Active matrix organic light emitting diode (AMOLED) pixel unit driving circuit and method, pixel unit and display device
A technology of a pixel unit and a driving circuit, which is applied in the field of pixel units, display devices, and AMOLED pixel unit driving circuits, can solve the problems of long charging time and slow charging speed, and achieve the effect of speeding up the charging speed.
Active Publication Date: 2012-10-03
BOE TECH GRP CO LTD +1
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Problems solved by technology
In the basic current-mode AMOLED pixel structure, Ioled is equal to Idata, and because Ioled must be within the working current range of the OLED, it is a small current, so Idata is also small, and the storage capacitor Cst is a large capacitor, and the charging speed is slow, especially in Under low gray scale, the charging time is very long, which is not suitable for AMOLED displays with high resolution and high refresh rate
Method used
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[0032] Such as figure 2 As shown, the present invention provides an AMOLED pixel unit driving circuit for driving an OLED, and the AMOLED pixel unit driving circuit includes:
[0033] A switch unit 21, the first input terminal is connected to the current source providing the charging current Idata, and the second input terminal is connected to the OLED;
[0034] Storage capacitor Cst, the first terminal is connected to the output terminal of the switch unit 21, and the second terminal is connected to the low level Vss;
[0035] The driving thin film transistor T1 and the current mirror thin film transistor T2, the gates are both connected to the first end of the storage capacitor Cst, and the source is connected to the low level Vss;
[0036] And the voltage dividing thin film transistor T3, the gate is connected to the first end of the storage capacitor Cst, the source is connected to the drain of the driving thin film transistor T1, and the drain is connected to the OLED; ...
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The invention provides an active matrix organic light emitting diode (AMOLED) pixel unit driving circuit, an AMOLED pixel unit driving method, a pixel unit and a display device. The AMOLED pixel unit driving circuit comprises a switch unit, a storage capacitor, a driving thin film transistor, a current mirror thin film transistor and a voltage share thin film transistor, wherein the first input end of the switch unit is connected with a current source for supplying charging current; the second input end of the switch unit is connected with an OLED; the first end of the storage capacitor is connected with the output end of the switch unit; the second end of the storage capacitor is connected to a low level; gates of the driving thin film transistor and the current mirror thin film transistor are connected with the first end of the storage capacitor, and sources of the driving thin film transistor and the current mirror thin film transistor are connected to the low level; and the gate of the voltage share thin film transistor is connected with the first end of the storage capacitor, the source of the voltage share thin film transistor is connected with the drain of the driving thin film transistor, and the drain of the voltage share thin film transistor is connected with the OLED. By adopting a current mirror structure and a voltage share mode, the zooming proportion of the charging current Idata to current Ioled flowing through the OLED is relatively large, so that the Ioled is in a working current range of the OLED, and the Idata may be relatively high; and therefore, the charging speed of the storage capacitor is increased.
Description
technical field [0001] The present invention relates to display driving technology, in particular to an AMOLED pixel unit driving circuit and method, a pixel unit and a display device. Background technique [0002] The AMOLED can emit light because it is driven by the current generated when the driving TFT is in a saturated state, that is, the current drives to emit light. figure 1 It is a schematic diagram of the existing basic current mode AMOLED (active matrix organic light emitting diode panel) pixel structure. Such as figure 1 As shown, the existing basic current mode AMOLED pixel structure includes OLED, T1, T2, T3, T4 and storage capacitor Cst, wherein T1 is a driving thin film transistor, T2, T3, T4 are controlling thin film transistors, the gate of T2 and the gate of T3 The gate is connected to the control line for outputting the control signal CN1, and the gate of T4 is connected to the control line for outputting the control signal CN2. In the existing current ...
Claims
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Login to View More IPC IPC(8): G09G3/32H05B44/00
CPCY02B20/347G09G3/32G09G3/325H05B33/0896H05B45/60Y02B20/30
Inventor 谭文祁小敬
Owner BOE TECH GRP CO LTD