Display Pixel Reference Voltage Wiring for Luminance Consistency
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Solution Overview
Problem
IR drop (voltage drop) in power supply wiring can lead to reduced luminance in display devices due to wiring resistance, affecting the performance of current-driven light emitting elements.
Innovation Solution
A display device design that includes a reference voltage supply wiring extending in the pixel region, with lead-out wirings connected to gradation voltage generation units at specific positions, allowing the generation of gradation voltages based on the reference voltage supplied from these lead-out wirings, and incorporating multiple gradation voltage generation units and lead-out wirings to manage voltage levels across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power supply wiring is used to supply voltage to pixels, then power supply is achieved, but voltage drop occurs due to wiring resistance causing luminance reduction
Solution Approach 1:
The patent applies local quality by providing multiple lead-out wirings at different positions along the reference voltage supply wiring, allowing each pixel to receive a reference voltage that is locally adjusted according to its position. This compensates for the voltage drop caused by wiring resistance, as pixels farther from the power supply unit receive reference voltage from lead-out wirings positioned to minimize the voltage drop path.
2Device complexity
If reference voltage is supplied from a single position, then wiring is simplified, but voltage levels vary across the display area causing luminance inconsistency
Solution Approach 1:
The patent segments the reference voltage supply by providing multiple lead-out wirings at different positions along the reference voltage supply wiring. Each lead-out wiring serves a specific region of pixels, dividing the large-scale voltage distribution into smaller, more controlled segments. This segmentation allows each pixel to receive appropriately adjusted reference voltage for its local position, maintaining luminance consistency across the entire display area.
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
The solution effectively suppresses luminance decreases by generating appropriate gradation voltages based on the position of pixels relative to the reference voltage supply, thereby maintaining consistent luminance across the display.
Implementation Method 1
IR drop (voltage drop) may occur due to wiring resistance of the power supply wiring
Data Source
AI summary
To suppress a decrease in luminance. A display device includes: a plurality of pixels (10); a gradation voltage generation unit (40A, 40B) that generates a gradation voltage; a reference voltage supply wiring (611) at least partially extending in a pixel region (20) in which the plurality of pixels (10) is arranged, the reference voltage supply wiring (611) supplying a reference voltage to the pixels (10); and a lead-out wiring (70A, 70B) electrically connected to the reference voltage supply wiring (611) at a voltage lead-out position (Pv) on the reference voltage supply wiring (611), in which the gradation voltage generation unit (40A, 40B) generates the gradation voltage on the basis of the reference voltage supplied from the lead-out wiring (70A, 70B).