Display Device Electrode Overlap for Scanning Speed
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Solution Overview
Problem
Display devices driven by the field-sequential system face challenges in reducing scanning line selection time without degrading display quality, such as flicker occurrence, and improving image visibility.
Innovation Solution
The display device incorporates an array substrate with first and third light-transmitting electrodes, a counter substrate with a second light-transmitting electrode, and a liquid crystal layer with polymer-dispersed liquid crystals, where the third light-transmitting electrode overlaps the first electrode with an inorganic insulating layer, and a conductive metal layer is stacked on the third electrode, enabling efficient light emission and improved capacitance holding for reduced scanning line selection time and enhanced image visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the field-sequential system is used to drive the display device, then color display capability is achieved, but scanning line selection time increases causing flicker and reduced visibility
Solution Approach 1:
The holding capacitance electrode is positioned to overlap with the pixel electrode in advance, enabling the holding capacitance to be formed before the scanning line selection is complete. This preliminary configuration allows the pixel electrode potential to be maintained during the color light emission period without requiring extended scanning time, thus resolving the contradiction between field-sequential color display and scanning speed
Solution Approach 2:
The inorganic insulating layer is introduced as an intermediary between the pixel electrode and the holding capacitance electrode. This intermediary structure enables electrical isolation while maintaining the capacitance holding function, allowing the pixel electrode potential to be sustained during color emission without interfering with the scanning process, thereby reducing flicker and improving visibility
2Productivity
If scanning line selection time is reduced to improve productivity, then display response speed increases, but display quality degrades due to flicker occurrence
Solution Approach 1:
The holding capacitance structure is pre-configured with the electrode overlap arrangement before the scanning process begins. This preliminary setup ensures that when scanning lines are selected rapidly, the pixel electrode potential is already maintained by the holding capacitance, preventing flicker even at reduced scanning times and thus maintaining display quality while improving response speed
Solution Approach 2:
The holding capacitance electrode provides a feedback mechanism that continuously maintains the pixel electrode potential during the color light emission period. This feedback ensures that even when scanning lines are selected quickly, the display quality remains stable by compensating for any potential drops, thus preventing flicker while allowing faster scanning
3Loss of time
If third light-transmitting electrode and conductive metal layer are added to improve capacitance holding, then scanning line selection time is reduced, but device complexity increases
Solution Approach 1:
The third light-transmitting electrode serves multiple functions: it acts as part of the pixel electrode structure for light transmission, provides a base layer for the holding capacitance electrode, and works in conjunction with the conductive metal layer to maintain pixel electrode potential. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity while achieving improved capacitance holding and reduced scanning time
Solution Approach 2:
The inorganic insulating layer is merged with the electrode structure, serving both as an electrical insulator and as part of the capacitance holding system. The conductive metal layer is combined with the third light-transmitting electrode to form an integrated potential maintenance structure. This merging of functions achieves improved capacitance holding without proportionally increasing device complexity
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 configuration allows for reduced scanning line selection time while preventing flicker degradation and improving image visibility by effectively controlling the liquid crystal layer's scattering state and maintaining the potential of pixel electrodes during color light emission periods.
Implementation Method 1
a liquid crystal layer including polymer-dispersed liquid crystals filled between the array substrate and the counter substrate
Implementation Method 2
effectively controlling the liquid crystal layer's scattering state
Implementation Method 3
with an inorganic insulating layer interposed therebetween
Implementation Method 4
maintaining the potential of pixel electrodes during color light emission periods
Data Source
AI summary
A display device according to an aspect includes: an array substrate including a plurality of first light-transmitting electrodes each disposed in a corresponding one of pixels; a counter substrate including positions that overlap the first light-transmitting electrodes in a plan view and are provided with a second light-transmitting electrode; a liquid crystal layer including polymer-dispersed liquid crystals filled between the array substrate and the counter substrate; and at least one light emitter configured to emit light toward a side surface of the counter substrate. The array substrate includes, in each of the pixels, a third light-transmitting electrode and a conductive metal layer. The third light-transmitting electrode at least partially overlaps the first light-transmitting electrode in the plan view with an inorganic insulating layer interposed therebetween, and the conductive metal layer is stacked on the third light-transmitting electrode.