Pixel Circuit Time-Division Drive Voltage Drop Reduction
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Solution Overview
Problem
Conventional color display devices experience deterioration in display quality and reduced power efficiency due to voltage drops in power supply wiring.
Innovation Solution
A pixel circuit with three subpixel regions, where one drive circuit supplies current to all light-emitting elements in time division, and power supply lines are arranged to reduce resistance and voltage drop, including a blanket electrode connected over the matrix for efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply wiring is used in conventional color display devices, then power supply voltage is delivered to drive circuits, but voltage drop occurs in the power supply wiring leading to deterioration in display quality and reduced power efficiency
Solution Approach 1:
The pixel circuit is divided into three subpixel regions (red, green, blue), and the drive circuit is disposed only in one subpixel region. This segmentation allows power supply lines to be routed through regions without drive circuits, reducing resistance and voltage drop while maintaining reliable power delivery to all subpixels.
Solution Approach 2:
The power supply line is extended into the second subpixel region, utilizing the spatial dimension of the pixel structure. By routing the power supply line through a region not occupied by the drive circuit, the patent creates an optimized power distribution path that reduces voltage drop without increasing overall circuit area.
2Adaptability or versatility
If drive circuit is disposed in each subpixel region, then each light-emitting element can be driven independently, but power supply wiring becomes longer and resistance increases causing voltage drop
Solution Approach 1:
The drive circuits for all three light-emitting elements are merged into a single drive circuit disposed in one subpixel region. This single drive circuit controls all subpixels by selectively applying drive current to different light-emitting elements, reducing the number of power supply lines needed and minimizing voltage drop.
Solution Approach 2:
The single drive circuit performs multiple functions by controlling all three light-emitting elements. It can independently drive each subpixel while sharing common power supply infrastructure, achieving both independent control capability and reduced power supply wiring length.
3Power
If power supply line is routed through first subpixel region containing drive circuit, then power supply is delivered to drive circuit, but wiring resistance increases due to limited space
Solution Approach 1:
Different regions of the pixel are assigned different functions: the first subpixel region contains the drive circuit for control functions, while the second subpixel region is optimized for power supply routing. This local differentiation allows the power supply line to be routed through a region with more available space, reducing wiring resistance and improving power delivery efficiency.
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 reduces voltage drop in power supply wiring, enhancing display quality and power efficiency by optimizing the layout and power distribution within the pixel circuit.
Implementation Method 1
three light-emitting elements that are disposed in mutually different subpixel regions among the three subpixel regions and have mutually different luminescent colors
Data Source
AI summary
A pixel circuit disposed in a pixel region including three subpixel regions includes: three light-emitting elements that are disposed in the subpixel regions and have mutually different luminescent colors; one drive circuit that is disposed in a subpixel region serving as a first subpixel region, and supplies drive current to the three light-emitting elements in time division; and a positive power supply line serving as a first power supply line that is disposed in a subpixel region serving as a second subpixel region, and supplies power supply voltage to the drive circuit.