Backlight Module Sequential Color Driving for Power Reduction
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Solution Overview
Problem
Existing backlight modules for liquid crystal displays using Field Sequential Color technology do not provide sufficient functionality for efficient color switching and power management, particularly in terms of sequential color emission and power consumption.
Innovation Solution
A backlight module comprising light-emitting devices arranged in arrays with separate transistors for red, green, and blue light-emitting devices, along with driving and control modules that sequentially activate these devices using control signals, and a method of driving the module to emit light in specific time periods for each color, optimizing power usage and color switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate transistors are used for each color of light-emitting device, then color switching precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the light-emitting devices into separate groups by color (red, green, blue) with dedicated transistors for each color. This segmentation allows independent control of each color channel, achieving precise color switching while maintaining manageable device complexity through systematic organization.
Solution Approach 2:
Different transistors are assigned to different color channels based on their specific control requirements. Each transistor is optimized for its specific color group, enabling precise local control of color emission timing and intensity without affecting other color channels.
2Use of energy by moving object
If sequential color emission is implemented, then power consumption is reduced, but operation time increases
Solution Approach 1:
The patent implements sequential color emission by activating red, green, and blue light-emitting devices in periodic cycles rather than simultaneously. Each color is activated in succession during specific time periods, reducing overall power consumption while maintaining continuous operation through rapid cycling that exploits human visual persistence.
3Illumination intensity
If color filter layer is eliminated, then light transmittance increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent removes the traditional color filter layer from the display structure and replaces it with independently controllable red, green, and blue light-emitting devices. This extraction of the color filtering function and its replacement with direct color emission eliminates the need for precision color filter alignment while achieving full-color display capability.
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 enables efficient sequential color emission, reduces power consumption, and allows for fine adjustment of backlight brightness, potentially eliminating the need for a color filter layer in liquid crystal displays, thereby reducing thickness and increasing light transmittance.
Implementation Method 1
a plurality of light-emitting devices arranged in an array of multiple rows and multiple columns, each row comprising a plurality of first light-emitting devices for emitting red light, a plurality of second light-emitting devices for emitting green light and a plurality of third light-emitting devices for emitting blue light
Data Source
AI summary
Disclosed is a backlight module which includes a plurality of light-emitting devices arranged in an array of multiple rows and multiple columns. Each row of light-emitting devices include a plurality of first light-emitting devices for emitting red light, a plurality of second light-emitting devices for emitting green light and a plurality of third light-emitting devices for emitting blue light. The first light-emitting device, the second light-emitting devices and the third light-emitting devices in each row of light-emitting devices are driven to sequentially emit light based on respective data signals in a light-emitting phase. Further disclosed are a method of driving the backlight module and a display device.