Light-Sensitive Display Using Bi-Stable Transistors for Low Power Writing
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Solution Overview
Problem
Traditional touch panels used in display apparatuses with writing functions, such as electronic blackboards and electronic paper, face issues with contrast ratio, energy consumption, and interference, particularly when used for extended periods, and require complex configurations for touch point detection.
Innovation Solution
A light-sensitive display apparatus utilizing a bi-stable metal oxide transistor and electrophoretic display panel that changes its conduction state upon illumination, allowing for writing and erasing with light rays, reducing the need for touch point detection and minimizing energy consumption by maintaining a permanent display state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is used for touch point detection, then sensing capability is provided, but positioning precision deteriorates and interference increases
Solution Approach 1:
The patent replaces the mechanical touch panel sensing system with a light-based sensing system. Light-sensitive transistors detect light rays directly to control pixel states, eliminating the need for mechanical touch point detection. This substitution resolves the positioning precision and interference issues while maintaining sensing capability through optical detection.
2Adaptability or versatility
If a touch panel is used for display, then sensing and display functions are integrated, but contrast ratio deteriorates and energy consumption increases
Solution Approach 1:
The patent employs electrophoretic display technology where charged particles undergo phase transitions between different states (e.g., aggregated vs. dispersed states) to achieve display functions. The bi-stable metal oxide transistor controls these phase transitions, allowing permanent image retention without continuous power consumption, thus reducing energy loss while maintaining integrated sensing and display capabilities.
Solution Approach 2:
The system uses periodic light ray illumination to switch between writing and erasing states. By applying light periodically, the display updates only when needed, rather than requiring continuous power supply for maintenance, thereby reducing overall energy consumption while preserving the integrated function.
3Duration of action of stationary object
If a touch panel displays for a long time, then continuous display function is provided, but energy consumption increases and image retention deteriorates
Solution Approach 1:
The electrophoretic display panel utilizes phase transitions of charged particles to achieve permanent image retention. Once particles transition to their target state (e.g., aggregated for dark pixels or dispersed for light pixels), they remain in that state without requiring continuous power, enabling long-duration display with minimal energy consumption.
Solution Approach 2:
The display system performs self-service by maintaining its display state through the inherent stability of the electrophoretic particles. The bi-stable transistor holds the pixel state without external intervention, allowing the display to maintain images indefinitely without continuous power supply or active maintenance.
4Ease of operation
If a bi-stable metal oxide transistor is used with light ray illumination, then writing and erasing functions are achieved, but complex voltage control is required
Solution Approach 1:
The patent introduces light rays as an intermediary between the user input and the transistor state change. Instead of directly applying complex voltage patterns, users simply illuminate specific pixels with light rays, and the bi-stable metal oxide transistor automatically transitions between states based on the illumination, simplifying the user operation while the underlying voltage control remains managed by the transistor's inherent bi-stable characteristics.
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 light-sensitive display apparatus achieves low power consumption and permanent image retention while avoiding the interference and positioning issues of traditional touch panels, enabling direct light-based writing and erasing without complex touch detection configurations.
Implementation Method 1
The conduction state of the bi-stable metal oxide transistor is changed by being illuminated by light rays
Implementation Method 2
utilizing a bi-stable metal oxide transistor and electrophoretic display panel
Data Source
AI summary
A light sensitive display apparatus and an operating method thereof are disclosed herein. The light sensitive display apparatus includes a plurality of pixels, and the operating method of the light sensitive display apparatus includes the following steps. In a writing state, a first data voltage and a first gate voltage are provided to the pixels, and the pixels illuminated by light rays are switched to or kept in a first display state. In an erasing state, a second data voltage and a second gate voltage are provided to the pixels, and the pixels illuminated by light rays are switched to or kept in a second display state.