Display Panel Brightness Calibration via Forward Voltage Detection
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Solution Overview
Problem
Light-emitting diode display devices experience light attenuation over time or under varying ambient temperatures, leading to inconsistent brightness across panels, which existing calibration methods using photosensitive instruments are costly and limited by installation environments.
Innovation Solution
A display device with multiple light panels and a control circuit that adjusts the driving current of new panels based on the forward voltage values of adjacent or surrounding panels to achieve consistent brightness, eliminating the need for additional photosensitive instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photosensitive instruments are used to measure and calibrate light panel brightness, then brightness value consistency can be achieved, but calibration cost increases and calibration convenience is reduced due to installation environment limitations
Solution Approach 1:
The system uses existing light panels as reference sources for calibrating new light panels. The control circuit automatically detects forward voltage values of adjacent light panels and uses these as reference standards, eliminating the need for external photosensitive instruments. This self-calibration mechanism improves convenience while maintaining brightness consistency.
Solution Approach 2:
The control circuit acts as an intermediary that mediates between the new light panel and reference light panels. It detects forward voltage values, calculates compensation values, and adjusts driving currents to achieve brightness consistency, replacing the need for direct measurement by photosensitive instruments.
2Manufacturing precision
If photosensitive instruments are used to measure and calibrate light panel brightness, then brightness value consistency can be achieved, but calibration cost increases
Solution Approach 1:
The system replaces expensive photosensitive instruments with the light panels themselves as reference standards. The existing light panels, which would otherwise serve as calibration references, are used directly in the calibration process, eliminating the need for costly external measurement equipment while maintaining calibration accuracy.
Solution Approach 2:
The light panels serve multiple functions: they are both the objects being calibrated and the reference standards for calibration. This multi-functionality eliminates the need for separate calibration instruments, reducing overall system cost while maintaining calibration capability.
3Productivity
If a target light panel replaces an old light panel, then display device can be maintained, but brightness inconsistency occurs between new and old panels
Solution Approach 1:
The control circuit performs preliminary detection of forward voltage values and calculates compensation values before the new light panel is fully activated. This preliminary calibration action ensures that when the new panel replaces the old one, brightness consistency is maintained without disrupting display device availability.
Solution Approach 2:
The system changes the driving current parameter of the new light panel based on detected forward voltage values and calculated compensation values. By adjusting this electrical parameter, the new panel's brightness is matched to the reference panels, maintaining consistency after replacement.
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 method ensures consistent brightness across panels without the need for costly photosensitive instruments, improving calibration convenience and reducing costs by using internal voltage adjustments.
Implementation Method 1
Each light panel includes multiple light-emitting diodes
Implementation Method 2
the driving circuit is used to drive the light-emitting diodes and detect a forward voltage value of at least one light-emitting diode among the light-emitting diodes as a forward voltage value of the corresponding light panel
Data Source
AI summary
A display device and a brightness adjustment method thereof are provided. The display device includes multiple light panels and a control circuit. Each light panel includes multiple light-emitting diodes, a driving circuit, and a storage circuit. The driving circuit is used to drive the light-emitting diodes and detect a forward voltage value of at least one light-emitting diode among the light-emitting diodes as a forward voltage value of a corresponding light panel. When a target light panel is used to replace one of the light panels, the control circuit controls forward voltage values of the target light panel and the reference light panel to become consistent.