Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.

Shenzhen China Star Optoelectronics Technology Co., Ltd.

Jimu Kuang

Yichien Wen

Hongjun Xie

Houliang Hu

Chihhao Wu

The present invention provides an OLED pixel driving circuit and a pixel driving method. The OLED pixel driving circuit utilizes the 7T2C structure, and comprises a first N type thin film transistor (T), a second N type thin film transistor (T), a third N type thin film transistor (T), a fourth N type thin film transistor (T), a fifth P type thin film transistor (T), a sixth N type thin film transistor (T), a seventh P type thin film transistor (T), a first capacitor (C), a second capacitor (C) and an organic light emitting diode (D), and the first scan signal (Scan), the second scan signal (Scan), the third scan signal (Scan), the light emitting control signal (EM) and the data signal (Data) are combined with one another to correspond to a reset stage, a threshold voltage detection stage, a program stage and a light emitting stage one after another.

OLED pixel driving circuit and pixel driving method

The invention provides an OLED pixel driving circuit and OLED display device. The OLED pixel driving circuit uses 5T1C structure and switch (K). By switch signal (Switch) controlling the switch (K) to connect first pin (K) and second pin (K) to enter display mode, and to connect first pin (K) and third pin (K) to enter sense mode, the ADC (ADC) senses the threshold voltage of the fourth TFT (T), converted and used for data compensation in the display mode, able to compensate and eliminate the impact of threshold voltage of the fourth TFT (T) on the current flowing through the OLED (D); the light-emitting control signal (EM) controls the fifth TFT (T) connected to the OLED (D) to cut off during the data writing stage (t) to keep the data signal voltage and the gate voltage of the fourth TFT (T) unaffected by the OLED (D) threshold voltage.

OLED pixel driving circuit and OLED display device

The invention provides an OLED pixel driving circuit and OLED display device. The OLED pixel driving circuit uses 4T1C structure and switch (K). The first pin (K) of switch (K) is connected to the drain of the third TFT (T), the second pin (K) connected to the DAC (DAC), and the third pin (K) connected to the ADC (ADC). By the switch signal (Switch) controlling the switch (K), the first pin (K) and the second pin (K) are connected to enter the display mode, and by the switch signal (Switch) controlling the switch (K), the first pin (K) and the third pin (K) are connected to enter the sense mode, so that the ADC (ADC) senses the threshold voltage of the fourth TFT (T), converted by ADC (ADC) for data compensation in the display mode. The invention can compensate, improve display uniform, improve pixel aperture ratio and reduce manufacturing cost.

The invention provides an OLED pixel driving circuit and pixel driving method. The OLED pixel driving circuit adopts a 6T2C structure, comprising: first to sixth TFTs (T, T, T, T, T, T), a first capacitor (C), a second capacitor (c), and an OLED (D); the (n&#x2212;1)th first scan signal (Scan(&#x2212;1)), n-th first scan signal (Scan()), n-th second scan signal (Scan()), n-th third scan signal (Scan()), n-th fourth scan signal (Scan()) and the data signal (Data) are combined w to correspond to a reset stage, a threshold voltage storage stage, a data writing stage, a capacitor cascading stage, and a display lighting stage respectively so that the current flowing through the OLED is independent of the threshold voltage of driving TFT.

The OLED pixel driving circuit adds the third thin film transistor (T) and arranges the switch (K) on the basis of the 2T1C structure. The first pin (K) of the switch (K) is electrically coupled to the drain of the third thin film transistor (T), and the second pin (K) is electrically coupled to the digital to analog converter (DAC), and the third pin is electrically coupled to the analog to digital converter (ADC). The switch signal (Switch) is used to control the switch (K) to connect the first pin (K) and the second pin (K) for entering the display mode, and the switch signal (Switch) is used to control the switch (K) to connect the first pin (K) and the third pin (K) for entering the sensing mode so that the analog to digital converter (ADC) can sense the threshold voltage (Vth) of the second thin film transistor (T).

The invention provides a Mura compensation method for display panel, which extracts the luminance information of a grayscale b other than the lowest grayscale from the inputted image through an image console, generates a Mura value index table for 0 to the lowest grayscale; uses linearly interpolation calculate the Mura values for the remaining grayscales; determines the inputted data signal; for low grayscale image smaller than the lowest grayscale, searches the index table for Mura value to perform Mura compensation to make the compensated grayscale larger than the lowest grayscale; for dynamic image, uses linear interpolation to calculate the Mura value corresponding to the inputted data signal; and for static image, uses non-linear interpolation to calculate the Mura value corresponding to the inputted data signal. As such, the Mura compensation effect is improved for static and low grayscale images; moreover, the memory speed requirement is reduced.

Mura compensation method for display panel

The present invention provides an OLED gate driving circuit structure, comprising an OLED panel, a gate charge/discharge driving circuit, a logic process unit and a source driving circuit; the gate charge/discharge driving circuit is located at one side of the OLED panel, and the gate charge/discharge driving circuit comprises a plurality of output ends, and each output end is electrically coupled to the logic process unit with one signal line; the logic process unit is located inside the OLED panel, and the logic process unit receives a scan signal transmitted by the gate charge/discharge driving circuit through the signal line, and converts the scan signal into a discharge scan signal and a charge scan signal to be provided to the OLED panel; the source driving circuit is coupled to the OLED panel, and provides a data signal to the OLED panel, and only one gate driving integrated circuit is utilized in the structure for achieving the charge and discharge procedures of the gate driving circuit to save the hardware cost and to simplify the panel layout circuit and to make the frame of the panel narrower.

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Shenzhen, China

Jimu Kuang