OLED Pixel Sensing Layout With Shared Gate Lines for Narrow Bezel
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Solution Overview
Problem
The size of the gate driving circuit in organic light emitting display devices increases proportionally with the number of pixel circuits sharing a sensing line, leading to a larger bezel area, as existing methods require equal numbers of gate signals for each pixel circuit.
Innovation Solution
A display device design where first and second pixel circuits share a data line and a sensing line, with a gate driving circuit outputting reduced numbers of gate signals to these circuits, allowing for shared gate lines and reduced bezel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gate driving circuit outputs gate signals for sensing equal to the number of pixel circuits sharing one sensing line, then each pixel circuit can be sensed individually, but the size of the gate driving circuit becomes larger
Solution Approach 1:
The patent merges the sensing operations of multiple pixel circuits by applying a common gate signal to multiple switch elements simultaneously. This allows pixel circuits sharing the same sensing line to be sensed using fewer gate signals, reducing the gate driving circuit size while maintaining sensing capability.
Solution Approach 2:
The gate signal is designed to serve multiple functions by controlling multiple switch elements across different pixel circuits simultaneously. This multi-functional approach reduces the total number of gate signals needed, thereby reducing the gate driving circuit area.
2Adaptability or versatility
If the gate driving circuit size increases, then more gate signals can be output for sensing, but the bezel area becomes larger
Solution Approach 1:
Multiple pixel circuits are grouped to share common gate lines for sensing operations. By combining the gate signal control for multiple circuits, the gate driving circuit size is reduced, which directly reduces the bezel area while preserving sensing flexibility through shared control lines.
3Measurement precision
If separate gate lines are used for each pixel circuit, then individual sensing is achieved, but the number of gate lines increases
Solution Approach 1:
The patent combines gate line connections so that a single gate line can control multiple switch elements in different pixel circuits simultaneously. This merging approach reduces the total number of gate lines required while maintaining the ability to sense individual pixel circuits through selective switching.
Solution Approach 2:
The sensing operation uses periodic gate signals that are applied in a specific sequence and timing pattern. By controlling the timing and period of gate signals, the system can selectively sense different pixel circuits using shared gate lines, reducing the number of physical lines needed.
Data Source
AI summary
The present disclosure relates to a display device and a pixel sensing method thereof, and more particularly, to a display device and a pixel sensing method thereof, which reduce the size of a bezel area by reducing the number of gate signals for sensing, being output from a gate driving circuit, and sense pixel circuits by the gate signals for sensing the number of which is reduced.