Transflective Display Substrate With Three-Plate Storage Capacitor
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Solution Overview
Problem
Existing transflective liquid crystal displays face challenges in maintaining high resolution and reducing flicker due to limited storage capacitor area and jump voltage differences, especially with increasing pixel size constraints.
Innovation Solution
The display substrate design includes a base substrate with sub-pixels featuring a transmissive and reflective section, incorporating a storage capacitor with multiple electrode plates and a switching transistor, where the electrode plates are spaced and insulated, and a transparent conductive layer with via holes for electrical connections, enhancing capacitance without increasing horizontal size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage capacitor area is increased to reduce jump voltage differences, then the capacitance increases, but the horizontal size of the sub-pixel increases
Solution Approach 1:
The patent transitions from a planar storage capacitor design to a three-dimensional structure by adding a third electrode plate above the second electrode plate. This vertical stacking arrangement increases the capacitance in the vertical dimension rather than expanding the horizontal footprint, thereby maintaining sub-pixel resolution while improving storage capacity.
Solution Approach 2:
The storage capacitor electrodes are nested in a layered configuration where the first electrode plate, second electrode plate, and third electrode plate are stacked vertically. The first and third electrode plates are electrically connected and positioned on opposite sides of the second electrode plate, creating a nested capacitive structure that maximizes capacitance within a compact vertical space.
2Measurement precision
If the pixel size is reduced to increase resolution, then the display resolution improves, but the storage capacitor area becomes insufficient
Solution Approach 1:
By utilizing the vertical dimension through the third electrode plate positioned above the second electrode plate, the patent achieves increased capacitance without consuming additional horizontal area. This dimensional transition allows high-resolution displays with smaller pixel sizes to maintain adequate storage capacitor capacity.
Solution Approach 2:
The patent combines multiple capacitive functions into a single integrated storage capacitor structure. The first electrode plate, second electrode plate, and third electrode plate work together as a unified capacitive system, merging the functions of multiple capacitors into one compact unit that fits within reduced pixel areas.
3Reliability
If the electrode plates are placed close together to increase capacitance, then the capacitance increases, but the insulation and spacing requirements become more difficult to meet
Solution Approach 1:
The storage capacitor is segmented into distinct electrode plates (first, second, and third electrode plates) separated by insulating layers. This segmentation allows each electrode to be precisely positioned and insulated from others, maintaining manufacturing precision while achieving the required capacitance through the distributed plate configuration.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between the electrode plates to maintain precise spacing and electrical insulation. These intermediary insulating structures enable close proximity of electrode plates for high capacitance while ensuring proper insulation, thus resolving the contradiction between capacitance and manufacturing 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
This design increases storage capacitor capacitance, reduces jump voltage differences, and maintains high resolution while ensuring a flat reflective surface for improved reflection efficiency.
Implementation Method 1
a storage capacitor and a switching transistor that are arranged in the reflective section; the storage capacitor includes: a first electrode plate, a second electrode plate and a third electrode plate
Implementation Method 2
a transparent conductive layer with via holes for electrical connections
Data Source
AI summary
The present disclosure provides a display substrate, including sub-pixels, and an nth sub-pixel includes: a transmissive section and a reflective section; and a storage capacitor and a switching transistor in the reflective section. The storage capacitor includes: first to third electrode plates, the first electrode plate is electrically connected to the third electrode plate, the second electrode plate is electrically connected to the switching transistor. An orthographic projection of the first electrode plate overlaps with an orthographic projection of the second electrode plate, and the orthographic projection of the second electrode plate overlaps with an orthographic projection of the third electrode plate. An orthographic projection of the active portion of the switching transistor is spaced apart from the orthographic projection of the third electrode plate, and the active portion has substantially a same thickness as the third electrode plate.