OLED Pixel Column Layout With Color-Matched Data Line Resistance
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Solution Overview
Problem
In organic light-emitting display devices, the arrangement of pixels in a stripe form with a black matrix reduces the aperture ratio and image quality, especially for high-resolution images. Additionally, existing pixel structures do not effectively manage the resistance of data lines, leading to uneven color representation and potential defects like a greenish tint in images.
Innovation Solution
A display device with a substrate having a display area and a non-display area, featuring a pixel arrangement with alternating red, blue, and green pixels. The data lines are strategically coupled to pixel columns based on color, with the line or contact structure of the data line coupled to the pixel column with greater resistance influence having a lower resistance than the remaining data lines. This is achieved by varying the width and length of the data lines and the number of contact holes in the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data lines are uniformly designed across all pixel columns, then manufacturing is simple, but resistance differences cause color display defects
Solution Approach 1:
The patent applies local quality by designing different data line configurations for different pixel columns based on their specific resistance characteristics. Data lines coupled to pixel columns with greater resistance influence have lower resistance (achieved through greater width or shorter length), while other data lines have higher resistance. This localized differentiation compensates for resistance variations and ensures uniform color display across the display device.
Solution Approach 2:
The patent changes physical parameters of data lines (width, length, number of contact holes) to adjust their resistance values. By varying these parameters, the patent creates data lines with different resistance characteristics matched to the specific needs of each pixel column, thereby compensating for resistance differences and improving color display accuracy.
2Ease of manufacture
If stripe form pixel arrangement with black matrix is used, then pixel structure is simple, but aperture ratio and image quality deteriorate
Solution Approach 1:
The patent employs asymmetry by arranging pixels in non-stripe patterns (such as PenTile matrix structures) where different pixel types are distributed asymmetrically across the display. This asymmetric arrangement eliminates the need for black matrices between pixels, thereby improving aperture ratio and image quality while maintaining manufacturing feasibility.
3Reliability
If data line resistance is not compensated, then device complexity is low, but color uniformity and image fidelity deteriorate
Solution Approach 1:
The patent applies local quality by designing different data line configurations for different pixel columns based on their specific resistance characteristics. Data lines coupled to pixel columns with greater resistance influence have lower resistance (achieved through greater width or shorter length), while other data lines have higher resistance. This localized differentiation compensates for resistance variations and ensures uniform color display across the display device.
Solution Approach 2:
The patent changes physical parameters of data lines (width, length, number of contact holes) to adjust their resistance values. By varying these parameters, the patent creates data lines with different resistance characteristics matched to the specific needs of each pixel column, thereby compensating for resistance differences and improving color display accuracy.
Data Source
AI summary
A display device includes a substrate, a pixel area, and a plurality of data lines. The substrate includes display and non-display areas. The pixel area is in the display area and includes a first pixel column and a second pixel column. The pixels in the first and second columns emit light of different colors. The data lines are respectively coupled to the first pixel column and the second pixel column. In the non-display area, a data line is coupled to one of the first or second pixel columns corresponding to a color on which influence of a resistance is greater than on another color. The data lines has a line or contact structure with a resistance less than a resistance of a line or contact structure of a remaining data line coupled to a remaining pixel column.