Light Source Module Driving Method for LCD Glare Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses produce more glare and have different luminance distribution compared to other display types, leading to increased user eye strain, and existing methods for improving contrast ratio and reducing power consumption are inadequate.
Innovation Solution
A method for driving a light source module with multiple light-emitting blocks, where the driving mode for each block is determined by analyzing grayscale values, and a second driving signal with a higher level is applied to blocks in a boosting mode to adjust luminance based on the size of bright images, optimizing luminance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If local dimming method is used to control light sources individually, then contrast ratio is improved and power consumption is reduced, but display quality is not sufficiently improved due to inadequate luminance adjustment
Solution Approach 1:
The patent applies dynamics by introducing a boosting mode that dynamically adjusts the driving signal level based on the size of bright images in the display content. The system transitions from static local dimming to dynamic luminance adjustment, where the driving signal level is modified according to real-time image analysis, enabling adaptive luminance control that improves display quality while maintaining energy efficiency.
2Object-generated harmful factors
If LCD apparatus uses backlight assembly to generate light, then image display is achieved, but glare is increased and luminance distribution is different from other display types
Solution Approach 1:
The patent applies local quality by dividing the light source into multiple light-emitting blocks that can be independently controlled. Each block is assigned a specific driving mode (normal mode or boosting mode) based on the luminance requirements of corresponding pixel regions. This localized control allows different regions to operate at different luminance levels, reducing overall glare while maintaining appropriate luminance distribution in bright image areas.
3Illumination intensity
If driving signal level is increased for boosting mode, then luminance value is adjusted for small bright images, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining two distinct driving modes (normal mode and boosting mode) with predetermined driving signal levels. The system analyzes image content in advance to determine which mode should be applied to each light-emitting block, and the appropriate driving signal is prepared and applied accordingly. This pre-planned approach simplifies the control logic compared to continuous dynamic adjustment, while still achieving the desired luminance optimization.
Data Source
AI summary
A method for driving a light source module, the light source module including a plurality of light-emitting blocks, a driving mode of the light-emitting block providing light to a plurality of pixels displaying a unit image is determined by analyzing grayscale values corresponding to the pixels. A second driving signal is applied to the light-emitting block determined to be in a boosting mode, the second driving signal having a level higher than the level of a first driving signal applied to the light-emitting block determined to be in a normal mode.