Display Module Voltage Detection Circuit for Brightness Compensation
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Solution Overview
Problem
Existing display technologies face challenges in achieving both excellent full-picture and local-picture display effects due to voltage drops caused by resistances in the power bus and power line connections, which affect brightness and contrast.
Innovation Solution
A display module with a voltage detection circuit that includes detection terminals connected to both the power line and power bus, allowing the driver chip to compensate for voltage drops across specific resistances, enabling independent control for full-picture and local-picture display modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If voltage compensation is performed for both power bus and power line to improve full-picture display, then full-picture display effect is improved, but device complexity increases
Solution Approach 1:
The voltage detection circuit is segmented into two independent detection paths: one for detecting power bus voltage and another for detecting power line voltage. This segmentation allows selective activation of detection functions based on display mode, reducing the need for a complex all-encompassing detection system while still enabling full-picture display compensation when needed.
Solution Approach 2:
The voltage detection circuit dynamically switches between different detection modes based on display requirements. The first detection terminal detects power bus voltage during full-picture display modes, while the second detection terminal detects power line voltage during local-picture display modes. This dynamic adaptation optimizes the detection system's complexity by activating only the necessary detection path for each operating condition.
2Illumination intensity
If voltage compensation is performed for power line to improve local-picture display, then peak brightness is enhanced, but voltage drop compensation accuracy decreases
Solution Approach 1:
The detection system applies local quality by using different detection strategies for different locations in the power distribution network. The first detection terminal monitors voltage at the power bus level (upstream), while the second detection terminal monitors voltage at the power line level (downstream, closer to sub-pixels). This location-specific detection ensures that the most relevant voltage information is captured for each display mode, balancing brightness enhancement with compensation accuracy.
Solution Approach 2:
The voltage detection circuit acts as an intermediary between the power distribution system and the driver chip. By detecting voltage at different points (power bus vs. power line) and providing appropriate compensation signals, the detection circuit mediates the trade-off between enhancing peak brightness and maintaining compensation accuracy, allowing the system to optimize performance based on specific display requirements.
3Adaptability or versatility
If dual detection terminals are used for selective voltage compensation, then adaptability is improved, but device complexity increases
Solution Approach 1:
The voltage detection circuit achieves universality by designing a single detection circuit structure that can perform multiple detection functions through selective terminal activation. The same circuit can detect power bus voltage for full-picture display compensation or power line voltage for local-picture display compensation, eliminating the need for separate detection circuits for each function and reducing overall device complexity while maintaining high adaptability.
Data Source
AI summary
Provided are a display module, a display device and a driving method of the display module. The display module includes: a display panel, where the display panel includes a display area and a non-display area, a substrate, and a plurality of sub-pixels and a power line disposed on the substrate; a flexible circuit board, where the flexible circuit board is bound to the substrate in the non-display area and includes a power bus electrically connected to the power line; a driver chip including at least one detection pin and at least one control pin; and a voltage detection circuit including a first detection terminal, a second detection terminal, an output terminal and a control terminal.