Transflective LCD Aperture Ratio via Fringe Field
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Solution Overview
Problem
Conventional transflective liquid-crystal displays face increased costs and reduced aperture ratio due to the cell gap modification layer, which also causes light leakage and affects liquid-crystal molecule arrangement, while maintaining illumination uniformity is challenging.
Innovation Solution
The design eliminates the cell gap modification layer by using a fringe electric field to arrange liquid-crystal molecules, allowing for increased pixel area and preventing light leakage, thus enhancing the aperture ratio and illumination uniformity without the need for a shielding layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a cell gap modification layer is disposed on the transparent electrode in the reflective area to adjust the cell gap, then the illumination uniformity is maintained, but the manufacturing cost increases and the aperture ratio decreases
Solution Approach 1:
The invention extracts and removes the cell gap modification layer from the display structure. By eliminating this additional layer, the patent reduces manufacturing complexity and cost while maintaining the essential functionality of the display through alternative means of controlling liquid crystal orientation.
Solution Approach 2:
The patent employs self-service by utilizing the fringe electric field generated by the pixel electrode itself to arrange liquid crystal molecules at the boundary between reflective and transmissive areas. This eliminates the need for external cell gap modification layers, as the electrode's own electric field performs the alignment function.
2Manufacturing precision
If a cell gap modification layer is disposed on the transparent electrode in the reflective area, then the cell gap is adjusted, but light leakage occurs at the edge of the modification layer
Solution Approach 1:
The pixel electrode's fringe electric field serves dual purposes: it drives the liquid crystal switching function and simultaneously arranges liquid crystal molecules at the area boundaries. This self-service approach eliminates the cell gap modification layer that causes light leakage, as the electric field naturally provides the necessary molecular alignment without creating edge discontinuities.
Solution Approach 2:
The patent changes the approach from physical structure modification (adding a cell gap modification layer) to electric field control (utilizing fringe electric field). By changing the control parameter from mechanical cell gap adjustment to electric field-based molecular arrangement, light leakage is prevented while maintaining precise cell gap control.
3Object-generated harmful factors
If a shielding layer is formed between the reflective area and the transmissive area to prevent light leakage, then light leakage is prevented, but the aperture ratio decreases
Solution Approach 1:
The pixel electrode's fringe electric field performs the shielding function by naturally arranging liquid crystal molecules at the boundary between reflective and transmissive areas. This eliminates the need for separate shielding layers, as the electric field itself provides the light leakage prevention mechanism while maintaining high aperture ratio.
Solution Approach 2:
The invention extracts and removes the shielding layer from the display structure. By eliminating this additional component, the patent increases the aperture ratio while maintaining light leakage prevention through the fringe electric field mechanism that naturally controls liquid crystal orientation at area boundaries.
4Illumination intensity
If the cell gap of the reflective area is made different from the cell gap of the transmissive area to maintain illumination uniformity, then the illumination uniformity is maintained, but additional manufacturing steps are required
Solution Approach 1:
The pixel electrode serves multiple functions: it drives liquid crystal switching in both reflective and transmissive areas and simultaneously arranges liquid crystal molecules at the boundary regions through its fringe electric field. This multi-functionality eliminates the need for separate cell gap modification layers, simplifying the manufacturing process while maintaining illumination uniformity.
Solution Approach 2:
The patent merges the functions of the pixel electrode with the liquid crystal alignment function at area boundaries. By combining these functions into a single component (the pixel electrode), the invention eliminates the need for separate cell gap modification layers, reducing manufacturing complexity while maintaining display performance.
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 approach increases the aperture ratio and doubles the illumination of the transmissive area while maintaining uniformity, even with similar cell gaps in reflective and transmissive areas, without the costs and light leakage issues of conventional designs.
Implementation Method 1
a plurality of liquid-crystal molecules of the liquid-crystal layer in the first and second sub-regions is arranged by a fringe electric field of the pixel electrode
Implementation Method 2
a liquid-crystal layer, a first substrate and a second substrate. The liquid-crystal layer is sandwiched between the first and second substrates
Data Source
AI summary
A transflective liquid-crystal display is provided, including a liquid-crystal layer, a first substrate and a second substrate. The liquid-crystal layer is sandwiched between the first and second substrates to define an array of pixels on the second substrate. Each pixel includes a reflective area, a transmissive area and a pixel electrode. The transmissive area is adjacent to the reflective area. The pixel electrode is disposed on the second substrate and electrical connecting to a data line, wherein the pixel electrode is only formed reflective electrode in the reflective area and has reflectivity.