Oxide Semiconductor Transistor Display Power Reduction
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Solution Overview
Problem
Conventional electronic devices with touch-input functions face challenges in reducing power consumption, especially when displaying still images, and struggle with efficient use of light-receiving and reflective electrode areas in pixel structures, leading to increased power usage and limited battery life in portable devices.
Innovation Solution
The use of a transistor with an oxide semiconductor layer as a switching transistor, combined with a specific pixel structure that includes a photodiode and strategically positioned transistors and reflective electrodes, allows for reduced off-current and extended signal retention, enabling a non-operation state for display elements during still image display and efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional transistors are used in display devices, then the device can operate normally, but power consumption increases due to larger off-current
Solution Approach 1:
The patent changes the material parameter of the transistor from conventional semiconductor to oxide semiconductor, which fundamentally alters the electrical characteristics to achieve extremely low off-current while maintaining signal retention capability
Solution Approach 2:
The patent employs a composite structure combining oxide semiconductor layer with conventional transistor architecture, integrating the low off-current property of oxide semiconductors into the existing display device framework
2Reliability
If the display element control circuit operates continuously to maintain image quality, then display performance is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic operation of the display element control circuit, activating it only during necessary periods (image update, touch input detection) and placing it in non-operation state during still image display, thereby reducing power consumption while maintaining display quality
Solution Approach 2:
The oxide semiconductor transistor's inherent low off-current property allows the circuit to maintain image signals without continuous active control, enabling the system to 'serve itself' during still image display and achieve power savings
3Measurement precision
If photo sensors and reflective electrodes occupy larger area, then touch input precision and display quality improve, but the pixel structure becomes more complex
Solution Approach 1:
The patent resolves spatial conflicts by arranging photo sensors, reflective electrodes, and transistors in multiple layers and dimensions, allowing overlapping configurations that increase functional area without proportionally increasing planar footprint or structural complexity
Solution Approach 2:
The patent employs nested arrangement where components are positioned within or overlapping each other's spatial boundaries across different layers, maximizing the use of available pixel area for multiple functions simultaneously
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 significantly reduces power consumption by minimizing off-current and allowing for longer retention of image signals, enabling a portable electronic device to display both still and moving images on a single screen while maintaining low power usage, even in bright environments without a backlight.
Implementation Method 1
The photo sensors detect external light entering the display portion and a shadow which is made on part of the display portion
Data Source
AI summary
One object is to provide a new electronic device which is configured so that a user can read data regardless of a location, input data by directly touching a keyboard displayed on a screen or indirectly touching the keyboard with a stylus pen or the like, and use the input data. A first transistor electrically connected to a reflective electrode and a photo sensor are included over one substrate. A touch-input button displayed on a first screen region of the display portion is displayed as a still image, and a video signal is output so that a moving image is displayed on a second screen region of the display portion. A video signal processing portion supplying different signals between the case where a still image is displayed on the display portion and the case where a moving image is displayed on the display portion is included.