OLED Pixel Height Variation with Linear Select Lines
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Solution Overview
Problem
Existing OLED display designs face challenges in optimizing pixel sizes for varying colored pixels within the same row or column, leading to increased resistance and area requirements for signal lines, making it impractical to adjust emitting areas without bending signal lines.
Innovation Solution
An active matrix OLED display configuration where pixels in the same row or column can have differing heights and widths, with select lines positioned outside the emitting areas to maintain linear signal line routing, allowing for optimized emitting area sizes without bending signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixels in the same row or column have different sizes to optimize current density and efficiency, then pixel efficiency and display lifetime are improved, but signal line routing becomes complex requiring bends which increase resistance
Solution Approach 1:
The patent positions select lines outside the emitting areas of pixels in the row direction, allowing pixels of different sizes to be arranged in the column direction without requiring signal line bends. This dimensional reorganization enables varying pixel heights while maintaining linear signal line routing, resolving the contradiction between pixel size optimization and signal line complexity.
2Productivity
If pixels have different emitting areas to balance current density across colors, then efficiency is improved, but the area required for signal lines increases
Solution Approach 1:
By positioning select lines outside the emitting areas and allowing pixels to vary in height (column direction) rather than width (row direction), the patent enables efficient use of pixel area while maintaining compact, linear signal line routing. This dimensional approach optimizes pixel efficiency without increasing signal line area requirements.
3Adaptability or versatility
If select lines are positioned within emitting areas to accommodate varying pixel sizes, then pixel size optimization is achieved, but signal line resistance increases due to bending
Solution Approach 1:
The patent positions select lines outside the emitting areas in the row direction, enabling pixels to have different heights in the column direction without requiring select line bends. This dimensional separation maintains signal line integrity and low resistance while still allowing pixel size optimization for different colors and efficiencies.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables reduced resistance and surface area requirements for signal lines, allowing for balanced pixel efficiency and extended display lifetime by optimizing emitting areas for differently colored pixels without compromising signal line integrity.
Implementation Method 1
an organic electroluminescent (EL) device is comprised of an anode for hole injection, a cathode for electron injection, and an organic media sandwiched between these electrodes to support charge recombination that yields emission of light
Data Source
AI summary
An active matrix OLED display has pixels with light emitting areas arranged in rows and columns and includes; a first pixel having a first height in the column direction and disposed in a first column of pixels and in a first row of pixels; a second pixel having a second height in the column direction and disposed in the first column of pixels and in a second row of pixels wherein the second row of pixels is adjacent to the first row of pixels and the first height being different than the second height; and a first select line arranged to drive only the first row of pixels and a second select lines spaced from the first select line arranged to drive only the second row of pixels wherein the emitting areas of the first and second pixels are disposed between the first and second select lines.