Reflective LCD Electrode Layout for Stable Storage Capacitance
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Solution Overview
Problem
In reflection type liquid crystal display components, the uneven surface of the reflection film leads to unstable storage capacitance due to varying distances between the common electrode and the reflection film, resulting in lowered display quality.
Innovation Solution
A display device configuration that includes a switching component, a first electrode connected to the switching component, a second electrode with a reflection layer having an uneven surface, a third electrode with a common potential, and specific insulating films to maintain a stable distance and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common electrode is disposed to overlap the reflection film via an insulation film to keep the potential of the reflection film, then the storage capacitance is created, but the distance between the common electrode and the reflection film varies due to the uneven surface of the reflection film, resulting in unstable storage capacitance
Solution Approach 1:
A planarization layer is introduced as an intermediary between the reflection film and the common electrode. This planarization layer has a flat upper surface that provides a uniform reference plane for the common electrode, ensuring constant distance and stable storage capacitance despite the uneven lower surface of the reflection film.
Solution Approach 2:
The solution addresses the surface unevenness problem by adding a new dimensional layer (the planarization layer) that compensates for the height variations of the reflection film. This creates a new reference plane that eliminates the distance variation issue between the common electrode and the reflection film.
2Device complexity
If the common electrode is disposed to overlap the reflection film having an uneven surface, then storage capacitance is created, but the varying distance between electrodes causes unstable capacitance and lowered display quality
Solution Approach 1:
The planarization layer serves as a mediator that maintains the storage capacitance function while ensuring display quality. It provides a flat interface for the common electrode, ensuring uniform electric field distribution and stable capacitance values across the display area.
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 configuration effectively suppresses the lowering of display quality by maintaining a stable storage capacitance and ensuring consistent distances between electrodes, thereby improving display performance.
Implementation Method 1
a second electrode including a reflection layer that reflects light
Data Source
AI summary
A display device includes a switching component, a first electrode connected to the switching component, a first line connected to the switching component and included in a lower layer than the first electrode, a second electrode included in an upper layer than the first line and including a reflection layer that reflects light and has an uneven surface, a third electrode included in a layer lower than the first electrode and upper than the first line and disposed to overlap at least the first electrode and the first line and having a common potential, a first insulating film disposed between the first electrode and the third electrode, and a second insulating film included in a layer upper than the first line and lower than the third electrode and having a thickness greater than a thickness of the first insulating film.