Display Device Subpixel Sensing Through Low-Potential Voltage Lines
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Solution Overview
Problem
Existing display devices face limitations in improving display quality and lifespan due to the inability to accurately sense and compensate for changes in subpixel characteristics, leading to potential deterioration and reduced reliability.
Innovation Solution
Incorporating a circuit that senses subpixel characteristics through low-potential voltage lines, using switches to connect or disconnect these lines during display and sensing periods, and applying a higher reference voltage during sensing to enhance accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a circuit is added to sense subpixel characteristics through low-potential voltage lines, then sensing accuracy and reliability are improved, but device complexity increases
Solution Approach 1:
The low-potential voltage lines that originally served only as power supply lines are now used dual-purpose: during display periods they supply power to subpixels, and during sensing periods they serve as sensing lines to detect subpixel characteristics. This multi-functionality eliminates the need for separate sensing lines, thereby improving sensing accuracy without proportionally increasing device complexity
Solution Approach 2:
The patent employs switches to dynamically reconfigure the function of low-potential voltage lines between display and sensing modes. During display periods, the switches connect the low-potential voltage lines to power supply; during sensing periods, the switches disconnect them from power supply and connect them to sensing circuits. This dynamic switching enables the same physical lines to serve different functions at different times, resolving the contradiction between sensing capability and device complexity
2Reliability
If switches are used to connect or disconnect low-potential voltage lines during display and sensing periods, then sensing reliability is improved, but device complexity increases
Solution Approach 1:
Switches are strategically positioned at intersections of data lines and low-potential voltage lines to dynamically control electrical connectivity. During display periods, switches close to establish power supply paths; during sensing periods, switches open to isolate power supply and enable sensing. This dynamic reconfiguration ensures reliable sensing operation while maintaining a manageable circuit structure through selective switching rather than complete circuit redesign
Solution Approach 2:
The switches act as intermediary elements that mediate between the power supply function and the sensing function of the low-potential voltage lines. By placing switches at critical junctions, the patent enables clean separation of power supply and sensing operations without requiring completely separate circuits. The switches serve as controllable intermediaries that allow the same physical infrastructure to support both functions with high reliability
3Measurement precision
If a reference voltage higher than low-potential voltage is applied during sensing, then sensing accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent applies high reference voltage only during specific sensing periods rather than continuously. The sensing operation is periodically interleaved with display operations, where the high reference voltage is applied only when sensing is required. This periodic application of elevated voltage enables accurate sensing measurements while minimizing overall energy consumption compared to continuous high-voltage operation
Solution Approach 2:
The patent dynamically changes the voltage parameter of the low-potential voltage lines based on operational mode. During display periods, the lines operate at normal low potential; during sensing periods, the reference voltage is temporarily elevated. This parameter change enables the sensing circuit to operate at optimized voltage levels for high accuracy without permanently increasing energy consumption, as the high voltage state is transient and controlled
Data Source
AI summary
A display device includes a display panel including a plurality of subpixels connected to a high-potential voltage line and a plurality of low-potential voltage lines, respectively, a driver configured to drive the display panel, and a circuit configured to sense and compensate for a characteristic of a subpixel, among the plurality of pixels, through at least one of the plurality of low-potential voltage lines.