LP156WF4 datasheet(33/39 Pages) LG

33 / 39 page

Product Specification

LP156WF4

Liquid Crystal Display

Ver. 1.1

Apr. 17, 2014

HPD Signal recognition

Define

1. Hot Plug Detection (HPD) Threshold level of Source Device is minimum 2.0V

2. HPD Unplug : HPD pulse stays low longer than 2ms.

DP Tx shall wait for HPD signal to go high again.

3. “HPD High” is confirmed only after HPD has been asserted continuously for 100msec.

IRQ (Interrupt Request) HPD Pulse Definition

Define

Upon detection this “HPD IRQ Event”(0.5ms ~ 1ms) ,the source device must read the

link / sink status field of the DPCD and take corrective action.

APPENDIX B. LGD Proposal for eDP Interface Design Guide

[ Abnormal Communication By HPD Glitch ]

LCDVCC

HPD

AUX

0~200ms

Abnormal AUX communication by system HPD glitch recognition

HPD Glitch

Hot Plug Event

 No AUX communication

[ Normal Communication By HPD Signal ]

LCDVCC

HPD

AUX

0~200ms

Normal AUX communication by system HPD recognition

HPD Glitch

Hot Plug Event

 AUX communication

Min 2.0V

LCDVCC

HPD

AUX

Main link

Link

training

Normal

Video stream

Abnormal Status

Link disconnect

HPD_IRQ by link disconnecting

0.5ms ~ 1.0ms

Link

training

Normal

Video stream

RX link status check &

Re-link training

Ex) HPD Pulse

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