Reflective LCD Pixel Circuit with Integrated Memory and Photosensor
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Solution Overview
Problem
Existing display apparatuses face challenges in reducing power consumption while maintaining high image quality and ease of manufacturing, particularly in small-sized liquid crystal display devices that require efficient input information detection and processing.
Innovation Solution
A reflective liquid crystal display apparatus with a pixel electrode and memory elements that utilize a photosensor circuit to detect input information and switch voltage levels for display signals, allowing for reduced power consumption and enhanced processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a memory element is added to hold write voltage state for reducing power consumption, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent combines the memory element with the pixel circuit structure by integrating it into the existing transistor arrangement. The memory element is formed using the same thin-film transistor technology and is embedded within the pixel circuit, sharing common elements such as gate electrodes and insulating layers, thereby reducing overall device complexity while achieving power consumption reduction.
Solution Approach 2:
The memory element serves multiple functions: it holds the write voltage state for power consumption reduction, maintains display data during refresh cycles, and enables the display to operate in both reflective and transmissive modes. This multi-functionality reduces the need for separate dedicated circuits, thereby managing complexity while achieving energy efficiency.
2Speed
If photosensor circuit is added to detect input information, then processing speed is improved, but device complexity increases
Solution Approach 1:
The photosensor circuit acts as an intermediary between the external input (light signals) and the pixel circuit processing. It converts optical input into electrical signals that can be processed by the existing pixel circuit logic, enabling fast input detection without requiring complete redesign of the pixel circuit architecture.
Solution Approach 2:
The photosensor circuit is integrated directly into the pixel structure, allowing each pixel to independently detect and process input information locally. This self-service capability eliminates the need for complex centralized processing circuits, as each pixel handles its own input detection and processing, thereby improving speed while managing complexity.
3Ease of manufacture
If pixel circuit complexity is reduced for ease of manufacture, then ease of manufacture is improved, but image quality may deteriorate
Solution Approach 1:
The patent optimizes the parameters of the thin-film transistors and insulating layers to achieve high-quality display performance with simplified circuit structures. By carefully controlling film thickness, material composition, and transistor dimensions, the patent maintains high image quality (contrast ratio, response time) while using fewer circuit elements, thereby easing manufacturing.
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 lower power consumption and faster processing of input information, supporting high-definition displays with reduced pixel circuit complexity and improved user experience.
Implementation Method 1
a sensor circuit which detects input information and provides data for a detection signal to the memory
Data Source
AI summary
According to one embodiment, a display apparatus includes signal lines, and pixels. Each of the pixels includes a pixel electrode and a pixel control switch, and being classified into any of pixel groups. Each of the pixel groups includes a memory, and a sensor circuit which is configured to provide data for a detection signal to the memory when detecting the input information. The pixel control switch is configured to switch the voltage level of the pixel electrode in accordance with data for the display signal input via the signal line and the data for the detection signal input from the memory.