OLED Pixel Aperture Proportional to Capacitance for Uniform Boundary Luminance
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Solution Overview
Problem
Conventional flat panel display devices exhibit a visible stepped shape at the boundary between the display area and the bezel area, making them unsuitable for non-rectangular shapes.
Innovation Solution
The display device incorporates subpixels with storage capacitors of varying capacitance values in the active and boundary areas to maintain consistent luminance across different aperture ratios, using a substrate with non-rectangular shapes and adjusting capacitor values proportionally to aperture ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional rectangular flat panel display devices are used, then manufacturing and design are simple, but they cannot accommodate non-rectangular shapes and show visible stepped shapes at boundaries
Solution Approach 1:
The patent applies local quality by differentiating the treatment of subpixels in the boundary area from those in the active area. Specifically, subpixels in the boundary area are designed with different aperture ratios and compensated with different capacitance values in storage capacitors, while subpixels in the active area maintain uniform characteristics. This localized differentiation enables non-rectangular shape adaptation without requiring complete redesign of the entire display structure.
2Adaptability or versatility
If deformed display devices with non-rectangular shapes are developed, then shape versatility is improved, but visible stepped shapes appear at the boundary area
Solution Approach 1:
The patent employs parameter changes by adjusting the capacitance values of storage capacitors in subpixels located in the boundary area. These capacitance values are specifically modified to compensate for the reduced aperture ratios of boundary subpixels, ensuring that their luminance characteristics match those of subpixels in the active area. This parameter adjustment eliminates visible stepped shapes at the boundary while maintaining non-rectangular display shapes.
3Shape
If subpixels with different aperture ratios are used in boundary areas, then non-rectangular shapes are achieved, but luminance uniformity deteriorates
Solution Approach 1:
The patent implements feedback compensation by using storage capacitors with specifically designed capacitance values to compensate for luminance differences in boundary subpixels. The capacitance values are calculated based on the aperture ratios of individual subpixels, creating a feedback mechanism that equalizes luminance output across all subpixels despite their different physical apertures. This feedback approach maintains luminance uniformity while enabling non-rectangular display shapes.
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 approach eliminates the visibility of stepped shapes and ensures uniform luminance across the display, accommodating non-rectangular forms.
Implementation Method 1
a capacitance value of storage capacitors included in first subpixels arranged in the active area and a capacitance value of storage capacitors included in second subpixels arranged in a boundary area between the active area and the non-active area are set to be different
Data Source
AI summary
A display device includes a substrate having an active area and a non-active area; a plurality of first subpixels arranged in the active area; and a plurality of second subpixels arranged adjacent to a boundary area between the active area and the non-active area, wherein the first and second subpixels have storage capacitors that have different capacitance values from each other, so that visibility of the stepped shape generated in the boundary area can be eliminated.