Time-Divisional Display Driver Sequence for Brightness Uniformity
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Solution Overview
Problem
High-resolution display panels face challenges in electrical connections and amplifier size due to increased signal lines, leading to uneven drive voltages and brightness issues, particularly with time-divisional driving techniques.
Innovation Solution
A method for driving N×3 pixels along scanning lines, where the drive sequence of one line differs from an adjacent line, and G pixels are driven earliest or latest to spatially distribute voltage changes, reducing uneven brightness based on human vision's spectral luminous efficacy characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of signal lines is increased to achieve higher resolution, then the display resolution is improved, but the intervals between adjacent signal lines are significantly decreased making it difficult to provide sufficient spacing between external wirings
Solution Approach 1:
The patent merges multiple signal lines (specifically three signal lines) into a single physical wiring path by time-divisional driving. The driver circuit sequentially drives different signal lines through a shared amplifier and external wiring connection, eliminating the need for separate external wirings for each signal line and thus resolving the spacing issue while maintaining high resolution
2Adaptability or versatility
If the number of amplifiers is increased to drive more signal lines, then the driving capability is improved, but the size of the driver increases and thus the cost increases
Solution Approach 1:
The patent implements multi-functionality by designing a single amplifier to serve multiple signal lines through time-divisional driving. The same amplifier circuit is sequentially applied to drive different signal lines (e.g., R, G, B signal lines) at different time periods, allowing one amplifier to perform the work of multiple amplifiers and thus reducing driver size and cost
3Area of stationary object
If time-divisional driving is used to reduce amplifier数量, then the driver size is reduced, but uneven drive voltages and brightness issues occur
Solution Approach 1:
The patent applies periodic action by implementing a cyclic drive sequence that systematically varies the driving order across different scanning lines. The drive sequence is periodically changed based on the line number, ensuring that pixels on different lines experience different driving timings, which distributes voltage changes uniformly and prevents localized brightness abnormalities
Solution Approach 2:
The patent implements local quality by applying different drive sequences to different scanning lines. Specifically, lines with even indices use one drive sequence while lines with odd indices use another, allowing each line to be optimized for its specific position and characteristics, thereby achieving uniform drive voltage distribution across the entire display panel
Data Source
AI summary
A method is provided for driving a display panel including N×3 pixels arranged along each of a plurality of lines extending in a scanning line direction with N being an integer equal to or more than 2, the N×3 pixels constituting first to Nth pixel sets each comprising an R pixel associated with red, a G pixel associated with green, and a B pixel associated with blue. The method is composed of time-divisionally driving the N×3 pixels positioned in each of the plurality of lines. A drive sequence of an nth line out of the plurality of lines is different from that of an (n+1)th line out of the plurality of lines, the (n+1)th line being adjacent to the nth line. The G pixels, each included within associated one of the first to Nth pixels sets, are driven (N+1)th earliest or later for each of the nth and (n+1)th line.