Display Panel Driving Circuit Cost Reduction via Data Caching

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Solution Overview

Problem

The high manufacturing cost of timer control registers (TCONs) in display panels using double-data-rate (DDR) synchronous dynamic random access memory and corresponding DDR control modules for liquid crystal over driving is a significant issue.

Innovation Solution

A driving circuit and method for a display panel that includes a current-frame Nth-row data buffer module, a previous-frame Nth-row data buffer module, an over driving module, a source driver module, a switch module, and a signal inverter module, which cache and process data to generate drive voltage signals without relying on DDR memory, allowing for liquid crystal over driving while reducing TCON manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If DDR synchronous dynamic random access memory and DDR control module are employed to implement liquid crystal over driving, then the response speed is improved, but the manufacturing cost is severely increased

Engineering Contradiction:

Improveresponse speedVSAvoidmanufacturing cost

Core Design Contradiction:

SpeedVSEase of manufacture

Solution Approach 1:

The patent extracts the essential function of DDR memory (storing previous frame data) and implements it using simpler, lower-cost memory structures within the TCON, eliminating the need for expensive external DDR memory and control modules while maintaining liquid crystal over driving capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces expensive DDR synchronous dynamic random access memory with cheaper memory structures that can be integrated into the TCON, accepting that these simpler memory structures have shorter retention times but are sufficient for the over driving function

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Adaptability or versatility

If DDR synchronous dynamic random access memory and DDR control module are employed to implement liquid crystal over driving, then the liquid crystal over driving function is achieved, but the device complexity is increased

Engineering Contradiction:

Improveliquid crystal over driving functionVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the DDR control module functions with the TCON structure, integrating memory control, data processing, and over driving functions into a single unified device, thereby reducing the number of separate components and simplifying the overall system architecture

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The TCON is designed to perform multiple functions including data buffering, previous frame data storage, over driving calculation, and signal generation, eliminating the need for separate dedicated DDR control modules and making the TCON a multi-functional universal device

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10553185B2Driving circuit and method of display panel and display device

Publication Date: 2020.02.04 HKC CORP LTD

AI summary

Provided are a driving circuit and driving method of a display panel and a display device. A drive voltage signal converted from an Nth-row data of current-frame data is inverted into an Nth-row data of previous-frame data relative to next-frame data and the Nth-row data of previous-frame data relative to next-frame data is cached, so that the Nth-row data of previous-frame data can be cached without using a double-data-rate synchronous dynamic random access memory.