Matrix Backlight Unit With Sequential Scanning For Panel Adaptability
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Solution Overview
Problem
Existing backlight units for liquid crystal displays are inefficient and costly due to their fixed channel configurations, which do not adapt well to varying panel sizes, leading to increased manufacturing costs and suboptimal light control.
Innovation Solution
A matrix-form backlight unit with a light source controller and driving units that include unit selection, sample and hold units, PWM controllers, and shift registers, allowing for sequential driving and dimming of light source units, enabling flexible control of brightness and adaptability to different panel sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-channel driving module is used, then the module structure is simple, but it cannot adapt to liquid crystal panels of various sizes
Solution Approach 1:
The backlight unit is divided into multiple independent light source units arranged in a matrix, with each unit controllable by separate driving circuits. This segmentation allows flexible configuration to match different panel sizes while maintaining a standardized modular structure that can be scaled.
Solution Approach 2:
The patent implements dynamic control of light source units through sequential scanning and PWM dimming signals. The driving module can adaptively activate different numbers and arrangements of light source units based on the actual panel size, transforming a static fixed-channel design into a dynamic adaptable system.
2Area of stationary object
If more light source units are added to match larger panels, then panel coverage is improved, but manufacturing cost increases
Solution Approach 1:
The driving module is designed with universal functionality to control variable numbers of light source units through standardized interfaces. By using PWM dimming and sequential scanning techniques, the same basic driving circuit architecture can accommodate different panel sizes without requiring completely different hardware designs, thereby reducing manufacturing costs.
Solution Approach 2:
The patent controls the number of active light source units and their brightness by changing electrical parameters (PWM duty cycle, scanning frequency, enabling/disabling specific channels) rather than physically redesigning the hardware. This parameter-based adaptation allows cost-effective scaling to different panel sizes.
3Productivity
If traditional driving modules are used, then the design is simple, but brightness control efficiency is poor
Solution Approach 1:
The patent implements periodic scanning of light source unit rows combined with PWM dimming control. By sequentially scanning through rows and using pulse-width modulation for brightness adjustment, the system achieves efficient brightness control with improved responsiveness and energy efficiency compared to traditional continuous driving methods.
Solution Approach 2:
The patent introduces sample-and-hold circuits as intermediary elements between the control signals and the light source units. These intermediaries buffer and condition the dimming signals, improving the precision and efficiency of brightness control while isolating the complexity from both the control logic and the light emitting components.
Data Source
AI summary
A backlight unit includes a plurality of light source units arranged in a matrix form, a light source controller outputting a dimming signal to control a brightness of the light source units and a latch signal to control a light source unit row of the plurality of light source units to be sequentially driven according to a predetermined scanning period, and a plurality of light source driving units connected to light source unit columns of the plurality of light source units and supplying driving signals corresponding to the dimming signal to the light source units in the light source unit columns.