Display Driving Circuit Half-VDD Power Supply Integration

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Solution Overview

Problem

The existing display driving circuits for liquid crystal displays face challenges in miniaturization and increased production costs due to the need for an external power supply circuit to provide the half voltage H-VDD, which increases current consumption and degrades reliability.

Innovation Solution

Incorporating a half-voltage VDD power supply circuit within the display driving circuit to generate and supply the required half voltage H-VDD internally, eliminating the need for an external power supply circuit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an external power supply circuit is used to provide half voltage H-VDD, then the buffer can be operated with proper voltage levels, but the system size increases and production costs increase

Engineering Contradiction:

Improvebuffer operation reliabilityVSAvoidsystem size

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent merges the half voltage generation function into the existing power supply circuit by adding a voltage division network (resistors R1 and R2) that generates H-VDD from the existing VDD and VSS rails. This eliminates the need for a separate external half voltage power supply circuit, thereby reducing system size while maintaining reliable buffer operation through proper voltage level provisioning.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The power supply circuit is enhanced to perform multiple functions: it not only supplies the main voltage rails (VDD and VSS) but also generates the half voltage (H-VDD) through an integrated voltage division network. This multi-functional approach eliminates the need for dedicated external half voltage supply circuitry, reducing overall system complexity and size.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If an external power supply circuit is used to provide half voltage H-VDD, then the buffer can be operated with proper voltage levels, but production costs increase

Engineering Contradiction:

Improvebuffer operation reliabilityVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines the half voltage generation function with the existing power supply circuit using a voltage division network (resistors R1 and R2). This integration eliminates the need for separate external components and circuitry, thereby reducing component count, assembly complexity, and production costs while ensuring reliable buffer operation through stable voltage levels.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The enhanced power supply circuit performs multiple functions including supplying main voltage rails (VDD, VSS) and generating half voltage (H-VDD) through integrated voltage division. This multi-functionality reduces the need for additional external components, simplifying manufacturing and reducing production costs while maintaining operational reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the half voltage H-VDD is supplied from outside the display driving circuit, then the buffer can be operated, but current consumption increases

Engineering Contradiction:

Improvebuffer operationVSAvoidcurrent consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent integrates the half voltage generation function into the existing power supply circuit using a voltage division network (resistors R1 and R2). This internal generation approach eliminates the need for separate external half voltage supply circuitry, reducing overall system current consumption while maintaining reliable buffer operation through stable voltage levels.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If the half voltage H-VDD is supplied from outside the display driving circuit, then the buffer can be operated, but the system requires additional external components

Engineering Contradiction:

Improvebuffer operationVSAvoidpower supply circuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the half voltage generation function into the existing power supply circuit by adding a voltage division network (resistors R1 and R2). This integration eliminates the need for separate external half voltage power supply circuitry, thereby reducing device complexity and the number of external components required, while maintaining reliable buffer operation.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8803859B2Display driving circuit having half VDD power supply circuit built therein and display driving system including the same

Publication Date: 2014.08.12 SILICON WORKS CO LTD

AI summary

The present invention relates to a display driving circuit and a display driving system, and more particularly, to a display driving circuit having a half-VDD power supply circuit built therein and a display driving system including the same, in which the display driving circuit is further provided with a half voltage VDD terminal in addition to the highest voltage VDD terminal and the lowest voltage VSS terminal, and the half voltage, which is between the highest voltage and the lowest voltage, is generated and supplied by the half voltage power supply from the inside of the display driving circuit, rather than being supplied from an external power supply.