Backlight Adjustment Circuit for Uniform Illumination
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Solution Overview
Problem
Traditional backlight structures for liquid crystal display devices face challenges in adjusting brightness uniformly, leading to uneven backlighting and negative impacts on display quality due to the difficulty in adjusting the backlight after manufacturing.
Innovation Solution
A backlight adjustment circuit comprising a reference electrical information circuit, a feedback selection circuit, and a main control circuit that adjusts the current magnitude of light-emitting branches based on feedback electrical information, allowing for real-time control of brightness and uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional backlight structure is used, then manufacturing is simple, but brightness adjustment is difficult and uniformity is poor
Solution Approach 1:
The backlight is divided into multiple independent light-emitting branches (first light-emitting branch, second light-emitting branch, etc.), each capable of independent brightness adjustment. This segmentation allows precise control of each branch's brightness to achieve uniform overall backlighting while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The patent implements a feedback mechanism where the main control circuit receives electrical information from each light-emitting branch and compares it with reference electrical parameter information. Based on this feedback, the control circuit adjusts the current magnitude of each branch to maintain uniform brightness, resolving the contradiction between control precision and circuit complexity.
2Manufacturing precision
If brightness adjustment is added after manufacturing, then display quality can be improved, but the process becomes complex and uniformity is hard to achieve
Solution Approach 1:
The backlight adjustment functionality is integrated into the control circuit design before manufacturing completion. The main control circuit is pre-configured with reference electrical parameter information and feedback connections to each light-emitting branch, enabling brightness uniformity to be achieved during the manufacturing process itself rather than requiring complex post-manufacturing adjustment procedures.
Solution Approach 2:
By establishing feedback paths from each light-emitting branch to the main control circuit, the system automatically maintains brightness uniformity without requiring complex manual adjustment processes. The control circuit continuously monitors electrical information from each branch and makes real-time adjustments, simplifying the manufacturing process while ensuring consistent display quality.
3Manufacturing precision
If multiple light-emitting branches are controlled independently, then backlight uniformity is improved, but the number of control interfaces increases
Solution Approach 1:
The main control circuit is designed as a multi-functional unit that handles control signals for multiple light-emitting branches through a single integrated circuit. Rather than requiring separate control interfaces for each branch, the universal control circuit processes electrical information from all branches and coordinates their operation to achieve uniform backlighting, thereby reducing the overall number of interfaces needed.
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 real-time adjustment of light-emitting branches to achieve uniform backlighting, reducing the number of interfaces needed for the main control circuit and improving display quality by comparing reference electrical parameter information with feedback electrical information.
Implementation Method 1
the electrical information comparator is configured to compare the reference electrical parameter information and electrical information of the light-emitting device to obtain a comparison result
Implementation Method 2
the light-emitting device includes one or more light-emitting diodes connected in series
Implementation Method 3
the second transistor includes a field effect transistor
Data Source
AI summary
Disclosed is a backlight adjustment circuit including: a reference electrical information circuit, a feedback selection circuit, a main control circuit and at least two parallel light-emitting branches; where the reference electrical information circuit is connected to the main control circuit and is configured to provide reference electrical parameter information to the main control circuit; the feedback selection circuit is respectively connected to the main control circuit and the at least two light-emitting branches and is configured to provide the main control circuit with electrical information of each of the at least two light-emitting branches; and the main control circuit is connected to the at least two light-emitting branches and is configured to adjust a current magnitude of the each of the at least two light-emitting branches according to the reference electrical parameter information and the electrical information of the each of the at least two light-emitting branches.