Transflective LCD with IPS Electrode Structure for Ambient Light Adaptation
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Solution Overview
Problem
Conventional liquid crystal displays face issues with image clarity in varying ambient light conditions, as transmissive displays are unclear in bright light and reflective displays are unclear in dim light, necessitating a solution that adapts to different lighting levels.
Innovation Solution
A transflective liquid crystal display with a thin film transistor on a substrate having a reflective and transmission region, utilizing a first dielectric layer with a through hole to expose the drain region, a common electrode, and a pixel electrode connected via the hole, generating a transverse electric field to drive liquid crystal molecules, enhancing viewing angle and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transmissive type display method is used, then the display can provide its own light source, but the displayed images are not clear when ambient light is brighter than the backlight module
Solution Approach 1:
The display panel is divided into two distinct regions: a transmission region that allows backlight to pass through for clear images in bright ambient light, and a reflective region that reflects ambient light for good visibility in dim lighting conditions. This segmentation enables the display to adapt to different ambient light levels by utilizing different regions appropriately.
Solution Approach 2:
The display dynamically switches between transmissive and reflective modes based on ambient light conditions. The transflective type liquid crystal display can act as a reflective type display when ambient light is strong and as a transmissive type display when ambient light is weak, providing adaptability to varying lighting environments.
2Adaptability or versatility
If a reflective type display method is used, then the display can use ambient light as a light source, but the displayed images are not clear when ambient light is dim
Solution Approach 1:
The display panel is divided into two distinct regions: a transmission region that allows backlight to pass through for clear images in bright ambient light, and a reflective region that reflects ambient light for good visibility in dim lighting conditions. This segmentation enables the display to adapt to different ambient light levels by utilizing different regions appropriately.
Solution Approach 2:
The display dynamically switches between transmissive and reflective modes based on ambient light conditions. The transflective type liquid crystal display can act as a reflective type display when ambient light is strong and as a transmissive type display when ambient light is weak, providing adaptability to varying lighting environments.
3Adaptability or versatility
If a conventional transflective type liquid crystal display is used, then the display can adapt to different ambient light levels, but the viewing angle is limited
Solution Approach 1:
The patent employs an in-plane switching (IPS) mode liquid crystal display structure where the liquid crystal molecules switch in the plane parallel to the substrate rather than tilting vertically. This dimensional change in the switching mechanism enables wider viewing angles while maintaining the transflective functionality for adapting to different ambient light levels.
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 transflective liquid crystal display effectively adapts to different ambient light levels by using ambient light when strong and a backlight when weak, improving viewing angle, contrast, and parallax, making it suitable for diverse lighting conditions.
Implementation Method 1
a transverse electric field is generated between the pixel electrode and the first common electrode to drive the liquid crystal molecule layer in the transmission region
Implementation Method 2
When the ambient light is strong, the transflective type liquid crystal display acts as a reflective type liquid crystal display and uses the ambient light to display images
Implementation Method 3
a liquid crystal molecule layer disposed between the first substrate and the second substrate
Data Source
AI summary
A transflective type liquid crystal display comprises a first substrate with a reflective region and a transmission region. A gate region, an insulation layer and a semiconductor layer are sequentially formed on the first substrate. The semiconductor layer has a source region, a drain region and a channel region. A first dielectric layer is disposed on the semiconductor layer and has a through hole to expose a part of the drain region. A first common electrode is disposed on the first dielectric layer and the through hole to cover the exposed part of the drain region. A reflective electrode is disposed on the first dielectric layer located in the reflective region. A second dielectric layer is disposed on the first common electrode and the reflective electrode. A pixel electrode is disposed on the second dielectric layer and connected to the drain region via the through hole.