Under-Display Proximity Sensor Timing to Prevent OLED Screen Blinking
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Solution Overview
Problem
Full-screen electronic devices experience screen blinking due to proximity sensors emitting infrared light, which affects the display effect.
Innovation Solution
A light sensor status control method that determines display and non-light-emitting time periods in an image refresh cycle and controls the optical transmitter to transmit an infrared signal only during non-light-emitting times, avoiding interference with the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the proximity sensor is disposed under the display area to implement full-screen design, then the screen coverage is improved, but the screen blinks due to infrared light emission affecting display effect
Solution Approach 1:
The optical transmitter of the proximity sensor is controlled to transmit infrared light periodically during non-light-emitting time periods of the OLED display screen. By synchronizing the infrared light transmission with the display refresh cycle, the harmful infrared emission is confined to specific time windows when the display pixels are not emitting light, thereby eliminating screen blinking while maintaining full-screen coverage
Solution Approach 2:
The processor predicts the non-light-emitting time period of the display screen in advance based on the image refresh frequency, and controls the optical transmitter to transmit infrared light only during these predicted time periods. This preliminary timing coordination ensures that infrared emission never overlaps with display light emission, preventing screen blinking before it occurs
2Reliability
If the optical transmitter transmits infrared light continuously, then the proximity detection function is maintained, but the display effect deteriorates due to screen blinking
Solution Approach 1:
Instead of continuous transmission, the infrared light transmission is converted to periodic pulses that occur only during non-light-emitting time periods. This periodic transmission pattern maintains sufficient infrared signal strength for reliable proximity detection while eliminating the harmful effect of continuous infrared emission on the display
Solution Approach 2:
The optical transmitter's working state is dynamically adjusted based on the display screen's light emission status. The processor controls the optical transmitter to switch between transmitting and non-transmitting states according to the real-time display refresh cycle, optimizing both detection reliability 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
Prevents screen blinking by ensuring the proximity sensor's infrared light transmission does not overlap with the display time, thereby improving the display effect.
Implementation Method 1
an optical transmitter of the light sensor emits infrared light
Implementation Method 2
pixels in a display area that is of the OLED display screen emit light
Data Source
AI summary
A light sensor status control method, includes: a processor (110) determines a display time period and a non-light-emitting time period in a image refresh cycle (501); and the processor (110) controls an optical transmitter of a light sensor (180G) to transmit an optical signal when pixels in a display area that is of an OLED display screen (194) and that corresponds to the light sensor do not emit light in the image refresh cycle, and the processor (110) controls the optical transmitter not to transmit an optical signal when the pixels in the display area that is of the OLED display screen (194) and that corresponds to the light sensor (180G) emits light (502). Therefore, a problem that the screen blinks because the light sensor emits infrared light is alleviated, and a display effect of the screen is improved.