Backlight Module Chromaticity Compensation via Segmented Light Sources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-brightness liquid-crystal displaying modules face challenges with chromaticity deviation due to temperature variations during the initial startup to thermal equilibrium phase, leading to decreased displaying quality.
Innovation Solution
A backlight module comprising a white-light source and a compensating light source, along with a driving unit that adjusts the driving currents of the compensating light source based on environmental temperature, to maintain the white-dot chromaticity coordinate within a preset range during the compensation time duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight brightness is increased to satisfy high brightness requirements, then the brightness is improved, but heat generation increases causing chromaticity deviation
Solution Approach 1:
The backlight source is segmented into a white-light source and a compensating light source with different wavelength ranges. The compensating light source emits light in a wavelength range that compensates for the chromaticity deviation caused by the white-light source during thermal equilibrium, allowing the system to maintain stable chromaticity while providing high brightness.
Solution Approach 2:
The driving currents of the compensating light source are dynamically adjusted based on environmental temperature parameters. The primary driving module modifies the driving parameters of the compensating light source according to temperature changes during the thermal equilibrium phase, enabling real-time compensation of chromaticity deviation while maintaining high brightness output.
2Power
If the quantity of LEDs and LED driving current are increased to raise backlight brightness, then the brightness is improved, but heat generation and chromaticity deviation worsen
Solution Approach 1:
The backlight system is divided into two functional segments: the white-light source that provides high brightness and the compensating light source that corrects chromaticity deviation. This segmentation allows the system to achieve high power output while maintaining chromaticity stability through the coordinated operation of the two segments.
Solution Approach 2:
The primary driving module implements feedback control by monitoring environmental temperature and dynamically adjusting the driving currents of the compensating light source. This feedback mechanism ensures that chromaticity deviation is continuously compensated while maintaining high backlight power output.
3Stability of the object's composition
If the displaying module operates for 30-60 minutes to reach thermal equilibrium, then temperature stability is improved, but chromaticity deviation occurs during the temperature rise phase
Solution Approach 1:
The compensating light source is activated during the thermal equilibrium phase (30-60 minutes) to preemptively compensate for chromaticity deviation before temperature stability is fully achieved. The primary driving module adjusts the compensating light source's driving currents based on real-time temperature changes, ensuring chromaticity stability throughout the warming-up period.
Solution Approach 2:
The driving parameters of the compensating light source are dynamically changed according to environmental temperature during the thermal equilibrium phase. The primary driving module modifies the driving currents based on temperature sensors, enabling real-time compensation of chromaticity deviation while the system transitions to thermal equilibrium.
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
The solution effectively reduces chromaticity deviation and maintains stable color temperature, thereby improving displaying quality and extending the thermal equilibrium time of high-brightness products.
Implementation Method 1
the compensating light source comprises a blue-light source; or the compensating light source comprises a blue-light source and a red-light source; or the compensating light source comprises a red-light source, a green-light source and a blue-light source
Data Source
AI summary
A backlight module includes a backlight source and a backlight driving unit. The backlight source includes a white-light source and a compensating light source. The backlight driving unit includes a primary driving module and a compensating driving module. The primary driving module, within a compensation time duration, according to a current environmental temperature, selects a compensation-driving function corresponding to the current environmental temperature; and according to the selected compensation-driving function, supplies a compensation controlling signal to the compensating driving module. The compensating driving module acquires the compensation controlling signal, and according to the compensation controlling signal, supplies a driving signal to the compensating light source. The compensating light source acquires the driving signal, and emits light when driven by the driving signal, whereby a variation value of a white-dot chromaticity coordinate of the displaying module within the compensation time duration is within a preset range.