Optical Sensor Compensation in Display Panels for Reliable Sensing
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Solution Overview
Problem
Existing display devices face challenges in precisely detecting fingerprints and illuminance due to variations in current intensity through optical sensors, which affect the reliability of optical sensor systems.
Innovation Solution
Incorporating a compensating circuit that generates sensing correction data based on the size of light receiving elements in optical sensors, using a calculation unit to normalize current intensities across multiple sensors, and storing this data in a data storage unit to improve sensing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If optical sensors with different sizes of light receiving elements are used, then the display device can cover more sensing areas, but the current intensity through each optical sensor varies, reducing sensing reliability
Solution Approach 1:
The patent applies parameter changes by introducing a compensating circuit that adjusts the sensing signal based on the light receiving element size. The circuit calculates a compensation value from reference data corresponding to each optical sensor's characteristics and modifies the sensed signal accordingly, thereby normalizing the output across sensors of different sizes and improving sensing reliability.
Solution Approach 2:
The compensating circuit acts as an intermediary between the optical sensors and the sensing circuit. It receives the raw sensing signals, applies size-based compensation using stored reference data, and outputs corrected sensing values. This intermediary component enables different sized sensors to work together reliably by mediating their varying current intensities.
2Reliability
If a compensating circuit is added to normalize current intensities, then sensing reliability improves, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-storing reference data in the compensating circuit before actual sensing operations. This reference data corresponds to the characteristics of each optical sensor and is used during normal operation to calculate compensation values. By preparing the compensation parameters in advance, the circuit avoids complex real-time calculations and reduces operational complexity.
Solution Approach 2:
The compensating circuit is designed to automatically adjust sensing signals based on the inherent characteristics of each optical sensor. It uses the sensor's own current intensity information and stored reference data to self-correct without requiring external intervention or complex manual calibration, thereby simplifying the overall system configuration.
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
Enhances the reliability of optical sensor systems in display devices by compensating for variations in current intensity, leading to improved fingerprint detection and illuminance sensing.
Implementation Method 1
an optical sensor PHK including a light receiving element LRD... an intensity of current flowing through each of the optical sensors due to light incident on the display panel
Data Source
AI summary
A display device includes: a display panel including pixels each including a light emitting element and optical sensors each including a light receiving element; a sensing circuit configured to sense the optical sensors; and a compensating circuit configured to store sensing correction data corresponding to a size of the light receiving element of each of the optical sensors, based on a result of sensing the optical sensors.