Dynamic Refresh Signal Synchronization for Under-Screen Components
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Solution Overview
Problem
Existing technologies fail to effectively prevent interference between display pixels and under-screen electronic components, particularly when the screen refresh rate changes, leading to issues like image distortion and bright spots, and require additional pins increasing system cost.
Innovation Solution
An electronic device with a display unit and an under-screen electronic component that receives a dynamic refresh signal with initial and delayed pulses, allowing coordinated operation to prevent interference by synchronizing the electronic component's operation with the display driver circuit, reducing design complexity and control latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the screen refresh rate is dynamically adjusted to reduce power consumption, then power consumption is reduced, but the interference prevention between display pixels and under-screen electronic components becomes difficult to maintain
Solution Approach 1:
The patent merges the refresh rate information with the existing dynamic refresh signal that controls display pixels. By integrating the refresh rate indication directly into the signal that already controls pixel illumination, the system eliminates the need for separate communication channels while maintaining coordinated control of both display pixels and under-screen electronic components across varying refresh rates
Solution Approach 2:
The dynamic refresh signal serves multiple functions: it controls the illumination timing of display pixels and simultaneously conveys refresh rate information to under-screen electronic components. This multi-functional signal eliminates the need for additional dedicated pins or communication protocols, achieving both power savings through variable refresh rates and reliable interference prevention
2Reliability
If an additional pin is added to provide refresh rate information to under-screen electronic components, then interference prevention reliability is improved, but system cost increases significantly
Solution Approach 1:
The patent combines multiple functions into the existing dynamic refresh signal: pixel control and refresh rate information transmission. This eliminates the need for additional pins while ensuring under-screen components receive accurate timing information for coordinated operation
Solution Approach 2:
The display driver circuit uses its existing signal infrastructure to serve dual purposes: controlling pixel illumination and communicating refresh rate information to under-screen components. The system leverages its own internal signals rather than requiring external additional communication channels
3Object-generated harmful factors
If existing technology solutions control electronic components to be inactive during display pixels illumination, then interference is reduced, but the solution fails when refresh rate varies dynamically
Solution Approach 1:
The patent implements a feedback mechanism where the display driver circuit continuously provides refresh rate information to under-screen electronic components through the dynamic refresh signal. This enables the electronic components to automatically adjust their operation timing based on the current refresh rate, maintaining effective interference prevention across dynamic refresh rate changes
Solution Approach 2:
The system dynamically adapts the operation timing of under-screen electronic components based on the current refresh rate. Rather than using fixed inactive periods, the components receive real-time timing information through the refresh signal, allowing them to synchronize their operation with the dynamically adjusting display refresh rate
Data Source
AI summary
The present application provides an electronic device, which includes a display unit, a display driving circuit, and an electronic component. The display driving circuit is coupled to the display unit, and the display driving circuit is capable of driving the display unit to display images with a plurality of refresh rate modes including a first refresh rate and a second refresh rate. The electronic component is disposed under a display area of the display unit, is coupled to the display driving circuit, and receives a dynamic refresh signal generated by the display driving circuit, wherein the dynamic refresh signal includes a plurality of initial pulses and a plurality of delay pulses. Thus, the present application overcomes the problem that mutual interference between display pixels and under-screen electronic component cannot be effectively avoided in existing technology when the display unit changes screen refresh rates.