Product Specification

LP156WF4

Liquid Crystal Display

Ver. 1.1

Apr. 17, 2014

3-3-5. eDP HPD Signal

Parameter

Symbol

Min

Typ

Max

Unit

Notes

HPD Voltage

HPD

2.25

-

3.6

V

Sink side Driving

Hot Plug Detection Threshold

2.0

-

-

V

Source side Detecting

Hot Unplug Detection Threshold

-

-

0.8

V

HPD_IRQ Pulse Width

HPD_IRQ

0.5

-

1.0

ms

HPD_TimeOut

2.0

-

-

ms

HPD Unplug Event

[ HPD Events ]

HPD_TimeOut (2ms)

HPD_IRQ Pulse

(0.5 ~ 1.0ms)

HPD

Case1 : HPD IRQ Event

Case2 : Hot Unplug Event

Case3 : Hot Plug / Re-plug Event

Note)

1. HPD IRQ : Sink device wants to notify the Source device that Sink‟s status has changed so it toggles HPD line,

forcing the Source device to read its Link / Sink Receiver DPCD field via the AUX-CH

2. HPD Unplug : The Sink device is no longer attached to the Source device and the Source device may then disable its

Main Link as a power saving mode

3. Plug / Re-plug : The Sink device is now attached to the Source device, forcing the Source device to read its Receiver

capabilities and Link / Sink status Receiver DPCD fields via the AUX-CH

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