Display Device Third Electrode Layer Storage Capacitance
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Solution Overview
Problem
Display devices face challenges in maintaining voltage holding ratio (VHR) when switching from high-frequency to low-frequency driving, requiring different pixel electrode designs that compromise aperture ratio and storage capacitance.
Innovation Solution
A display device structure with a first and second substrate forming a cell, where a third electrode layer is added on the first substrate, electrically connected to the second electrode layer through an insulation layer, forming additional capacitors to increase storage capacitance suitable for low-frequency driving while maintaining charge rate and aperture ratio during high-frequency driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel electrodes are designed small during high-frequency driving to reduce storage capacitance, then charge rate meets design requirement, but aperture ratio is reduced
Solution Approach 1:
The patent introduces a third electrode layer arranged in a different spatial dimension (on the same substrate as the first electrode layer but spaced apart by an insulation layer), transforming the capacitance enhancement from a two-dimensional pixel electrode area expansion to a three-dimensional multi-layer structure, thereby maintaining aperture ratio while increasing storage capacitance
Solution Approach 2:
The storage capacitance function is segmented into two independent capacitors: a first capacitor formed between the first and second electrode layers, and a second capacitor formed between the first and third electrode layers. This segmentation allows the pixel electrodes to remain small for high-frequency driving while the additional third electrode layer provides extra capacitance through a different spatial path
2Reliability
If pixel electrodes are designed large during low-frequency driving to ensure higher storage capacitance, then voltage holding ratio is maintained, but charge rate is compromised
Solution Approach 1:
The patent uses a third electrode layer arranged on the same substrate as the first electrode layer but spaced apart by an insulation layer, creating an additional capacitor that increases storage capacitance without expanding pixel electrode area, thereby maintaining both voltage holding ratio and charge rate performance
Solution Approach 2:
The patent combines multiple capacitor structures (first capacitor between first and second electrode layers, and second capacitor between first and third electrode layers) into a unified pixel structure, where the total storage capacitance is the sum of both capacitors, achieving high voltage holding ratio without compromising charge rate
3Reliability
If storage capacitance is increased for low-frequency driving, then voltage holding ratio is maintained, but device complexity increases
Solution Approach 1:
The third electrode layer serves multiple functions: it forms a second capacitor with the first electrode layer to increase storage capacitance for low-frequency driving, and can be electrically connected or disconnected from the second electrode layer via a switch to adapt to different driving frequencies, making the structure universally applicable to both high-frequency and low-frequency driving modes
Solution Approach 2:
The patent introduces a switch that can dynamically connect or disconnect the third electrode layer from the second electrode layer based on driving frequency requirements. During high-frequency driving, the switch disconnects the third electrode layer to reduce storage capacitance and improve charge rate. During low-frequency driving, the switch connects the third electrode layer to increase storage capacitance and maintain voltage holding ratio
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 solution enables high storage capacitance for low-frequency driving without reducing the aperture ratio during high-frequency driving, ensuring efficient charge rate and transmittance.
Implementation Method 1
a first capacitor C1st is formed between the second electrode layer on the second substrate and the first electrode layer
Implementation Method 2
a second capacitor C2st is formed between the first electrode layer and the third electrode layer
Implementation Method 3
an insulation layer is arranged between the third electrode layer and the first electrode layer
Data Source
AI summary
The embodiment of the present invention discloses a display device, which relates to the field of display, may realize low-frequency (low-standing-wave) driving and may prevent the aperture ratio from being reduced as a result of ensuring the charge rate during high-frequency driving. The display device provided by the present invention comprises a first substrate and a second substrate which are assembled with each other to form a cell, wherein the first substrate comprises a first electrode layer, the second substrate comprises a second electrode layer, the first substrate further comprises a third electrode layer arranged on one side, far from the second substrate, of the first electrode layer, and an insulation layer is arranged between the third electrode layer; and the first electrode layer, and the third electrode layer is electrically connected with the second electrode layer. The display device is suitable for being driven at low frequency.