Transflective LCD Array Substrate Light Leakage Reduction
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Solution Overview
Problem
Transflective-type LCDs face issues with lower luminance and display quality due to light leakage when operating in reflective mode, as they reflect a portion of ambient light while allowing the remaining light to pass through the transmissive region.
Innovation Solution
The design incorporates a first substrate with a reflecting portion and a transmitting portion, featuring a light-reflecting layer with an opening for a transmitting window, an E-field reflecting section, and a pixel electrode connected through a contact hole and light-transmitting hole, enhancing reflectivity by altering the dielectric constant of the E-field reflecting layer with an applied electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the transflective-type LCD operates in reflective mode to reduce power consumption and improve outdoor display quality, then power consumption is reduced and outdoor display quality is improved, but light leakage occurs through the transmissive region resulting in lower luminance and poorer display quality
Solution Approach 1:
The pixel structure is segmented into distinct transmissive and reflective regions. The reflective region contains a reflective layer that directs light back through the same path, while the transmissive region allows light passage. This segmentation prevents light leakage by confining reflected light within its designated region and eliminating the mixing of light paths that causes display quality degradation.
Solution Approach 2:
A light blocking layer is introduced as an intermediary element between the reflective and transmissive regions. This layer prevents stray light from the reflective region from leaking into the transmissive region, thereby eliminating light leakage and improving display quality without affecting the power consumption benefits of reflective mode operation.
2Illumination intensity
If a light blocking layer is formed in the reflective region to prevent light leakage, then display quality is improved, but manufacturing complexity increases
Solution Approach 1:
The light blocking layer is merged with the existing reflective layer structure, forming an integrated component rather than a separate added element. This integration allows the light blocking function to be achieved using the same manufacturing processes already in place for creating the reflective layer, thereby improving display quality without significantly increasing manufacturing complexity.
Solution Approach 2:
The reflective layer is designed to serve multiple functions: it reflects light for display purposes and simultaneously acts as a light blocking layer to prevent light leakage. This multi-functionality eliminates the need for separate light blocking structures, maintaining manufacturing simplicity while achieving improved display quality through effective light leakage prevention.
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 improves luminance and display quality by effectively reflecting ambient light and transmitting backlight light, maintaining high reflectivity and transmissivity, thereby addressing the light leakage issue.
Implementation Method 1
An E-field reflecting section is formed under the transmitting window that reflects light when an electric field is applied
Implementation Method 2
enhancing reflectivity by altering the dielectric constant of the E-field reflecting layer with an applied electric field
Implementation Method 3
a light-reflecting layer with an opening corresponding to a transmitting window
Implementation Method 4
a transmitting portion transmitting the light generated by the backlight assembly
Data Source
AI summary
An LCD array substrate for a transflective-type LCD includes an E-field reflecting section formed under a transmitting window that reflects light when an electric field is applied. A gate line, a gate electrode and a transparent electrode are formed on a substrate. A channel layer between source and drain electrodes and an E-field reflecting layer are formed on the gate electrode and the transparent electrode, respectively. Portions of a protecting layer are removed to form a contact hole disposed over the drain electrode, and a light-transmitting hole over the E-field reflecting layer. A pixel electrode that is electrically connected to the drain electrode through the contact hole, makes contact with the E-field reflecting layer through the light-transmitting hole.