OLED Display Data Line Spacing for Cross-Talk Reduction
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Solution Overview
Problem
OLED display devices face challenges in achieving higher resolution due to limitations in the number of output terminals in the driver circuit, leading to increased write time delays and cross-talk effects, especially in small-sized devices.
Innovation Solution
The configuration includes a matrix of main pixels with scanning lines and data lines arranged in specific directions, allowing for a smaller number of data lines and wider spacing between them, which reduces cross-talk and improves write time efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines is increased to achieve higher resolution, then the resolution is improved, but the distance between data lines and pixel circuits decreases, increasing cross-talk effects
Solution Approach 1:
The patent introduces emission control lines as a third dimension of control, independent from the traditional scanning lines and data lines. This allows data lines to be spaced farther apart while maintaining high resolution through the additional control dimension provided by emission control lines, thereby reducing cross-talk effects.
Solution Approach 2:
The patent segments the control function into three independent dimensions: scanning lines for row selection, data lines for column selection, and emission control lines for sub-pixel control. This segmentation allows each line type to be optimized independently, enabling larger spacing between data lines to reduce cross-talk while maintaining high resolution.
2Measurement precision
If the number of output terminals in the driver circuit is increased to support higher resolution, then the resolution is improved, but the device complexity increases
Solution Approach 1:
The emission control lines serve multiple functions: they control the timing of light emission from sub-pixels, enable the reduced data line configuration, and work in conjunction with scanning lines to achieve high resolution. This multi-functionality reduces the need for additional dedicated output terminals.
Solution Approach 2:
The patent changes the control parameter structure by introducing emission control signals that operate independently from traditional scanning and data signals. This parameter change allows the driver circuit to achieve high resolution control with fewer output terminals by utilizing the additional control dimension.
3Device complexity
If rendering technology is used to reduce the number of data lines, then the number of output terminals is reduced, but the write time increases due to demultiplexer operation delays
Solution Approach 1:
The emission control lines are configured to pre-select which sub-pixels should be active before data is written to the display. This preliminary action allows data to be written more efficiently without requiring complex demultiplexer operations, reducing write time delays.
Solution Approach 2:
The emission control lines act as an intermediary between the driver circuit and the sub-pixels, enabling efficient data writing by pre-establishing which sub-pixels are ready to receive data. This intermediary control mechanism reduces the operational delays associated with demultiplexer-based rendering approaches.
Data Source
AI summary
A sub-pixel for a second color is disposed to be adjacent to a sub-pixel for a first color in a row direction. A sub-pixel for a third color is disposed to be adjacent to the sub-pixel for the first color in a column direction. Each of the sub-pixels for the first color, the sub-pixels for the second color, and the sub-pixels for the third color is connected with one of the scanning lines and one of the data lines. Number of main pixels per row is M and number of main pixels per column is N. Number of the scanning lines is (3/2)N. Number of sub-pixels connected with each of the scanning lines is 2M. Number of the data lines is 2M. Number of main pixels connected with each of the data lines is N. Number of sub-pixels connected with each of the data lines is (3/2)N.