Subpixel Wiring Layout for Luminance-Uniform OLED Displays
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Solution Overview
Problem
Display devices face issues with luminance uniformity due to characteristic deviations in driving transistors of sub pixels, leading to non-uniform luminance between sub pixels, and require multiple wiring lines that increase manufacturing costs and reduce aperture ratio and transmittance.
Innovation Solution
A display device design that combines multiple signal lines into fewer wiring lines, including a first wiring line for power/voltage, a second for reference voltage, and a third for data/sensing voltage, with transistors and light emitting diodes in each sub pixel, allowing for simultaneous threshold voltage sensing and separate voltage application during data writing, emission, and sensing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate wiring lines are used for power, reference voltage, and data signals, then each signal can be transmitted reliably, but the number of wiring lines increases which raises manufacturing cost and reduces aperture ratio
Solution Approach 1:
The patent combines multiple separate wiring lines (power line, reference voltage line, data line) into a single multi-functional wiring line that can transmit different signals at different time periods. This merging approach reduces the total number of wiring lines while maintaining reliable signal transmission through time-division multiplexing.
Solution Approach 2:
The wiring line is designed with multi-functionality to serve as power line, reference voltage line, and data line at different times. This universal design allows a single wiring line to perform multiple functions that previously required separate dedicated lines, thereby reducing device complexity.
2Reliability
If multiple separate wiring lines are used for power, reference voltage, and data signals, then signal transmission is reliable, but manufacturing cost increases
Solution Approach 1:
By merging multiple wiring lines into one multi-functional line, the patent reduces the quantity of materials and fabrication steps required, thereby lowering manufacturing cost while maintaining signal transmission reliability through proper timing control.
Solution Approach 2:
The multi-functional wiring line design eliminates the need for multiple separate wiring lines, reducing manufacturing complexity and cost while still providing reliable power, reference, and data signal transmission through time-division multiplexing.
3Adaptability or versatility
If multiple separate wiring lines are used, then all signals can be transmitted, but aperture ratio and transmittance are reduced
Solution Approach 1:
The patent merges multiple wiring lines into a single multi-functional line, reducing the total wiring area occupied in the display panel. This reduction in wiring area increases the aperture ratio (the ratio of light-emitting area to total area) and improves transmittance.
Solution Approach 2:
The multi-functional wiring line design allows the system to maintain full signal transmission capability (power, reference, data) while occupying less physical space, thereby increasing the aperture ratio and improving light transmittance through the display panel.
4Manufacturing precision
If characteristic deviation compensation is implemented, then luminance uniformity is improved, but additional wiring lines and complexity are required
Solution Approach 1:
The patent uses the multi-functional wiring line to also carry compensation signals for correcting characteristic deviations in driving transistors. By incorporating compensation functionality into the existing multi-functional line rather than adding separate dedicated lines, the system achieves luminance uniformity without proportionally increasing device complexity.
Data Source
AI summary
A display device includes a display panel which includes a plurality of sub pixels; a first wiring line which transmits a first power voltage or a turn-off voltage to each of the plurality of sub pixels; a second wiring line which transmits a second power voltage or a reference voltage to each of the plurality of sub pixels; a third wiring line which transmits a data voltage or a sensing voltage to each of the plurality of sub pixels; a plurality of light emitting diodes which is connected to the first wiring line; a first transistor which is connected to the second wiring line; a second transistor which is connected to the second wiring line; and a third transistor which is connected to the third wiring line.