Active Optical Component Light Emission Control for Display Screens
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Solution Overview
Problem
Active optical components placed below a display screen, such as in bezel-less screen designs, can cause light spots due to emitted light affecting the display screen's pixels, leading to abnormal screen behavior and user experience issues.
Innovation Solution
An electronic device with a display screen, a display control circuit, and an optical control circuit, where the active optical component is controlled to start light emission after a predetermined delay, allowing the display screen time to recover before refreshing affected rows, thereby minimizing or eliminating light spots through synchronization signals and optimized working durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an active optical component is placed below a display screen to avoid opening a hole, then the screen-to-body ratio is improved, but light spots appear on the display screen affecting user experience
Solution Approach 1:
The display control circuit performs preliminary actions by pre-discharging capacitors and pre-refreshing pixel rows before the active optical component emits light. This preliminary action resets the electrical characteristics of pixels that will be affected by the emitted light, preventing light spot formation while maintaining the component placement below the screen.
Solution Approach 2:
The system applies preliminary anti-action by disrupting the normal display refresh sequence temporarily. The display control circuit sends disruption signals to pause pixel driving during the light emission period, and performs compensatory refresh operations after emission. This counteracts the harmful effect of light on pixel electrical characteristics, eliminating light spots while preserving the high screen-to-body ratio design.
2Reliability
If the display screen is refreshed continuously without interruption, then display quality is maintained, but the active optical component cannot emit light without causing light spots
Solution Approach 1:
The system implements periodic action by interrupting the continuous display refresh cycle at specific intervals. The display control circuit temporarily suspends pixel driving during the active optical component's light emission period, then performs compensatory refresh operations afterward. This periodic interruption strategy prevents light spot formation while maintaining overall display quality through structured refresh cycles.
Solution Approach 2:
Before the active optical component emits light, the display control circuit performs preliminary capacitor discharge and pixel row refresh operations. This preliminary action ensures that pixels are in a stable electrical state before being exposed to light, preventing the formation of light spots while allowing the display to maintain high quality through proactive electrical characteristic management.
3Reliability
If the active optical component emits light continuously, then sensing function is improved, but light spots persist on the display screen
Solution Approach 1:
The system applies periodic action by coordinating the active optical component's light emission with periodic interruptions in the display refresh cycle. The optical control circuit and display control circuit synchronize operations so that light emission occurs during designated intervals when pixel driving is temporarily suspended. This periodic coordination enables continuous sensing functionality while preventing light spot formation through structured timing control.
Solution Approach 2:
The system implements feedback by using synchronization signals exchanged between the optical control circuit and display control circuit. The display control circuit sends synchronization signals to coordinate light emission timing, and the optical control circuit adjusts emission based on display refresh status. This feedback mechanism ensures that light emission occurs only when it will not cause light spots, maintaining both sensing function and display quality.
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
The solution effectively reduces or eliminates light spots on the display screen, improving user experience by ensuring the display screen's electrical characteristics are restored before refresh, and the active optical component's operation is timed to avoid human perception of bright spots.
Implementation Method 1
The active optical component is configured to emit light when working
Implementation Method 2
the display screen is configured to allow light from the active optical component to pass through to surrounding objects
Data Source
AI summary
An electronic device includes a display screen, a display control circuit, an active optical component, and an optical control circuit. The active optical component is located below the display screen. The display control circuit is configured to control refreshing of the display screen, and output a synchronization signal to the optical control circuit. The optical control circuit is configured to receive the synchronization signal, and control the active optical component to start light emission after a predetermined first delay that is after a moment corresponding to the synchronization signal to enable the display control circuit to refresh to one row of at least one row on the display screen corresponding to the active optical component after a predetermined second delay that is after the active optical component completes light emission.