Display Device Path Compensation Capacitors Luminance Uniformity
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Solution Overview
Problem
As display devices become higher resolution or larger, the increased number of data lines and varying lengths of transmission paths between the display driving circuit and the data lines can lead to distorted or delayed data signals, resulting in degraded display quality due to luminance deviations.
Innovation Solution
A display device is designed with a substrate that includes a main region for the display area and a sub-region protruding from one side, featuring a circuit layer with light emitting pixel drivers, data lines, demux circuits, and data transmission lines. The data transmission lines, particularly the second data transmission line, are electrically connected to a path compensation capacitor in the sub-region to compensate for luminance deviations caused by differences in transmission path lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines is increased to achieve higher resolution or larger display, then the display resolution or size is improved, but the transmission path length difference between data lines increases causing luminance deviations
Solution Approach 1:
The patent introduces path compensation capacitors with different capacitance values connected to different data lines. By adjusting the capacitance parameters of these capacitors, the signal transmission characteristics are modified to compensate for the varying path lengths, thereby maintaining luminance uniformity across the display while supporting higher resolution with increased data lines.
2Area of stationary object
If data lines with different transmission path lengths are used to cover the display area, then the display coverage area is improved, but signal distortion and delay occur resulting in degraded display quality
Solution Approach 1:
The patent applies different capacitance values of path compensation capacitors to different data lines based on their specific transmission path characteristics. Each data line receives a locally optimized capacitance value that compensates for its particular path length and signal characteristics, thereby maintaining signal transmission accuracy across the entire display area coverage.
3Manufacturing precision
If the transmission path length difference is reduced by adjusting data line layout, then luminance uniformity is improved, but the display area coverage or resolution is reduced
Solution Approach 1:
The patent introduces path compensation capacitors as intermediary components between the data lines and the pixel drivers. These capacitors act as mediators that compensate for the transmission path length differences electrically, allowing the data lines to maintain their optimized geometric layout for maximum display area coverage while achieving luminance uniformity through electrical compensation.
Data Source
AI summary
A display device includes a substrate, a circuit layer, and an element layer. The circuit layer includes: light emitting pixel drivers; data lines; demux circuits outputting the data signal of the data lines based on a data mux signal supplied from a display driving circuit; and data transmission lines electrically connected between the display driving circuit and the demux circuits, and transmitting data mux signals of the demux circuits, respectively. The data transmission lines include: a first data transmission line electrically connected to a first demux circuit adjacent to an edge of the substrate in a first direction; and a second data transmission line electrically connected to a second demux circuit spaced further apart from the edge of the substrate than the first demux circuit in the first direction. The second data transmission line is electrically connected to a path compensation capacitor in the sub-region.