Transreflective LCD Uniform Cell Gap Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transreflective liquid crystal display devices face challenges in maintaining high contrast and resolution due to alignment defects and increased manufacturing complexity, particularly in high-resolution panels, caused by the formation of steps between reflecting and transmitting regions, and the need for additional processing steps like forming transparent step films.
Innovation Solution
A liquid crystal display device with a uniform cell gap between reflecting and transmitting regions, using P-type liquid crystal molecules that align perpendicularly when no electric field is applied, and a linear pixel electrode with a conductive reflecting film overlapping the electrode, allowing for optimized optical characteristics without multi-gap structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a multi-gap structure with transparent step films is formed to optimize optical characteristics, then the optical performance is improved, but the manufacturing complexity and number of steps increase
Solution Approach 1:
The patent employs a single-gap structure where the cell gap is uniform across both reflecting and transmitting regions. This homogeneous gap design eliminates the need for transparent step films and multi-gap fabrication processes, thereby reducing manufacturing complexity while maintaining optimal optical characteristics through a different structural approach involving the reflecting film configuration
Solution Approach 2:
The invention extracts and removes the transparent step film component from the structure. By eliminating this element, the patent avoids the associated manufacturing steps and complexity while achieving the desired optical performance through the single-gap configuration with strategically positioned reflecting films
2Illumination intensity
If transparent step films are formed in reflecting regions to change cell gap, then optical characteristic is optimized, but the arrangement of reflecting regions is restricted
Solution Approach 1:
The patent uses a uniform cell gap across the entire display panel, including both reflecting and transmitting regions. This homogeneous gap structure removes the constraint imposed by transparent step films, allowing reflecting regions to be arranged flexibly according to design requirements without being limited by gap variation requirements
Solution Approach 2:
The invention segments the reflecting function into discrete reflecting films that can be independently positioned and patterned within the single-gap structure. This segmentation allows flexible arrangement of reflecting regions without requiring coordinated gap changes, enabling adaptive design for various display configurations
3Volume of moving object
If a step is formed between reflecting region and transmitting region, then cell gap can be adjusted, but alignment defect occurs and light leaks
Solution Approach 1:
The patent maintains a homogeneous cell gap throughout the entire panel, eliminating steps between reflecting and transmitting regions. This uniform gap structure ensures consistent liquid crystal alignment across all regions, preventing alignment defects and light leakage while achieving the desired optical characteristics through reflecting film design rather than gap variation
Solution Approach 2:
The invention converts the potential harm of uniform gap (which might seem to limit optical optimization) into a benefit by demonstrating that a single-gap structure with properly configured reflecting films can achieve both alignment quality and optical performance, eliminating the need for gap variation that causes alignment defects
4Ease of operation
If all liquid crystal molecules are moved in thickness direction by applying voltage, then display operation is achieved, but response speed increases slowly
Solution Approach 1:
The patent implements local quality by applying voltage selectively to different regions (reflecting and transmitting) with different timing and characteristics. This localized control allows optimized response in each region, improving overall response speed while maintaining proper display operation through region-specific voltage application strategies
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 enhances contrast and resolution by preventing alignment defects and reducing manufacturing complexity, while also improving response speed and enabling high-definition transreflective panels beyond 300 ppi, without the need for additional light shielding or complex gap adjustments.
Implementation Method 1
a liquid crystal layer sandwiched between the first substrate and the second substrate, containing P-type liquid crystal molecules, and configured to be perpendicularly aligned when no electric field is applied
Implementation Method 2
a reflecting film provided in the reflecting region to overlap a portion of the pixel electrode, and comprising a conductive material
Data Source
AI summary
A liquid crystal display device includes: a first substrate and a second substrate; a liquid crystal layer sandwiched between the first substrate and the second substrate, containing P-type liquid crystal molecules, and configured to be perpendicularly aligned when no electric field is applied; a pixel including a reflecting region and a transmitting region, cell gaps of the reflecting region and the transmitting region being the same; one pixel electrode formed into a line on the first electrode; a first common electrode provided on the first substrate to sandwich the pixel electrode; a second common electrode provided on the second substrate; and a reflecting film provided in the reflecting region to overlap a portion of the pixel electrode, and comprising a conductive material.