Integrated Display Sensing Circuit Reduces ADC Count and Bezel Size
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices require separate external compensation circuits and photo sensor detection circuits, leading to inefficiencies in resource utilization and increased bezel size due to the need for multiple ADCs and additional wiring, which hinders effective pixel compensation and input functionality.
Innovation Solution
An integrated circuit solution that combines the external compensation circuit and photo sensor detection circuit, reducing the number of ADCs and integrating sensing and output lines to enhance resource utilization and aperture ratio, allowing for cost reduction and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate external compensation circuit and photo sensor detection circuit are provided, then each circuit can operate independently, but the number of ADCs increases and bezel size increases
Solution Approach 1:
The patent merges the external compensation circuit and photo sensor detection circuit into a single integrated circuit. The sensing unit includes both the external compensation sensing circuit and photo sensor detection circuit, sharing common components such as the ADC, signal lines, and control logic. This integration reduces the number of ADCs from multiple to a single shared ADC, thereby reducing device complexity while maintaining independent operational capability through time-division multiplexing.
Solution Approach 2:
The integrated sensing unit is designed to perform multiple functions: external compensation sensing and photo sensor detection. The sensing unit can selectively operate in compensation mode or photo sensing mode based on control signals, allowing a single circuit to serve dual purposes. This multi-functionality eliminates the need for separate dedicated circuits for each function, reducing overall system complexity.
2Reliability
If separate external compensation circuit and photo sensor detection circuit are provided, then each circuit can be optimized independently, but the bezel size increases
Solution Approach 1:
The patent integrates both circuits into a single sensing unit located in the bezel region, combining their functional blocks and sharing common resources such as ADC, signal processing units, and control logic. This consolidation reduces the total area occupied in the bezel compared to having separate discrete circuits, while still allowing independent optimization of each functional block within the integrated structure.
3Manufacturing precision
If separate sensing line for external compensation and output line for photo sensor are provided, then each line can be optimized independently, but the aperture ratio of pixels decreases
Solution Approach 1:
The patent merges the sensing line for external compensation and the output line for photo sensor into a single shared signal line. The sensing unit uses time-division multiplexing to switch between reading compensation data and photo sensor output through the same line, eliminating the need for separate physical lines. This reduces the number of wiring lines passing through or near pixel regions, thereby increasing the aperture ratio while still allowing independent optimization of signal processing for each function.
4Reliability
If multiple ADCs are provided for external compensation and photo sensor detection, then each ADC can process signals independently, but resource utilization becomes inefficient
Solution Approach 1:
The patent implements a single ADC that serves dual functions: converting compensation sensing signals and photo sensor output signals. The ADC is controlled through time-division multiplexing, switching between processing compensation data and photo sensor data based on control signals. This universal ADC maintains independent processing capability for each signal type while significantly improving resource utilization efficiency by eliminating redundant ADC instances.
5Reliability
If additional wiring is provided for separate circuits, then each circuit can be connected independently, but the bezel size increases
Solution Approach 1:
The patent consolidates the wiring requirements by merging the connection lines for external compensation circuit and photo sensor detection circuit into a single integrated sensing unit. The integrated circuit uses shared signal lines and common connection points, reducing the total amount of wiring needed in the bezel region while maintaining independent connection capability through selective signal routing and time-division multiplexing.
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 integration reduces the number of ADCs, minimizes bezel size, increases pixel aperture ratio, enables efficient pixel compensation, and allows for touch or pointer input without additional hardware, improving overall display performance.
Implementation Method 1
The photo sensor is a device that stores the charge amount corresponding to a light intensity as information
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The display device according to the present disclosure may comprise a display panel equipped with a plurality of pixels and a plurality of photo sensors, a data driving circuit, a gate driving circuit, and a timing controller. The source drive IC included in the data driving circuit may comprise a DAC, one or more sensing units to receive an electrical signal from the photo sensor in a display period and to receive a sensing signal from the pixel in a blank period, and an ADC to convert the signal output from the sensing unit into digital data.