LCD Light Source with Sequentially Controlled Sections
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Solution Overview
Problem
In LED backlight systems for liquid crystal displays, fluctuations in illumination light intensity and chromaticity occur due to varying distances between light-sensing devices and lighting sections during sequential lighting operations, making it difficult to maintain consistent light intensity and color balance.
Innovation Solution
A light source device with independently controllable lighting sections, a drive mechanism for sequential lighting, and a control system using a light-sensing device to adjust light emission based on signals from a specific lighting section, synchronized with the lighting period to stabilize light reception signals and reduce part complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If sequential lighting operation is performed with multiple lighting sections, then video response is improved, but light amount received by light-sensing device fluctuates due to varying distances
Solution Approach 1:
The light source is divided into multiple independently controllable lighting sections that can be sequentially activated. This segmentation allows the system to perform sequential lighting operations to improve video response while managing light distribution across different spatial positions.
Solution Approach 2:
A light-sensing device detects the light amount from each lighting section, and this detection information is fed back to a control device. The control device uses this feedback to adjust the light emission amount of each lighting section, ensuring stable light reception despite varying distances during sequential operation.
2Measurement precision
If light guide is arranged in each LED group to reduce distance error, then light amount accuracy is improved, but number of parts increases and manufacturing cost increases
Solution Approach 1:
A single light-sensing device is designed to receive light from multiple lighting sections sequentially. This universal light-receiving approach eliminates the need for separate light guides for each LED group, reducing part complexity while maintaining measurement accuracy through sequential detection and feedback control.
Solution Approach 2:
The system changes the operational parameters by sequentially activating different lighting sections and adjusting their light emission amounts based on detected values. This parameter-based control approach replaces the need for physical light guides, achieving accurate light amount control through software/firmware control rather than additional optical components.
3Stability of the object's composition
If feedback control is applied to each lighting section, then fluctuations in intensity and chromaticity are reduced, but control system complexity increases
Solution Approach 1:
The light-sensing device provides feedback on the light amount from each lighting section, and the control device adjusts the light emission amount of each section based on this feedback. This feedback mechanism stabilizes both intensity and chromaticity by compensating for variations in each lighting section's output.
Solution Approach 2:
The control device integrates the control of multiple lighting sections into a single unified control system. By combining the detection and control functions into one centralized device, the system achieves stable light output across multiple sections without requiring separate complex control circuits for each section.
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 reduces fluctuations in illumination light intensity and chromaticity, improving image quality by maintaining consistent light emission across the display, while minimizing the number of parts and manufacturing costs.
Implementation Method 1
when the LED backlight system performs sequential lighting operation (in this case, sequential light-off), the light emission amount of each LED group (each lighting section) is controlled based on information of the light amount variations detected by a photosensor section
Data Source
AI summary
A light source device capable of further reducing fluctuations in the intensity or the like of illumination light with a simple configuration is provided. The light source device may include a light source including a plurality of lighting sections controllable independently of one another; a drive means for driving the light source so that the lighting sections are sequentially turned on; a light-sensing device receiving light from the light source in which the lighting sections are sequentially turned on; and a control means for controlling the drive means on the basis of a light receiving signal obtained by the light-sensing device from a specific lighting section so as to control the light emission amount of each lighting section.