OLED Touch Display Infrared Layer Dim Environment Detection
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Solution Overview
Problem
Optical reflective type OLED touch panels face challenges in accurate signal recognition under dim environments due to weak backlight light and difficulty in sensing touch points at lower gray levels, such as black, leading to incomplete touch detection.
Innovation Solution
Integration of an infrared emitting layer and an infrared sensing unit within the OLED display, allowing detection of infrared rays to determine touch positions, which operates independently of ambient light conditions and maintains power efficiency by only generating infrared rays in dim environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical reflective type touch panel uses backlight reflection to detect touch points, then it can operate in dim environments, but the reflected light signal is weak and touch detection accuracy deteriorates
Solution Approach 1:
The patent changes the wavelength parameter of light from visible light to infrared light. The infrared emitting layer emits infrared light at a wavelength range that human eyes cannot perceive, while the infrared sensing units detect infrared reflections. This parameter change allows the system to operate in dim environments without compromising touch detection accuracy, as infrared detection is independent of ambient visible light conditions.
Solution Approach 2:
The patent introduces an infrared emitting layer as an intermediary component that generates infrared light, and infrared sensing units as intermediary detectors. These intermediaries enable touch detection through infrared reflection rather than relying on visible backlight reflection, solving the problem of weak signal strength in dim environments.
2Measurement precision
If infrared emitting layer is always activated to ensure accurate touch detection in dim environments, then touch sensitivity improves, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of the infrared emitting layer based on ambient light detection. The system includes ambient light sensing units that continuously monitor environmental brightness and dynamically adjust the activation state of the infrared emitting layer. In bright environments, the infrared layer remains inactive to save power; in dim environments, it activates to ensure accurate touch detection. This dynamic adaptation resolves the contradiction between maintaining detection accuracy and reducing power consumption.
Solution Approach 2:
The system employs feedback control through ambient light sensing units that provide real-time information about environmental brightness to the control logic. Based on this feedback, the system automatically adjusts the infrared emitting layer's activation state, ensuring optimal power consumption while maintaining touch detection accuracy across different lighting conditions.
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
Enables accurate touch position detection even in dim environments and at low gray levels without affecting the original pixel contrast, reducing power consumption and improving touch sensitivity.
Implementation Method 1
an infrared emitting layer and an infrared sensing unit, and an organic light emitting diode are integrated
Implementation Method 2
an infrared emitting layer and an infrared sensing unit, and an organic light emitting diode are integrated
Implementation Method 3
an organic light emitting diode for generating light based on the driving current
Data Source
AI summary
An OLED display is proposed. The OLED display includes a gate driver for generating a scanning signal, a source driver for generating a data signal, and a plurality of cells arranged in an array. Each cell includes a first transistor for delivering the data signal when receiving the scanning signal, a second transistor for generating a driving current based on a voltage difference between a first supply voltage signal and the data signal, a storage capacitor coupled between the first transistor and an output end of the driving circuit, for storing the data signal, an organic light emitting diode for generating light based on the driving current, an infrared emitting layer for producing infrared ray, and an infrared sensitive layer for sensing the infrared ray reflected by an object.