Display Driver Overdrive Control for Thermal Response Balance

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Solution Overview

Problem

High-definition liquid crystal display devices face challenges in achieving high-speed response due to increased heat generation from overdrive processing, leading to potential image degradation and operational issues.

Innovation Solution

A display driver with an overdrive control circuit that detects internal temperature and adjusts or stops overdrive processing when temperatures exceed a predetermined threshold, balancing response speed with heat management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If overdrive processing is applied to increase response speed, then response speed is improved, but electric power consumption increases causing heat generation

Engineering Contradiction:
Improveresponse speedVSAvoiddisplay driver temperature
Core Design Contradiction:
SpeedVSTemperature

Solution Approach 1:

The patent applies dynamics by making the overdrive processing controllable and adjustable based on temperature conditions. The overdrive control circuit dynamically switches between overdrive mode and normal mode according to real-time temperature detection, allowing the system to adapt its behavior rather than operating in a fixed state. This resolves the contradiction by enabling high response speed when temperature is acceptable while preventing thermal runaway when temperature exceeds the threshold.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements feedback through the temperature detection circuit that continuously monitors the display driver's temperature and provides this information to the overdrive control circuit. The control circuit then adjusts overdrive processing based on this feedback signal, creating a closed-loop control system. This feedback mechanism allows the system to automatically reduce overdrive processing when temperature becomes too high, thus preventing excessive heat generation while maintaining optimal response speed under acceptable temperature conditions.

Inventive Principle:
Principle #23Feedback

2Speed

If overdrive processing is applied to increase response speed, then response speed is improved, but image degradation occurs due to heat generation

Engineering Contradiction:
Improveresponse speedVSAvoiddisplay driver operation normality
Core Design Contradiction:
SpeedVSReliability

Solution Approach 1:

The system dynamically adjusts overdrive processing based on temperature conditions, switching between high-performance mode and protective mode. This dynamic adaptation ensures that the display driver operates at optimal speed when temperature is acceptable while automatically reducing stress on the device when temperature exceeds safe thresholds, thereby preventing image degradation and maintaining operational reliability.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent applies beforehand cushioning by detecting temperature before it reaches critical levels and preemptively reducing or stopping overdrive processing. This preventive approach avoids the harmful effects of excessive heat generation that would cause image degradation, rather than reacting after damage has occurred. The system builds a safety margin by monitoring temperature trends and adjusting operation before thermal damage can occur.

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

3Temperature

If overdrive processing is stopped to reduce temperature, then heat generation is reduced, but response speed decreases

Engineering Contradiction:
Improvedisplay driver temperatureVSAvoidresponse speed
Core Design Contradiction:
TemperatureVSSpeed

Solution Approach 1:

The system dynamically switches between overdrive and normal processing modes based on real-time temperature conditions. When temperature is within the acceptable range, the system operates in overdrive mode for high response speed. When temperature exceeds the threshold, it transitions to normal mode to reduce heat generation. This dynamic switching allows the system to optimize for speed when thermally safe and optimize for thermal management when needed, resolving the contradiction between these two objectives.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentUS12062347B2Display driver and display device
Publication Date: 2024.08.13 LAPIS SEMICON CO LTD
  • US12062347B2 patent drawing
  • US12062347B2 patent drawing
  • US12062347B2 patent drawing

AI summary

A display driver according to the present invention generates a plurality of driving voltages based on a video signal and applies the respective driving voltages to a plurality of source lines of a display panel. The display driver includes an overdrive part and an overdrive control circuit. The overdrive part executes an overdrive processing to increase amplitudes of the driving voltages. The overdrive control circuit detects an internal temperature of the display driver and stops the overdrive processing by the overdrive part when the temperature is higher than a predetermined temperature threshold.