Proximity Sensor Synchronization with OLED Rewrite Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Proximity sensors in electronic devices, particularly those with OLED displays, cause abnormal display points due to infrared light emission, leading to malfunction and inability to maintain charge for voltage levels, as existing countermeasures are insufficient for light emitted by proximity sensors on the back face.
Innovation Solution
A proximity sensor is positioned to align with the specific display region, equipped with a light emitting element that synchronizes its emission with the image rewrite timing of the OLED display, controlling the emission to start and end before the rewrite timing, using a synchronization signal input unit and emission controller to minimize overlap with image rewriting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the proximity sensor emits infrared light continuously, then the detection function is maintained, but abnormal display points occur on the OLED display screen
Solution Approach 1:
The proximity sensor emits infrared light periodically at specific intervals rather than continuously. The emission timing is synchronized with the display refresh cycle, emitting light only during periods when the display is not rewriting image data, thereby eliminating abnormal display points while maintaining detection functionality through periodic measurements
Solution Approach 2:
The system determines the display rewrite timing in advance and schedules the infrared light emission to occur before the rewrite timing. By knowing when the display will rewrite data, the proximity sensor can proactively adjust its emission schedule to avoid interfering with the display process, preventing abnormal points before they occur
2Ease of manufacture
If the proximity sensor is disposed on the back face of the OLED display, then the structural integration is improved, but the infrared light emitted by the sensor causes abnormal points on the display screen
Solution Approach 1:
The proximity sensor on the back face emits infrared light periodically synchronized with the display refresh cycle. By controlling emission to occur only when the display is not actively rewriting data, the system maintains the integrated back-face structure while eliminating the harmful effect of light interference on the display screen
Solution Approach 2:
The proximity detection function continues to operate effectively through periodic emissions that are timed to coincide with display idle periods. This maintains continuous detection capability while ensuring that light emission never overlaps with display rewriting operations, preserving both structural integration and display quality
3Measurement precision
If the light emitting element emits light for a longer duration, then the detection accuracy is improved, but the overlap with image rewriting timing increases causing more abnormal points
Solution Approach 1:
The system uses periodic infrared light emission synchronized with the display refresh cycle. By emitting light at specific intervals aligned with display idle periods, the system achieves sufficient detection accuracy through multiple periodic measurements while ensuring each emission duration remains within safe limits that prevent overlap with image rewriting
Solution Approach 2:
The emission timing and duration parameters are dynamically adjusted based on the display rewrite timing. By changing these parameters to emit light only during display idle periods with controlled duration, the system optimizes detection accuracy while preventing interference with the display process
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 configuration significantly reduces the duration and occurrence of abnormal points on the display screen, ensuring stable image rendering and maintaining voltage levels by synchronizing light emission with the display's rewrite timing.
Implementation Method 1
a light emitting element configured to emit light
Implementation Method 2
a display device configured to rewrite data for a plurality of scanning lines sequentially, and including a display screen of the OLED display device
Data Source
AI summary
A proximity sensor comprises a light emitting element configured to emit light; a synchronization signal input unit configured to be input with a synchronization signal which is output from a display device and which indicates a rewrite timing of an image displayed on a display screen; and an emission controller configured to control emission of the light from the light emitting element, wherein the emission controller is configured to cause the light emitting element to start the emission of the light at a start timing set based on the rewrite timing at which rewriting of one of a plurality of scanning lines of the image is caused to start in the specific display region, and an emission time of the light from the light emitting element, and the emission controller is configured to cause the light emitting element to end the emission of the light before the rewrite timing comes.