Scanning driver for active organic electroluminescent display and driving method thereof
A scan driver and luminescent technology, applied in the field of scan drive, can solve the problems of threshold voltage drift, power consumption mutation, single transmission type, etc., and achieve the effect of reducing driving difficulty, reducing additional power consumption, and avoiding coupling effects
Active Publication Date: 2014-12-31
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology
However, there are problems that have to be solved. Thin film transistors made on glass substrates have low mobility, single transmission type, all N-type or all P-type transistors, and threshold voltage drift when voltage is applied for a long time. It will cause some devastating results such as malfunction of the scan driver, sudden change in power consumption, and smaller output swing. Therefore, it is also a very big challenge when designing a scan driver.
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[0036] like figure 1As shown, the scanning driver of the active organic electroluminescence display includes N-level unit scanning drivers (the first level unit scanning driver 11 and the second level unit scanning driver 12 are shown in the figure; the third level unit scanning driver 13; the third level unit scanning driver 13; 4-level unit scan driver 14; 5th-level unit scan driver 15; 6th-level unit scan driver 16); each unit scan driver includes an input terminal IN, a clock signal input terminal CLK, a reset terminal RESET, and a first output terminal COUT and the second output terminal OUT; the input terminal IN of the first-level unit scanning driver receives the start input signal; the output signal of the first output terminal COUT of the 1st to N-1 level unit scanning driver is used as the next-level unit scanning driver The input signal of the input terminal IN; the output signal of the first output terminal COUT of the 2nd to N-level unit scan drivers is used as t...
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The invention discloses a scanning driver for an active organic electroluminescent display. The scanning driver comprises N levels of unit scanning drivers, wherein each unit scanning driver comprises an input signal sampling module, a signal coupling module, a circuit output level, and a circuit charge discharge module. The scanning driver only needs thin film transistors of one transmission type, so that improvement optimization is made on aspects of reduction of electric leakage access and extra power consumption. Each unit scanning driver only needs one external input, one clock control wire, one positive wire and two negative power wires, so driving difficulty is greatly reduced. Moreover, the output end is directly connected with a direct-current power supply, so that a coupling effect which is generated to output-stage transistor stray capacitance by clock jump and power consumption which is generated by charge-discharge of a capacitor are avoided.
Description
technical field [0001] The invention relates to the scanning driving technology of light-emitting diode display, in particular to the scanning driver of active organic electroluminescent display and its driving method. Background technique [0002] An organic light emitting diode (Organic Light Emitting Diode, OLED) display is a next-generation display technology with great development potential. The scan driver scans each row of pixels to ensure that the data of each frame of the display is updated. For active organic light-emitting diode displays, each pixel circuit needs peripheral scanning signals to control the writing and updating of grayscale data, and to realize the display function, which is an indispensable part of active display. The technical indicators of the scanning driver mainly include: speed, power consumption and drive capability, etc. [0003] The traditional scan driver adopts CMOS technology, which is made into a chip, and then the chip is pressed on ...
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IPC IPC(8): G09G3/32G09G3/3266
Inventor 吴为敬张立荣周雷徐苗王磊彭俊彪
Owner SOUTH CHINA UNIV OF TECH