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Light emitting control circuit and driving method thereof, display panel and display device

A technology of lighting control circuit and driving method, which is applied to static indicators, instruments, etc., can solve the problems that the effective pulse duty cannot be guaranteed to change continuously, the effective pulse duty ratio of the lighting control signal can be adjusted arbitrarily, and the viewing experience is reduced.

Active Publication Date: 2017-11-17
WUHAN TIANMA MICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the lighting control circuit is usually composed of cascaded shift registers, in order to ensure the validity of the output signals of the shift registers, the effective pulse duty cycle of the lighting control signals output by the shift registers at all levels cannot be adjusted arbitrarily.
However, when the dimming mode in the prior art is used to adjust the brightness of the display panel, since the effective pulse duty of the light-emitting control signal controlling each row of pixels in the adjustment process cannot guarantee a continuous change, the brightness of the display panel changes stepwise. , reducing the viewing experience

Method used

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  • Light emitting control circuit and driving method thereof, display panel and display device
  • Light emitting control circuit and driving method thereof, display panel and display device
  • Light emitting control circuit and driving method thereof, display panel and display device

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Embodiment Construction

[0045] Embodiments of the present invention provide a lighting control circuit, a driving method thereof, a display panel and a display device, for smooth adjustment of display brightness of the display panel.

[0046]In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

[0047] It should be noted that in the following description, specific details are set forth in order to fully understand the present invention. However, the present invention can be implemented in many other ways than those describ...

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Abstract

The invention discloses a light emitting control circuit and a driving method thereof, a display panel and a display device. The light emitting control circuit comprises multiple cascaded shift registers, wherein an input signal end of the first-level shift register is connected with an initial signal end, and a frame initial signal of a valid level having set duration is inputted by the initial signal end to the first-level shift register. When brightness of the display panel is adjusted, 4N units of duration is taken as a step to prolong or shorten duration of the valid level of the frame initial signal based on the present frame initial signal, and light emitting control signals outputted by the various-level shift registers are made to correspondingly prolong or shorten same duration of the valid level. When the 4N units of duration is taken as the step to adjust duration of the valid level of the frame initial signal, brightness step type change of the display panel can be avoided, brightness adjustment of the display panel is made to be smoother, and display brightness is more uniform.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a lighting control circuit, a driving method thereof, a display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) is currently a hot spot in the field of display panel research. Compared with Liquid Crystal Display (LCD), OLED display has low energy consumption, self-illumination, wide viewing angle and fast response speed. Etc. At present, OLED displays have begun to replace traditional LCD displays in display fields such as mobile phones, tablet computers, and digital cameras. Unlike LCDs that use voltage to control brightness, OLEDs are driven by current and require a stable current to control their light emission. Generally, an OLED display drives the OLED to emit light through a driving transistor in a pixel circuit. The pixel circuit generally needs a gate drive signal and a light emission control signal to drive at the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3208
CPCG09G3/3208
Inventor 向东旭李玥蔡中兰陈泽源
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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