Display Device Boundary Visibility Suppression
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Solution Overview
Problem
Existing display devices, particularly those using OLEDs, struggle to achieve high contrast ratios due to the visibility of boundaries between light-emitting and non-light-emitting regions during black luminance emission.
Innovation Solution
A display device with a pixel array that includes first pixels for displaying image information and second pixels in a non-display area. The second pixels emit black color light and have a gradually decreasing light intensity from the innermost circumference adjacent to the first pixels to the outermost circumference, achieved through various optical and electrical adjustments such as resistor connections, capacitance ratios, and optical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED is used as a self-luminous display element, then high contrast ratio can be achieved, but light emission efficiency decreases and power consumption increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of pixels based on their location. Second pixels in the non-display area are configured to emit light with gradually decreasing intensity from the innermost circumference toward the outermost circumference. This creates a gradient effect that locally optimizes the display characteristics to reduce boundary visibility while maintaining overall energy efficiency.
2Illumination intensity
If black luminance is emitted using OLED, then high contrast can be achieved, but boundary visibility increases due to light emission at the edge
Solution Approach 1:
The patent implements local quality by configuring second pixels in the non-display area to emit light with varying intensity based on their position. The innermost second pixels emit at the same intensity as first pixels, while outermost second pixels emit at lower intensity. This spatially-dependent light emission creates a gradient that masks the boundary between display and non-display areas.
Solution Approach 2:
Instead of making the boundary more pronounced, the patent inverts the approach by making the boundary less visible. The second pixels emit light in a direction opposite to the conventional expectation - they emit light that gradually decreases outward, creating a fade-out effect that inverts the typical high-contrast boundary problem into a smooth transition zone.
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 the contrast difference at the boundary between the display area and the non-display area, minimizing the visibility of the boundary and enhancing the immersive experience in AR and VR applications.
Implementation Method 1
a light emitting element that emits light when a current flows
Data Source
AI summary
Visibility of a boundary at a screen end is suppressed. A display device includes a first pixel and a second pixel in a pixel array in which pixels are arranged in a two-dimensional array. The first pixel is arranged in a display area for displaying image information. The second pixel is arranged in a non-display area arranged in a peripheral area existing outside the display area. Furthermore, the second pixel can emit black color light, and the intensity of light to be emitted gradually decreases from the pixel arranged on the innermost circumference adjacent to the first pixel toward the pixel arranged on the outermost circumference opposite to the display area.