LCD Data Driving IC Voltage Detection Integration

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Solution Overview

Problem

Existing LCD driving circuits face issues with residual image formation due to slow discharge of electric charge when powered off, leading to incorrect operation of gate and data driving circuits, and the large volume of primary control circuit boards and special conducting leads required for voltage detection.

Innovation Solution

Integration of a voltage detecting circuit within the data driving IC, which generates an all-scanning signal when the operation voltage falls below a threshold, allowing quick discharge of electric charge without the need for a separate primary control circuit board and special conducting leads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the voltage detecting circuit is integrated in the data driving IC, then the device complexity is reduced and volume is decreased, but the measurement precision requirement increases

Engineering Contradiction:

Improvecircuit configurationVSAvoidvoltage detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The voltage detecting circuit is integrated into the data driving IC, merging two previously separate functions (voltage detection and data driving) into a single device. This eliminates the need for a separate voltage detecting circuit on the primary control circuit board and reduces the number of conducting leads required on the FPCB.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If the voltage detecting circuit is placed on the primary control circuit board, then the voltage detection function is achieved, but the volume of the primary control circuit board increases

Engineering Contradiction:

Improvevoltage detection functionVSAvoidprimary control circuit board volume

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The voltage detecting circuit is extracted from the primary control circuit board and relocated to the data driving IC. This extraction removes the unnecessary circuitry from the primary control circuit board, reducing its volume and simplifying the overall system configuration.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If a separate voltage detecting circuit is used, then the voltage detection function is achieved, but additional conducting leads are required on the FPCB

Engineering Contradiction:

Improvevoltage detection capabilityVSAvoidFPCB configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The voltage detecting circuit and data driving IC are merged into a single device, which eliminates the need for separate conducting leads on the FPCB for transmitting the all-scanning signal. The FPCB configuration is simplified as the voltage detection function is now integrated with the data driving function.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7746301B2Driving circuit having voltage detecting circuit and liquid crystal display using same

Publication Date: 2010.06.29 RED OAK INNOVATIONS LTD

AI summary

An exemplary liquid crystal display (LCD) (20) includes: a gate driving integrated circuit (IC) (22) for scanning an LCD panel (24) of the LCD; a data driving IC (23) for providing a plurality of gradation voltages to the LCD panel; a primary control circuit board (21) configured for providing the operation voltage to the data driving IC; and a flexible printed circuit board (25) connected between the LCD panel and the primary control circuit board. The data driving IC includes a voltage detecting circuit (230), which detects an operation voltage applied to the gate driving IC and is configured to provide an all-scanning signal to the gate driving IC.