Pixel circuit, pixel circuit driving method and display device
A pixel circuit and input circuit technology, which is applied in the field of pixel circuits and display devices, can solve the problems of low display brightness, long minimum light-emitting time, and low minimum gray scale, so as to maintain stability, reduce minimum light-emitting time, and stabilize gray scale display effect
Active Publication Date: 2021-07-09
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology
[0004] However, the high-gray-scale micro-LED light-emitting circuit designed by digital pulse width modulation + analog voltage modulation has the following two problems: (1) In the comparison light-emitting stage, the comparison result needs to be transmitted by one more transistor before it can be turned off The current causes the minimum light-emitting time to be too long, making the minimum gray scale displayed on the screen not low enough, which affects the minimum display brightness of the screen
(2) During the process of emitting light, both the pulse width modulation signal for controlling the luminous intensity and the analog voltage modulation signal for controlling the luminous intensity act on the gate of the drive tube, which will cause the leakage of other branches to cause the luminous current to decrease continuously, The brightness of the screen is continuously reduced during the lighting process
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[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0024] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more than one, unless otherwise clearly and specifically defined.
[0025] In the...
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The invention discloses a pixel circuit, a driving method of the pixel circuit and a display device, relates to the technical field of display, and is used for ensuring the lowest display brightness of display and ensuring that more stable gray scale display is realized in a light emitting process. The pixel circuit comprises a driving circuit, a comparison circuit, a first data input circuit, a second data input circuit, a light emitting device, a first node, a second node and a third node. One end of the first data input circuit is electrically connected with the analog voltage modulation end, and the other end is electrically connected with the control end of the driving circuit through a first node. One end of the second data input circuit is electrically connected with the pulse width modulation end, and the other end is electrically connected with the control end of the comparison circuit through a second node. The output end of the comparison circuit is electrically connected with the input end of the driving circuit through the third node, and the output end of the driving circuit is electrically connected with the light-emitting device.
Description
technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit, a driving method for the pixel circuit and a display device. Background technique [0002] At present, since the micro light emitting diode panel has smaller device size, faster response speed, higher luminous efficiency, stronger stability and longer service life than the active matrix organic light emitting diode panel Advantages, the field of display applications based on micro-light-emitting diodes has developed rapidly. [0003] In the pixel circuits of the existing micro-light-emitting diode panels, most of the traditional 2T1C pixel circuits are used with micro silicon-based CMOS (Complementary Metal Oxide Semiconductor, Complementary Metal Oxide Semiconductor) drivers to achieve high grayscale display, and the current pixel circuits Most of the driving methods adopt digital pulse width modulation + analog voltage modulation driving mode. [000...
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IPC IPC(8): G09G3/32
CPCG09G3/32G09G2320/0626
Inventor耿玓黄施捷苏悦季寒赛陈倩卢年端李泠刘明
OwnerINST OF MICROELECTRONICS CHINESE ACAD OF SCI