Transflective LCD Pixel Structure with Side-Placed Reflective Feature
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Solution Overview
Problem
Conventional transflective TFT LCDs have low backlight utilization efficiency due to the design of reflective layers, which increases production costs and limits the use of backlight sources for display.
Innovation Solution
A pixel structure for transflective TFT LCDs is developed, featuring a transparent substrate, a TFT, a reflective structure, a passivation layer, a pixel electrode, and a reflective layer, where the reflective structure is configured on one side of the TFT, allowing for improved backlight utilization without additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reflective layers are designed with rough surfaces to obtain widely distributed reflected lights, then light distribution is improved, but production cost increases
Solution Approach 1:
The reflective layer is divided into multiple segments with different surface characteristics. Some regions have rough surfaces for diffuse reflection, while other regions have smooth surfaces for specular reflection. This segmentation allows the system to achieve wide light distribution without requiring the entire reflective layer to be expensive rough surface material.
Solution Approach 2:
Different regions of the reflective layer are given different local qualities - some areas have rough surfaces optimized for diffuse reflection to spread light widely, while other areas maintain smooth surfaces for efficient specular reflection. This local differentiation optimizes both light distribution and manufacturing cost by applying rough surface treatment only where necessary.
2Illumination intensity
If reflective layers are designed to reflect front-light and ambient light, then reflective display performance is improved, but backlight utilization efficiency decreases
Solution Approach 1:
The display system dynamically adapts its reflective properties based on lighting conditions. The reflective layer can switch between modes optimized for front-light/ambient light reflection and modes optimized for backlight utilization, allowing the system to maintain high performance across different operating conditions without permanently sacrificing backlight efficiency.
Solution Approach 2:
The optical parameters of the reflective layer are changed based on the light source being used. When backlight is the primary source, the reflective layer parameters are optimized for backward reflection to maximize backlight utilization. When front-light or ambient light is used, the parameters shift to optimize for forward reflection, thus maintaining reflective display performance while improving backlight utilization when needed.
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 pixel structure enhances backlight utilization efficiency by allowing both transmitted and reflected light to contribute to the display, reducing production costs and improving overall light usage in transflective TFT LCDs.
Implementation Method 1
the reflective structure is configured at one side of the TFT and located in the reflective region of the transparent substrate
Implementation Method 2
A pixel structure for transflective TFT LCDs is developed, featuring a transparent substrate, a TFT, a reflective structure, a passivation layer, a pixel electrode, and a reflective layer
Data Source
AI summary
A pixel structure for a transflective LCD having a transparent region and a reflective region is provided. The pixel structure includes a transparent substrate, a TFT, at least one reflective structure, a passivation layer, a pixel electrode and a reflective layer. The TFT is disposed in a reflective region of the transparent substrate. The reflective structure is configured at one side of the TFT, and located in the reflective region of the transparent substrate. The passivation layer is disposed over the transparent substrate and covers the TFT and the reflective structure. The pixel electrode is disposed above the TFT and the reflective structure, and is at least located in a transparent region. The pixel electrode is electrically connected to the TFT. The reflective layer is disposed above the TFT and the reflective structure, and is located in the reflective region.