Pixel Charging Circuit Adjusting Sub-Pixel Time for Display Uniformity
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Solution Overview
Problem
Current liquid crystal display panels exhibit bright and dark stripes due to varying charging rates of sub-pixels when displaying static solid-color frames, leading to poor frame uniformity, especially when using LED backlight sources.
Innovation Solution
A pixel charging method that adjusts the charging time of sub-pixels based on the state of the backlight source, with longer charging times when the backlight is on and shorter times when it's off, to maintain consistent charging rates and prevent flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the charging time of sub-pixels is kept constant regardless of backlight state, then the control is simple, but bright and dark stripes appear and frame uniformity deteriorates
Solution Approach 1:
The patent applies dynamics by making the charging time of sub-pixels variable rather than fixed. The charging time is dynamically adjusted based on the backlight state: when the backlight is on, sub-pixels use a first charging time; when the backlight is off, sub-pixels use a second charging time. This dynamic adjustment ensures consistent charging rates regardless of backlight conditions, eliminating bright and dark stripes while maintaining frame uniformity.
2Manufacturing precision
If the charging time of sub-pixels is adjusted according to backlight state, then frame uniformity is improved, but the control complexity increases
Solution Approach 1:
The patent implements feedback by using the backlight control signal as feedback information to adjust the sub-pixel charging time. The display control circuit receives the backlight control signal and uses it to determine whether to apply the first or second charging time to sub-pixels. This feedback mechanism enables automatic adaptation to backlight state changes, improving frame uniformity while keeping the control system manageable through a straightforward feedback loop.
3Reliability
If longer charging time is used for sub-pixels, then charging completeness is improved, but display response speed decreases
Solution Approach 1:
The patent applies parameter changes by varying the charging time parameter based on backlight state. Instead of using a consistently long charging time that would slow down display response, the system uses a longer first charging time only when the backlight is on (when more charging is needed), and a shorter second charging time when the backlight is off (when faster response is needed). This conditional parameter adjustment achieves both charging completeness and fast response speed.
Data Source
AI summary
The present disclosure relates to the field of display technology and, in particular, to a pixel charging method, a pixel charging circuit, a display device, and a display control method. The pixel charging method includes acquiring a state of a backlight source and adjusting a charging time of a sub-pixel corresponding to the backlight source according to the state of the backlight source. When the backlight source is in an on state, the charging time of the sub-pixel corresponding to the backlight source is a first charging time. When the backlight source is in an off state, the charging time of the sub-pixel corresponding to the backlight source is a second charging time, the second charging time being shorter than the first charging time.