Pixel circuit of organic luminous display as well as drive method thereof

A technology of light-emitting displays and pixel circuits, applied in static indicators, instruments, etc., can solve the problems of increasing the difficulty of gray scale adjustment, Vdata voltage writing, increasing the power consumption of drive chips, etc., so as not to affect the aperture ratio, reduce the Write voltage, effect of improving power consumption level

Inactive Publication Date: 2008-10-08
NANJING CEC PANDA LCD TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] the above figure 1 There are the following problems in the pixel circuit: (1) It needs a larger Vdata voltage to write
This will inevitably make the writing voltage of Vdata higher and increase the power consumption of the driver IC.
(2) The magnitude of the voltage drop of circuit node N1 is not only related to the threshold voltage, but also related to the turn-on time of TFT M3, and since the turn-on time is determined by the scan line VGn+1, the writing of Vdata also needs to consider the scan line Opening time increases the difficulty of grayscale adjustment

Method used

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  • Pixel circuit of organic luminous display as well as drive method thereof
  • Pixel circuit of organic luminous display as well as drive method thereof
  • Pixel circuit of organic luminous display as well as drive method thereof

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] The device TFT used in the circuit of the present invention has three electrodes, a gate, a second electrode, and a third electrode. The second and third electrodes can be called source electrode and drain electrode respectively, or the second and third electrodes can be called drain electrode and source electrode respectively, without changing the function or substantial connection relationship of the circuit. Due to the electrical symmetry in the circuit diagram, the second and third electrodes of the TFT are respectively referred to as the drain electrode and the source electrode in the embodiment of the present invention.

[0046] image 3 It is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.

[0047] See image 3, the pixel circuit in the embodiment of the present invention includes 5...

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Abstract

The present invention discloses a pixel circuit of an organic illuminated display device and a method for driving the pixel circuit; the pixel circuit comprises a first driving transistor, a second driving transistor, a storage capacitor, a coupling capacitor, and an organic light emitting diode (LED); the organic LED is driven by the first driving transistor. The method comprises the following steps: a. pre-charging: pre-charge the first drive transistor with pre-charge voltage, and holds the pre-charge voltage by means of the storage capacitor; b. storing a threshold voltage: the storage capacitor discharges the pre-charge voltage via the second drive transistor to the threshold voltage; c. writing grayscale data voltage: charge grayscale data voltage for the first drive transistor via the coupling capacitor, wherein, the grayscale data voltage is superimposed on the threshold voltage, and held by the storage capacitor. The pixel circuit and the driving method for the pixel circuit provided in the present invention can effectively suppress drifting of TFT property of the OLED unit in the organic illuminated display device, and thereby prolong the service life of the device.

Description

technical field [0001] The present invention relates to a pixel circuit of an organic light emitting display and a driving method thereof, in particular to a pixel circuit of an active organic light emitting display and a driving method thereof. Background technique [0002] An organic light emitting diode (OLED, Organic Light Emitting Diode) can be driven by a passive matrix (PM) or an active matrix (AM). Compared with the PM driver, the AM driver has the advantages of larger displayed information capacity, lower power consumption, longer device life, and higher picture contrast. The PM drive is suitable for low-cost, simple display devices. [0003] Currently, there are basically two types of devices for AM-driven OLED fabricated on glass substrates, namely amorphous silicon (a-Si) thin film transistor (TFT) and low temperature polysilicon (LTPS) TFT. TFT devices will drift in device characteristics when they work in a DC voltage bias state for a long time. If some meas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3225
Inventor 张晓建李俊峰
Owner NANJING CEC PANDA LCD TECH
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