Foldable Display Pixel Layout for Uniform Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foldable display apparatuses experience luminance differences and increased parasitic capacitance in the folding area due to tensile or compressive stress, leading to luminance degradation.
Innovation Solution
The foldable display apparatus is designed with varying aperture ratios and thicknesses of sub-pixels in the folding and non-folding areas, with reduced aperture ratios and increased thickness of light emitting layers in the folding area to minimize parasitic capacitance and luminance deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the aperture ratio of sub-pixels in the folding area is reduced, then parasitic capacitance is decreased, but display area is reduced
Solution Approach 1:
The patent applies different aperture ratios to sub-pixels based on their location: sub-pixels in the folding area have a first aperture ratio while sub-pixels in the non-folding area have a second aperture ratio. This local differentiation allows the folding area sub-pixels to have reduced aperture ratios (minimizing parasitic capacitance) while non-folding area sub-pixels maintain larger aperture ratios (maximizing display area), thereby resolving the contradiction between reliability and display area.
2Reliability
If the thickness of light emitting layers in the folding area is increased, then parasitic capacitance is reduced, but manufacturing complexity is increased
Solution Approach 1:
The patent specifies that light emitting layers in sub-pixels located in the folding area have a first thickness while light emitting layers in sub-pixels located in the non-folding area have a second thickness. This local thickness differentiation allows folding area sub-pixels to have increased thickness (reducing parasitic capacitance effects) while maintaining manufacturing feasibility through localized process control, thus resolving the contradiction between reliability and manufacturing complexity.
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 design effectively reduces luminance differences and parasitic capacitance, maintaining consistent luminance across the folding and non-folding areas, enhancing the reliability and image quality of the display.
Implementation Method 1
a light emitting layer which emits light in response to an applied voltage
Implementation Method 2
When a tensile or compressive stress was generated in the folding area of the foldable display apparatus, an electrical stress may be generated in the light emitting layer of the pixel
Data Source
AI summary
A foldable display apparatus includes: a non-folding area, and a folding area, in which an aperture ratio of a plurality of red sub pixels in the folding area is lower than an aperture ratio of a plurality in red sub pixels of the non-folding area, an aperture ratio of the plurality of green sub pixels in the folding area is lower than an aperture ratio of the plurality of green sub pixels of the non-folding area, and an aperture ratio of the plurality in blue sub pixels of the folding area is lower than an aperture ratio of the plurality of blue sub pixels of the non-folding area.