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An OLED pixel circuit and an image display device

A pixel circuit and reset circuit technology, which is applied in the field of OLED pixel circuits and image display devices, can solve the problems of uneven display and characteristic drift of OLED displays, and achieve the effects of improving display effect, small circuit area, and ensuring display effect

Inactive Publication Date: 2019-05-28
SEEYA OPTRONICS LTD
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Problems solved by technology

However, when the OLED pixel circuit updates each frame of image, the setting of the voltage maintaining circuit may make the gate of the driving transistor always maintain at the data voltage, which may be relatively high. Therefore, it may The characteristic drift of the driving transistor due to long-term high-voltage driving results in uneven display of the OLED display

Method used

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  • An OLED pixel circuit and an image display device

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Embodiment Construction

[0032] As mentioned in the background technology section, when the OLED pixel circuit in the prior art updates each frame of image, the setting of the voltage maintenance circuit may make the gate of the driving transistor always maintain the data voltage, which may be relatively high Therefore, the characteristics of the driving transistor may drift due to long-term high-voltage driving, resulting in uneven display of the OLED display.

[0033] An embodiment of the present invention proposes an OLED pixel circuit. By setting the first reset circuit, after the OLED pixel circuit uses the data voltage to update the driving current, the voltage of the control terminal of the driving transistor is reset to the first reset voltage, so as to prevent the driving transistor from being Long-term driving under high voltage will cause the flight characteristics to drift.

[0034] In order to make the above objects, features and beneficial effects of the present invention more comprehensib...

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Abstract

The invention discloses an OLED pixel circuit and an image display device. The OLED pixel circuit comprises an OLED element, a driving transistor, a voltage maintaining circuit and a first reset circuit, The control end of the driving transistor is directly or indirectly connected with data voltage, the driving transistor is suitable for generating driving current according to the data voltage andoutputting the driving current through the output end of the driving transistor, and the driving current is used for driving the OLED element to emit light. The voltage maintaining circuit is suitable for maintaining the voltage of the control end of the driving transistor; And the first reset circuit is coupled with the control end of the driving transistor and is suitable for resetting the voltage of the control end of the driving transistor to a first reset voltage in response to a reset control voltage after the OLED pixel circuit updates the driving current by using the data voltage. Byadopting the technical scheme of the invention, the characteristic drift of the driving transistor in the OLED pixel circuit can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of image display, in particular to an OLED pixel circuit and an image display device. Background technique [0002] Compared with conventional Liquid Crystal Display (LCD), Organic Light-Emitting Diode (OLED) has a different light-emitting mechanism, with self-illumination, wide viewing angle, almost infinitely high contrast, low Advantages such as power consumption and extremely high response speed. According to the driving method, OLED can be divided into passive (Passive Matrix) OLED (abbreviated as PMOLED) and active (Active Matrix) OLED (abbreviated as AMOLED). [0003] Generally, the number of pixels (or pixel density) is used to measure the fidelity of a display. The number of pixels represents the number of pixels per inch (Pixels Per Inch, PPI for short). The higher the PPI value, the higher the density of the display and the higher the fidelity. Generally speaking, the higher the PPI, the higher...

Claims

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Application Information

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IPC IPC(8): G09G3/3208
Inventor 钱栋吴桐刘波
Owner SEEYA OPTRONICS LTD
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