Sony LCX028AMT Datasheet

LCX028AMT

4.6cm (1.8-inch) Black-and-White LCD Panel

Description

The LCX028AMT is a 4.6cm diagonal active matrix
TFT-LCD panel addressed by polycrystalline silicon
super thin film transistors with a built-in peripheral
driving circuit. Use of three LCX028AMT panels
provides a full-color representation. The striped
arrangement suitable for data projectors is capable
of displaying fine text and vertical lines.

The adoption of an advanced on-chip black matrix
realizes a high luminance screen. And cross talk free
circuit and ghost free circuit contribute to high
picture quality.

This panel has a polysilicon TFT high-speed
scanner and built-in function to display images
up/down and/or right/left inverse. The built-in 5V
interface circuit leads to lower voltage of timing and
control signals.

The panel contains an active area variable circuit
which supports 4:3 and 16:9 data signals by changing
the active area according to the type of input signal.

Features

• Number of active dots: 1,310,720 (1.8-inch, 4.6cm in diagonal)

• 4:3 and 16:9 aspect-ratio switching function

4:3 (1280 (H) × 960 (V))

16:9 (1280 (H) × 720 (V))

• High optical transmittance: 27% (typ.)

• Built-in cross talk free circuit and ghost free circuit

• High contrast ratio with normally white mode: 250 (typ.)

• Built-in H and V drivers (built-in input level conversion circuit, 5V driving possible)

• Up/down and/or right/left inverse display function

• Antidust glass package

• Microlens used

Element Structure

• Dots: 1280 (H) × 1024 (V) = 1,310,720

• Built-in peripheral driver using polycrystalline silicon super thin film transistors

Applications

• Liquid crystal data projectors

• Liquid crystal multimedia projectors

• Liquid crystal rear-projector TVs, etc.

– 1 –

E99230-PS

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

∗

The company's name and product's name in this data sheet is a trademark or a registered trademark of each company.

– 2 –

LCX028AMT

18

COM

VSIG6

VSIG5

VSIG4

VSIG3

VSIG2

VSIG1

Vss

VV

DD

HV

DD

ENB

DWN

PCG

VCK

VST

RGT

BLK

HCK2

HCK1

HST

V

SS

G

PSIG

17

20

19

22

23

16

2

24

VB1

VB2

25

29

26

28

15

30

27

COMR

9

12

11

10

8

7

4

3

5

13

6

14

VSIG7

VSIG8

VSIG9

VSIG10

VSIG11

VSIG12

1

21

COML

32

H Shift Register (Bidirectional Scanning)

Up/Down and/or Right/Left

Inversion Control Circuit

V Shift Register

(Bidirectional Scanning)

Precharge Control

Circuit

COM
PAD

V Shift Register

(Bidirectional Scanning)

Black Frame Control Circuit

Black Frame Control Circuit

Input Signal
Level Shifter
Circuit

31

Block Diagram

– 3 –

LCX028AMT

Absolute Maximum Ratings (VSS = 0V)

• H driver supply voltage HVDD –1.0 to +20 V

• V driver supply voltage VVDD –1.0 to +20 V

• Common pad voltage COM, COML, COMR –1.0 to +17 V

• H shift register input pin voltage HST, HCK1, HCK2, –1.0 to +17 V

RGT

• V shift register input pin voltage VST, VCK, PCG, –1.0 to +17 V
BLK, ENB, DWN
VB1, VB2

• Video signal input pin voltage SIG1 to 12, PSIG –1.0 to +15 V

• Operating temperature

∗

Topr –10 to +70 °C

• Storage temperature Tstg –30 to +85 °C

∗

Panel temperature inside the antidust glass

Operating Conditions (VSS = 0V)

• Supply voltage

HVDD 15.5 ± 0.5V
VVDD 15.5 ± 0.5V

• Input pulse voltage (Vp-p of all input pins except video signal and uniformity improvement signal input pins)

– 4 –

LCX028AMT

Pin Description

Pin
No.

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

PSIG
COMR
VSIG1
VSIG2
VSIG3
VSIG4
VSIG5
VSIG6
VSIG7
VSIG8
VSIG9
VSIG10
VSIG11
VSIG12
HVDD
RGT
HST
HCK1
HCK2
VSS
COML
BLK
ENB
VCK
VST
DWN
VB1
VB2
PCG
VVDD
VSSG
COM

Symbol Description

Uniformity improvement signal
Voltage for right CS (storage capacity) electrode line
Video signal 1 to panel
Video signal 2 to panel
Video signal 3 to panel
Video signal 4 to panel
Video signal 5 to panel
Video signal 6 to panel
Video signal 7 to panel
Video signal 8 to panel
Video signal 9 to panel
Video signal 10 to panel
Video signal 11 to panel
Video signal 12 to panel
Power supply for H driver
Drive direction pulse for H shift register (H: nomal, L: reverse)
Start pulse for H shift register drive
Clock pulse for H shift register drive 1
Clock pulse for H shift register drive 2
GND (H, V drivers)
Voltage for left CS (storage capacity) electrode line
Black Frame display pulse
Enable pulse for gate selection
Clock pulse for V shift register drive
Start pulse for V shift register drive
Drive direction pulse for V shift register (H: nomal, L: reverse)
Display area switching 1
Display area switching 2
Improvement pulse for uniformity
Power supply for V driver
GND for V gate
Common voltage of panel

– 5 –

LCX028AMT

Input Equivalent Circuit

To prevent static charges, protective diodes are provided for each pin except the power supplies. In addition,
protective resistors are added to all pins except the video signal inputs. All pins are connected to VSS with a
high resistor of 1MΩ (typ.). The equivalent circuit of each input pin is shown below: (Resistance value: typ.)

Input

LC

Level conversion circuit

(single-phase input)

2.5kΩ2.5kΩ

VV

DD

Input

Level conversion circuit

(single-phase input)

250Ω250Ω

HV

DD

Input

Level conversion circuit

(single-phase input)

2.5kΩ2.5kΩ

HV

DD

Input

HV

DD

250Ω

250Ω

250Ω

250Ω

Level conversion circuit

(2-phase input)

Input

HV

DD

Signal line

(1) VSIG1 to VSIG12, PSIG

(2) HCK1, HCK2

(3) RGT

(4) HST

(5) PCG, VCK

(6) VST, BLK, ENB, DWN, VB1, VB2

(7) COM, COML, COMR

1MΩ

Input

1MΩ

1MΩ

1MΩ

Level conversion circuit

(single-phase input)

250Ω250Ω

VV

DD

Input

1MΩ

1MΩ

1MΩ

VVDD

1MΩ

Input

1MΩ

(8) HVDD, VSSG, VVDD

are all Vss.

Level conversion circuit

(2-phase input)

– 6 –

LCX028AMT

Input Signals

1. Input signal voltage conditions (VSS = 0V)

Item

H shift register input voltage
HST, HCK1, HCK2, RGT

(Low)
(High)

(Low)

(High)

VHIL
VHIH

VVIL

VVIH
VVC

Vsig
Vcom
VpsigB
VpsigG

–0.5

4.5

–0.5

4.5

6.9
VVC – 4.5
VVC – 0.6
VVC ± 4.4
VVC ± 1.7

0.0

5.0

0.0

5.0

7.0

7.0
VVC – 0.5
VVC ± 4.5
VVC ± 1.8

0.4

5.5

0.4

5.5

7.1
VVC + 4.5
VVC – 0.4
VVC ± 4.6
VVC ± 1.9

V
V

V

V
V

V
V

V

V shift register input voltage
VB1, VB2, BLK, VST,
VCK, PCG, ENB, DWN

Video signal center voltage
Video signal input range

∗1

Common voltage of panel

∗2

Uniformity improvement signal
input voltage (PSIG)

∗3

Symbol Min. Typ. Max. Unit

∗1

Input video signal shall be symmetrical to VVC.

∗2

The typical value of the common pad voltage may lower its suitable voltage according to the set
construction to use. In this case, use the voltage of which has maximum contrast as typical value.
When the typical value is lowered, the maximum and minimum values may lower.

∗3

Input a uniformity improvement signal PSIG in the same polarity with video signals VSIG1 to VSIG12 and
which is symmetrical to VVC. PSIG wave form is 2 steps like below, in the upper chart, upper shows signal
level of the 1st step, lower shows signal level of the 2nd step. Also, the rising and falling of PSIG are
synchronized with the rising of PCG pulse, and the rise time trPSIG and fall time tfPSIG are suppressed
within 400ns (as shown in a diagram below).

Level Conversion Circuit

The LCX028AMT has a built-in level conversion circuit in the clock input unit on the panel. The input signal
level increases to HVDD or VVDD. The VCC of external ICs are applicable to 5 ± 0.5V.

trPSIG
tfPSIG

VVC

PSIG

PCG

90%

10%

PRG

∗

4

PsigG

PsigB

Input waveform of uniformity improvement signal PSIG

∗4

PRG shows the time of the 1st step of PSIG signal, and it is not input to the panel.

– 7 –

LCX028AMT

2. Clock timing conditions (Ta = 25°C) (SXGA mode: fHckn = 4.5MHz, fVck = 32.0kHz, fv = 60Hz)

∗5

Hckn means Hck1 and Hck2.

∗6

The minimum value of tdEnb is 450ns. When H-BLK has a long cycle and has some time to spare, take
more time prior to other value.

∗7

Blk is the timing during 4:3 and 16:9 aspect-ratio mode, which keeps "H" level in other modes.

Hst rise time
Hst fall time
Hst data set-up time
Hst data hold time
Hckn rise time

∗5

Hckn fall time

∗5

Hck1 fall to Hck2 rise time
Hck1 rise to Hck2 fall time
Vst rise time
Vst fall time
Vst data set-up time
Vst data hold time
Vck rise time
Vck fall time
Enb rise time
Enb fall time
Horizontal video period completed to Enb fall time
Enb rise to horizontal video period started
Enb fall to Pcg rise time
Enb pulse width
Pcg rise time
Pcg fall time
Pcg rise to Vck rise/fall time
Pcg fall to horizontal video period start time
Pcg pulse width
PRG∗4rise to Pcg rise time
PRG∗4fall to Pcg fall time
PRG∗4pulse width
Blk rise time
Blk fall time
Blk rise to Enb fall time
Blk fall to Pcg rise time

trHst
tfHst
tdHst
thHst
trHckn
tfHckn
to1Hck
to2Hck
trVst
tfVst
tdVst

thVst
trVck
tfVck
trEnb
tfEnb
tdEnb
toPRG

∗4

toPcg
twEnb
trPcg
tfPcg
toVck
toVideo
twPcg
toPcgr
toPcgf
twPRG

∗4

trBlk
tfBlk
toEnb
toPcg

—
—
35
35
—

—
–15
–15

—

—

2

2
—
—
—
—

450

∗6

800
750

1800

—
—

–100

200

1600

–10
400

1100

—
—

2
–1

—
—
45
45
—
—

0

0
—
—

6

6
—
—
—
—

700
1100
1000

—
—
—

0

270
1800

0

600
1200

—
—

1
0

30
30
55
55
30
30
15

15
100
100

10

10
100
100
100
100

—

—

—

—

30

30
100

—

—

10

—

—
100
100

0
1

ns

µs

ns

Item Symbol Min. Typ. Max. Unit

HST

HCK

VST

VCK

ENB

PCG

BLK

∗5

PRG

∗4

µs

– 8 –

LCX028AMT

∗8

Definitions: The right-pointing arrow ( ) means +.
The left-pointing arrow ( ) means –.
The black dot at an arrow ( ) indicates the start of measurement.

<Horizontal Shift Register Driving Waveform>

Hst rise time

HST

HCK

Hst fall time

Hst data set-up time

Hst data hold time

Hckn rise time

∗5

Hckn fall time

∗5

Hck1 fall to Hck2 rise time

Hck1 rise to Hck2 fall time

• Hckn

∗5

duty cycle 50%
to1Hck = 0ns
to2Hck = 0ns

• Hckn

∗5

duty cycle 50%
to1Hck = 0ns
to2Hck = 0ns

• Hckn

∗5

duty cycle 50%
to1Hck = 0ns
to2Hck = 0ns

trHst

tfHst

tdHst

thHst

trHckn

tfHckn

to1Hck

to2Hck

Item Symbol Waveform Conditions

90%

10%

10%

90%

Hst

trHst tfHst

50%

50%

∗

8

Hst

Hck1

tdHst thHst

50%

50%

∗

5

Hckn

10%

10%

90%

90%

trHckn tfHckn

50%

50%

∗

8

Hck1

to2Hck to1Hck

50%

50%

Hck2