RGBW Display Driver Circuit Reduces Color Shift
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Solution Overview
Problem
Conventional RGBW display panels experience color shift and reduced display quality due to RC delay during the display of solid colors, leading to erroneous charging and increased energy consumption.
Innovation Solution
A driver circuit structure for RGBW display panels is introduced, where driving TFTs are arranged on both sides of data lines and scan lines are divided into groups for interlaced scanning, ensuring that each data line only controls sub-pixels of the same color during specific scan line groups, reducing the number of signal switches and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scan lines continuously switch data signals during solid color display, then all sub-pixels can be updated, but RC delay causes erroneous charging and color shift
Solution Approach 1:
The scan lines are divided into two groups (odd-numbered and even-numbered), and sub-pixels are segmented by color type. Each data line controls only sub-pixels of the same color during a group scan period, preventing cross-color interference and erroneous charging caused by RC delay.
Solution Approach 2:
The patent performs preliminary classification of sub-pixels by color before scanning. By pre-organizing which data lines control which color sub-pixels, the system avoids the need for continuous signal switching that causes RC delay effects, thereby preventing color shift before it occurs.
2Productivity
If data lines control multiple color sub-pixels, then pixel structure is compact, but data signals switch frequently increasing energy consumption
Solution Approach 1:
The patent segments the control function by dividing scan lines into groups and assigning each data line to control only sub-pixels of a specific color within its group. This segmentation reduces the frequency of data signal switches while maintaining comprehensive coverage of all sub-pixels, thereby lowering energy consumption without sacrificing scan efficiency.
3Illumination intensity
If conventional RGBW pixel layout is used, then aperture ratio is improved, but RC delay causes whitening phenomenon during solid color display
Solution Approach 1:
The patent applies segmentation to both the spatial layout and temporal scanning. Spatially, it maintains the compact RGBW pixel structure for high aperture ratio. Temporally, it segments scan lines into groups and data line control into color-specific periods, ensuring that each data line drives only same-color sub-pixels during its active period, thereby preventing RC delay-induced whitening while preserving luminance benefits.
Data Source
AI summary
The invention provides a driver circuit structure for RGBW display panel, by arranging the driving TFTs on both sides of the data line to control the corresponding sub-pixels and disposing the plurality of scanning lines into two or four groups for interlaced scanning so that any data line only controlling sub-pixels of the same color during the time a group of scan lines being turned on. As such, the present invention can effectively improve the color shift when displaying solid color screen, improve the display quality, reduce the number of switches of data signal in the data line and reduce energy consumption.