Source Driver Bus Link Simplification for Display Panels

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Solution Overview

Problem

Conventional display panel driving apparatuses require complex bus links between timing controllers and source drivers, leading to increased circuit area and power consumption due to the need for transmission and reception circuits, as well as delay locked loops for clock signal reproduction.

Innovation Solution

The proposed solution involves altering the bus link structure by using a point-to-point connection for direct signal transmission from the timing controller to source drivers and a serial cascade connection for reference signal transmission between source drivers, eliminating the need for transmission circuits and delay locked loops in each source driver.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional bus link structure is used where timing controller transmits signals through cascaded source drivers, then all source drivers can be controlled, but the circuit area and power consumption increase due to required transmission circuits, reception circuits, and delay locked loops in each source driver

Engineering Contradiction:
Improvesignal transmission reliabilityVSAvoidsource driver circuit complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the transmission circuit and delay locked loop functions from individual source drivers. Instead of each source driver having its own transmission circuit and DLL, the timing controller directly transmits data signals to all source drivers, and only the first source driver receives the clock signal and generates sub-clock signals. This extraction eliminates redundant circuits in each source driver, reducing complexity while maintaining reliable signal transmission to all drivers.

Inventive Principle:
Principle #2Taking out (Extraction)

2Measurement precision

If transmission circuits and delay locked loops are added to each source driver for proper signal reception and clock reproduction, then signal transmission accuracy is improved, but power consumption increases

Engineering Contradiction:
Improvesignal reception accuracyVSAvoidsource driver power consumption
Core Design Contradiction:
Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent merges the clock signal distribution function into the timing controller. The timing controller directly provides clock signals to the first source driver, which then generates sub-clock signals for other source drivers. This merging eliminates the need for individual delay locked loops in each source driver, significantly reducing power consumption while maintaining signal reception accuracy through the centralized clock management system.

Inventive Principle:
Principle #5Merging (Combining)

3Reliability

If each source driver has complete transmission and reception circuits for cascaded signal transmission, then signal integrity is maintained, but the area of source drivers increases

Engineering Contradiction:
Improvesignal integrityVSAvoidsource driver area
Core Design Contradiction:
ReliabilityVSArea of moving object

Solution Approach 1:

The patent segments the signal transmission function between the timing controller and source drivers. The timing controller handles direct data signal transmission to all source drivers, while source drivers only need reception circuits for data signals and interconnection circuits for reference signals. This segmentation eliminates the need for transmission circuits in source drivers, reducing their area while maintaining signal integrity through the dedicated timing controller transmission path.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS8300033B2Method and apparatus for driving display panel
Publication Date: 2012.10.30 SAMSUNG ELECTRONICS CO LTD
  • US8300033B2 patent drawing
  • US8300033B2 patent drawing
  • US8300033B2 patent drawing

AI summary

A method and apparatus for driving a display panel in which a bus link between a timing controller and a source driver block is altered in order to simplify the structure of a circuit. The apparatus includes a timing controller to generate signals including data and a reference signal for driving the display panel at a display driving time. A plurality of source drivers generate signals for driving data lines of the display panel using the signals generated by the timing controller. First signal transmission means are provided for transmitting the data from the timing controller to each of the plurality of source drivers using a point-to-point connection link, and a bus for transmitting the reference signal generated by the timing controller to one of the plurality of source drivers. Also, second signal transmission means are provided for transmitting the reference signal between the plurality of source drivers using a serial cascade connection link.