March 04,2022

For more information, please visit Custom VATN LCDs Display.

Preface:

Winstar provides thousands of model display modules, including TN/STN LCD, OLED, and TFT. And there are many types of interfaces to deliver image data to the display module. Customers may question which one is the best or can meet the requirement. This article will discuss an issue regarding the data transfer of display interfaces.

A significant issue with the display interface is Communication bandwidth (BW). Why is BW a matter? BW represents the measure of data transfer in the communication channel. So the BW affects display response to screen data, which means the display's refresh rate. The display performance, in other words.

Introduction:

Well-known display interfaces nowadays:

1.Parallel

 

1-1 MCU interface 8080/6800

Display raw data sent via Data bus according to control bus signal. Communication bandwidth depends on enabling speed running on Driver IC. QVGA 320x240 dot matrix LCD i.e., the communication bandwidth will be 320 * 240 / 8 bit (data width) * 60 fps = 576KHz at ENABLE signal.

1.2 Parallel RGB 16/18/24 bits

The RGB interface is to transmit the drive timing to the display driver IC through the data input/output in a parallel manner, including R/G/B data, vertical synchronization signal (V-SYNC, Vertical synchronizing signal), horizontal synchronization signal (H-SYNC), horizontal synchronizing signal), data enable (DE, Data Enable) signal, and clock signal PCLK (Pixel Clock). The display interface of RGB666 is as follows:

Display raw data transferred same as above. But the display resolution is getting higher and higher. i.e., WVGA 800 * 480 (pixels) * 60 fps = 23.04 MHz. (PCLK)

2.Serial

 

2.1 SPI (Serial Peripheral Interface)

SPI is a master-slave-based interface, usually with a Master (master device) and one or multi slave (slave devices). There are 4 pins on the interface. The connection method and hardware structure are as follows:

[SPI interface structure]

 

SCLK: The synchronous clock used by all devices. The master drives this clock and the slaves receive the clock.

MOSI: Master out, slave in. This is the main data line driven by the master to all slaves on the SPI bus. Only the selected slave clocks data from MOSI.

MISO: Master in, slave out. This is the main data line driven by the selected slave to the master. Only the selected slave may drive this circuit. In fact, it is the only circuit in the SPI bus arrangement that a slave is ever permitted to drive.

CS: Chip Select. This signal is unique to each slave. When active the selected slave must drive MISO.

[Example of SPI schematic]

 

Display data transferred in sequential. Display interface communication bandwidth i.e., QVGA 320 * 240 (pixels) * 16 bit (color depth) * 30 fps = 36.864 MHz.

2.2 IIC (Inter-Integrated Circuit) or alternatively known as I²C):

Different from the point-to-point (or point-to-multipoint) base of SPI, I²C is interfaced in the form of a data bus, which allows multiple master devices and multiple slave devices to be connected in series. The interface method and hardware structure are as follows:

[I²C schematic]

 

[Courtesy of Analog device]

 

Standard mode = 100K bit/s.
Full speed mode = 400K bit/s.
Fast mode = 1M bit/s.
High speed mode = 3.2M bit/s.

2.3 Serial RGB 6/8 bits.

Display data transferred in RGB sequential. Display interface communication bandwidth i.e., QVGA 320 * 240 (pixels) * 3 dot * 30 fps = 6912000 Hz (DCLK).

 

2.4 LVDS: Low voltage differential signal. It should name FPD-Link for the display interface.

LVDS is a technical standard introduced in 1994 that specifies electrical characteristics of a differential, serial signaling standard, but it is not a protocol. LVDS is a physical layer specification only; many data communication standards and applications use it and add a data link layer as defined in the OSI model on top of it. LVDS operates at low power and can run at very high speeds using inexpensive twisted-pair copper cables.

Early on, the notebook computer and LCD display vendors commonly used LVDS instead of FPD-Link when referring to their protocol. The term LVDS has mistakenly become synonymous with Flat Panel Display Link in the video-display engineering vocabulary.

 

2.5 MIPI CSI/DSI: Mobile Industry Processor Interface.

[Display view of DSI.]

 

MIPI Alliance aimed at reducing the cost of display controllers in mobile devices. It defines a serial bus and a communication protocol between the host, the source of the image data, and the destination device. It is the expected target at LCD and similar display technologies.

[System view of DSI.]

 

DSI specifies a high-speed (e.g., 4.5 Gbit/s/lane for D-PHY 2.0) differential signaling point-to-point serial bus. This bus includes one high-speed clock lane and one or more data lanes.

Image data on the bus is interleaved with horizontal and vertical blanking intervals signals. The data is transferred to the display in real-time and not stored by the device to save frame buffer memory in the display. However, it also means that the device must be continuously refreshed (at a rate such as 30 or 60 frames per second) or lose the image. Image data is only sent in HS mode. When in HS mode, commands are transmitted during the vertical blanking interval.

An experimental example of display interface MCU 8080/6800:

 

A LCD controller has been phased out, and the customer would like to have a pin-to-pin compatible module to replace it. RD owners had designed a PCB with an MCU for the compatible interface. The experimental results on ENABLE signal must be as long as 9.92uS at least. This means the maximum communication BW is around 100KBPS.

[Chanel1 –E pin@9.92uS, Chanel2 – CS pin]

 

We can see a few defect points below when shortening ENABLE time as 9.84uS (the communication speed is up to 101KBPS).

[Chanel1 –E pin@9.84uS, Chanel2 – CS pin]

 

A comparison table on display interface:

 

Which interface is the best? There is no absolute answer to this question. The users should choose the suitable interface for their applications, not the best. Let's see the following comparison of the pros and cons of these interfaces.

Display Interface

Resolution

Speed

Pin Count.

Noise

Power Consumption

Connect Distance

Cost

MCU 8080/6800 Middle

Low

More Middle Low Short Low RGB 16/18/24 Middle Fast More

Worst

High

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Short Low SPI

Small

Low

Less Middle Low Short Low I²C

Small

Low

Less Middle Low Short Low Serial RGB 6/8 Middle Fast Less

Worst

High

Short Low LVDS

Large

Fast Less

Best

Low

Long

High

MIPI

Large

Fastest

Less

Best

Low Short Average

LCD Display STN 320x240

General Specification:

 

 
Power Supply  
3.0V  
Display Type  
STN, POSITIVE ,TRANSFLECTIVE  
Viewing Direction  
12.00 O'clock  
LCD Driving Method  
1/65 Duty, 1/9  Bias, 3.0V  
Driver IC  
ST7565R

 Layout Drawing:

Lcd 

 Image:

Product Applications:

Products  Application field:

Audio product    Medical Equipment  

Industrial product(watermeter, electronicmeter,Equipment )

Automobiles  Sports Equipment   Watches   Household appliance(air condition/wash machine/electronic cooler/ refrigerator/disinfection cabinet/ wash bowl machine/ calculator /electronic scale etc.)

 

 

Our Advantage:

 

Rich experience Good knowledge of the displays market to put together solutions that add value and provide a unique proposition for the client Advanced Equipment Full automatic FPC&IC bonding machine, film attaching machine, CNC machine, polish machine advance production equipment ensure product quality Quality Assurance Advance inspection instrument and equipment to ensure 100% inspection for each and every piece before shipment Fast response Quickly realize your customized ideas, and have a sample ready in short time Low MOQ Depends on product Stable supply 1~10 years supply period Extensive range Providing complete solution from Mono to Color LCD module, Optical bonding between display to cover glass as well as cover glass to touch screen Large production capacity Operation capacity 2KK monthly Quality guarantee RoHS compliant Management ISO 9001:2008, ISO 14001:2004

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☆ Antistatic floor, resistance : 1x10 ohm to 1x10 ohm

☆ COG production lines: 4 .

☆ Backlight production lines: 2 .

☆ Existing machine capacity will be 1KK per month.

***In compliance with ISO9001: 2008 Quality Management
***One year's guarantee for unartificial damage
--------------------------------------------------------------------------------------------------------------------

List of Exiting COB LCD Modules:

  Model Content
CharsXLines Module size
W x H(mm) View area
W x H(mm) Dot size
W x H(mm) Character size W x H(mm) Driving Method Controller LSI or Equiv IC
Package STN-TYPE FSTN-TYPE 8D-C0802A 8X2 84.0X44.0 63.0X25.0 1.15X1.36 6.07X11.56 1/16 S6A0069 COB Y Y 8D-C0802B 8X2 58.0X32.0 38.0X16.0 0.56X0.66 2.95X5.56 1/16 S6A0069 COB Y Y 8D-C1202A 12X2 55.7X32.0 46.7X17.5 0.45X0.6 2.65X5.5 1/16 S6A0069 COB Y Y 8D-C1601A 16X1 80.0X36.0 64.5X13.8 0.55X0.65 3.2X5.95 1/16 S6A0069 COB Y Y 8D-C1601B 16X1 122.0X33.0 99.0X13.0 0.92X1.1 4.84X8.06 1/16 S6A0069 COB Y Y 8D -C1601C 16X1 80.0X36.0 64.5X13.8 0.6X0.7 3.2X8.2 1/11 S6A0069 COB Y Y 8D -C1601D 16X1 85.0X28.0 65.0X16.0 0.55X0.75 3.07X6.56 1/16 S6A0069 COB Y Y 8D -C1601E 16X1 80.0X36.0 64.5X13.8 0.55X0.75 3.07X6.56 1/16 S6A0069 COB Y Y 8D -C1602A 16X2 80.0X36.0 64.5X13.8 0.55X0.5 2.95X4.35 1/16 S6A0069 COB Y Y 8D -C1602B 16X2 122.0X44.0 99.0X24.0 0.92X1.1 4.84X9.66 1/16 S6A0069 COB Y Y 8D -C1602C 16X2 80.0X36.0 64.5X15.5 0.55X0.66 2.96X5.56 1/16 S6A0069 COB Y Y 8D -C1602D 16X2 84.0X44.0 64.5X15.5 0.55X0.66 2.96X5.56 1/16 S6A0069 COB Y Y 8D -C1602E 16X2 85.0X36.0 64.5X15.5 0.56X0.66 2.96X5.56 1/16 S6A0069 COB Y Y 8D -C1602F 16X2 72.0X36.0 64.5X15.5 0.56X0.66 2.96X5.56 1/16 S6A0069 COB Y Y 8D -C1604A 16X4 87.0X60.0 62.0X25.6 0.55X0.55 2.95X4.75 1/16 S6A0069 COB Y Y 8D -C2001A 20X1 116.0X37.0 83.0X18.6 0.6X0.65 3.2X5.55 1/16 S6A0069 COB Y Y 8D -C2002A 20X2 98.0X60.0 83.0X18.6 0.6X0.65 3.2X5.55 1/16 S6A0069 COB Y Y 8D -C2002B 20X2 116.0X37.0 83.0X18.6 0.6X0.65 3.2X5.55 1/16 S6A0069 COB Y Y 8D -C200C 20X2 146.0X43.0 123.0X23.0 0.92X1.1 0.98X1.17 1/16 S6A0069 COB Y Y
 
 
 

List of Exiting COG LCD Modules:

 
  Model Content
 (W X H) Module size
W x H(mm) View area
W x H(mm) Dot size
W x H(mm) Dot pitch
W x H(mm) Driving Method Controller LSI or Equiv IC
Package STN-TYPE FSTN-TYPE 8D -C2004A 20X4 98.0X60.0 76.0X25.2 0.55X0.55 2.95X4.75 1/16 S6A0069 COB Y Y 8D -C2004B 20X4 77.0X47.0 60.0X22.0 0.42X0.46 2.3X4.03 1/16 S6A0070 COB Y Y 8D -C2004C 20X4 146.0X62.5 123.5X43.0 0.92X1.1 4.84X9.22 1/16 S6A0069 COB Y Y 8D -C2402A 24X2 118.0X36.0 93.5X16.0 0.6X0.65 3.2X5.55 1/16 S6A0069 COB Y Y 8D -C2402B 24X2 208.0X40.0 178.0X23.0 1.16X1.16 6.0X9.63 1/16 S6A0069 COB Y Y 8D -C4001A 40X1 182.0X33.5 154.4X16.5 0.6X0.75 3.2X6.35 1/16 S6A0069 COB Y Y 8D -C4002B 40X2 182.0X33.5 154.4X16.5 0.6X0.65 3.2X5.55 1/16 S6A0069 COB Y Y 8D C4004A 40X4 190.0X54.0 147.0X29.5 0.5X0.55 2.78X4.89 1/16 S6A0069 COB Y Y 8D -G12232A 122X32 84.0X44.0 60.0X18.5 0.4X0.4 0.44X0.44 1/32 SED1520 COB Y Y 8D -G12232B 122X32 80.0X36.0 55.0X18.5 0.36X0.41 0.4X0.45 1/32 SED1520 COB Y Y 8D -G12232C 122X32 98.0X60.0 76.0X25.2 0.53X0.61 0.57X0.65 1/32 SED1520 COB Y Y 8D -G12232D 122X32 80.2X47.4 76.0X25.2 0.53X0.61 0.57X0.65 1/32 SED1520 COB Y Y 8D -G12864A 128X64 78.0X70.0 62.0X44.0 0.39X0.55 0.44X0.6 1/64 S6B0108A COB Y Y 8D -G12864B 128X64 105.0X60.5 72.0X40.0 0.48X0.48 0.52X0.52 1/64 S6B0108A COB Y Y 8D -G12864C 128X64 93.0X70.0 72.0X40.0 0.48X0.48 0.52X0.52 1/64 S6B0108A COB Y Y 8D -G12864D 128X64 113.0X65.0 72.0X40.0 0.48X0.48 0.52X0.52 1/64 S6B0108A COB Y Y 8D -G12864E 128X64 93.0X70.0 72.0X40.0 0.48X0.48 0.52X0.52 1/64 ST7920 COB Y Y 8D -G19264A 192X64 130X65.0 104.0X39.0 0.46X0.46 0.51X0.51 1/64 S6B0108A COB Y Y 8D -G19264B 192X64 120X62.0 104.0X39.0 0.46X0.46 0.51X0.51 1/64 S6B0108A COB Y Y 8D -G24064B 240X64 180.0X65.0 132.0X39.0 0.53X0.53 0.49X0.49 1/64 T6963C QFP/COB Y Y 8D -G240128A 240X128 144X104 114X64 0.4X0.4 0.45X045 1/128 T6963C QFP/COB Y Y

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FAQ:

1. I want the LCD display 8 digits and the outline size is 65x30x2.8mm...…?
   Answer: No problem. Firstly, please kindly send us your specification/ drawing paper 
   If you have not the specification, you can also provide your samples; we will recommend the suitable one if it is standard products. Or we can customize for you based on your own requirement.

2.This LCD  is just what we want, but it is big size, do you have any smaller size? And the display content need to be changed a little.
      Answer: For the segment type LCD module, if you need modify the outline size or display content,
a new LCD glass module is need. We have to open new tooling for you.

3. This LCD display is HTN type, but I want STN type,can you make?
      Answer: That's all right .  we can change for you as per you request.

4. I want customize a new LCD module. Can you do?
      Answer: Yes, we can. Please send your drawing paper. If you have not, please advise me the outline size 
of the LCD display, display information( Glass thickness, Polarizer, Display Type, Connector mode,
Storage Temp. Operating Temp.  Supply Voltage, Viewing direction, drive condition), we can customize for you.

5. What is leading time for tooling?
      Answer: General speaking, it will cost 15 to 25 days  after drawing paper confirmation and tooling charge payment,
we can report you the exact time when you confirm the drawing paper.

6. Can you send us samples for checking?
     Answer: Yes,. Samples order is available.

7. What is the Leading Time?
    Answer: If we have stock for the standard ones, the leading time is one day after payment. If it is the mass production for 
special ones, the leading time is about 15-30 days. suppose we can finish earlier,  we will report the information in advanced.
 

Our Services:

1. Free repair within one year after the shipment of products from us.
2. Replacement within 30 days after the shipment of products from us due to products' problems.
3. We can print your logo and stick your model No.on the cameras.
4. We have long cooperation with many shipping companies and our export volume is large. The shipping companies 
can offer us good discounts.
5. Professional technician supports. We have a good after-sales service team. They can solve your problems in time.
6.All goods will be inspected and tested by our engineers and QC/QA before packing and shipment.
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8.Products pictures only for your reference. please kindly refer to the specification. we can provide the products basic on the specification. or you can offer your own specification or drawing , we can customize all kinds of LCD displays for you. thanks for your kind support always.
 
  

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 BigBook International Co., limited.
Contact person: Echo Wang  (Ms.)

 

***In compliance with ISO9001: 2008 Quality Management***One year's guarantee for unartificial damage--------------------------------------------------------------------------------------------------------------------Carton boxess, Cupboard , EPE, Blister Tray, About the package way, it is up to the size of products,according to customer request and demand. Different countries have not same requirement..Expr ess way as DHL,Fedex,EMS,UPS,air shipping,sea shipping,Any shipping method you prefer.

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