Pixel Voltage Line Layout for OLED Brightness Uniformity
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Solution Overview
Problem
Organic light-emitting display apparatuses face issues with brightness differences due to voltage lines, particularly initialization voltage lines, which affect the uniformity and quality of the display.
Innovation Solution
The display apparatus incorporates a substrate with a first and second pixel circuit, each including a driving thin-film transistor and storage capacitor, connected to initialization voltage lines and a driving voltage line, with asymmetric or symmetric configurations to optimize voltage distribution and reduce brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If initialization voltage lines are used to initialize pixel circuits, then the display apparatus can perform initialization operation, but brightness differences occur due to voltage distribution issues
Solution Approach 1:
The initialization voltage line is divided into multiple segments (first initialization voltage line and second initialization voltage line) that are electrically connected through connection electrodes. This segmentation allows each segment to independently manage voltage distribution to different pixel circuits, reducing voltage drops and improving brightness uniformity across the display.
Solution Approach 2:
Connection electrodes are introduced as intermediary elements to electrically connect the segmented initialization voltage lines. These intermediaries ensure continuous voltage supply while enabling localized voltage management, thereby maintaining initialization functionality while reducing brightness differences.
2Quantity of substance
If voltage lines are extended to cover large display areas, then all pixel circuits can be initialized, but voltage drops cause brightness non-uniformity
Solution Approach 1:
The voltage distribution network is segmented into multiple initialization voltage line segments that can independently supply voltage to different regions of pixel circuits. This prevents voltage drops from affecting the entire display uniformly, allowing each segment to maintain adequate voltage levels for proper initialization and brightness uniformity.
3Device complexity
If a simple voltage line configuration is used, then device complexity is reduced, but brightness uniformity deteriorates
Solution Approach 1:
The initialization voltage line configuration extends from a simple linear arrangement to a two-dimensional network with segments arranged in both first and second directions. This dimensional expansion allows voltage to be distributed more evenly across the display area without significantly increasing overall structural complexity.
Data Source
AI summary
A display apparatus includes: a first pixel circuit on the substrate and including a first driving thin-film transistor and a first storage capacitor electrically connected to the first driving thin-film transistor; a second pixel circuit adjacent to the first pixel circuit and including a second driving thin-film transistor and a second storage capacitor electrically connected to the second driving thin-film transistor; a first initialization voltage line electrically connected to the first pixel circuit and the second pixel circuit; a second initialization voltage line electrically connected to the first initialization voltage line; and a driving voltage line between the first pixel circuit and the second pixel circuit, wherein a channel area of the first driving thin-film transistor or a channel area of the second driving thin-film transistor is between the second initialization voltage line and the driving voltage line.