TFT adjusts the magnitude of the current supplied to the OLED according to the voltage of the capacitor, and the amount of luminescence of the OLED is proportional to the current, thereby adjusting the brightness of the OLED.
  • Chinese Patent No. CN102968954A discloses an AMOLED display device capable of quickly sensing the current of each pixel in order to compensate for the luminance deviation between pixels and a method of sensing the pixel current thereof.
  • the above patent utilizes a parasitic capacitance (ie, a line capacitance) on a display line (such as a reference line, a data line, or a first power line as a current sensing line), so that the current of the driving TFT charges the parasitic capacitance.
  • Input the charged voltage into an analog-to-digital converter (ADC) module, and calculate the pixel power using the formula I Cx(V2-V1)/(t2-t1). flow.
  • ADC analog-to-digital converter
  • the capacitance of each column line on the display may be different; and there is an error in the conversion of the ADC module in the integrated circuit for each channel, which affects the current sensing. Therefore, the brightness deviation compensation of the pixel is not accurate.
  • Embodiments of the present invention provide an active matrix organic light emitting diode (AMOLED) display device including a display panel including a plurality of sub-pixels, each of the sub-pixels including an organic light emitting diode (OLED) and Independently driving the pixel circuit of the OLED, the AMOLED display device further includes: a driving chip configured to output a corresponding data voltage to each of the sub-pixels, and acquire an induced voltage corresponding to each of the sub-pixels; a controller (TCON) configured to adjust an initial data voltage outputted by the driving chip to each sub-pixel in an initial compensation phase to obtain an actual value of each sub-pixel under the condition that the brightness parameter value of the display panel is a set value Displaying a data voltage compensation value corresponding to the brightness uniformity, and controlling the driving chip to output the first data voltage to the pixel circuit corresponding to each sub-pixel according to the data voltage compensation value corresponding to each sub-pixel, and acquiring the current data through the driving chip
  • the brightness parameter includes gray scale or display brightness.
  • the data voltage compensation value corresponding to any one of the sub-pixels includes the sub-pixels when the actual display brightness of each sub-pixel is uniform. a first data voltage; or a difference or a proportional value of the first data voltage and an initial data voltage output by the driving chip to the any of the sub-pixels.
  • the driving chip includes a number An analog conversion (DAC) module and an analog to digital conversion (ADC) module; the DAC module configured to output respective data voltages to respective sub-pixels; the ADC module configured to detect an induced voltage corresponding to each sub-pixel.
  • DAC analog conversion
  • ADC analog to digital conversion
  • the induced voltage corresponding to any one of the sub-pixels charges the line capacitance of the driving thin film transistor TFT in the pixel circuit of any one of the sub-pixels Voltage.
  • the TCON is further configured to utilize any of the sub-pixels for any sub-pixel when the brightness parameter value of the display panel is not equal to the set value at any time.
  • the TCON is further configured to utilize any of the sub-pixels for any sub-pixel when the brightness parameter value of the display panel is not equal to the set value at any time.
  • Performing interpolation calculation on at least two sets of standard reference data related at a time calculating a data voltage that needs to be output to the pixel circuit corresponding to any one of the sub-pixels at any one time, and controlling the driving chip to be driven according to the calculated data voltage a pixel circuit corresponding to any one of the sub-pixels; wherein each set of standard reference data associated with the any one of the moments includes: a corresponding set value, and, at any one of the moments, when the brightness of the display panel When the parameter value is the corresponding set value, the induced voltage corresponding to any one of the sub-pixels is equal to the data voltage at the initial reference voltage associated with the corresponding set value and the
  • Embodiments of the present invention also provide a luminance compensation method for an active matrix organic light emitting diode (AMOLED) display device, including: in an initial compensation phase, an initial controller (TCON) adjusts an initial output of a driving chip to each sub-pixel.
  • TCON initial controller
  • the data voltage is obtained, and the value of the brightness parameter of the display panel is obtained under the condition that the actual display brightness of each sub-pixel is uniform and the data voltage compensation value corresponding to each sub-pixel is uniform, and the driving chip is controlled according to each sub-pixel.
  • the data voltage compensation value outputs a first data voltage to the pixel circuit corresponding to each sub-pixel, and the induced voltage corresponding to each sub-pixel is obtained by the driving chip, and each induced voltage is used as the brightness parameter of the display panel.
  • the value is the initial reference voltage corresponding to each sub-pixel under the set value condition; in the subsequent compensation phase, the timing controller TCON changes the data voltage outputted by the driving chip to each sub-pixel to make the brightness of the display panel
  • the induced voltage corresponding to each sub-pixel is equal to the brightness of the display panel.
  • the initial reference voltage corresponding to each sub-pixel is used to achieve brightness uniformity compensation of each sub-pixel in the subsequent compensation phase; wherein the actual display brightness of each sub-pixel is measured by the image sensor of.
  • the luminance parameter includes grayscale or display luminance.
  • the data voltage compensation value corresponding to any one of the sub-pixels includes the sub-pixels when the actual display brightness of each sub-pixel is uniform. a first data voltage; or a difference or a proportional value of the first data voltage and an initial data voltage output by the driving chip to the any of the sub-pixels.
  • the induced voltage corresponding to any one of the sub-pixels charges the line capacitance of the driving thin film transistor TFT in the pixel circuit of the any sub-pixel. Voltage.
  • the method further includes: using any of the sub-pixels for any sub-pixel when the brightness parameter value of the display panel is not equal to the set value at any time Interpolating at least two sets of standard reference data related to the time, calculating a data voltage that needs to be output to the pixel circuit corresponding to any one of the sub-pixels at any one of the times, and controlling the driving chip to drive the data according to the calculated data voltage a pixel circuit corresponding to any sub-pixel; wherein each set of standard reference data associated with the any one of the moments includes: a corresponding set value, and, at any one of the moments, a brightness parameter of the display panel When the value is the corresponding set value, the induced voltage corresponding to any one of the sub-pixels is equal to the data voltage when the initial reference voltage associated with the corresponding set value and the any of the sub-pixels is .
  • FIG. 1 is a schematic structural diagram of an AMOLED display device according to an embodiment of the present invention.
  • FIG. 2 is a schematic flow chart of a method for compensating for brightness of the AMOLED display device according to an embodiment of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • Embodiment 1 of the present invention provides an AMOLED display device.
  • 1 is a schematic structural diagram of an AMOLED display device according to Embodiment 1 of the present invention.
  • the AMOLED display device includes a display panel 11, a timing controller (TCON) 12, and a driving chip 13, wherein:
  • the display panel 11 includes a plurality of sub-pixels (eg, each sub-pixel is defined by a lateral gate line and a longitudinal data line crossing each other in the drawing), each sub-pixel including an OLED and a pixel circuit for independently driving the OLED; the pixel
  • the circuit may include, for example, a device such as a drive transistor, a switching transistor, a capacitor, or the like. OLED devices can emit white light or monochromatic light such as red, green and blue.
  • the driving chip 13 can be configured to output a corresponding data voltage to each sub-pixel, and acquire an induced voltage corresponding to each sub-pixel;
  • the initial data voltage outputted by the driving chip 13 to each sub-pixel is adjusted by the TCON 12, and the value of the brightness parameter of the display panel is obtained under the condition that the actual display brightness of each sub-pixel is uniform and uniform.
  • the induced voltage corresponding to each sub-pixel, and the value of each induced voltage as the brightness parameter of the display panel is the initial reference voltage corresponding to each sub-pixel under the set value condition; and, in subsequent compensation
  • the induced voltage corresponding to each sub-pixel is equal to that on the display panel.
  • the brightness parameter takes the initial reference voltage corresponding to each sub-pixel when the set value is used, so as to implement each of the subsequent compensation stages.
  • Luminance uniformity compensation of sub-pixels wherein the actual display brightness of each sub-pixel can be measured, for example, by an image sensor, such as a charge coupled device (CCD) (ie, taking pictures of the display screen using a CCD to measure each sub-pixel Actual display brightness).
  • CCD charge coupled device
  • the actual display brightness of each sub-pixel can also be measured using a complementary metal oxide semiconductor (CMOS) imaging device or the like.
  • CMOS complementary metal oxide semiconductor
  • the TCON 12 and the driver chip 13 and the like can be realized by corresponding circuits or sub-circuits.
  • each sub-pixel can perform luminance compensation with the initial reference voltage as a reference value.
  • the initial reference voltage corresponding to each sub-pixel has been verified by the CCD measurement (ie, optical compensation has been performed)
  • the error of the line capacitance and the error between the chip channels still exist, Does not have any effect on pixel brightness compensation.
  • each sub-pixel can perform luminance compensation with the initial reference voltage as a reference value.
  • uniform compensation is achieved, so that the problem of inaccurate pixel luminance offset compensation caused by the error between the column-line capacitance error and the chip channel can be solved. Improve the uniformity and accuracy of initial and subsequent compensation.
  • the brightness parameter can include grayscale or display brightness.
  • the initial data voltage outputted by the driving chip 13 to each sub-pixel can be adjusted by the TCON 12 to obtain the grayscale of the display panel as a set value (such as 64 gray scale, 128 gray scale, 192 gray scale or 255 gray scale). Etc.), or display brightness as a set value (such as maximum brightness, 1/2 maximum brightness, 1/4 maximum brightness or 1/8 maximum brightness, etc., wherein the highest brightness of the display panel can be determined based on the actual situation of the display panel itself When the actual display brightness of each sub-pixel is uniform, the data voltage compensation value corresponding to each sub-pixel is uniform.
  • the luminance difference values of the actual display luminances of any two sub-pixels are within the set error tolerance range (for example, when the deviation is less than 5%), the actual display of each sub-pixel can be considered.
  • the brightness is uniform and the details are not described in the embodiment of the present invention.
  • the data voltage compensation value corresponding to any one of the sub-pixels may be the first data voltage of any one of the sub-pixels when the actual display brightness of each sub-pixel is uniform; A difference or a proportional value of the first data voltage and an initial data voltage output by the driving chip 13 to the any of the sub-pixels.
  • the value of the brightness parameter of the display panel is a set value, for any sub-pixel, when the actual display brightness of each sub-pixel is uniform, the actual data voltage of the sub-pixel is used as the sub-pixel.
  • Corresponding data voltage compensation value the actual data voltage when the actual display brightness of each sub-pixel is uniform, the difference or the proportional value of the initial data voltage of the sub-pixel, etc. may be used as the sub-pixel
  • the data voltage compensation value is used to increase the diversity and flexibility of the data voltage compensation value.
  • the data voltage compensation value corresponding to each sub-pixel when the actual display brightness of each sub-pixel is uniform is obtained, for example, the TCON 12 is further
  • the set brightness parameter value of the display panel and the data voltage compensation value of each sub-pixel may be stored for subsequent use by the driver chip 13 to output the first data voltage to the pixel circuit corresponding to each sub-pixel.
  • These data are stored, for example, in a memory independent of TCON 12 or in a memory integrated in TCON 12, which may be of various types, such as volatile or non-volatile memory.
  • the TCON 12 can also store, for example, the value of the set brightness parameter of the display panel and the initial reference voltage corresponding to each sub-pixel, so as to be used in the subsequent compensation stage, which is implemented by the present invention. This example will not be described in detail.
  • the set value may be any value, that is, a value for any set brightness parameter (such as any set gray scale or any setting)
  • the brightness of the display can be compensated in the following manner: In the initial compensation phase, by adjusting the initial data voltage outputted by the driving chip 13 to each sub-pixel, the brightness parameter value on the display panel is the setting. Under the condition of the value, the data voltage compensation value corresponding to each sub-pixel when the actual display brightness of each sub-pixel is uniform is obtained, and the driving chip 13 is controlled to correspond to each sub-pixel according to the data voltage compensation value corresponding to each sub-pixel.
  • the pixel circuit outputs the first data voltage, and the driving chip 13 obtains the induced voltage corresponding to each sub-pixel at this time, and uses each induced voltage as the brightness parameter value of the display panel as the set value.
  • the initial reference voltage corresponding to the pixel; and, in the subsequent compensation phase, the brightness of the display panel is changed by changing the data voltage outputted by the driving chip 13 to each sub-pixel
  • the induced voltage corresponding to each sub-pixel is equal to the initial reference voltage corresponding to each sub-pixel when the value of the brightness parameter of the display panel is the set value, to achieve subsequent The brightness uniformity compensation of each sub-pixel in the compensation phase.
  • the TCON 12 may only take values (such as 2 or 3, etc.) for the set brightness parameters, according to the above.
  • the method performs brightness compensation to obtain a plurality of sets of standard reference data, and for other brightness parameter values, the data voltage corresponding to each sub-pixel can be obtained by performing interpolation operation based on the plurality of sets of standard reference data to achieve brightness compensation.
  • the TCON 12 can also be used at any time, when it is determined that the brightness parameter value of the display panel is not equal to the set value (ie, is not a set value), for any sub-pixel, utilize and time Performing interpolation calculation on at least two sets of standard reference data, and calculating data to be output to the pixel circuit corresponding to any one of the sub-pixels at the time (when the value of the brightness parameter of the display panel is not a set value) Voltage, and controlling the driving chip 13 to drive the pixel circuit corresponding to any one of the sub-pixels according to the calculated data voltage;
  • Each set of standard reference data associated with any of the moments may include: a corresponding set value, And at any one of the times, when the brightness parameter value of the display panel is the corresponding set value, the induced voltage corresponding to the any sub-pixel is equal to the corresponding set value and the The data voltage at the initial reference voltage associated with a sub-pixel.
  • the number of standard reference data referenced when performing interpolation calculation can be flexibly set according to actual conditions. For example, when the brightness uniformity compensation requirement for the display device is higher, the number of reference standard reference data groups can be increased; when the brightness uniformity compensation requirement for the display device is lower, the reference standard reference data is The number of groups can be less, which is not limited in this embodiment.
  • the standard reference data referenced when performing the interpolation operation is usually a brightness parameter attribute with the non-set value (eg, gray scale It is also the standard reference data showing the same set value of brightness).
  • the standard reference data referred to when performing the interpolation operation may generally be a standard corresponding to the set 64 gray scale, 128 gray scale, and the like. The reference to the data is not described in detail in the embodiments of the present invention.
  • the interpolation operation is performed for any sub-pixel.
  • the standard reference data associated with any of the times may be obtained in real time by the TCON 12.
  • the two actions of display and sensing may be set to be time-sharing.
  • the time of one frame can be divided into two parts, one part is used to sense the data voltage of each sub-pixel when the brightness parameter value of the display panel is the set value, and the other part is used according to the actual brightness parameter value of the display panel (ie Non-set value) is displayed accordingly.
  • This embodiment of the present invention does not describe this.
  • the driving chip 13 described in the embodiment of the present invention may include, for example, a DAC (Digital to Analog Conversion) module and an ADC (Analog to Digital Conversion) module.
  • DAC Digital to Analog Conversion
  • ADC Analog to Digital Conversion
  • the DAC module can be configured to output a corresponding data voltage to each sub-pixel; for example, in an initial compensation phase, the DAC module can output a corresponding first to a pixel circuit corresponding to each sub-pixel according to the control of the TCON 12 Data voltage
  • the ADC module can be configured to detect an induced voltage corresponding to each sub-pixel; for example, in an initial compensation phase, the ADC module can detect, according to the control of the TCON 12, a data voltage compensation value corresponding to each sub-pixel of the driving chip. Outputting the first to the pixel circuit corresponding to each sub-pixel The induced voltage corresponding to each sub-pixel when the data voltage is applied.
  • the induced voltage corresponding to any one of the sub-pixels may generally be a voltage at which a TFT (drive thin film transistor) in the pixel circuit of any one of the sub-pixels charges the line capacitance, which is used in the embodiment of the present invention. Do not repeat them.
  • the first embodiment of the present invention provides an AMOLED display device.
  • the AMOLED display device may include a timing controller (TCON) and a driving chip.
  • the timing controller (TCON) can be used to adjust the actual display brightness of each sub-pixel under the condition that the brightness parameter value of the display panel is set value under the initial compensation stage by adjusting the initial data voltage outputted by the driving chip to each sub-pixel.
  • the data voltage compensation value corresponding to each sub-pixel is uniform, and the driving chip outputs the first data voltage to the pixel circuit corresponding to each sub-pixel according to the data voltage compensation value corresponding to each sub-pixel, and is obtained by the driving chip.
  • the induced voltage corresponding to each sub-pixel, and each induced voltage is used as the brightness parameter value of the display panel as the set value, the initial reference voltage corresponding to each sub-pixel; and, in the subsequent compensation stage
  • the data voltage outputted by the driving chip to each sub-pixel is changed such that the brightness parameter value of the display panel is the set value
  • the induced voltage corresponding to each sub-pixel is equal to the brightness parameter value of the display panel.
  • Set the initial reference voltage corresponding to each sub-pixel to set the brightness of each sub-pixel in the subsequent compensation phase. Uniformity compensation.
  • the actual display brightness of each sub-pixel is measured by CCD.
  • the parasitic capacitance ie, line capacitance
  • the conversion error of the ADC module for each channel Still exists, that is, the error of the line capacitance and the error between the chip channels still exist, but since the initial reference voltage corresponding to each sub-pixel has been verified by, for example, CCD measurement, the pixel brightness compensation is not affected, and each sub-pixel can be The initial reference voltage is used as a reference value for luminance compensation.
  • interpolation may be performed based on the plurality of sets of related standard reference data to obtain a data voltage corresponding to each sub-pixel to achieve brightness compensation, thereby improving Reduce the complexity of the operation based on the accuracy of pixel brightness compensation And system power consumption.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 2 is a schematic flowchart of a method for compensating a brightness of an AMOLED display device according to Embodiment 2 of the present invention, where the brightness compensation method may include the following steps:
  • Step 201 In the initial compensation phase, the timing controller (TCON) adjusts the initial data voltage outputted by the driving chip to each sub-pixel to obtain the brightness parameter value of the display panel as a set value, and the actual display brightness of each sub-pixel is uniform.
  • the brightness parameter can include grayscale or display brightness. That is, in the initial compensation phase, the timing controller (TCON) can obtain the grayscale of the display panel by setting the initial data voltage outputted by the driving chip to each sub-pixel (for example, 64 gray scale, 128 gray scale, 192 gray). Step or 255 grayscale, etc.) or display brightness as a set value (such as maximum brightness, 1/2 highest brightness, 1/4 highest brightness or 1/8 maximum brightness, etc., wherein the highest brightness of the display panel can be based on the display panel itself Under actual conditions, the data voltage compensation value corresponding to each sub-pixel when the actual display brightness of each sub-pixel is uniform.
  • TCON the timing controller
  • Step 202 The timing controller (TCON) controls the driving chip to output the first data voltage to the pixel circuit corresponding to each sub-pixel according to the data voltage compensation value corresponding to each sub-pixel, and acquire the corresponding corresponding to each sub-pixel by the driving chip.
  • the voltage is induced, and each of the induced voltages is used as an initial reference voltage corresponding to each sub-pixel under the condition that the brightness parameter value of the display panel is the set value.
  • the data voltage compensation value corresponding to any one of the sub-pixels may be the first data voltage of any one of the sub-pixels when the actual display brightness of each sub-pixel is uniform; And is a difference or a proportional value of the first data voltage and an initial data voltage output by the driving chip to the any sub-pixel.
  • the induced voltage corresponding to any one of the sub-pixels may be the electric charge of the TFT (driving thin film transistor) in the pixel circuit of the any sub-pixel.
  • the pressure is not described in detail in the embodiment of the present invention.
  • Step 203 In the subsequent compensation phase, the timing controller (TCON) changes the data voltage outputted by the driving chip to each sub-pixel so that the brightness parameter value of the display panel is the set value, and the corresponding sub-pixels The induced voltage is equal to the initial reference voltage corresponding to each sub-pixel under the condition that the brightness parameter value of the display panel is the set value, so as to achieve brightness uniformity compensation of each sub-pixel in the subsequent compensation stage.
  • TCON the timing controller
  • the error of the line capacitance and the error between the chip channels still exist, it does not have any influence on the pixel brightness compensation.
  • the reason is that the initial reference voltage corresponding to each sub-pixel has been verified by CCD measurement, and each sub-pixel can perform brightness compensation with the initial reference voltage as a reference value.
  • the data voltage is changed to obtain the same induced voltage as the initial reference voltage, it is considered to be uniform compensation, thereby solving the pixel caused by the error between the column-line capacitance error and the chip channel.
  • the problem of inaccurate brightness offset compensation is improved, and the uniformity and accuracy of initial compensation and subsequent compensation are improved.
  • the method may further include the following steps:
  • At any time when it is determined that the brightness parameter value of the display panel is different from the set value, for any sub-pixel, at least two sets of standard reference data related to the any one of the times are used for interpolation calculation, and the calculation is performed. And a data voltage outputted to the pixel circuit corresponding to the any sub-pixel, and controlling the driving chip to drive the pixel circuit corresponding to the any sub-pixel according to the calculated data voltage;
  • Each set of standard reference data associated with any one of the moments may include: a corresponding set value, and, at any one of the moments, under the condition that the brightness parameter value of the display panel is the corresponding set value,
  • the induced voltage corresponding to any one of the sub-pixels is equal to the data voltage at the initial reference voltage associated with the corresponding set value and the any of the sub-pixels.
  • the interpolation operation can be performed based on the plurality of sets of related standard reference data, and the data voltage corresponding to each sub-pixel is obtained to achieve brightness compensation, thereby improving Based on the pixel brightness compensation accuracy, the complexity of the operation and the system power consumption are reduced.
  • the number of standard reference data referenced when performing interpolation calculation can be flexibly set according to actual conditions. For example, the higher the brightness uniformity compensation requirement for the display device, the reference The number of sets of standard reference data can be increased; the lower the brightness uniformity compensation requirement for the display device, the less the number of reference reference data groups can be referenced. This embodiment does not limit this.
  • the standard reference data referenced when performing the interpolation operation is usually a brightness parameter attribute with the non-set value (eg, gray) Standard reference data for the same set value of the order or display brightness).
  • the standard reference data referred to when performing the interpolation operation may generally be a standard corresponding to the set 64 gray scale, 128 gray scale, and the like. Refer to the data. This embodiment of the present invention does not describe this.
  • the interpolation operation is performed for any sub-pixel.
  • the standard reference data associated with any of the times may be obtained in real time by the timing controller (TCON).
  • the two actions of display and sensing may be set to be time-sharing.
  • the time of one frame can be divided into two parts, one part is used to sense the data parameter voltage of each sub-pixel under the condition that the brightness parameter value of the display panel is set value, and the other part is used according to the actual brightness parameter value of the display panel ( Non-set value) is displayed accordingly.
  • This embodiment of the present invention does not describe this.
  • the brightness compensation method may include the following. step:
  • Step 1 Set the grayscale value of the display panel to be detected, such as 64 grayscale, 128 grayscale, 192 grayscale, or 255 grayscale (highest grayscale), etc., to control the driving chip to output data voltage to each subpixel, and Use the CCD to take a picture of the display and measure the actual display brightness of each sub-pixel;
  • Step 2 Adjust the data voltage of each sub-pixel one by one, so that the measured brightness of all sub-pixels is within a required uniform range;
  • Step 3 After the brightness uniformity of the display screen reaches the requirement, store the data voltage and the corresponding grayscale value into the memory for any sub-pixel;
  • Step 4 output the stored corresponding data voltage to the sub-pixel for any sub-pixel a pixel circuit, and detecting, by the ADC module of the driving chip, a voltage for charging the line capacitance Cx by the current of the driving TFT, that is, an induced voltage, and storing it as an initial reference voltage;
  • Step 5 Subsequent compensation stage, for any sub-pixel, by changing the data voltage outputted by the driving chip to the any sub-pixel, so that the brightness of the display panel is the gray-scale value, the any sub-pixel
  • the corresponding induced voltage is equal to the initial reference voltage corresponding to any one of the sub-pixels obtained in step 4 to achieve luminance uniformity compensation of each sub-pixel.
  • the timing controller can only perform the brightness compensation according to the method described in the second embodiment of the present invention.
  • the group standard reference data; and for other brightness parameter values, the data voltage corresponding to each sub-pixel can be obtained by performing interpolation operation based on the plurality of sets of standard reference data to achieve brightness compensation, and the brightness compensation method The following steps can be included:
  • Step 1 Set the display brightness of the display panel to be detected. For example, selecting the highest brightness and 1/4 highest brightness; for each set brightness, controlling the driving chip to output a data voltage to each sub-pixel, and taking a picture of the display screen using the CCD, measuring the actual display brightness of each sub-pixel;
  • Step 2 For each set brightness, adjust the data voltage of each sub-pixel one by one, so that the measured brightness of each sub-pixel reaches the highest brightness and 1/4 highest brightness set in the error tolerance range respectively;
  • Step 3 For each set brightness, when the brightness uniformity of the display screen reaches the requirement, the data voltage and the corresponding set gray scale value are stored into the circuit for any sub-pixel;
  • Step 4 For each set brightness, output the stored corresponding data voltage to the pixel circuit of the sub-pixel for any sub-pixel, and charge the line capacitance Cx by detecting the current of the driving TFT by the ADC module of the driving chip. Voltage, that is, induced voltage, and stored as an initial reference voltage;
  • Step 5 In the subsequent compensation stage, when the brightness parameter of the set display panel is any of the set brightness values, for any sub-pixel, by changing the data voltage output by the driving chip to the any sub-pixel, When the brightness of the display panel is the set display brightness, the induced voltage corresponding to any one of the sub-pixels is equal to the initial reference voltage corresponding to any one of the sub-pixels obtained in step 4, so that the brightness of each sub-pixel is uniform.
  • Sexual compensation or,
  • the calculation needs to be
  • the data voltage output by the pixel circuit of any sub-pixel is output by the driving chip, and corresponding steps are performed to achieve luminance uniformity compensation of each sub-pixel.
  • Step 1 Before the factory, set the display brightness (such as the highest brightness and 1/4 maximum brightness), use the CCD to perform optical compensation, and set the brightness of the display panel to the uniformity requirement under the condition that the display panel is set to display brightness.
  • the data voltage of the sub-pixel and the corresponding set display brightness are stored in, for example, a flash memory;
  • Step 2 Run the initial program to get the initial reference voltage.
  • it can include:
  • the Vgs1/2 calculation unit calculates the driving voltage Vgs1 corresponding to each sub-pixel and the Vgs2 corresponding to each sub-pixel at the highest luminance when the highest luminance is obtained by using the data voltage obtained in step 1, and stores it in a memory (for example, DDR). in;
  • Vgs1 and Vgs2 are used to obtain the induced voltage Vsense1 (ie, the detected value of the ADC module) and Vsense2 of each column of the display panel, and stored in the flash memory as the initial reference voltage for electrical compensation;
  • I1 1/2* ⁇ *(Vgs1-Vth) ⁇ 2;
  • I2 1/2 * ⁇ * (Vgs2-Vth) ⁇ 2.
  • Step 3 Run a regular program to perform pixel compensation.
  • the method may include:
  • the Vsense of each sub-pixel is obtained by using Vgs1 and Vgs2, respectively, and compared with the corresponding initial reference voltages Vsense1 and Vsense2, and Vgs1 and Vgs2 are adjusted according to the comparison result, and the data in the DDR memory is updated, and the DDR memory is The updated Vgs1 and Vgs2 are input to the ⁇ /Vth calculation unit, and the updated ⁇ and vth are obtained and stored in the DDR memory and the flash memory;
  • the display brightness of the screen is non-set display brightness, assuming 1/2 highest brightness, for any sub-pixel, at any time, only according to the current time Vgs1, Vgs2 (according to Vgs, the corresponding data can be directly obtained.
  • the voltage is calculated by interpolation to obtain the data voltage required by any of the sub-pixels, and the brightness uniformity of the display panel is compensated.
  • the parasitic capacitance (ie, line capacitance) on the column alignment lines (such as the reference line, the data line, etc.) of the display screen is still different during the brightness uniformity compensation process.
  • the conversion error of the ADC module for each channel still exists, that is, the error of the line capacitance and the error between the chip channels still exist.
  • the initial reference voltage corresponding to each sub-pixel has been verified by CCD measurement, the presence of the above error does not have any influence on the pixel luminance compensation.
  • Each sub-pixel can perform luminance compensation with the initial reference voltage as a reference value.
  • the interpolation operation may be performed based on the plurality of sets of related standard reference data, and the data voltage corresponding to each sub-pixel is obtained to achieve brightness compensation, thereby further improving the pixel. Based on the accuracy of brightness compensation, the complexity of the operation and the power consumption of the system are reduced.
  • embodiments of the present invention can be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the present invention is made with reference to a method, apparatus (device) and computer program according to an embodiment of the present invention.
  • the flow chart and/or block diagram of the product is described. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
  • These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种有源矩阵有机发光二极管(AMOLED)显示装置及其亮度补偿方法。在初始补偿阶段，可使用图像传感器对显示屏进行亮度校准，以获取显示面板(11)的亮度参数值为设定值时，各子像素的数据电压补偿值，并根据各子像素的数据电压补偿值向对应的像素电路输出第一数据电压，以及，将此时各子像素的感应电压作为显示面板(11)的亮度参数值为设定值时，各子像素的初始参考电压；在后续补偿阶段，通过调整各子像素的数据电压，使显示面板(11)的亮度参数值为设定值时，各子像素的感应电压等于相应的初始参考电压，以实现后续补偿阶段中各子像素的亮度均匀性补偿。这样不仅提高了初始亮度补偿的均匀性以及准确性，而且准确地补偿了像素老化、提高了后续补偿的均匀性以及准确性。

Description

有源矩阵有机发光二极管显示装置及其亮度补偿方法 技术领域
本发明的实施例涉及一种有源矩阵有机发光二极管(AMOLED,active-matrix organic light emitting diode)显示装置及其亮度补偿方法。
背景技术
有源矩阵有机发光二极管(AMOLED,active-matrix organic light emitting diode)显示装置是一种基于有机发光二极管(OLED,organic light emitting diode)的自发光元件。OLED的发光原理是有机半导体材料和发光材料在电场驱动下发生载流子注入和复合而发光。由于具有亮度高、画质清晰、厚度超薄以及显示效能好等诸多优势，AMOLED显示装置有望得到更广泛的应用。
AMOLED显示装置由成千上万的像素组成，每个像素都包括OLED和用于驱动所述OLED的像素电路。像素电路由开关薄膜晶体管(TFT,thin-film transistor)、电容器和驱动TFT组成。开关TFT将与数据信号相对应的电压充电至电容器，驱动TFT根据电容器的电压调节供给至OLED的电流大小，OLED的发光量与所述电流成正比，从而调整OLED的亮度。
然而由于工艺不完善等问题，各像素的驱动TFT的阈值电压Vth和迁移率存在特异性差异，从而导致各像素用于驱动OLED的电流大小不同，各像素之间出现亮度偏差。直观的结果是，最初的驱动TFT特性差异导致屏幕上的斑点或图案，而后续驱动过程中驱动TFT由于退化产生的特异性差异则会减少AMOLED显示面板的使用寿命或者产生图像残留。
为解决这个问题，中国专利CN102968954A公开了一种能够快速感应每个像素的电流以便补偿像素之间的亮度偏差的AMOLED显示装置及其像素电流的感应方法。上述专利利用了显示屏上列向线(如作为电流感应线的基准线、数据线或第一电源线等)上的寄生电容(即线电容)，使驱动TFT的电流对上述寄生电容充电，将充电后的电压输入模拟数字转换器(ADC,analog-to-digital converter)模块，再利用公式I＝Cx(V2-V1)/(t2-t1)计算像素电 流。
然而由于工艺限制，例如成膜厚度不均匀等，显示屏上的每根列向线的电容可能不同；并且，集成电路内ADC模块对于每个通道的转换存在误差，这些均会影响电流的感应，从而使得像素的亮度偏差补偿并不准确。
发明内容
本发明的实施例提供了一种有源矩阵有机发光二极管(AMOLED)显示装置，包括显示面板，所述显示面板包括多个子像素，每个所述子像素包括有机发光二极管(OLED)以及用于独立地驱动所述OLED的像素电路，所述AMOLED显示装置还包括：驱动芯片，构造为向各个所述子像素输出相应的数据电压，以及，获取各个所述子像素所对应的感应电压；时序控制器(TCON)，构造为在初始补偿阶段，通过调整所述驱动芯片向各子像素输出的初始数据电压，获取所述显示面板的亮度参数值为设定值条件下，各子像素的实际显示亮度均匀一致时所对应的数据电压补偿值，并控制驱动芯片根据各子像素所对应的数据电压补偿值向各子像素所对应的像素电路输出第一数据电压，以及，通过驱动芯片获取此时各子像素所对应的感应电压，并将各感应电压作为所述显示面板的亮度参数值为所述设定值条件下，各子像素所对应的初始参考电压；以及，在后续补偿阶段，通过改变驱动芯片向各子像素输出的数据电压，使得所述显示面板的亮度参数值为所述设定值条件下，各子像素所对应的感应电压等于所述显示面板的亮度参数值为所述设定值条件下，各子像素所对应的初始参考电压，以实现后续补偿阶段中各个子像素的亮度均匀性补偿；其中，各子像素的实际显示亮度是由图像传感器测量得到的。
在所述实施例的AMOLED显示装置中，例如，所述亮度参数包括灰阶或者显示亮度。
在所述实施例的AMOLED显示装置中，例如，针对任一子像素，所述任一子像素所对应的数据电压补偿值包括各子像素的实际显示亮度均匀一致时，所述任一子像素的第一数据电压；或者，所述第一数据电压与驱动芯片向所述任一子像素输出的初始数据电压的差值或者比例值。
在所述实施例的AMOLED显示装置中，例如，所述驱动芯片包括数字 模拟转换(DAC)模块和模拟数字转换(ADC)模块；所述DAC模块，构造为向各个子像素输出相应的数据电压；所述ADC模块，构造为检测各个子像素所对应的感应电压。
在所述实施例的AMOLED显示装置中，例如，针对任一子像素，所述任一子像素所对应的感应电压为所述任一子像素的像素电路中的驱动薄膜晶体管TFT对线电容充电的电压。
在所述实施例的AMOLED显示装置中，例如，所述TCON还构造为在任一时刻，当所述显示面板的亮度参数值不等于设定值时，针对任一子像素，利用与所述任一时刻相关的至少两组标准参照数据作插值运算，计算出所述任一时刻需要向所述任一子像素所对应的像素电路输出的数据电压，并控制驱动芯片根据计算出的数据电压驱动所述任一子像素所对应的像素电路；其中，与所述任一时刻相关的每一组标准参照数据包括：相应的设定值，以及，在所述任一时刻、当显示面板的亮度参数值为所述相应的设定值时，使得所述任一子像素所对应的感应电压等于与所述相应的设定值以及所述任一子像素相关的初始参考电压时的数据电压。
本发明的实施例还提供了一种有源矩阵有机发光二极管(AMOLED)显示装置的亮度补偿方法，包括：在初始补偿阶段，时序控制器(TCON)通过调整驱动芯片向各个子像素输出的初始数据电压，获取显示面板的亮度参数的取值为设定值条件下、各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值，并控制驱动芯片根据各子像素所对应的数据电压补偿值向各子像素所对应的像素电路输出第一数据电压，以及，通过驱动芯片获取此时各子像素所对应的感应电压，并将各感应电压作为所述显示面板的亮度参数的取值为所述设定值条件下、各子像素所对应的初始参考电压；在后续补偿阶段，时序控制器TCON通过改变驱动芯片向各子像素输出的数据电压，以使得显示面板的亮度参数值为所述设定值时，各子像素所对应的感应电压等于所述显示面板的亮度参数值为所述设定值时，各子像素所对应的初始参考电压，以实现后续补偿阶段中各个子像素的亮度均匀性补偿；其中，各子像素的实际显示亮度是由图像传感器测量得到的。
在所述实施例的亮度补偿方法中，例如，所述亮度参数包括灰阶或者显示亮度。
在所述实施例的亮度补偿方法中，例如，针对任一子像素，所述任一子像素所对应的数据电压补偿值包括各子像素的实际显示亮度均匀一致时，所述任一子像素的第一数据电压；或者，所述第一数据电压与驱动芯片向所述任一子像素输出的初始数据电压的差值或者比例值。
在所述实施例的亮度补偿方法中，例如，针对任一子像素，所述任一子像素所对应的感应电压为所述任一子像素的像素电路中的驱动薄膜晶体管TFT对线电容充电的电压。
在所述实施例的亮度补偿方法中，例如，所述方法还包括：在任一时刻，在显示面板的亮度参数值为不等于设定值时，针对任一子像素，利用与所述任一时刻相关的至少两组标准参照数据作插值运算，计算出所述任一时刻需要向所述任一子像素所对应的像素电路输出的数据电压，并控制驱动芯片根据计算出的数据电压驱动所述任一子像素所对应的像素电路；其中，与所述任一时刻相关的每一组标准参照数据包括：相应的设定值，以及，在所述任一时刻、当显示面板的亮度参数的取值为所述相应的设定值时，使得所述任一子像素所对应的感应电压等于与所述相应的设定值以及所述任一子像素相关的初始参考电压时的数据电压。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例，而非对本发明的限制。
图1所示为本发明实施例中所述AMOLED显示装置的结构示意图；
图2所示为本发明实施例中所述AMOLED显示装置的亮度补偿方法的流程示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例，都属于本发明保护的范围。
实施例一：
本发明实施例一提供了一种AMOLED显示装置。图1为本发明实施例一中所述AMOLED显示装置的结构示意图，所述AMOLED显示装置包括显示面板11、时序控制器(TCON)12和驱动芯片13，其中：
显示面板11包括多个子像素(例如每个子像素由图中横向的栅线和纵向的数据线彼此交叉所限定)，每个子像素包括OLED以及用于独立地驱动所述OLED的像素电路；该像素电路例如可以包括驱动晶体管、开关晶体管、电容等器件。OLED器件可以发白光或红绿蓝等单色光。
驱动芯片13可用于向各个子像素输出相应的数据电压，以及获取各个子像素所对应的感应电压；
在初始补偿阶段，通过TCON 12调整驱动芯片13向各个子像素输出的初始数据电压，获取所述显示面板的亮度参数的值为设定值条件下、各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值，并控制驱动芯片13根据各子像素所对应的数据电压补偿值，向各子像素所对应的像素电路输出第一数据电压，以及，通过驱动芯片13获取此时各子像素所对应的感应电压，并将各感应电压作为所述显示面板的亮度参数的取值为所述设定值条件下，各子像素所对应的初始参考电压；以及，在后续补偿阶段，通过改变驱动芯片13向各个子像素输出的数据电压，使得所述显示面板的亮度参数的取值为所述设定值时，各子像素所对应的感应电压等于在所述显示面板的亮度参数的取值为所述设定值时各子像素所对应的初始参考电压，以实现后续补偿阶段中各个子像素的亮度均匀性补偿；其中，各子像素的实际显示亮度例如可以由图像传感器，例如电荷耦合器件(CCD)，测量得到的(即，使用CCD对显示屏进行拍照，以测量各子像素的实际显示亮度)。也可以使用互补金属氧化物半导体(CMOS)成像器件等方式测量各子像素的实际显示亮度。TCON 12以及驱动芯片13等可以通过相应的电路或子电路实现。
也就是说，在本实施例中，由于各子像素所对应的初始参考电压已经经过CCD测量验证过(即已经过光学补偿)，虽然线电容的误差以及芯片通道之间的误差仍然存在，但是不会对像素亮度补偿造成任何影响。因而，每个子像素可以以该初始参考电压作为参考值进行亮度补偿。在后续的使用中， 通过改变数据电压，获得与该初始参考电压相同的感应电压时认为达到了均匀补偿，从而可以解决列向线电容误差和芯片通道之间的误差所带来的像素亮度偏差补偿不准确的问题，提高初始补偿和后续补偿的均匀性和准确性。
例如，所述亮度参数可以包括灰阶或者显示亮度。在初始补偿阶段，可通过TCON 12调整驱动芯片13向各个子像素输出的初始数据电压，获取显示面板的灰阶为设定值(如64灰阶、128灰阶、192灰阶或255灰阶等)，或者显示亮度为设定值(如最高亮度、1/2最高亮度、1/4最高亮度或1/8最高亮度等，其中显示面板的最高亮度可基于显示面板自身的实际情况而定)时，各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值。
需要说明的是，当各子像素中的任意两个子像素的实际显示亮度的亮度差值均位于设定的误差允许范围内时(例如偏差小于5％时)，可认为各子像素的实际显示亮度均匀一致，本发明实施例对此不作赘述。
例如，针对任一子像素，所述任一子像素所对应的数据电压补偿值可以是各子像素的实际显示亮度均匀一致时，所述任一子像素的第一数据电压；也可以是所述第一数据电压与驱动芯片13向所述任一子像素输出的初始数据电压的差值或者比例值。
也就是说，当显示面板的亮度参数的值为设定值时，针对任一子像素，既可以将各子像素的实际显示亮度均匀一致时，该子像素的实际数据电压作为该子像素所对应的数据电压补偿值；也可以将该子像素在各子像素的实际显示亮度均匀一致时的实际数据电压、与该子像素的初始数据电压的差值或者比例值等作为该子像素所对应的数据电压补偿值，以提高数据电压补偿值的多样性以及灵活性。
需要说明的是，在显示面板的亮度参数的值为设定值的条件下，得到各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值之后，所述TCON 12例如还可将显示面板的设定亮度参数取值和各子像素的数据电压补偿值进行存储，以便后续通过驱动芯片13向各子像素所对应的像素电路输出第一数据电压时使用。这些数据例如存储在独立于TCON 12的存储器中或存储在整合在TCON 12的存储器中，这些存储器可以为多种类型，例如易失性或非易失性存储器。
另外需要说明的是，在显示面板的亮度参数值为所述设定值的条件下， 得到各子像素所对应的初始参考电压之后，所述TCON 12例如还可以存储显示面板的设定亮度参数取值和各子像素所对应的初始参考电压，以便后续补偿阶段时使用，本发明实施例对此不作赘述。
需要说明的是，在本发明所述实施例中，所述设定值可为任一值，即，针对任一设定的亮度参数取值(如任一设定的灰阶或任一设定的显示亮度)，TCON 12均可按照下述方式进行像素亮度补偿：在初始补偿阶段，通过调整驱动芯片13向各个子像素输出的初始数据电压，在显示面板的亮度参数值为该设定值的条件下，获取各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值，并控制驱动芯片13根据各子像素所对应的数据电压补偿值，向各子像素所对应的像素电路输出第一数据电压，以及，通过驱动芯片13获取此时各子像素所对应的感应电压，并将各感应电压作为显示面板的亮度参数值为该设定值的条件下，各子像素所对应的初始参考电压；以及，在后续补偿阶段，通过改变驱动芯片13向各个子像素输出的数据电压，使得显示面板的亮度参数的取值为该设定值时，各子像素所对应的感应电压等于在所述显示面板的亮度参数的取值为所述设定值时各子像素所对应的初始参考电压，以实现后续补偿阶段中各个子像素的亮度均匀性补偿。
但是，若对每一设定的亮度参数取值均按照上述方式进行像素亮度的补偿，会多次计算相应的初始参考电压，从而相应地操作可能过于复杂、系统功耗可能增大。因此，在本发明另一实施例中，为了降低操作的复杂性以及降低功耗，所述TCON 12可仅针对设定的几个亮度参数取值(如2个或3个等)，按照上述方式进行亮度补偿，得到多组标准参照数据，而对于其他的亮度参数值，则可通过基于上述多组标准参照数据进行插值运算的方式来得到各子像素所对应的数据电压以实现亮度补偿。
也就是说，所述TCON 12还可用于在任一时刻，当确定所述显示面板的亮度参数值不等于设定值时(即为非设定值)，针对任一子像素，利用与该时刻相关的至少两组标准参照数据作插值运算，计算出该时刻(所述显示面板的亮度参数的取值为非设定值时)需要向所述任一子像素所对应的像素电路输出的数据电压，并控制驱动芯片13根据计算出的数据电压驱动所述任一子像素所对应的像素电路；
与所述任一时刻相关的每一组标准参照数据可以包括：相应的设定值， 以及在所述任一时刻、当显示面板的亮度参数值为所述相应的设定值时，使得所述任一子像素所对应的感应电压等于与所述相应的设定值以及所述任一子像素相关的初始参考电压时的数据电压。
需要说明的是，进行插值运算时所参考的标准参照数据的组数可根据实际情况灵活设定。例如，当对显示装置的亮度均匀性补偿要求越高时，所参考的标准参照数据的组数可越多；当对显示装置的亮度均匀性补偿要求越低时，所参考的标准参照数据的组数可越少，本实施例对此不作限定。
另外需要说明的是，当所述显示面板的亮度参数值为非设定值时，进行插值运算时所参考的标准参照数据通常是与所述非设定值的亮度参数属性(如为灰阶还是显示亮度)相同的设定值的标准参照数据。如，当确定所述非设定值为255灰阶(例如最高灰阶)时，进行插值运算时所参考的标准参照数据通常可为设定的64灰阶、128灰阶等所对应的标准参照数据，本发明实施例对此不作赘述。
进一步地，需要说明的是，在任一时刻，当确定所述显示面板的亮度参数值不等于设定值时(即为非设定值)，针对任一子像素，进行插值运算时所基于的与所述任一时刻相关的标准参照数据可以是所述TCON 12实时获取到的。
可选地，为了实现标准参照数据的实时获取，可将显示与感应两个动作设置为分时进行。例如可将一帧的时间分为两部分，一部分用于感应显示面板的亮度参数值为设定值时，各子像素的数据电压；另一部分则用于依据显示面板的实际亮度参数值(即非设定值)进行相应显示。本发明实施例对此不作赘述。
进一步地，本发明实施例中所述的驱动芯片13例如可包括DAC(数字模拟转换)模块和ADC(模拟数字转换)模块。
所述DAC模块可用于向各个子像素输出相应的数据电压；例如，在初始补偿阶段，所述DAC模块可根据所述TCON 12的控制，向各子像素所对应的像素电路输出相应的第一数据电压；
所述ADC模块可用于检测各个子像素所对应的感应电压；例如，在初始补偿阶段，所述ADC模块可根据所述TCON 12的控制，检测驱动芯片根据各子像素所对应的数据电压补偿值向各子像素所对应的像素电路输出第一 数据电压时，各子像素所对应的感应电压。
针对任一子像素，所述任一子像素所对应的感应电压通常可以为所述任一子像素的像素电路中的TFT(驱动薄膜晶体管)对线电容充电的电压，本发明实施例对此不作赘述。
本发明实施例一提供了一种AMOLED显示装置，在本发明实施例一所述技术方案中，所述AMOLED显示装置可包括时序控制器(TCON)和驱动芯片。所述时序控制器(TCON)可用于在初始补偿阶段，通过调整驱动芯片向各个子像素输出的初始数据电压，获取显示面板的亮度参数值为设定值条件下，各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值，并控制驱动芯片根据各子像素所对应的数据电压补偿值向各子像素所对应的像素电路输出第一数据电压，以及，通过驱动芯片获取此时各子像素所对应的感应电压，并将各感应电压作为所述显示面板的亮度参数值为所述设定值条件下，各子像素所对应的初始参考电压；以及，在后续补偿阶段，通过改变驱动芯片向各个子像素输出的数据电压，使得显示面板的亮度参数值为所述设定值时，各子像素所对应的感应电压等于在所述显示面板的亮度参数值为所述设定值时各子像素所对应的初始参考电压，以实现后续补偿阶段中各个子像素的亮度均匀性补偿。其中，各子像素的实际显示亮度是由CCD测量得到的。
也就是说，在亮度均匀性补偿过程中，虽然显示屏各列向线(如基准线、数据线等)上的寄生电容(即线电容)仍然不同，且ADC模块对于每个通道的转换误差仍然存在，即线电容的误差以及芯片通道之间的误差仍然存在，但是由于各子像素所对应的初始参考电压已经经过例如CCD测量验证过，像素亮度补偿不会受到任何影响，每个子像素可以以该初始参考电压作为参考值进行亮度补偿。在后续的使用中，通过改变数据电压，获得与该初始参考电压相同的感应电压时，则认为是补偿均匀的，从而可以解决列向线电容误差和芯片通道之间的误差所带来的像素亮度偏差补偿不准确的问题，提高初始补偿和后续补偿的均匀性以及准确性。
另外，由于针对任一不同于设定值的其它亮度参数值，可基于多组相关的标准参照数据进行插值运算，来得到各子像素所对应的数据电压以实现亮度补偿，从而还可在提高像素亮度补偿准确性的基础上，降低操作的复杂性 以及系统功耗。
实施例二：
基于与本发明实施例一相同的发明构思，本发明实施例二提供了一种AMOLED显示装置的亮度补偿方法。图2为本发明实施例二中所述AMOLED显示装置的亮度补偿方法的流程示意图，所述亮度补偿方法可包括以下步骤：
步骤201：在初始补偿阶段，时序控制器(TCON)通过调整驱动芯片向各个子像素输出的初始数据电压，获取显示面板的亮度参数值为设定值条件下，各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值；其中，各子像素的实际显示亮度是由CCD测量得到的。
例如，所述亮度参数可包括灰阶或者显示亮度。即，在初始补偿阶段，时序控制器(TCON)可通过调整驱动芯片向各个子像素输出的初始数据电压，获取显示面板的灰阶为设定值(如64灰阶、128灰阶、192灰阶或255灰阶等)或者显示亮度为设定值(如最高亮度、1/2最高亮度、1/4最高亮度或1/8最高亮度等，其中显示面板的最高亮度可基于显示面板自身的实际情况而定)条件下，各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值。
需要说明的是，当各子像素中的任意两个子像素的实际显示亮度的亮度差值均位于设定的误差允许范围内时，可认为各子像素的实际显示亮度均匀一致，本发明实施例对此不作赘述。
步骤202：时序控制器(TCON)控制驱动芯片根据各子像素所对应的数据电压补偿值向各子像素所对应的像素电路输出第一数据电压，通过驱动芯片获取此时各子像素所对应的感应电压，并将各感应电压作为所述显示面板的亮度参数值为所述设定值条件下，各子像素所对应的初始参考电压。
可选地，针对任一子像素，所述任一子像素所对应的数据电压补偿值可以是各子像素的实际显示亮度均匀一致时，所述任一子像素的第一数据电压；也可以是所述第一数据电压与驱动芯片向所述任一子像素输出的初始数据电压的差值或者比例值。
另外，针对任一子像素，所述任一子像素所对应的感应电压通常可以为所述任一子像素的像素电路中的TFT(驱动薄膜晶体管)对线电容充电的电 压，本发明实施例对此不作赘述。
步骤203：在后续补偿阶段，时序控制器(TCON)通过改变驱动芯片向各个子像素输出的数据电压，以使得显示面板的亮度参数值为所述设定值条件下，各子像素所对应的感应电压等于所述显示面板的亮度参数值为所述设定值条件下，各子像素所对应的初始参考电压，以实现后续补偿阶段中各个子像素的亮度均匀性补偿。
也就是说，虽然线电容的误差以及芯片通道之间的误差仍然存在，但是不会对像素亮度补偿造成任何影响。原因在于，各子像素所对应的初始参考电压已经经过CCD测量验证过，每个子像素可以以该初始参考电压作为参考值进行亮度补偿。在后续的使用中，通过改变数据电压，获得与该初始参考电压相同的感应电压时，则认为是补偿均匀的，从而可以解决列向线电容误差和芯片通道之间的误差所带来的像素亮度偏差补偿不准确的问题，提高初始补偿和后续补偿的均匀性以及准确性。
可选地，为了降低系统功耗，提高操作的简便性，所述方法还可包括以下步骤：
在任一时刻，当确定显示面板的亮度参数值为不同于设定值的其他值时，针对任一子像素，利用与所述任一时刻相关的至少两组标准参照数据作插值运算，计算出需要向所述任一子像素所对应的像素电路输出的数据电压，并控制驱动芯片根据计算出的数据电压驱动所述任一子像素所对应的像素电路；
与所述任一时刻相关的每一组标准参照数据可包括：相应的设定值，以及，在所述任一时刻、在显示面板的亮度参数值为所述相应的设定值条件下，使得所述任一子像素所对应的感应电压等于与所述相应的设定值以及所述任一子像素相关的初始参考电压时的数据电压。
也就是说，针对任一不同于设定值的其它亮度参数值，可基于多组相关的标准参照数据进行插值运算，得到各子像素所对应的数据电压以实现亮度补偿，从而还可在提高像素亮度补偿准确性的基础上，降低操作的复杂性以及系统功耗。
需要说明的是，进行插值运算时所参考的标准参照数据的组数可根据实际情况灵活设定。例如，对显示装置的亮度均匀性补偿要求越高，所参考的 标准参照数据的组数可越多；对显示装置的亮度均匀性补偿要求越低，所参考的标准参照数据的组数可越少。本实施例对此不作限定。
另外需要说明的是，当确定所述显示面板的亮度参数值为非设定值时，进行插值运算时所参考的标准参照数据通常是与所述非设定值的亮度参数属性(如为灰阶或显示亮度)相同的设定值的标准参照数据。如，当确定所述非设定值为255灰阶(例如最高灰阶)时，进行插值运算时所参考的标准参照数据通常可为设定的64灰阶、128灰阶等所对应的标准参照数据。本发明实施例对此不作赘述。
进一步需要说明的是，在任一时刻，当确定所述显示面板的亮度参数的取值不等于设定值(即为非设定值)时，针对任一子像素，进行插值运算时所基于的与所述任一时刻相关的标准参照数据可以是所述时序控制器(TCON)实时获取到的。
可选地，为了实现标准参照数据的实时获取，可将显示与感应两个动作设置为分时进行。例如可将一帧的时间分为两部分，一部分用于感应显示面板的亮度参数值为设定值条件下，各子像素的数据电压；另一部分则用于依据显示面板的实际亮度参数值(非设定值)进行相应显示。本发明实施例对此不作赘述。
下面将举例对本发明实施例二中所述的亮度补偿方法进行进一步说明。
例(1)：
假设显示面板的亮度参数为灰阶，且针对任一设定的灰阶，时序控制器(TCON)均可按照本发明实施例二所述方式进行亮度补偿，则所述亮度补偿方法可包括以下步骤：
步骤1：设置要检测的显示面板的灰阶值，例如64灰阶，128灰阶，192灰阶，或255灰阶(最高灰阶)等，控制驱动芯片向每个子像素输出数据电压，并使用CCD对显示屏拍照，测量每个子像素的实际显示亮度；
步骤2：逐一调整每个子像素的数据电压，使测量到的所有子像素的亮度都在要求的均匀范围内；
步骤3：当显示屏的亮度均匀性达到要求后，针对任一子像素，将其数据电压与相应的灰阶值存储到存储器中；
步骤4：针对任一子像素，将存储的对应的数据电压输出给所述子像素 的像素电路，并通过驱动芯片的ADC模块检测驱动TFT的电流对线电容Cx充电的电压，即感应电压，并将其作为初始参考电压存储；
步骤5：后续补偿阶段，针对任一子像素，通过改变驱动芯片向所述任一子像素输出的数据电压，以使得显示面板的亮度为该灰阶值条件下，所述任一子像素所对应的感应电压等于步骤4所得到的所述任一子像素所对应的初始参考电压，来实现各子像素的亮度均匀性补偿。
例(2)：
假设显示面板的亮度参数为显示亮度，且时序控制器(TCON)可仅针对设定的几个亮度参数取值(如2个)，按照本发明实施例二所述方式进行亮度补偿，得到多组标准参照数据；而对于其他的亮度参数取值，则可通过基于上述多组标准参照数据进行插值运算的方式来得到各子像素所对应的数据电压以实现亮度补偿，则所述亮度补偿方法可包括以下步骤：
步骤1：设置要检测的显示面板的设定显示亮度。例如，选择最高亮度和1/4最高亮度；针对每一设定亮度，控制驱动芯片向每个子像素输出数据电压，并使用CCD对显示屏拍照，测量每个子像素的实际显示亮度；
步骤2：针对每一设定亮度，逐一调整每个子像素的数据电压，使测量到的各子像素的亮度在误差允许范围内分别达到上述设定的最高亮度、1/4最高亮度；
步骤3：针对每一设定亮度，当显示屏的亮度均匀性达到要求后，针对任一子像素，将其数据电压与相应的设定灰阶值存储到电路中；
步骤4：针对每一设定亮度，针对任一子像素，将存储的对应的数据电压输出给所述子像素的像素电路，并通过驱动芯片的ADC模块检测驱动TFT的电流对线电容Cx充电的电压，即感应电压，并将其作为初始参考电压存储；
步骤5：后续补偿阶段，当设置的显示面板的亮度参数为任一所述设定亮度值时，针对任一子像素，通过改变驱动芯片向所述任一子像素输出的数据电压，以使得显示面板的亮度为该设定显示亮度时，所述任一子像素所对应的感应电压等于步骤4所得到的所述任一子像素所对应的初始参考电压，来实现各子像素的亮度均匀性补偿；或者，
在任一时刻，当设置的显示面板的亮度参数为任一非设定亮度值，例如 1/2最高亮度时，针对任一子像素，利用与所述任一时刻相关的最高亮度、以及1/4最高亮度所对应的亮度补偿均匀时的数据电压作插值运算，计算需要向所述任一子像素的像素电路输出的数据电压，并由驱动芯片输出，并进行相应的步骤，以实现各子像素的亮度均匀性补偿。
进一步地，上述实例二所述方法的一个示例还可以如下所述：
步骤1：出厂前针对设定显示亮度(例如最高亮度和1/4最高亮度)，利用CCD进行光学补偿，在显示面板为设定显示亮度条件下，将显示面板的亮度达到均匀性要求的各子像素的数据电压以及相应的设定显示亮度存入例如闪存(Flash)；
步骤2：运行初始程序，获得初始参考电压。例如可包括：
2.1、从闪存中读取数据；
2.2、Vgs1/2计算单元利用步骤1得到的数据电压计算出最高亮度时每个子像素对应的驱动电压Vgs1、和1/4最高亮度时每个子像素对应的Vgs2，并存入存储器(例如DDR)中；
2.3、感应阶段，分别使用Vgs1、Vgs2获得显示面板每列的感应电压Vsense1(即ADC模块的检测值)、Vsense2，存入闪存，作为电学补偿的初始参考电压；
2.4、将Vgs1、Vgs2输入μ/Vth计算单元，计算迁移率μ和阈值电压Vth，并将所得结果存入DDR存储器及闪存中；其中，μ、Vth的求解依据公式：
I＝1/2*μ*(Vgs-Vth)^2；
上式中，μ和Vth为未知数，将Vgs1和Vgs2带入上式建立方程组，即可求得μ和Vth：
I1＝1/2*μ*(Vgs1-Vth)^2；
I2＝1/2*μ*(Vgs2-Vth)^2。
步骤3：运行常规程序，进行像素补偿，具体可包括：
3.1、开机从闪存中读取μ、Vth；需要说明的是，补偿可以是在显示阶段实时进行的；
3.2、根据上步所得μ、Vth计算最高亮度时每个子像素对应的Vgs1、和1/4最高亮度时每个子像素对应的Vgs2，存入DDR存储器；并获取每列的Vsense1和Vsense2作为初始参考电压；
3.3、感应阶段：
在任一时刻，分别使用Vgs1、Vgs2获取每个子像素的Vsense，并与对应的初始参考电压Vsense1、Vsense2进行比较，根据比较结果对Vgs1、Vgs2进行调整，更新DDR存储器内数据，并将DDR存储器中的更新过的Vgs1、Vgs2输入到μ/Vth计算单元，得到更新后的μ、vth，存入DDR存储器及闪存；
若屏幕的显示亮度为非设定显示亮度，假设为1/2最高亮度，则针对任一子像素，在任一时刻，只需根据当前时刻的Vgs1、Vgs2(根据Vgs可直接求得相应的数据电压)作插值计算，即可得到所述任一子像素所需的数据电压，实现显示面板亮度均匀性补偿。
也就是说，在本发明实施例二所述技术方案中，在亮度均匀性补偿过程中，显示屏各列向线(如基准线、数据线等)上的寄生电容(即线电容)仍然不同，且ADC模块对于每个通道的转换误差仍然存在，即，线电容的误差以及芯片通道之间的误差仍然存在。但是由于各子像素所对应的初始参考电压已经经过CCD测量验证过，上述误差的存在不会对像素亮度补偿造成任何影响。每个子像素可以以该初始参考电压作为参考值进行亮度补偿。在后续的使用中，通过改变数据电压，获得与该初始参考电压相同的感应电压时，则认为是补偿均匀的。从而可以解决列向线电容误差和芯片通道之间的误差所带来的像素亮度偏差补偿不准确的问题，提高初始补偿和后续补偿的均匀性以及准确性。
另外，由于针对任一不同于设定值的其它亮度参数值，可基于多组相关的标准参照数据进行插值运算，获得各子像素所对应的数据电压以实现亮度补偿，从而还可在提高像素亮度补偿准确性的基础上，降低操作的复杂性以及系统功耗。
本领域技术人员应明白，本发明的实施例可提供为方法、装置(设备)、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、装置(设备)和计算机程序产 品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述仅是本发明的示范性实施方式，而非用于限制本发明的保护范围，本发明的保护范围由所附的权利要求确定。
本申请要求于2015年8月26日递交的中国专利申请第201510531737.0号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (11)

  1. 一种有源矩阵有机发光二极管(AMOLED)显示装置，包括显示面板，所述显示面板包括多个子像素，每个所述子像素包括有机发光二极管(OLED)以及用于独立地驱动所述OLED的像素电路，所述AMOLED显示装置还包括：
    驱动芯片，构造为向各个所述子像素输出相应的数据电压，以及获取各个所述子像素所对应的感应电压；
    时序控制器(TCON)，构造为在初始补偿阶段，通过调整所述驱动芯片向各子像素输出的初始数据电压，获取所述显示面板的亮度参数值为设定值条件下，各子像素的实际显示亮度均匀一致时所对应的数据电压补偿值，并控制所述驱动芯片根据各子像素所对应的数据电压补偿值向各子像素所对应的像素电路输出第一数据电压，以及，通过所述驱动芯片获取此时各子像素所对应的感应电压，并将各感应电压作为所述显示面板的亮度参数值为所述设定值条件下，各子像素所对应的初始参考电压；以及，在后续补偿阶段，通过改变驱动芯片向各子像素输出的数据电压，使得所述显示面板的亮度参数值为所述设定值条件下，各子像素所对应的感应电压等于在所述显示面板的亮度参数值为所述设定值条件下各子像素所对应的初始参考电压，以实现后续补偿阶段中各个子像素的亮度均匀性补偿；
    其中，各子像素的实际显示亮度是由图像传感器测量得到的。
  2. 如权利要求1所述的AMOLED显示装置，其中，
    所述亮度参数包括灰阶或者显示亮度。
  3. 如权利要求1所述的AMOLED显示装置，其中，
    针对任一子像素，所述任一子像素所对应的数据电压补偿值包括各子像素的实际显示亮度均匀一致时，所述任一子像素的第一数据电压；或者，所述第一数据电压与驱动芯片向所述任一子像素输出的初始数据电压的差值或者比例值。
  4. 如权利要求1所述的AMOLED显示装置，其中，所述驱动芯片包括数字模拟转换(DAC)模块和模拟数字转换(ADC)模块；
    所述DAC模块，构造为向各个子像素输出相应的数据电压；
    所述ADC模块，构造为检测各个子像素所对应的感应电压。
  5. 如权利要求1所述的AMOLED显示装置，其中，
    针对任一子像素，所述任一子像素所对应的感应电压为所述任一子像素的像素电路中的驱动薄膜晶体管(TFT)对线电容充电的电压。
  6. 如权利要求1所述的AMOLED显示装置，其中，
    所述TCON，还构造为在任一时刻，当所述显示面板的亮度参数值不等于设定值时，针对任一子像素，利用与所述任一时刻相关的至少两组标准参照数据作插值运算，计算出所述任一时刻需要向所述任一子像素所对应的像素电路输出的数据电压，并控制驱动芯片根据计算出的数据电压驱动所述任一子像素所对应的像素电路；
    其中，与所述任一时刻相关的每一组标准参照数据包括：相应的设定值，以及，在所述任一时刻、当显示面板的亮度参数值为所述相应的设定值时，使得所述任一子像素所对应的感应电压等于与所述相应的设定值以及所述任一子像素相关的初始参考电压时的数据电压。
  7. 一种有源矩阵有机发光二极管(AMOLED)显示装置的亮度补偿方法，包括：
    在初始补偿阶段，时序控制器(TCON)通过调整驱动芯片向各个子像素输出的初始数据电压，获取显示面板的亮度参数的取值为设定值条件下、各子像素的实际显示亮度均匀一致时各子像素所对应的数据电压补偿值，并控制所述驱动芯片根据各子像素所对应的数据电压补偿值向各子像素所对应的像素电路输出第一数据电压，以及，通过所述驱动芯片获取此时各子像素所对应的感应电压，并将各感应电压作为所述显示面板的亮度参数的取值为所述设定值条件下、各子像素所对应的初始参考电压；
    在后续补偿阶段，所述TCON通过改变所述驱动芯片向各子像素输出的数据电压，以使得所述显示面板的亮度参数值为所述设定值时，各子像素所对应的感应电压等于所述显示面板的亮度参数值为所述设定值时，各子像素所对应的初始参考电压，以实现后续补偿阶段中各个子像素的亮度均匀性补偿；
    其中，各子像素的实际显示亮度是由图像传感器测量得到的。
  8. 如权利要求7所述的方法，其中，
    所述亮度参数包括灰阶或者显示亮度。
  9. 如权利要求7所述的方法，其中，
    针对任一子像素，所述任一子像素所对应的数据电压补偿值包括各子像素的实际显示亮度均匀一致时，所述任一子像素的第一数据电压；或者，所述第一数据电压与所述驱动芯片向所述任一子像素输出的初始数据电压的差值或者比例值。
  10. 如权利要求7所述的方法，其中，
    针对任一子像素，所述任一子像素所对应的感应电压为所述任一子像素的像素电路中的驱动薄膜晶体管(TFT)对线电容充电的电压。
  11. 如权利要求7所述的方法，所述方法还包括：
    在任一时刻，在显示面板的亮度参数值为不等于设定值时，针对任一子像素，利用与所述任一时刻相关的至少两组标准参照数据作插值运算，计算出所述任一时刻需要向所述任一子像素所对应的像素电路输出的数据电压，并控制驱动芯片根据计算出的数据电压驱动所述任一子像素所对应的像素电路；
    其中，与所述任一时刻相关的每一组标准参照数据包括：相应的设定值，以及，在所述任一时刻、当显示面板的亮度参数的取值为所述相应的设定值时，使得所述任一子像素所对应的感应电压等于与所述相应的设定值以及所述任一子像素相关的初始参考电压时的数据电压。
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