OLED Display Voltage Wire Contact Area Adjustment
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Solution Overview
Problem
Large-area OLED displays experience luminance non-uniformity and color coordinate deviation due to voltage drop in the driving voltage line, which affects the luminous efficiency of red, green, and blue pixels, leading to suboptimal image quality.
Innovation Solution
The OLED display employs a dual-layer voltage wire structure with auxiliary voltage wires that adjust contact areas based on the luminous efficiency of each pixel type, ensuring that the driving voltage is distributed uniformly across the panel, thereby compensating for differences in required current amounts and voltage drop ratios between red, green, and blue pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mesh structure driving voltage line is used to prevent voltage drop, then voltage distribution is improved, but color coordinate deviation and luminance non-uniformity increase due to different luminous efficiency characteristics of red, green, and blue pixels
Solution Approach 1:
The patent applies local quality by differentiating the contact areas between auxiliary voltage wires and color-specific voltage wires based on the luminous efficiency characteristics of each pixel type. Red pixels have a first contact area, green pixels have a second contact area, and blue pixels have a third contact area, where each contact area is specifically designed to compensate for the luminous efficiency differences of that color's OLED, thereby achieving uniform color coordinates across the display panel
Solution Approach 2:
The patent changes the geometric parameter (contact area) of the voltage wire connections to compensate for the luminous efficiency characteristics. By adjusting the contact areas of auxiliary voltage wires to be different from each other according to the luminous efficiency of red, green, and blue pixels, the system compensates for voltage drop differences and achieves uniform color coordinate output across the entire display panel
2Manufacturing precision
If different contact areas are used for auxiliary voltage wires corresponding to different pixel colors, then color coordinate deviation is reduced, but device structure complexity increases
Solution Approach 1:
The patent segments the voltage wire system into multiple independent components: color-specific voltage wires (first, second, and third voltage wires for red, green, and blue pixels respectively) and auxiliary voltage wires. Each segment can be independently designed with specific contact areas to compensate for the luminous efficiency characteristics of its corresponding pixel type, allowing precise control over voltage distribution while maintaining manageable structural complexity
Data Source
AI summary
An organic light emitting diode (OLED) display includes a display unit including first pixels emitting first color light, second pixels emitting second color light, and third pixels emitting third color light, and a power source voltage supplier supplying a driving voltage to the respective pixels of the display unit. The display further includes a first voltage wire transferring the driving voltage to the first pixels, a second voltage wire transferring the driving voltage to the second pixels, and a third voltage wire transferring the driving voltage to the third pixels. The first, second and third voltage wires being provided in a first layer. The display includes auxiliary voltage wires provided in a second layer different from the first layer. Contact areas between the first, second and third voltage wire and the auxiliary voltage wires are different from each other.