Display Device Non-Uniform Electrode Area Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with polymer dispersed liquid crystal layers face degradation in display quality due to uneven luminance distribution, as the scattering of light varies significantly across pixels closer to and farther from the light-emitting elements, leading to reduced luminance and image quality.
Innovation Solution
The display device incorporates a configuration where the electrode area and scattering area of pixels are optimized, with the first pixel electrode having a smaller electrode area than the second pixel electrode, and the use of transparent resins overlapping the electrodes, to ensure uniform luminance distribution by adjusting the overlap areas and shapes of the electrodes and resins, thereby compensating for light attenuation and reducing undesired scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polymer dispersed liquid crystal layer is used as a light modulating layer, then light scattering function is achieved, but uneven luminance distribution occurs across pixels at different distances from the light-emitting element
Solution Approach 1:
The patent applies local quality by making the electrode areas of pixels non-uniform according to their position. Pixels closer to the light-emitting element have smaller electrode areas, while pixels farther away have larger electrode areas. This local variation in electrode area compensates for the position-dependent light attenuation, achieving uniform luminance across the display panel.
2Manufacturing precision
If transparent resins are added to overlap the electrodes, then scattering control is improved, but device structure becomes more complex
Solution Approach 1:
The patent uses composite materials by combining transparent resins with different refractive indices with the liquid crystal layer. The first transparent resin has a refractive index closer to the liquid crystal material, while the second transparent resin has a refractive index closer to the polymer material. This composite structure enables precise control of light scattering and luminance uniformity.
3Manufacturing precision
If electrode areas are reduced for pixels closer to the light-emitting element, then luminance uniformity is improved, but electrode design complexity increases
Solution Approach 1:
The patent applies local quality by making the electrode areas of pixels non-uniform according to their position. Pixels closer to the light-emitting element have smaller electrode areas, while pixels farther away have larger electrode areas. This local variation in electrode area compensates for the position-dependent light attenuation, achieving uniform luminance across the display panel.
Solution Approach 2:
The patent introduces a new design dimension by varying electrode areas in the planar direction rather than uniformly. This dimensional approach to electrode design allows compensation for optical path differences without increasing vertical structure 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 configuration achieves uniform luminance across the display panel, reducing the degradation of display quality by optimizing the scattering and electrode areas, ensuring consistent image quality regardless of the distance from the light-emitting elements.
Implementation Method 1
a light modulating element that exhibits scattering of or transparency to light have been proposed... The light modulating element is disposed behind a light guide and scatters light entering from a side surface of the light guide
Data Source
AI summary
According to one embodiment, a display device includes a light-emitting element, a first substrate including a first transparent substrate, a first pixel electrode, and a second pixel electrode, a second substrate including a second transparent substrate including a side surface opposing the light-emitting element and a common electrode overlapping the first pixel electrode and the second pixel electrode and a liquid crystal layer provided between the first substrate and the second substrate and containing a polymer and liquid crystal molecules, and the first pixel electrode is provided between the light-emitting element and the second pixel electrode, and an electrode area of the first pixel electrode is smaller than that of the second pixel electrode.