Liquid Crystal Display Data Transition Control Circuit
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Solution Overview
Problem
Liquid crystal display devices suffer from slow response speeds, leading to motion blurring and reduced picture quality due to increased heat generation and electromagnetic interference (EMI) caused by data transitions between the lookup table and memory in overdriving circuits.
Innovation Solution
A liquid crystal display device and driving method that reduces data transitions by comparing transitions between previous, current, and next data to determine inversion, using a data transition part, memory, data reverse transition part, and lookup table to minimize heat generation and EMI, thereby improving response characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If overdriving method is used to improve response speed, then response speed is improved, but heat generation and EMI increase due to data transitions between lookup table and memory
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing transition information in the lookup table before data is actually transmitted. The transition part determines whether data transition is needed and generates control signals in advance, allowing the system to prepare for potential data transitions without actually performing unnecessary data transmissions, thereby reducing heat generation and EMI while maintaining improved response speed.
2Object-generated harmful factors
If data transitions are reduced by inversion, then heat generation and EMI are minimized, but circuit complexity increases due to data transition part and reverse transition part
Solution Approach 1:
The patent applies local quality by implementing data transition reduction only in specific locations where it is most beneficial - between the lookup table and memory interface. The transition part and reverse transition part are localized components that operate only when needed, rather than complicating the entire data processing system. This targeted approach minimizes heat generation and EMI in the critical data path while keeping the rest of the circuit relatively simple.
3Object-affected harmful factors
If lookup table stores modulated data for overdriving, then motion blurring is reduced, but data transitions between lookup table and memory increase causing EMI
Solution Approach 1:
The patent applies feedback by using the transition detection capability to monitor data changes between the lookup table and memory. The transition part detects when data transitions occur and generates control signals accordingly, creating a feedback mechanism that allows the system to adapt its data transmission behavior. This feedback loop enables the system to maintain the benefits of modulated data for reducing motion blurring while actively managing and reducing EMI-causing data transitions through intelligent control signal generation.
Data Source
AI summary
A liquid crystal display device includes a data transition part to compare a number of transitions between a previous data and a current data and to compare a number of transitions between the current data and a next data to determine whether or not the current data is to be inverted in accordance with a comparison result thereof, and to determine whether or not the current data is to be inverted in accordance with a high level number difference of the data, thereby generating a reverse signal when the current data is inverted, a memory to store a data from the data transition part, a data reverse transition part to reversely convert the data from the memory using the reverse signal, a lookup table to compare the current data and the previous frame data reversely converted by the data reverse transition part to select a modulated data and a display drive circuit to display the data from the lookup table on a liquid crystal display panel.