Display Driver Serial Timing Signal Generation

Solution Overview

Problem

Conventional CPU interface methods for liquid crystal display devices require generating a timing signal within a driver IC using an oscillator, which hinders the reduction in size of the circuit and increases power consumption, especially when writing image data into pixels.

Innovation Solution

A display device with a display driver that extracts flags from serial data transmitted via serial transmission to generate timing signals for writing image data into pixels, eliminating the need for an oscillator and allowing direct control of the timing signal generation within the driver IC.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an oscillator is used to generate timing signals within the driver IC, then the timing signal generation is stable and reliable, but the circuit size increases and power consumption increases

Engineering Contradiction:

Improvetiming signal generation stabilityVSAvoidcircuit size

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the timing signal generation function from the driver IC by utilizing the first flag from serial data transmission. Instead of generating timing signals internally using an oscillator, the system extracts timing information from the external serial data stream, removing the need for internal oscillation circuits and reducing device complexity while maintaining reliable timing control.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The serial data transmission line is given multiple functions: it not only transmits image data but also provides timing signal information through the first flag. This multi-functionality eliminates the need for separate timing signal generation circuits, reducing both circuit size and power consumption while maintaining reliable timing control for image data writing.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If an oscillator is used to generate timing signals within the driver IC, then the timing signal generation is stable and reliable, but the power consumption increases

Engineering Contradiction:

Improvetiming signal generation stabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts the timing signal generation function from the driver IC by utilizing the first flag from serial data transmission. Instead of generating timing signals internally using an oscillator, the system extracts timing information from the external serial data stream, removing the need for internal oscillation circuits and reducing power consumption while maintaining reliable timing control.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The serial data transmission line is given multiple functions: it not only transmits image data but also provides timing signal information through the first flag. This multi-functionality eliminates the need for separate timing signal generation circuits, reducing both circuit size and power consumption while maintaining reliable timing control.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Area of stationary object

If serial transmission is used for image data, then the number of signal lines is reduced and space is saved, but the timing control complexity increases

Engineering Contradiction:

Improvewiring spaceVSAvoidtiming control complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The serial data transmission line is given multiple functions: it not only transmits image data but also provides timing signal information through the first flag. This multi-functionality eliminates the need for separate timing control circuits, reducing timing control complexity while maintaining the space-saving advantages of serial transmission.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent extracts the timing signal generation function from the driver IC by utilizing the first flag from serial data transmission. Instead of generating timing signals internally using an oscillator, the system extracts timing information from the external serial data stream, removing the need for internal oscillation circuits and reducing device complexity while maintaining reliable timing control.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8692758B2Display device and mobile terminal using serial data transmission

Publication Date: 2014.04.08 SHARP KK

AI summary

A display device of an embodiment of the present invention is a display device of an active matrix type, and includes a display driver supplied with image data included in serial data by serial transmission. The serial data has a first flag for specifying a polarity of voltage of a common electrode added thereto. The display driver generates, in accordance with a timing of a serial clock, a timing signal for a horizontal period for a data signal line driver, and a timing signal for a gate signal line driver. This realizes a display device capable of easily generating, within a driver IC, a timing signal for writing the image data in pixels.