Daisy Chain LED Backlight Control for Brightness Detection
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Solution Overview
Problem
The complexity and size of backlight systems in liquid crystal displays using partial driving type LED backlights are increased due to the need for multiple photosensitive sensors, leading to complications in wire management and potential inaccuracies in brightness detection, especially when the number of partial driving blocks is large.
Innovation Solution
A light emission control system with a central controller and light emitting module controllers organized in a daisy chain configuration, where each light emitting module has a photosensitive sensor for brightness detection, and module IDs are assigned to prevent simultaneous brightness detection in neighboring modules, allowing for sequential light emission and reduced wire requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple photosensitive sensors are provided for each partial driving block to detect brightness accurately, then brightness detection precision is improved, but device complexity and size increase due to additional wires and components
Solution Approach 1:
Multiple photosensitive sensors are electrically connected in parallel to a single output line, merging their detection functions into a unified signal path. This allows brightness detection from multiple blocks to be aggregated without requiring separate wire paths for each sensor, thereby reducing wire complexity while maintaining measurement precision.
Solution Approach 2:
The single output line serving the parallel-connected photosensitive sensors performs multiple functions: it collects detection signals from multiple partial driving blocks, transmits aggregated brightness information, and eliminates the need for separate dedicated wires for each sensor. This multi-functional approach reduces overall device complexity.
2Ease of manufacture
If the number of partial driving blocks is increased to reduce wire complexity for light emitting elements, then ease of manufacture is improved, but brightness detection accuracy deteriorates due to light interference from neighboring blocks
Solution Approach 1:
Photosensitive sensors from multiple partial driving blocks are connected in parallel to a common output line, combining their detection capabilities. This allows the system to handle interference from neighboring blocks by aggregating signals across multiple sensors, maintaining detection accuracy even as the number of blocks increases and individual block isolation becomes more challenging.
3Adaptability or versatility
If a photosensitive sensor is provided for each partial driving block to enable independent brightness control, then adaptability is improved, but device complexity increases due to the need for multiple sensors and their associated wiring
Solution Approach 1:
The parallel connection architecture merges multiple sensor outputs into a unified signal path while preserving the ability to independently control each partial driving block's brightness. The central controller can still address and control individual blocks through their respective control lines, maintaining adaptability while the parallel sensor configuration reduces overall wiring complexity.
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 configuration enables a more compact and accurate brightness detection system by distributing control information efficiently, reducing wire complexity and preventing crosstalk between neighboring modules, thus maintaining stable display brightness with fewer wires.
Implementation Method 1
detect the light brightness of the light emitting element by a photosensitive sensor
Data Source
AI summary
The present invention provides a light emission control system including a plurality of light emitting modules each including a plurality of light emitting elements and each being a unit to be controlled, light emitting module controllers each provided for each of the light emitting modules and controlling a corresponding light emitting module, and central controller controlling the light emitting modules. The plurality of light emitting module controllers are divided into a plurality of groups, a plurality of light emitting module controllers belonging to each of the groups are connected in a cascade manner within the group, the plurality of groups are connected in parallel with the central controller, and control information transmitted from the central controller to each of the plurality of groups is sequentially transferred from a light emitting module controller to a following light emitting module controller in each of the groups.