Display Panel Brightness Sensing Without Ambient Light Sensors
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Solution Overview
Problem
The use of ambient light sensors in display devices increases manufacturing costs, and existing brightness adjustment methods are affected by flicker and leakage currents, leading to inaccurate brightness detection and increased power consumption.
Innovation Solution
A brightness control method and device utilizing thin film transistors in parallel configurations for ambient light detection and reference modules, with controlled voltage signals and pulse frequencies to minimize leakage currents and flicker effects, allowing accurate brightness adjustment without separate ambient light sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an ambient light sensor is used to detect ambient brightness, then brightness detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent creates an internal reference environment that copies the external ambient light conditions through the display panel itself. By displaying a reference gray level that matches the ambient brightness, the system uses the display's own pixels as both the test object and the reference standard, eliminating the need for external sensors while maintaining detection accuracy
Solution Approach 2:
The display panel performs self-diagnosis by using its own display elements to detect ambient brightness. The same pixel circuitry that displays images is also used to present reference gray levels and measure ambient light conditions, allowing the system to serve its own measurement needs without additional dedicated components
2Device complexity
If traditional brightness detection methods are used, then device complexity is reduced, but measurement precision deteriorates due to flicker and leakage currents
Solution Approach 1:
The patent implements periodic detection cycles where the display alternates between showing the ambient image and displaying reference gray levels. This periodic switching allows the system to sample brightness at multiple time points and calculate average values, effectively filtering out flicker effects and transient leakage currents while maintaining simple circuitry
Solution Approach 2:
The brightness detection process continues continuously through multiple sampling cycles rather than being a single instantaneous measurement. By accumulating detection results over several periods and computing averages, the system maintains continuous monitoring capability while eliminating the impact of transient electrical disturbances
3Measurement precision
If multiple detection cycles are performed to eliminate flicker effects, then brightness detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent performs more detection cycles than the minimum single measurement would require, but stops before completing a full excessive number of cycles. By performing a moderate number of detection cycles (e.g., 3-5 cycles) and calculating average values, the system achieves sufficient flicker elimination while limiting additional power consumption to an acceptable level
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 approach reduces manufacturing costs by eliminating the need for ambient light sensors and enhances brightness detection accuracy and stability, improving power efficiency and user experience.
Implementation Method 1
the brightness detection module includes a plurality of first thin film transistors connected in parallel and the first thin film transistors are configured to receive ambient light
Data Source
AI summary
Provided are a brightness control method and apparatus for a display panel. The brightness control method includes: loading a measurement pulse-signal to a source of a first thin film transistor of a brightness measurement module in a display panel and a source of a second thin film transistor of a reference module, loading an adjustment control-signal to a gate of the first and second thin film transistors, the adjustment control-signal is a fixed voltage signal, the range of a voltage difference between the adjustment control-signal and a drain of the second thin film transistor is −2V-2V, the voltage range of an active level of the measurement pulse-signal is 3V-14V; detecting a brightness measurement signal output by the brightness measurement module, detecting a reference signal output by the reference module; adjusting the brightness of the display panel by means of detected brightness measurement signal and reference signal.