Display Panel Light-Receiving Elements Power Management
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Solution Overview
Problem
Existing displays that implement light emission and light reception in parallel face high power consumption due to the need for continuous backlight operation during both display and detection periods, especially in liquid crystal displays, which leads to inefficient energy usage.
Innovation Solution
A display configuration that includes light-receiving elements adjacent to display elements, with a controller switching between a low power consumption mode and a normal operation mode based on contact or proximity detection, allowing the backlight to be turned off or operated at reduced cycles when no contact is detected, thereby reducing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the backlight is continuously operated during both display and detection periods, then the detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent applies periodic action by operating the backlight only during display periods and turning it off during detection periods. The light-receiving elements detect touch information by sensing changes in ambient light or reflected light without requiring continuous backlight illumination, thereby reducing power consumption while maintaining detection accuracy through periodic light reception cycles.
Solution Approach 2:
The patent extracts the backlight function from the light reception process. Instead of using the backlight for both display and detection, the system separates these functions: the backlight is used only for display, while light-receiving elements utilize ambient light or reflected light for touch detection, eliminating the need for continuous backlight operation during detection.
2Use of energy by moving object
If the backlight is turned off during detection periods, then the power consumption is reduced, but the detection accuracy deteriorates
Solution Approach 1:
The patent introduces an intermediary approach by using light-receiving elements that can detect touch information through ambient light or reflected light from the display panel itself. The light-receiving elements act as intermediaries between the display panel and the touch detection system, enabling accurate touch detection without requiring continuous backlight illumination by capturing light that is already present in the system.
Solution Approach 2:
The system uses feedback by continuously monitoring light reception signals from the light-receiving elements and adjusting detection parameters based on ambient light conditions. This feedback mechanism allows the system to maintain detection accuracy across varying light conditions without requiring continuous backlight operation, as the system adapts to the available light environment.
3Measurement precision
If light-receiving elements are driven continuously for touch detection, then the touch detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic action by driving light-receiving elements only during detection periods rather than continuously. The system alternates between display periods and detection periods, with light-receiving elements activated only when touch detection is required, thereby significantly reducing power consumption while maintaining accurate touch detection through periodic sampling.
Solution Approach 2:
The system applies dynamics by making the operation of light-receiving elements variable and adaptive. The driving frequency and intensity of light-receiving elements are adjusted based on whether a touch event is detected, allowing the system to consume minimal power during normal operation while providing high detection accuracy when needed, creating a dynamic power management strategy.
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 backlight operation and extending detection cycles when no contact is present, optimizing energy efficiency in displays that concurrently perform image displaying and light reception.
Implementation Method 1
a plurality of light-receiving elements which are disposed adjacent to the plurality of display elements, respectively, and receive light incident on a display plane
Data Source
AI summary
The present invention is to reduce power consumption in a display that concurrently (or alternately) implements light emission and light reception in parallel. A display is provided with a display panel configuration including a plurality of display elements arranged in a matrix and a plurality of light-receiving elements that are disposed adjacent to the plurality of display elements and receive light incident on a display plane. In addition, the display includes a position detector that determines the position of contact or proximity to the display plane based on a light reception signal arising from light reception by the light-receiving elements. Furthermore, the display includes a controller that shifts the displaying state or the position detection state from the low power consumption mode to the normal operation mode if the position detector has determined the presence of contact or proximity in a predetermined state.