Sub-pixel Column Data Line Branching for Display Line Dim Reduction
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Solution Overview
Problem
Display devices, particularly organic light emitting display devices, experience line dim due to delayed charging of data voltage caused by parasitic capacitances and variations in components under data lines, leading to inconsistent luminance across sub-pixels.
Innovation Solution
The display device employs a matrix arrangement of sub-pixels with alternating first and second sub-pixels on odd-numbered columns and third sub-pixels on even-numbered columns, with data lines branching into sub-data lines on both sides, allowing for efficient data voltage distribution and charging during two horizontal periods, using a dot inversion driving method to minimize line dim.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If data lines transmit data voltage to sub-pixels, then image display is achieved, but line dim occurs due to delayed charging caused by parasitic capacitances
Solution Approach 1:
The patent segments the data lines into multiple sub-data lines by introducing MUX (multiplexer) units at regular intervals. Each MUX unit divides one data line into multiple sub-data lines that connect to different sub-pixels. This segmentation reduces the parasitic capacitance effect on each individual sub-data line, enabling faster and more uniform charging of data voltage across all sub-pixels, thereby eliminating line dim while maintaining proper image display
2Productivity
If components under data lines are changed, then device performance is improved, but charging delay time varies causing line dim
Solution Approach 1:
The patent implements local quality by making the data line structure uniform and regular across the entire display panel. All data lines are segmented at the same intervals with identical MUX unit configurations, ensuring that parasitic capacitance and charging characteristics are consistent throughout the panel. This regular segmentation structure ensures that even when components are changed to improve driving frequency, the charging time remains consistent across all sub-pixels, preventing line dim
Data Source
AI summary
The display device includes a display panel where sub-pixels are disposed. The display device includes a data driver that supplies a data voltage to the sub-pixels via data lines. The sub-pixels includes first sub-pixels to third sub-pixels. The first sub-pixels and second sub-pixels are alternately disposed on odd-numbered columns and the third sub-pixels are disposed on even-numbered columns. Each of the data lines branches into sub-data lines through a MUX, and the sub-data lines are disposed on both sides of the sub-pixels disposed on a column. Any one third sub-pixel of the third sub-pixels disposed on a row is connected to a sub-data line disposed on one side of the any one of third sub-pixel. Further, another third sub-pixel adjacent to any one third sub-pixel disposed on the row is connected to a sub-data line disposed on another side of the adjacent third sub-pixel. Thus, line dim is reduced.