Touch Panel Light Modulation Control for Flicker Reduction
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Solution Overview
Problem
Conventional mobile phone terminals experience unfavorable flicker on the display due to rapid light-dark variations detected by the illuminance sensor, leading to repeated changes in backlight intensity, which can be distracting for the user.
Innovation Solution
A terminal apparatus with a light modulation unit, an illuminance sensor, a proximity sensor, and determination units that suspend automatic light modulation of the touch panel when a user's finger unintentionally interacts with the illuminance sensor, preventing abrupt changes in backlight intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If automatic light modulation is enabled based on illuminance sensor output, then the display adapts to environmental lighting conditions, but unintended finger interactions cause rapid light-dark variations and display flicker
Solution Approach 1:
The proximity sensor acts as an intermediary between the illuminance sensor and the light modulation unit. When the proximity sensor detects a finger approaching the illuminance sensor, it triggers a flag that prevents the illuminance sensor's output from causing backlight intensity changes, thereby filtering out unintended interactions while preserving adaptive lighting functionality
Solution Approach 2:
The system uses feedback from both the illuminance sensor and proximity sensor to dynamically control light modulation. The proximity sensor's detection state feeds back to the light modulation unit to determine whether illuminance changes should trigger backlight adjustments, creating a conditional feedback mechanism that distinguishes between intentional and unintentional finger interactions
2Measurement precision
If the illuminance sensor is provided adjacent to the touch panel for detecting ambient brightness, then light modulation control is improved, but finger operations near the sensor cause false illuminance variations
Solution Approach 1:
The proximity sensor serves as an intermediary that monitors the physical state near the illuminance sensor. When it detects a finger in the vicinity, it activates a protective flag that blocks false illuminance signals from reaching the light modulation unit, thereby eliminating the harmful effect of finger operations while preserving the sensor's placement benefits
Solution Approach 2:
The system applies preliminary anti-action by using the proximity sensor to detect finger approach before false illuminance variations occur. The proximity detection triggers a preventive flag that blocks subsequent illuminance sensor outputs, counteracting potential false readings before they can affect backlight modulation
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 solution maintains the brightness of the display by suspending automatic light modulation until a predetermined time has elapsed, reducing flicker and improving user experience by preventing unintended changes in backlight intensity.
Implementation Method 1
an illuminance sensor provided adjacent to the touch panel
Implementation Method 2
a proximity sensor provided adjacent to the illuminance sensor
Data Source
AI summary
A terminal apparatus includes a light modulation unit to perform an automatic light modulation of a touch panel, an illuminance sensor, a proximity sensor, an illuminance determination unit to determine whether or not an illuminance detected by the illuminance sensor varies, and an operation determination unit to determine whether or not an operation of the touch panel occurs near the illuminance sensor, wherein the light modulation unit suspends the automatic light modulation when the operation of the touch panel occurs before a first time elapses after the detected illuminance decreases, and the light modulation unit suspends the automatic light modulation when the operation determination unit determines that the operation of the touch panel does not occur before the first time elapses after that the detected illuminance decreases and then the proximity sensor detects an object before a second time elapses.