LG Electronics 55LA970V/W/9-ZA White Balance Adjustment, Adj. condition and cautionary items

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4.2. White Balance Adjustment

4.2.1. Overview

▪W/B adj. Objective & How-it-works

(1)Objective: To reduce each Panel's W/B deviation

(2)How-it-works : When R/G/B gain in the OSD is at 192, it means the panel is at its Full Dynamic Range. In order to prevent saturation of Full Dynamic range and data, one of R/G/B is fixed at 192, and the other two is lowered to find the desired value.

(3)Adjustment condition : normal temperature

1)Surrounding Temperature : 25 °C ± 5 °C

2)Warm-up time: About 5 Min

3)Surrounding Humidity : 20 % ~ 80 %

4)Before White balance adjustment, Keep power on status, don’t power off

4.2.2. Adj. condition and cautionary items

(1)Lighting condition in surrounding area surrounding lighting should be lower 10 lux. Try to isolate adj. area into dark surrounding.

(2)Probe location: Color Analyzer (CA-210) probe should be within 10cm and perpendicular of the module surface (80°~ 100°)

(3)Aging time

1)After Aging Start, Keep the Power ON status during 5 Minutes.

2)In case of LCD, Back-light on should be checked using no signal or Full-white pattern.

4.2.3. Equipment

(1)Color Analyzer: CA-210 (LED Module : CH 14)

(2)Adjustment Computer(During auto adj., RS-232C protocol is needed)

(3)Adjustment Remote control

(4)Video Signal Generator MSPG-925F 720p/216-Gray

(Model: 217, Pattern: 49)

→Only when internal pattern is not available

▪Color Analyzer Matrix should be calibrated using CS-100.

4.2.4. Equipment connection MAP

		Color Analyzer
Probe		RS -232C
		Computer
	RS -232C	RS -232C
		Pattern Generator
	Signal Source
	* If TV internal pattern is used, not needed

4.2.5. Adj. Command (Protocol)

<Command Format>

START 6E A 50 A LEN A 03 A CMD A 00 A VAL A CS STOP

-LEN: Number of Data Byte to be sent

-CMD: Command

-VAL: FOS Data value

-CS: Checksum of sent data

-A: Acknowledge

Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX]

▪ RS-232C Command used during auto-adjustment.

RS-232C COMMAND			Explantion
[CMD	ID	DATA]
wb	00	00	Begin White Balance adjustment
wb	00	10	Gain adjustment(internal white pattern)
wb	00	1f	Gain adjustment completed
wb	00	20	Offset adjustment(internal white pattern)
wb	00	2f	Offset adjustment completed
wb	00	ff	End White Balance adjustment
			(internal pattern disappears )

Ex) wb 00 00 -> Begin white balance auto-adj. wb 00 10 -> Gain adj.

ja 00 ff -> Adj. data jb 00 c0

...

...

wb 00 1f → Gain adj. completed

*(wb 00 20(Start), wb 00 2f(end)) → Off-set adj. wb 00 ff → End white balance auto-adj.

▪ Adj. Map

	Adj. item	Command		Data Range		Default
		(lower caseASCII)		(Hex.)		(Decimal)
		CMD1	CMD2	MIN	MAX
	R Gain	j	g	00	C0
	G Gain	j	h	00	C0
Cool	B Gain	j	i	00	C0
	R Cut
	G Cut
	B Cut
	R Gain	j	a	00	C0
	G Gain	j	b	00	C0
Medium	B Gain	j	c	00	C0
	R Cut
	G Cut
	B Cut
	R Gain	j	d	00	C0
	G Gain	j	e	00	C0
Warm	B Gain	j	f	00	C0
	R Cut
	G Cut

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