Display Backlight Dimming Block Temperature Prediction
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Solution Overview
Problem
Local dimming in display apparatuses can cause temperature rises due to peak current driving, potentially leading to damage or inefficiency in power consumption.
Innovation Solution
A display apparatus that predicts the temperature of each dimming block based on a dimming signal and current-specific temperature profile information, and adjusts the current supplied to each dimming block accordingly to prevent temperature rises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If local dimming is performed to improve power consumption and contrast ratio, then power consumption is reduced and contrast ratio is increased, but temperature rises due to peak current driving which may cause damage or inefficiency
Solution Approach 1:
The system performs preliminary temperature prediction for each dimming block before actual operation by using temperature profile information stored in advance. This allows the control unit to anticipate temperature rises and adjust currents proactively, preventing temperature-related damage while maintaining local dimming benefits for power consumption and contrast ratio improvement.
Solution Approach 2:
The system uses stored temperature profile information as feedback to adjust the driving current for each dimming block. By comparing the predicted temperature with safe operating thresholds and using this feedback to modulate current supply, the system maintains optimal temperature levels while preserving the energy-saving and contrast-enhancing effects of local dimming.
2Illumination intensity
If peak current is applied to some regions for local dimming, then contrast ratio is improved, but temperature rises which may result in damage to the display apparatus
Solution Approach 1:
The system applies different current levels to different dimming blocks based on their specific temperature profiles and requirements. Rather than uniform treatment, each region receives customized current control that matches its thermal characteristics, allowing high contrast ratio in regions that can tolerate it while protecting regions prone to temperature rise.
Solution Approach 2:
Temperature profile information is stored in advance for each dimming block, enabling the control unit to predict potential temperature rises before they occur. This preliminary knowledge allows the system to preemptively adjust current levels to prevent damage while maintaining the contrast ratio enhancement benefits of localized high-current driving.
3Use of energy by stationary object
If local dimming is implemented to vary brightness for each region, then power consumption is reduced, but temperature management becomes more complex
Solution Approach 1:
The backlight unit is divided into multiple independent dimming blocks, each with its own temperature profile and control mechanism. This segmentation allows independent temperature management for each region, simplifying the overall temperature control strategy by treating each block separately based on its specific thermal characteristics while maintaining system-wide power consumption reduction.
Solution Approach 2:
Each dimming block is equipped with its own stored temperature profile information, enabling self-assessment and self-regulation of thermal conditions. The control unit can query and use this pre-stored information to automatically adjust current levels without requiring complex real-time temperature sensing or external intervention, reducing management complexity while preserving energy efficiency.
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 effectively prevents temperature rises and associated inefficiencies or damage, while improving power consumption and contrast ratio by dynamically adjusting current supply based on predicted temperatures.
Implementation Method 1
Each light source may include a light emitting diode (LED) or an organic light emitting diode (OLED)
Implementation Method 2
predict a temperature for each of the plurality of dimming blocks based on a dimming signal corresponding to an input image and current-specific temperature profile information corresponding to the plurality of dimming blocks
Implementation Method 3
control a supply current for each of the plurality of dimming blocks based on the dimming signal
Data Source
AI summary
A display apparatus is provided. The display apparatus includes: a backlight unit including a substrate and light sources configured to emit light to a liquid crystal panel; and a processor configured to: identify a plurality of dimming blocks, each of which includes at least one light source among the plurality of light sources; predict a temperature for each of the plurality of dimming blocks based on a dimming signal corresponding to an input image and current-specific temperature profile information corresponding to the plurality of dimming blocks; update the dimming signal based on the temperature predicted for each of the plurality of dimming blocks; and control a supply current for each of the plurality of dimming blocks based on the dimming signal.