AMOLED pixel driving circuit and driving method
A pixel driving circuit and pixel technology, applied in instruments, static indicators, etc., can solve problems such as changes in the brightness of organic light-emitting diodes, and achieve the effects of improving display uniformity, improving display quality, and improving brightness changes
Active Publication Date: 2019-02-01
SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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Problems solved by technology
[0007] The purpose of the present invention is to provide an AMOLED pixel driving circuit, which can improve the problem of the brightness change of the organic light-emitting diode caused by the parasitic capacitance between the gate and the drain of the switching thin film transistor when the scanning signal controls the switching thin film transistor to turn off, and improves display quality
[0008] Another object of the present invention is to provide a method for driving an AMOLED pixel, which can improve the problem of the brightness change of the organic light-emitting diode caused by the parasitic capacitance between the gate and the drain of the switching thin film transistor when the scanning signal controls the switching thin film transistor to turn off , to improve display quality
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[0051] see Figure 5 , and combined with image 3 and Figure 4 , is the first embodiment of the AMOLED pixel driving method of the present invention, and is applied to the first embodiment of the AMOLED pixel driving circuit of the present invention, including the following steps:
[0052] Step S1, set n to be a positive integer, the scan signal G(n) on the scan line 20 of the nth row is a constant voltage low potential VGL, control the first P-type TFT T1 in the sub-pixel 10 of the nth row to be turned on, and control The voltage switching module 40 connected to the sub-pixel 10 in the n-th row inputs the first power supply positive voltage OVDD1 to the source of the second TFT T2 in the sub-pixel 10 in the n-th row, and the multi-column data line 30 inputs the data signal to the n-th row The gate of the second TFT T2 of the sub-pixel 10.
[0053] Specifically, in the step S1, the scanning signal G(n) on the scanning line 20 in the nth row is changed from a constant volta...
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The invention provides an AMOLED pixel driving circuit and a driving method. According to the AMOLED pixel driving circuit provided in the invention, a voltage switching module is arranged corresponding to each row of subpixels; the voltage switching module is connected with the corresponding row of subpixels and a scanning line corresponding to the row of subpixels; the scanning signals on the scanning line control the corresponding voltage switching module to provide different power voltage to the row of subpixels when a switching thin film transistor in the corresponding row of subpixels isconducted and cut off, and thus, variation of a voltage difference between a gate and a source of a driving thin film transistor caused as parasitic capacitance exists between the gate and the drainof the switching thin film transistor in the case when the switching thin film transistor becomes cutoff from conduction is thus compensated, current flowing through an organic light-emitting diode isensured to be stable, the display uniformity of the sub pixels is enhanced, and the display quality is enhanced.
Description
technical field [0001] The invention relates to the field of display technology, in particular to an AMOLED pixel driving circuit and a driving method. Background technique [0002] Organic light emitting diode (Organic Light Emitting Display, OLED) display device has self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, wide operating temperature range, and can realize flexible display and With many advantages such as large-area full-color display, it is recognized by the industry as a display device with the most potential for development. [0003] OLED display devices can be divided into passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED) two categories according to the driving method, namely direct addressing and thin film transistor (Thin Film Transistor, TFT) matrix addressing two types. Among them, AMOLED has pixels arranged in ...
Claims
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Login to View More IPC IPC(8): G09G3/3258
CPCG09G3/3258G09G3/3233G09G3/3266G09G2300/0842G09G2300/0866G09G2300/0819G09G2320/0233G09G2320/0219G09G2330/028G09G2310/0278G09G2320/0223G09G2320/0626
Inventor 文殊温亦谦
Owner SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD