Display Panel Bio-Sensing With Variable Horizontal Frame Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic devices with integrated bio-sensing capabilities face challenges in maintaining a large display region without increasing the bezel size, as separate sensors reduce the available display area.
Innovation Solution
A display apparatus with a light sensing circuit that sets the horizontal period of normal frames and sensing frames differently, allowing for efficient integration of bio-sensing operations within the display panel without reducing the display region size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate sensor is used for bio-sensing operations, then the sensing function is achieved, but the display region size is reduced and the bezel size is increased
Solution Approach 1:
The patent merges the light sensing circuit with the display panel by integrating photo diodes and sensing circuits directly into the pixel structure. The light sensing circuit shares the same substrate and circuit architecture as the display pixels, allowing bio-sensing operations to be performed within the display region without requiring separate sensors, thereby maintaining the display region size while achieving reliable sensing functionality
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both a display device and a bio-sensing device. The pixel circuit is configured to perform both display operations and light sensing operations by switching between different modes, eliminating the need for separate dedicated sensors and preserving the display area
2Measurement precision
If the horizontal period of sensing frame is increased to improve sensing accuracy, then the sensing precision is improved, but the sensing time is increased
Solution Approach 1:
The sensing frame is divided into multiple scanning periods with different horizontal periods. The sensing processor scans the sensing signal in multiple stages, with each stage having optimized horizontal periods. This segmentation allows the system to achieve high sensing accuracy through multiple measurements while keeping the total sensing time manageable by distributing the measurement across different time intervals
Solution Approach 2:
The light emitting element emits light periodically at different intensities during the sensing frame, and the light sensing circuit measures the reflected light in multiple periodic cycles. By using periodic action with varying light intensities and multiple scanning periods, the system achieves high sensing precision through accumulated measurements while controlling the overall sensing time through efficient periodic operation
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 approach reduces sensing time by optimizing the horizontal periods of normal and sensing frames, enabling effective bio-sensing operations within the display apparatus without compromising the display area.
Implementation Method 1
a light emitting element and a light sensing circuit including a light sensing element... a sensed signal from the light sensing circuit
Implementation Method 2
a light sensing circuit including a light sensing element... receives a sensed signal from the light sensing circuit
Data Source
AI summary
A display apparatus includes a display panel, a gate driver, a data driver and a sensing processor. The display panel includes a pixel circuit including a light emitting element and a light sensing circuit including a light sensing element. The gate driver outputs a gate signal to the pixel circuit and the light sensing circuit. The data driver outputs a data voltage to the pixel circuit. The sensing processor receives a sensed signal from the light sensing circuit. A horizontal period of a normal frame, in which the sensed signal is not sensed from the light sensing circuit, is different from a horizontal period of a sensing frame in which the sensed signal is sensed from the light sensing circuit.