1.5 Inch 128x128 Dots 262k Color AMOLED Display ZIF Type UG-2828GDEDF11 SSD1351 Controller

SFOS150TW-7100AN SPECIFICATION.pdf

1.5 Inch OLED Display, 128x128 Dots 262k Color AMOLED Display SSD1351 Product Introduction

Product Quick Review

►Model No. UG-2828GDEDF11

►Type: Graphic
►Structure: COG
►Size:1.5 inch
►128 x 128 Dot Matrix
►IC:SSD1351
►3V Power supply
►1/128 Duty
►Interface: 8080,SPI,I2C
►Display Color: Full Color
 

Description

The Organic Light-Emitting Diode (OLED) is a new generation technology, brighter and clearer images with more agile responding speed. This OLED 1.5" inch model no. UG-2828GDEDF11 OLED display is made of 120 x 128 dots individual mono color. This OLED module is lightweight, low power and small, there are different interfaces optional; it is default SPI, Parallel and I2C interface.

The size of the active area is 1.5” diagonal with module dimension 33.80 × 34.00 × 1.60 (mm), active area dimension 26.855 × 26.864 (mm) .This 1.5 inches OLED display has built-in IC SSD1315and boasts high contrast ratio 20,000 : 1. Logic supply voltage ranges from 1.65V-3.5V, the typical value is 3V. It is great for the application such as medical device, POS system, white goods, home applications, industrial instrument, automation, audio/visual display systems, personal care appliances, household goods, automobile displays, Dynamic information displays etc.

Feature:

Supply Voltage for Operation(VDD ): -0.3- 4 V 
Supply Voltage for I/O Pins(VDDIO):  -0.3 - 4 V 
Supply Voltage for Display(VDDH): -0.3 - 15 V
Life Time (80 cd/m2) : 10,000  hour

1.5 Inch OLED Display, 128x128 Dots 262k Color AMOLED Display SSD1351 Product Drawing

1.5 Inch OLED Display, 128x128 Dots 262k Color AMOLED Display SSD1351 Product Image

Designing Precautions for OEL display module

1) The absolute maximum ratings are the ratings which cannot be exceeded for OEL display module, and if these values are exceeded, panel damage may be happen.
2) To prevent occurrence of malfunctioning by noise, pay attention to satisfy the VIL and VIH specifications and, at the same time, to make the signal line cable as short as possible.
3) We recommend you to install excess current preventive unit (fuses, etc.) to the power circuit (VDD). (Recommend value: 0.5A)
4) Pay sufficient attention to avoid occurrence of mutual noise interference with the neighboring devices.
5) As for EMI, take necessary measures on the equipment side basically.
6) When fastening the OEL display module, fasten the external plastic housing section.
7) If power supply to the OEL display module is forcibly shut down by such errors as taking out the main battery while the OEL display panel is in operation, we cannot guarantee the quality of this OEL display module.
8) The electric potential to be connected to the rear face of the IC chip should be as follows: SSD1315
* Connection (contact) to any other potential than the above may lead to rupture of the IC.
 

About AMOLED

Display full color is an important sign to check whether the display is competitive in the market, so many full color technologies are also applied to OLED displays, according to the type of panel usually has the following three: RGB pixel independent light, color filter and light color conversion.

RGB pixels emit light independently

The use of luminescent materials to emit light independently is currently the most used color mode. It is the use of precision metal shade mask and CCD pixel alignment technology, first prepare red, green, blue three primary color light emitting center, and then adjust the color mixing ratio of the three color combinations to produce true color, so that the three-color OLED element independently emits light to form a pixel.

The key to this technology is to improve the color purity and luminous efficiency of the luminescent material, as well as to improve the etching technology of the metal shadow mask.

As the core of OLEDs, organic semiconductor light-emitting materials typically contain conjugated small molecules, metal complexes, and polymers with rigid planar structures. The characteristics and classification of commonly used trichromatic materials are as follows:

1. Blue luminescent material

Blue light typically emits light at a wavelength of about 450 nm, corresponding to a photon energy of about 2.76 eV. Compared with the red and green luminescent materials, the conjugation degree of the blue luminescent materials is smaller, and most of them show a twisted and rigid structure. Commonly used blue light materials are TMTPEPA, BDPAS and ST-G1.

2. Green luminescent material

The luminous wavelength of green light is about 532nm, and the corresponding photon energy is about 2.33eV, and the commonly used green light-emitting materials are Alaq3, TDETE, Coumarin, NpGl, etc.

3. Red luminescent material

The luminescence wavelength of red light is about 65nm, and the corresponding photon energy is 1.9 ev, and among the three primary colors, the difference between HOMO and LUMO energy levels of red light-emitting materials is the smallest, and the commonly used red light materials are red fluorene, PTPP, DCJTB and Tz-Gl.

The biggest bottleneck faced by organic small molecule luminescent materials is that the lifetime of RGB materials varies greatly, especially the purity, efficiency and lifetime of red and blue materials need to be improved. Therefore, through the hybridization of the main luminescent material, the blue and red light with high color purity, high luminous efficiency and strong stability are obtained. Compared with small molecule luminescent materials with clear molecular structure and molecular weight, the advantage of polymer luminescent materials is that their luminescence wavelengths can be adjusted by chemical modification to obtain various colors covering the entire visible range from blue to green to red, but their lifetime is shorter than that of small molecule luminescent materials, and the light efficiency and lifetime need to be improved.

With the colorization, high resolution and large area of OLED displays, the etching technology of metal shadow mask directly affects the quality of the display board image, so more stringent requirements are put forward for the dimensional accuracy and positioning accuracy of metal shadow mask graphics.

Regarding the independent emitting of RGB pixels, we have to talk about the pixel arrangement. At present, the Pentile RGB arrangement represented by Samsung in the AMOLED screen is the most well-known, the single pixel of this arrangement is different from the standard RGB arrangement, and most AMOLED screens use red-green or blue-green for each pixel to arrange, and then cleverly share sub-pixels when they are arranged side by side, so that the entire screen still achieves full color display.

Deficiencies

1. AMOLED adopts the Pentile pixel arrangement, the actual resolution can only reach two-thirds of the nominal, in the case of low dpi, the graininess will be very heavy, and the color dots can be seen at close range, and all color block boundaries such as text, tables, and graphics need to be displayed with the help of nearby pixels to help emit light, resulting in serious and inevitable problems such as blurred edges and variegated colors.

2. AMOLED's emphasis on green color causes it to be too vivid and cause eye fatigue when viewed for a long time. There is a problem with the color temperature of AMOLED (or with Pentile).

3. AMOLED has a super high contrast ratio, but when displaying a darker picture, it is prone to color patches, especially in dynamic images. And its ultra-high contrast comes in part from the non-luminous blacks.

4. Each pixel of AMOLED is an independent emitter, so during the aging process, different pixels may have different degrees of aging, resulting in different brightness, so the color cast problem will become more complicated.

5. When the display is white, AMOLED consumes more power than LCD, so why do the UI of mobile phones with AMOLED screens are dark colors. However, at present, the images of applications such as surfing the Internet, games, and e-books are almost all in high-brightness colors, and the background color of most websites is white.

Theoretically, the lack of a color per pixel is not a big problem, and the display driver can be displayed with the adjacent one.

However, in practice, this is more demanding on the software, and the image is likely to produce artifacts and mura. Regarding AMOLED display, in addition to pixel design, there is also driver technology, which is also one of the key technologies. The following is a description of common designs of OLED pixel driver circuits.

( go to 1.45 inch product description to read more) 

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