Display Power Wiring Adjustment Circuits for Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face issues with luminance differences between light-emitting elements due to varying lighting rates, leading to decreased display quality, increased resistance, excessive voltage drops, and reduced yield due to resistance elements connected in series with common anode and cathode lines.
Innovation Solution
A display device with subpixels, including pixel circuits, a frame region, and adjustment circuits connected to power supply voltage wiring lines, controlled by a control circuit to manage current values based on image data, reducing luminance differences and minimizing resistance and voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If resistance elements are connected in series to common anode and cathode lines to increase resistance, then power consumption is reduced at high lighting rates, but luminance uniformity deteriorates and yield decreases
Solution Approach 1:
The patent divides the single resistance control into multiple segment resistance elements (first resistance element in common anode line, second resistance element in common cathode line). This segmentation allows distributed resistance control across different wiring segments, reducing the impact of single-point failures and improving luminance uniformity while maintaining power consumption benefits.
Solution Approach 2:
The patent applies resistance elements at specific locations in the wiring structure (first resistance element in common anode line, second resistance element in common cathode line) rather than uniformly throughout. This local placement optimizes voltage distribution and luminance uniformity in different regions of the display panel while maintaining overall power efficiency.
2Power
If resistance elements are connected in series to common anode and cathode lines, then voltage drop is controlled at high lighting rates, but unnecessary resistance increase occurs
Solution Approach 1:
The total resistance is segmented into multiple resistance elements distributed across common anode and cathode lines. This segmentation allows for optimized voltage drop control at specific locations without unnecessarily increasing the total resistance of the entire wiring structure, thereby maintaining power delivery efficiency.
Solution Approach 2:
The resistance elements act as intermediary components that mediate voltage distribution in the wiring structure. By placing resistance elements strategically in common anode and cathode lines, the patent controls voltage drop without causing excessive resistance increase that would harm overall power delivery.
3Illumination intensity
If resistance elements are connected in series to common anode and cathode lines, then contrast is improved at low lighting rates, but display quality deteriorates due to luminance differences
Solution Approach 1:
The patent segments the resistance control into multiple resistance elements positioned in different wiring segments. This segmentation enables finer control over voltage distribution across the display panel, improving luminance uniformity by compensating for local variations while maintaining contrast performance.
Solution Approach 2:
By placing resistance elements at specific locations in the wiring structure, the patent addresses local luminance variations in different regions of the display panel. This local quality adjustment ensures uniform luminance across the entire panel while preserving contrast ratio through controlled voltage distribution.
Data Source
AI summary
A display device includes a plurality of subpixels that include pixel circuits respectively including light-emitting elements, a display region that includes the plurality of subpixels, a frame region that is provided outside the display region, first power supply voltage wiring lines for supplying a high potential side power supply to the pixel circuits, second power supply voltage wiring lines for supplying a low potential side power supply to the pixel circuits, one or more adjustment circuits each of which includes a switching element and an adjustment element and is connected to the first power supply voltage wiring lines and the second power supply voltage wiring lines, and a control circuit that controls a current value of the adjustment element in accordance with image data.