Transflective LCD Single Cell Gap Pixel Electrode Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transflective LCD devices with dual cell gaps face manufacturing complexities and defects due to the need for an overcoat layer, which complicates the alignment process and increases costs, while also limiting the operating time of the backlight unit and making it difficult to recognize images in bright environments.
Innovation Solution
A transflective LCD device with a single cell gap structure, where the pixel electrode is extended to both the transmitting and reflective parts, allowing for controlled birefringence and optical phase retardation, eliminating the need for an overcoat layer and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dual cell gap structure with overcoat layer is used to provide different birefringence to reflective and transmitting parts, then the optical properties can be differentiated, but the manufacturing complexity and defects increase
Solution Approach 1:
The pixel electrode is segmented into multiple regions with different transparency characteristics. The reflective part contains a first region (non-transparent) and a second region (transparent), while the transmitting part is fully transparent. This segmentation allows different optical paths without requiring dual cell gaps or overcoat layers, simplifying the overall structure while maintaining optical differentiation.
Solution Approach 2:
Different regions within the pixel electrode are assigned different local qualities (transparency/reflectivity). The first region of the reflective part has non-transparent properties to reflect ambient light, while the second region and transmitting part have transparent properties to allow light transmission. This local differentiation achieves the required optical properties without complex structural modifications.
2Manufacturing precision
If a dual cell gap structure is used to control birefringence, then the reflective and transmitting parts have different optical properties, but the alignment process becomes more difficult
Solution Approach 1:
The pixel electrode is divided into regions with different transparency to achieve optical differentiation without creating physical cell gap variations. This segmentation approach maintains a uniform cell gap throughout the display, eliminating the alignment issues associated with dual cell gap structures while still providing the necessary birefringence control through regional optical property differences.
3Ease of manufacture
If the pixel electrode is extended to both transmitting and reflective parts with single cell gap, then manufacturing is simplified, but controlling different birefringence becomes challenging
Solution Approach 1:
Different regions of the pixel electrode are assigned different local optical qualities. The first region of the reflective part is designed with non-transparent properties to provide λ/4 phase retardation, while the second region and transmitting part have transparent properties for λ/2 phase retardation. This local quality differentiation enables precise birefringence control within a uniform single cell gap structure, maintaining both manufacturing simplicity and optical precision.
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 single cell gap structure ensures consistent optical properties between the transmitting and reflective parts, improving image visibility in bright environments and reducing power consumption by optimizing the use of ambient light, while minimizing manufacturing defects and costs.
Implementation Method 1
LCD devices operate by using optical anisotropy and polarization properties of a liquid crystal material
Implementation Method 2
The optical anisotropy of the liquid crystal material is changed and light propagating through the liquid crystal material is polarized
Implementation Method 3
a reflective sheet 11 formed on the passivation layer of reflective part so as to reflect the ambient light
Implementation Method 4
Liquid crystal molecules have long and thin shapes and tend to align in the same direction according to an electric field
Data Source
AI summary
A transflective liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer, and a pixel electrode. The first substrate has a thin film transistor and the second substrate has a color filter and faces the first substrate. The liquid crystal layer is disposed between the first and the second substrates. The pixel electrode is disposed above the first substrate and electrically connected to the thin film transistor. The transflective liquid crystal display device further includes a pixel region. The pixel region is divided into a transmit part and a reflective part, and the reflective part includes a first region and a second region. The pixel electrode extends to the transmit part and only the second region of the reflective part.