Liquid crystal display apparatus

60 Pages·2013·2.66 MB·English

US 20050184952A1
(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2005/0184952 A1
Konno et al. (43) Pub. Date: Aug. 25, 2005
(54) LIQUID CRYSTAL DISPLAY APPARATUS Publication Classi?cation
(76) Inventors: Akitoyo Konno, Hitachi (JP); Masaya (51) Int. Cl? ..................................................... ..G09G 3/36
Adachi, Hitachi (JP); Daisuke Kajita, (52) Us. 01. ............................................................ ..345/102
Hitachi (JP); Tsunenori Yamamoto,
Hitachi (JP); Katsumi Kondo, Mito
(57) ABSTRACT
(JP); Tatsuki Inuzuka, Mito (JP); Ikuo
Hiyama, Hitachinaka (JP); Yuka
The video display apparatus has a light modulation device
Utsumi, Hitachi (JP)
for forming a picture in accordance With a video signal and
a lighting unit for irradiating, on the light modulation device,
Correspondence Address:
illumination light necessary to cause it to display the picture.
ANTONELLI, TERRY, STOUT & KRAUS,
In the apparatus, the lighting unit irradiates the illumination
LLP
light in sequence of individual plural illumination light
1300 NORTH SEVENTEENTH STREET
source partitive areas, a luminance distribution calculating
SUITE 1800
unit calculates luminance distributions of video signals
ARLINGTON, VA 22209-3873 (US)
corresponding to the plural partitive areas to determine
(21) APPL NO: 11/053 029 illumination light luminance levels of the individual parti
’ tive areas, an illumination controller controls rays of the
(22) Filed; Feb 9, 2005 illumination light of individual areas of the lighting unit on
the basis of determination by the luminance distribution
(30) Foreign Application Priority Data calculating unit, and a video corrector corrects the video
signal inputted to the light modulation device on the basis of
Feb. 9, 2004 (JP) .................................... .. 2004-031883 the determination by the luminance distribution calculating
Dec. 20, 2004 (JP) .................................... .. 2004-366988 unit.
6g0
VIDEO
30 50 CORRECTION
( ( MEANS
VIDEO BRILLIANCE
a SIGNAL _) DISTRIBUTION 8Q
PROCESSING CALCULATING (
MEANS MEANS
BACKLIGHT
CONTROL
MEANS
Patent Application Publication Aug. 25, 2005 Sheet 1 0f 40 US 2005/0184952 A1
FIG. 1
cd10
BRILLIANCE | OII I I0 1010 I IOIOO
0.01 .
cd/m2 I I I I I I
cd20
I REQUIRED DISPLAY BRILLIANCE RANGE (cR;10000)I J
F I
cd30
110 EXISTING LCD (cR;500)I 5J0‘)
I BL RELATIVE LUMINANCE 1 l
01 I’ Cd4g0 I
|' BL RELATIVE LUMINANCE (0.1)I I ‘I
F I i
LUMINANCE OF 2 0 I Cd5£I000
BACKLIGHT (BL) I‘ BL RELATIVE LUMINANCE (2)8 J
IS CONTROLLED
I
IN ACCORDANCE
WITH PICTURE
Cd60
I
I ACTUAL DISPLAY BRILLIANCE RANGE (CRZ‘IOOOO) A]
F I I
Patent Application Publication Aug. 25, 2005 Sheet 2 0f 40 US 2005/0184952 A1
FIG. 2
@104 1OUTGOING LIGHT
10-6’\
POLARIZING
PLATE
10-4,»
TRANSPARENT
SUBSTRATE
10 3 LIQUID CRYSTAL
d MOLECULE
ELECTRIC FIELD 10-20
PIXEL ELECTRODE 10-28
10-2d COMMON
10-2N ------ O TI 11 O 2
TRANSPARENT
SUBSTRATE
10-1 J
POLARIZING
PLATE
INCIDENT LIGHT
Patent Application Publication Aug. 25, 2005 Sheet 3 0f 40 US 2005/0184952 A1
FIG. 3
60
I
VIDEO N
3&0 5S0 CORMREEACNTSI O
VIDEO BRILLIANCE
__> SIGNAL _>DISTRIBUTION 8O
PROCESSING CALCULATING I
MEANS MEANS
BACKLIGHT
CONTROL
MEANS
FIG. 4
///§/// /
1
1
areaO I area1
|
Patent Application Publication Aug. 25, 2005 Sheet 4 0f 40 US 2005/0184952 A1
areaO area1
FIG. 5A SIGNAL
BACKLIGHT
LUMINANCE
FIG. 5C OUTPUT
PICTURE
a m a 0 a m m
_E_....l__|| 666 VAC EAOEUVRSOm RRImmRmLM8 L CE NNII TGOAGAN ||N m_w Nm .0 ZZOOmFOF<Z<Q<DZ<<=M2E®DO | _
mBWLO H|Xv_
EL
wozijim
FIG- 60 3%
Patent Application Publication Aug. 25, 2005 Sheet 5 0f 40 US 2005/0184952 A1
FIG. 7
500 Bo=KoGr
450
400
NE 350
'8 areaO
LU 300 ——--area1
% 250
_ = r
25 150
100
50 ,,
O _,
0 50 100 150 200 250
GRADATION G0 G1
ORlGlNAL z areaO area1
. VIDEO 9 i
SIGNAL 2 :
D. E
E _|—_—|_=_____
‘9 :
- 8 VAIFDTEEOR SIGNAL2Z '
CORRECTION g _| |_
é i
o l
BACKLIGHT Lu X i
. LUMINANCE <23 :
<z1 l
E
3 .
FIG. 8D BILéETJLQE
BRILLIANCE
Patent Application Publication Aug. 25, 2005 Sheet 6 0f 40 US 2005/0184952 A1
areaO area1
FIG. 9A .~
SIGNAL
FI
GIRADATION
S U lTl O (2 D Z >
FIG. 9B F 2
CORRECTION _l—”LJ/__
FIG. 9C FWETE
GBLRURIMLIALNIDAANNACCEE
FIG. 9D EILéTrTJ‘éTE
FIG. 10
llll\llljf////
7
VIDEO SIGNAL %lllll\ll/%/f
areaO area1
%
Patent Application Publication Aug. 25, 2005 Sheet 7 0f 40 US 2005/0184952 A1
FIG. 11A
8000
7000M
6000
\.
cL/UdMImNA-N2CE
5000
4000
3000
2000
1000
40 60 80 100
POSITION / mm
FIG. 115
W
0.95
LNUOMRIMNAALNIZCEED a. o ACTUALLY MEASURED VALUES
0.9
—— APPROXIMATE CURVE
0.85
0.8
0.75
0.7
0.65 "M»
0.6
—1 30 -65 0 65 130
POSITION/PIXEL
Patent Application Publication Aug. 25, 2005 Sheet 8 0f 40 US 2005/0184952 A1
FIG. 12
9,0
I """"""""""""""""""""""""""" ' ' I """ ‘I
I I
I 30 I
l I
: VIDEO SIGNAL :
; PROCESSING \
I MEANS “S5 I
I 86 I
: ’\~S1 0 i
I 40 50 I
a @iBREISLILiIRAINIC?ES a
I MEANS I
I sbéO I
l l
Li 520/“ ‘ i i f4 $l 40 II
; ?so 70 8O :
I VIDEO BACKLIGHT I
; CORRECTION CORRECTlON CONTROL I
: MEANS S MEMORY MEANS :
i I
l |
L _ _ _ _ _ _ _ _ _ _ _ _._ _ _ _ _ _ _ _ _ _4
DECIDED
12
DGRAIVTEER DRRIOVEWR . DW__ _-_ __ m
LCD PANEL 22 g 1:") LED PANEL :lj
- [j[-n--n--H--[U ~20
UUIIJIIIEIEI 25
$150
s’IOO
Patent Application Publication Aug. 25, 2005 Sheet 9 0f 40 US 2005/0184952 A1
FIG. 13
Y /d90p1
SEARCH VIDEO SIGNAL
(MAXIMUM VALUE - MINI
MUM VALUE) IN RESPECT
OF INDIVIDUAL AREAS
DETERMINE LUMINANCE
LEVELS IN RESPECT OF
INDIVIDUAL AREAS
CALCULATE BACKLIGHT
LUMINANCE DISTRIBUTION
BETWEEN AREAS
/~90p5 /~90p4
CONTROL BACKLIGHT CORRECT VIDEO SIGNAL
L