Graphic COG LCD Display

Graphic COG LCD Display

graphic COG LCD display
graphic COG LCD display ADG12864A35
Model No. ADG12864A35
►128x64 COG display
►Graphic LCD

Send Inquiry

Product Details

graphic COG LCD display

graphic COG LCD display ADG12864A35

Model No. ADG12864A35

►128x64 COG display

►Graphic LCD

►Built-in controller NT7538H.

►5V power supply

►1/65 Duty, 1/9 Bias

►Interface : 8080

Description of graphic COG LCD display ADG12864A35

Graphic COG LCD display has a regular array of dots, that can be turned on in any pattern to show any image, letters, numbers, or symbols. Graphic COG LCD display offer the most flexibility, but take more computing power, since every single dot has to be managed.

Graphic COG LCD display is the best solution to assure that you have future flexibility in your user interface design.

1. FEATURES

The features of LCD are as follows

* Display mode : FSTN /GRAY, Positive, Transflective

* Color : Display dot :Black

Background: GRAY

* Display Format : 128Dots × 64Dots graphic

* IC : NT7538H

* Interface Input Data : 8080

* Driving Method : 1/65 Duty, 1/9 Bias

* Viewing Direction : 6 O’clock

* Backlight : LED( WHITE)

2. MECHANICAL SPECIFICATIONS

Item

Specification

Unit

Module Size

80.5(W) X45(H) X5.3max.(T)

mm

Viewing Area

60(W) X 32.6(H)

mm

Effective Display Area

55.02(W) X27.5(H)

mm

Number of Dots

128 X 64 Dots

-

Dot Size

0.41(W) X 0.41(H)

mm

Dot Pitch

0.43(W) X 0.43(H)

mm

3. ELECTRICAL SPECIFICATIONS

3-2-1.Electrical Characteristics

Item

Symbol

Test
Condition

Min.

Typ.

Max.

Unit

Supply Voltage For Logic

VDD – VSS

Ta=25℃

2.7

3.1

3.3

V

Supply Voltage For LCD

V0-VSS

Ta=25℃

8.8

9.0

9.2

V

Input Voltage

“H” Level

V IH

Ta=25℃

0.8VDD

-

VDD

V

“L” Level

V IL

VSS

-

0.2VDD

V

Output Voltage

“H” Level

V OH

IOUT= -0.5mA

0.8VDD

-

VDD

V

“L” Level

V OL

IOUT= 0.5mA

VSS

-

0.2VDD

V

Current Consumption

IDD

VIN = VDD

-

1.6

2.0

mA

NOTE: 1) Duty ratio=1/65, Bias=1/9     2) Measured in Dots ON-state

3-3. BACKLIGHT

3-3-1. Absolute Maximum Ratings

Item

Symbol

Condition

Min.

Typ.

Max

Unit

Forward Current

IF

Ta= 25℃

-

-

60

mA

Reverse Voltage

VR

-

-

5

V

Power Dissipation

PD

Ta= 25℃

-

-

-

mW

3-3-2. Opto-electronic Characteristics

Item

Symbol

Condition

Min.

Typ.

Max

Unit

Forward Voltage

VF

Ta= 25℃
IF= 75MA

2.8

3.3

3.5

V

Luminous

-

-

--

-

cd/m²

* The brightness is measured without LCD panel

4. ELECTRO – OPTICAL CHARACTERISTICS

No

Parameter

Symbol

Temp

Value

Unit

Note

(C)

Min

Typ

Max

1

Driving voltage

Vop

0

9.0

9.2

9.5

V

1

25

8.8

9.0

9.2

50

8.6

8.8

9.0

2

Response time

Tr

0

N/A

298.6.

750

ms

5

25

N/A

96.2

200

Tf

0

N/A

512.5

450

25

N/A

167.5

200

3

Viewing Angle

⊙2-⊙1

25

60

60

N/A

Deg

3.4

30

53

N/A

4

Contrast Ratio

K

25

2.00

2.12

3.25

 

2

5

Frame Frequency

Ff

N/A

32

64

128

Hz

2

5(001).jpg

5. Interface Pin Function

Pin NO.

Symbol

I / O

Functions

1

CS

I

This is the chip select signal. When /CS1=“L” and CS2=“H”,
then the chip select becomes active, and data/command I/O is enabled.

2

RES

I

When /RES is set to “L”, the settings are initialized. The reset operation is performed by the /RES signal level

3

AO

I

This is connected to the least significant bit of the normal MPU address bus, and it determines whether the data bits are data or a command.
A0 = “H”: Indicate that D0 to D7 are display data
A0 = “L”: Indicates that D0 to D7 are control data

4

WR

I

When connected to an 8080 MPU, this is active LOW. This
terminal connects to the 8080 MPU /WR signal. The signals
on the data bus are latched at the rising edge of the /WR
signal.
When connected to a 6800 Series MPU, this is the read/write control signal input terminal.
When R/W = “H”: Read
When R/W = “L”: Write

5

RD

I

When connected to an 8080 MPU, it is active LOW. This pad
is connected to the /RD signal of the 8080MPU, and the
NT7538 data bus is in an output status when this signal is “L”.
When connected to a 6800 Series MPU, this is active HIGH.
This is used as an enable clock input of the 6800 series
MPU

6-13

D0-D7

I/O

This is an 8-bit bi-directional data bus that connects to an 8-bit or 16-bit standard MPU data bus.
When the serial interface is selected (P/S=“L”), then D7 serves as the serial data input terminal (SI) and D6 serves as the serial clock input terminal (SCL). When the serial interface is selected, fix D0~D5 pads to VDD or VSS level.
When the chip select is inactive, D0 to D7 are set to high impedance.

14

VDD

P

Power supply

15

VSS

P

Ground

16

VOUT

0

DC/DC voltage converter output

17

CAP3P

O

Capacitor 3+ pad for internal DC/DC voltage converter.

18

CAP1N

O

Capacitor 1- pad for internal DC/DC voltage converter.

19

CAP1P

O

Capacitor 1+ pad for internal DC/DC voltage converter.

20

CAP2P

O

Capacitor 2- pad for internal DC/DC voltage converter.

21

CAP2N

O

Capacitor 2+ pad for internal DC/DC voltage converter.

22

V1

I/O

7.jpg

23

V2

24

V3

25

V4

26

V0

OUTLINE DIMENTION

8.jpg

9.jpg

1.How can I reduce the LCD signal noise?

Noise on an LCD signal can be reduced with a termination resistor and capacitor that can be tuned to the cable characteristics. This will allow you to soften the edges and reduce the noise. If the screen tears sideways, there is generally a problem with noise on the horizontal sync signal causing irregular resets to the left-hand side of the screen. If you see a vertical rolling effect, it is generally noise on the vertical sync line or a missing sync signal.

2.Is power sequencing important?

You must turn on the Vcc supply voltage, then within 10-20 milliseconds apply all of the data signals including the data bits, sync signals and clocks. If you apply the data signals before you apply power, you get into a latch-up condition. The LCD looks like a CMOS device that can draw high current if a signal is before Vcc is turned on. This makes the potential of a high current path to ground from the signal lines if Vcc is not applied before the data signals.

Secondly, the display needs an AC signal to function properly. If only a DC signal is applied, damage can occur. Generally the damage occurs slowly and is a function of duration, temperature and other conditions, but the effect is cumulative and failures will eventually occur. You can also have a latch-up problem if you wait too long to apply the Sync signals.

Some displays have a built-in voltage doubler. If you don't apply the clocks quickly enough, you can create another latch-up condition in the display. A power sequencing latch-up problem almost always shows up as an all white or all black display. Then, if you turn it off and back on it may start working. Latch-up conditions are almost always recoverable. The only time when permanent damage occurs is when excessive power flows through driver’s ESD diodes.

3.How can I reduce EMI noise on my display and interface to ensure passing UL Certification requirements?

The source of most noise radiation from the display comes from the synchronization clock that runs at very high speeds. On a VGA display it runs at 25 MHz. The use of small R-C circuits or inductance on the data clock can soften the edges and lower the radiation. Shielding of the connection cable is another method to reduce noise, but it tends to be more expensive. Another technique for larger displays is to use LVDS transmission systems where the TTL signals are transmitted as low voltage differential signals. This is the technique used currently in most laptops.

It is also important to ground the display frame to a good AC signal ground. This helps contain the noise generated by the display as well as to become a shield for noise generated by electronics close to the display.

Hot Tags: graphic COG LCD display, China, manufacturers, suppliers, factory, customized
Related Products

Inquiry

  • Your Name:
  • *E-mail:
  • Phone:
  • Company:
  • Title:
  • *Content: