Display Driver Output Switching via Shift Pulse Signal

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing display drivers require an output number control terminal and associated devices and wiring, which increases costs and prevents the narrowing of non-displayed areas around liquid crystal panels.

Innovation Solution

A driver system that includes output portions synchronized with shift pulse signals, allowing for switching between different output specifications without the need for an output number control terminal, using a shift pulse signal to select the appropriate output group and load display data for grayscale voltage output.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an output number control terminal is provided on the chip to enable switching of output numbers, then the driver can switch between different output specifications, but additional devices and wiring are required which increases costs and prevents narrowing of the non-displayed area frame

Engineering Contradiction:

Improveoutput number switching capabilityVSAvoidadditional devices and wiring

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the output number control function from a separate control terminal and integrates it into the shift pulse signal input. By removing the dedicated output number control terminal and its associated control logic, the system achieves output switching capability without requiring additional external devices and wiring, thus reducing device complexity while maintaining adaptability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the output number control function with the existing shift pulse signal input. The shift pulse signal now serves dual purposes: controlling the data shift operation and determining the output number based on its specification. This consolidation eliminates the need for separate control terminals and reduces wiring requirements.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If an output number control terminal is provided on the chip to enable switching of output numbers, then the driver can switch between different output specifications, but the frame of non-displayed area portion on the periphery cannot be narrowed

Engineering Contradiction:

Improveoutput number switching capabilityVSAvoidnon-displayed area frame width

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

By removing the output number control terminal from the chip perimeter, the patent eliminates the need for external wiring connections that would occupy space in the non-displayed area frame. This extraction allows for a narrower bezel and more compact overall device layout.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If an output number control terminal is provided on the chip to enable switching of output numbers, then the driver can switch between different output specifications, but costs are required for mounting and wiring additional devices

Engineering Contradiction:

Improveoutput number switching capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent removes the output number control terminal and its associated external control devices, eliminating the need for mounting these additional components. This reduction in component count directly lowers manufacturing costs while preserving the output switching functionality through the integrated shift pulse signal approach.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The shift pulse signal input is designed to serve multiple functions: controlling data shifting and determining output number. This multi-functionality eliminates the need for dedicated control terminals and external devices, reducing both component count and manufacturing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8310430B2Display device and display driver with output switching control

Publication Date: 2012.11.13 RENESAS ELECTRONICS CORP

AI summary

A driver includes a plurality of output portions; and an output switching control portion. The plurality of output portions is synchronized with a shift pulse signal. The shift pulse signal indicates one specification shift pulse signal among a plurality of specification shift pulse signals. The plurality of specification shift pulse signals indicates a plurality of output numbers which are different from each other based on respective specifications of the plurality of specification shift pulse signals. The one specification shift pulse signal indicates a setting output number as one output number among the plurality of output numbers. The output switching control portion selects a group of output portions corresponding to the setting output number among the plurality of output portions based on the one specification shift pulse signal. The group of output portions loads display data in synchronization with the shift pulse signal, and outputs output grayscale voltages corresponding to the display data to a display portion.