OLED Display Anode Reset Layout for VRR Ripple Control
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Solution Overview
Problem
Display devices, particularly OLED devices, experience defects due to ripples in the anode reset voltage (VAR) during variable refresh rate (VRR) operation, leading to performance issues.
Innovation Solution
A display device design with a substrate layout that includes a first and second anode reset line in alternating pixel rows, connected in a mesh structure, and utilizes oxide semiconductor transistors to stabilize the anode reset voltage, combined with a storage capacitor to maintain data voltage during frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single anode reset line is used for all pixels in a row, then the device complexity is reduced, but voltage ripples occur causing display defects
Solution Approach 1:
The patent divides the anode reset line into multiple independent lines (first anode reset line and second anode reset line) that are alternately connected to different pixels in adjacent rows. This segmentation prevents voltage ripples from affecting all pixels simultaneously, thereby maintaining display quality while managing device complexity through structured division.
2Adaptability or versatility
If variable refresh rate operation is implemented, then power consumption is reduced and adaptability is improved, but anode reset voltage ripples cause display defects
Solution Approach 1:
By segmenting the anode reset line into multiple independent lines activated at different times, the patent enables variable refresh rate operation without voltage ripples. Different anode reset lines are used for different rows during VRR operation, allowing flexible refresh rate adjustment while maintaining display quality through temporal and spatial separation of reset operations.
Solution Approach 2:
The patent implements periodic activation of different anode reset lines in alternating rows during variable refresh rate operation. This periodic action pattern allows the display to operate at different refresh rates while preventing voltage ripples by systematically alternating which anode reset line is active, thereby maintaining reliability during adaptability enhancements.
3Stability of the object's composition
If mesh structure is used for anode reset lines, then voltage stability is improved, but manufacturing complexity increases
Solution Approach 1:
The mesh structure segments the anode reset lines into multiple independent paths (first and second anode reset lines) with alternating connections. This segmentation provides multiple voltage supply paths that stabilize the anode reset voltage by preventing ripple propagation, while the systematic alternating pattern keeps manufacturing complexity manageable through regular structure repetition.
Data Source
AI summary
Disclosed is a display device that is driven in a variable refresh rate (VRR) manner and is capable of preventing occurrence of defects in a display panel caused by occurrence of a ripple in an anode reset voltage VAR. In one aspect, a display device includes a substrate on which a plurality of pixels is disposed in a column direction and a row direction; a first anode reset line disposed in each row in which a first subset of pixels among the plurality of pixels are located; and a second anode reset line disposed in each row in which a second subset of pixels among the plurality of pixels are located.