Regional Pixel Circuits for Expanded Displays Without Luminance Loss
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Solution Overview
Problem
Existing display devices suffer from a decrease in luminance due to a reduction in pixel density when the display area is expanded by reducing the non-display area.
Innovation Solution
The display device incorporates a substrate with a circuit layer featuring first and second pixel circuit regions and a driving circuit part, along with a display layer comprising first, second, and third display element regions, where the second and third regions have expanded light emitting areas and increased current supply, supported by wider channel widths and transistors to maintain luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is reduced to expand the display area, then the display region size is increased, but the pixel density decreases causing luminance reduction
Solution Approach 1:
The patent applies local quality by creating different pixel circuit configurations in different regions. Specifically, pixel circuits adjacent to the driving circuit part have their light emitting regions extended in the row direction, while other pixel circuits maintain standard configurations. This localized modification ensures that pixels in the third display element region (overlapping the driving circuit part) receive sufficient current to maintain luminance, while other regions can benefit from the expanded display area.
Solution Approach 2:
The patent changes physical parameters of the pixel circuits to resolve the contradiction. The light emitting region area is increased for specific pixel circuits (those adjacent to the driving circuit part), and the channel width of driving transistors is increased to provide higher current. These parameter changes compensate for the reduced pixel density in the expanded display region, maintaining luminance while increasing overall display area.
2Area of stationary object
If the pixel circuit density is decreased to expand display area, then the display region is enlarged, but the current supply to each pixel is insufficient
Solution Approach 1:
The patent implements local quality by providing enhanced current supply only to pixel circuits that require it. Pixel circuits adjacent to the driving circuit part have their light emitting regions extended and are supplied with higher current through increased channel width transistors. Other pixel circuits maintain standard current supply levels, optimizing power distribution across the expanded display area.
Solution Approach 2:
The patent modifies the channel width parameter of driving transistors in specific regions to increase current supply capacity. By increasing the channel width (W/L ratio) of transistors in pixel circuits adjacent to the driving circuit part, the patent ensures sufficient current delivery to the expanded display region without unnecessarily increasing power consumption in other regions.
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 prevents a decrease in luminance even when the display area is expanded, ensuring consistent image quality by maintaining pixel density and current supply.
Implementation Method 1
The display element may include an organic light emitting element
Data Source
AI summary
A display device includes a substrate, a circuit layer disposed on the substrate, and which includes a pixel circuit part having a first pixel circuit region and a second pixel circuit region, and a driving circuit part that is adjacent to the pixel circuit part, and a display layer disposed on the circuit layer, and which includes including a first display element region that overlaps the first pixel circuit region, a second display element region that overlaps the second pixel circuit region, and a third display element region that overlaps the driving circuit part, pixel circuits formed in the first pixel circuit region supply a first current to display elements formed in the first display element region, and pixel circuits formed in the second pixel circuit region supply a second current to display elements formed in the second and third display element regions.