Display Panel Sub-Pixel Driving for Color Shift and Graininess
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Solution Overview
Problem
Existing display panels face a challenge where alleviating color shift at large viewing angles results in a grainy picture due to increased sub-pixels in low-brightness states.
Innovation Solution
A display panel configuration with a driving unit controlling first, second, and third sub-pixels, where the driving unit alternates between two display gray scales for the first and second sub-pixels in different frames, and uses a third gray scale for the third sub-pixels, ensuring the first display gray scale is greater than or equal to the third, and the second display gray scale is less than or equal to the third.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels in low-brightness state are increased to suppress brightness change at side view, then color shift at large viewing angles is improved, but picture clarity deteriorates and grainy feeling increases
Solution Approach 1:
The patent applies dynamics by alternating the brightness states of first and second sub-pixels between different frames. In odd frames, first sub-pixels are in high-brightness state while second sub-pixels are in low-brightness state; in even frames, this is reversed. This dynamic switching allows the display to maintain picture clarity while compensating for color shift at large viewing angles, as the human eye integrates the alternating states to perceive correct brightness without grainy artifacts.
2Speed
If refresh frequency is increased to 120 Hz, then display smoothness is improved, but charging time of each sub-pixel is reduced resulting in insufficient charging
Solution Approach 1:
The patent segments the sub-pixels into three groups (first sub-pixels, second sub-pixels, and third sub-pixels) with different driving schemes. Third sub-pixels are driven at normal refresh frequency with sufficient charging time, while first and second sub-pixels are alternated between high and low brightness states. This segmentation allows the display to achieve 120 Hz refresh frequency for smooth display while ensuring that third sub-pixels receive adequate charging time.
Solution Approach 2:
The patent implements periodic action by alternating the brightness states of first and second sub-pixels between odd and even frames. This periodic switching allows the display to maintain high refresh frequency for smooth visual output while providing sufficient charging time during the low-brightness periods, as liquid crystal molecules have time to stabilize before the next high-brightness period begins.
3Measurement precision
If 8K resolution is implemented, then display detail is improved, but number of pixels increases resulting in reduced refresh time per frame
Solution Approach 1:
The patent segments the high-resolution display into three types of sub-pixels (first, second, and third) with different driving strategies. Third sub-pixels are driven with complete charging cycles at the full 120 Hz refresh rate, ensuring sufficient charging time despite the high pixel count. First and second sub-pixels use alternating brightness states to reduce the charging burden, allowing 8K resolution to be maintained with adequate refresh time per frame.
Data Source
AI summary
The present application provides a display panel, a driving method thereof, and an electronic device, wherein the electronic device includes the display panel, and the driving method of the display panel is used to drive the display panel, a driving unit of the display panel drives first sub-pixels and second sub-pixels to display alternately with a first display gray scale and a second display gray scale, and drives third sub-pixels to display with a third gray scale value, so as to alleviate a problem of serious color shift at large viewing angles and improve clarity of a displayed picture.