Pixel Sensing Wiring Layout for Uniform OLED Compensation
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in compensating for pixel deterioration and changes in driving transistor characteristics, leading to differences in pixel characteristics due to sensing wiring placement.
Innovation Solution
A display device design that includes a display unit with pixels, first sensing wirings, and auxiliary voltage wirings. The first sensing wirings and auxiliary voltage wirings are arranged in a specific pattern to eliminate differences in pixel characteristics, with the auxiliary voltage wirings simulating the effect of sensing wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing wirings are placed adjacent to pixels for external compensation, then pixel characteristic measurement is improved, but characteristic uniformity across pixels deteriorates due to sensing wiring influence
Solution Approach 1:
The patent introduces auxiliary voltage wirings as intermediary elements that are electrically connected to each other and arranged between the sensing wirings and pixels. These auxiliary wirings act as a mediator to shield the pixels from the direct influence of sensing wirings, thereby eliminating the characteristic differences caused by sensing wiring placement while maintaining the ability to measure pixel characteristics accurately.
Solution Approach 2:
The patent creates a copied electrical structure by introducing auxiliary voltage wirings that replicate the function of voltage supply but are electrically isolated from the pixel sensing process. This copied structure allows the sensing wirings to perform their measurement function without directly influencing the pixel characteristics, thus resolving the contradiction between measurement precision and uniformity.
2Adaptability or versatility
If sensing wirings are electrically connected to pixels, then compensation function is improved, but pixel uniformity deteriorates due to electrical interference
Solution Approach 1:
The patent segments the electrical connection functions by separating the sensing wiring connections from the auxiliary voltage wiring connections. The sensing wirings are electrically separated from each other and connected to pixels for compensation, while the auxiliary voltage wirings are electrically connected to each other to provide stable voltage without direct pixel interference. This segmentation allows both functions to coexist without causing uniformity issues.
Solution Approach 2:
The auxiliary voltage wirings are electrically connected to each other to maintain equipotential conditions across the display panel. This creates a reference potential that stabilizes the electrical environment for pixel operation, reducing variations in pixel characteristics while allowing the sensing wirings to perform their compensation function independently.
Data Source
AI summary
Provided are a display device. The display device comprises: a display unit defined by a display area and a non-display area located outside the display area, and including pixels arranged in the display area, first sensing wirings electrically connected to the pixels, and auxiliary voltage wirings electrically separated from the pixels; and a sensing unit electrically connected to the first sensing wirings, wherein the first sensing wirings and the auxiliary voltage wirings extend in a first direction and are sequentially arranged along a second direction perpendicular to the first direction at first intervals, the first sensing wirings are spaced apart from each other along the second direction at second intervals greater than the first intervals and are electrically separated from each other, and the auxiliary voltage wirings are electrically connected to each other.