Transflective LCD Pixel Refracting Patterns Light Reflection
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Solution Overview
Problem
Conventional reflective LCD panels struggle to maintain image quality in low-light environments and face power wastage issues due to the trade-off between reflective and transmissive light ratios in transflective LCD panels.
Innovation Solution
A transflective pixel structure with a reflective and transmissive region, featuring an organic material layer with refracting patterns and a refracting material layer, and bumps underneath the reflective region, which increases the light reflecting ratio by refracting external light into the reflective region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the area of the reflective electrical conductive thin film is increased to increase the light reflecting ratio, then the light reflecting ratio is improved, but the opening ratio of the transmissive portion is reduced
Solution Approach 1:
The patent introduces a vertical dimension by adding a refractive index gradient layer above the reflective thin film. This layer has a refractive index that decreases with height, creating optical effects that enhance light reflection without requiring additional horizontal area. This dimensional transition allows the system to achieve higher reflectivity while maintaining the same pixel area allocation.
Solution Approach 2:
The patent changes the optical parameter (refractive index) of the material layer positioned above the reflective film. By creating a gradient where the refractive index decreases from bottom to top, the system optimizes light reflection efficiency. This parameter modification allows the existing reflective film area to be more effective, thereby improving the light reflecting ratio without expanding the film's physical area and compromising the transmissive opening ratio.
2Illumination intensity
If the opening ratio of the transmissive portion is increased to maintain image output quality, then the image output quality is improved, but the brightness of the backlight source must be increased resulting in more power wastage
Solution Approach 1:
The refractive index gradient layer acts as a self-service optical element that passively enhances light reflection by utilizing the natural optical properties of materials with varying refractive indices. The structure automatically optimizes light path without requiring additional active components or increased backlight brightness, thereby maintaining image quality while avoiding increased power consumption.
3Adaptability or versatility
If a transflective LCD panel integrates reflective and transmissive portions, then the display can output good images in both sufficient and insufficient external light conditions, but the light reflecting ratio is reduced due to the transmissive portion area
Solution Approach 1:
The patent adds a vertical optical dimension through the refractive index gradient layer, which enhances the reflection performance of the transmissive portion. This allows the transmissive area to contribute more effectively to light reflection, thereby improving the overall light reflecting ratio of the pixel without reducing the transmissive area needed for adaptability to different lighting conditions.
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
Enhances light reflecting ratio and brightness while reducing power consumption by effectively utilizing external light in both sufficient and insufficient lighting conditions.
Implementation Method 1
the organic material layer disposed over the transmissive region of the pixel electrode comprises a plurality of refracting patterns on its upper surface
Implementation Method 2
The light reflection of the pixel from external light source is used as the light source for displaying images
Data Source
AI summary
A transflective pixel structure including a scan line, a data line, a thin film transistor, a pixel electrode and an organic material layer is provided. The scan line and the data line are disposed over a substrate. The thin film transistor is disposed over the substrate and electrically connected to the scan line and the data line. The pixel electrode is disposed over a substrate and is electrically connected to the thin film transistor. The pixel electrode has a reflective region and a transmissive region. The organic material layer covers both the thin film transistor and the pixel electrode. The organic material layer disposed correspondently above the transmissive region of the pixel electrode has a plurality of refracting patterns on its upper surface.