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WISECHIP - OLED Display FAQ

Wisechip - formerly known as Univision
formerly known as Univision

OLED Display Performance and Lifetime
Display Control
Applications
Tools
Future developments


OLED Display Performance and Lifetime

Q:  What are OLED's advantages to be considered as the next generation's display technology?

A:  OLED's advantages include wide viewing angle, lower power consumption, easy processing, thinner and lower weight, fast response time, low power voltage, and the visual quality is better than LCD now. After making improvement on mass production capability and competitive pricing, OLED will definitely be the next generation display technology.


Q:  What is OLED's power consumption compared to TFT and STN?

A:  It depends on how the panel is used. Under the condition wherein the backlight is fully turned on, STN & TFT will consume around 200 mW, and OLED is 20~50 mW, so OLED will have lower power consumption.


Q:  What is the power consumption at various conditions?

A:  With display panel OFF: < 0.8mA. With display panel and controller IC OFF: < 0.1mA. With timer only ON:, < 1mA ( 200 cd/m2, 100 pixels turn-on).


Q:  About the lifetime issue, what's the definition of 15,000~20,000 hours? Does it mean that after being through 15,000 hours, the panel will be dead, or just decline in color?

A:  The above specification means if brightness is reduced from 100 cd/m2 to 50 cd/m2, its lifetime will range from 15,000~20,000 hours. However, in real case, we can keep the same brightness by controller by increasing current supply, so the real lifetime will be longer.


Q:  Would increasing the Vcc voltage (using internal DC-DC voltage converter) over the display's lifetime counteract any degradation of the luminance of the display over its lifetime?

A:  Increasing the voltage (internal or external) will increase the panel's brightness but will shorten its  lifetime. The relationship of voltage and lifetime are recorded in the data sheet, however, we cannot provide the correct proportion between them.


Q:  I know luminance is a function of temp but is it also a function of voltage?

A:  Yes, it is a function of voltage and that influences current density through the OLED.


Q:  When the display is off (using register command AE-AF) the lifetime of the OLED display is not being reduced?

A:  When the display is off, there will be no current through the OLED. In this state, temperature is the only factor that influences the display's lifetime. Depending on the different driver and software settings, different results can occur.


Q:  When in storage at 30-40°C and the display is off, will this reduce the OLED display's lifetime?

A:  Yes, but it is very minor.



Display Control

Q:  Can customer adjust the brightness?

A:  Yes, there is a total of 16 levels of brightness available.


Q:  What is the minimum pixel pitch?

A:  Currently min pixel pitch is 0.21 mm. After mass production min pixel pitch will be 0.18 mm.


Q:  The SSD1303 datasheet refers to 4 colour areas/banks as A, B, C and D. How do these relate to the Light Blue, Green, Orange and Yellow regions on the display?

A:  Area color uses different radiation material in order to produce the different color specific to the panel design. Bank color adjusts the brightness for the different area and relates to the design of SSD1303. The design of the area color of 13264 is not based on the color bank, thus, it cannot totally meet the requirement of color bank. These are two different things so we recommend not to use bank color.


Q:  It is not clear from how the description of 'write' what we have to do. For instance it describes selecting the address using commands 0-1F. When writing the data it says it will auto-increment the address with each write. BUT, does that mean after each 8-bit write, or 64-bit write or what?

A:  The following example illustrate this point where we need to fill one data in column 0~63, page 0~3

for (j=0; j<4; j++)                                //Page
{                                                          //Start Address Column
           Write_Command(0x00|0);      //Low Nibble        
           Write_Command(0x10|0);      //High Nibble       
           For(i=0; i<64; i++)                   //Column
           {
                     Write_Data(&data);       //auto increment
           }
}


Q:  Can we write selectively to say the top line (the 8 line coloured regions)?

A:  Fill the data which you would like to show in the page 0  and set up the location of area color then the picture will show up in the area color.


Q:   If we use the Inverse option, do the small colour regions do a local inversion?

A:  The Inverse instruction is for the data opposite of the white panel. Command A6-A7 is for Inverse, Light<->dark. Command C0-C8 is for upside down. These two commands is for full panel area only. It cannot control a small area.


Q:  Does OLED need color filter?

A:  No, it doesn't.


Q:  What is the size of the IC RAM?

A:  Around 22K Byte.


Q:  SSD1303 Controller

According to the SSD1303 datasheet there is also a command to adjust the brightness for the colour banks (CMD 0x82). When we adjust the brightness using the above command we do not see any change to the display. We have verified that the correct message and data is being sent to the display at a hardware level.

Does the brightness command work with the Univision display?

Is there any more information available on the brightness command for the Univision display other than what is in the SSD1303 datasheet?

A: The "Command 0x82" is workable & related to the "Command 0xD8".  Here are the examples for reference.

1) Command 0xD8 / 0x05 (Mono Color Mode)

    The brightness for "Bank 0~32" (Page 0~7) are all adjusted by "Command 0x81".

    The "Command 0x82" is useless.

2) Command 0xD8 / 0x35 (Area Color Mode)

    The brightness for "Bank 0" (Page 2~7) is adjusted by "Command 0x81".

    The brightness for "Bank 1~32" (Page 0~1) are adjusted by "Command 0x82 / 0x91 / 0x92 / 0x93".


Q: How long does it take for the hardware draw routines such as rectangle, circle, copy paste, in the SSD1339 Driver IC for the UG-2828GDEDF01 from Univision?

A:

1) 500ns per Pixel on Using Graphic Acceleration Function

    Example: 96RGB*64 Rectangle  => 96*64*500 (ns) = 3.072 (ms)

2) 10ms to ensure the operation has been  completed. This is a set time for any operation.



Applications

Q:  Can OLED be used in medical instruments to solve LCD's weakness of low response time? How about advertising board, to solve the insufficiency in brightness?

A:  Yes, OLED's high brightness can make up for the weakness of other display technologies.


Q:  Which commercialized products use Univision's OLED displays?

A:  Univision's OLED displays has been applied to numerous applications, including mobile phones and MP3 players. We expect there will be more applications and models in the market since we have gained quite high customer satisfaction.


Tools

Q:  What interfaces are available on the UG-5664 EVK?

A:  The UG-5664 EVK is fixed to Parallel Interface only.  For Serial Interface evaluation, the user has to cut off the connection between P/S & VDD and then connect P/S to GROUND.



Future Developments

Q:  Do you have any plans for PLED or Active Matrix line?

A:  We may not take PLED into consideration due to some unsolved problems of blue materials, but active matrix is part of Univision's future developments.


Q: Do you have plans to use flexible / plastic substrate?

A:  In the future Univision will use Plastic Substrate. But for now we use glass substrate, 0.5mm ~ 0.7mm; and cap : 0.7mm ~ 1.1mm.