Display platform with Ultrachip UC8156
For smaller Lectum® displays, we have developed a platform based on the Ultrachip UC8156 for electrophoretic displays (EPD).
All displays developed on this platform have the following features:
- integrated display driver Ultrachip UC8156 with controller and power management (PMIC) as single chip
- up to 240 x 160 pixels supported
- single voltage power supply (1.7...3.6V), on-chip regulator control for generating driving voltages (external booster circuit required)
- host communication via SPI interface
- low current deep sleep mode
- on-chip display RAM and waveform memory available
- built-in temperate sensor or I2C interface to read external temperature sensor
Reference display – 1.38''
We currently offer one reference display for the Ultrachip platform.
|Reference design 1.38"|
|Resolution||180 x 100|
|Active area||30.6 x 17.0 mm (1.38" diagonal)|
|Pixel density||150 ppi|
|Bendability||typical 30 mm radius (except chip area)|
|Gray levels||up to four|
|Refresh rate||< 900 ms (4 gray-level) - faster for mono updates|
|Surface||anti-glare / UV protection /|
|EPD controller||Ultrachip 8156|
|Operating conditions||0°C to 40°C | 15 %rH to 85 %rH|
|Storage conditions||-25°C to 50°C | 15 %rH to 85 %rH|
- Organic TFT active matrix incorporating industry leading, bi-stable electrophoretic display technology
- Integrated display driver with controller and PMIC based on COP (chip-on-plastic) backend technology
- Host communication via SPI interface
- On-chip display RAM and waveform memory available
- I2C interface for reading external temperature sensor
- Thin, formable, robust, lightweight
- Ultra-wide viewing angle
- Ultra-low power – no continuous refresh cycles required
- Single voltage power supply (1.7… 3.6V), on-chip regulator control for generating driving voltages (external booster circuit required)
- Low current deep sleep mode
- Can be combined with third-party touch solutions
- Evaluation kit available for driving images, consisting of processor board and interface board HBZ9 with passives
|Evaluation kit code||Parrot MSP430: PLDEK_T430-HBZ9|
|Display EPD controller||Ultrachip UC8156|
|External EPD controller||n/a|
|Reference design board||HBZ9, containing active and passive components|
|System processor||MSP430F5428A (on Parrot board)|
|System operating system||None (microcontroller unit)|
|System data exchange||JTAG programmer|
|Interface board Ruddock||n/a|
|Miscellaneous||Small size; low power; microcontroller based; C-code for display operation available|
Sample pricing for display platform with Ultrachip
- 1.38" display $50*/each
- Parrot MSP430:
(display not included)
* Pricing does not include shipping, customs or taxes
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Display platform with Ultrachip - FAQ
Are Lectum displays available in color?
Lectum EPDs are not currently available in color. In the past, the company has demonstrated the ability to produce color displays, however, this process has not yet been industrialized for mass production.
Is video possible on Lectum EPDs?
Plastic Logic Germany has demonstrated animation (12 fps) on its EPDs. However, the faster update rate of the electrophoretic display media, which is required, results in a much higher power requirement than usual as well as a decrease in the display lifetime.
How much power do Lectum displays require?
Our Lectum displays are truly bi-stable meaning power is only needed for an update and not to show a static image. The energy required for a typical image update depends on the display size and driver chip setup; starting at just a few mJ per update for smaller displays, allowing battery-less NFC applications. For details please refer to the respective datasheet.
Why is the temperature range limited?
The temperature range for Lectum displays is determined by the electrophoretic display media used, which consists of microcapsules filled with a clear fluid. Low temperatures raise the viscosity of this fluid typically resulting in a slower response time for image updates. That is why the manufacturer states operation at a minimum of 0°C.
Why does Plastic Logic Germany offer different display platforms?
All EPD displays require an EPD controller and Lectum displays are no exception. Our reference displays use integrated hardware controllers. Different EPD controllers mainly differ in the maximum number of supported pixels as well as in cost. Depending on display requirements, we have selected some of the optimum EPD controllers and created a display platform based on each one. Discover more about the different platforms we offer here.
It is important to note that the number of pixels is not only dependent on the active display area but also on the pixel density (ppi).
What information is required in order to initiate a custom-design?
We require the following information from you in order to begin custom-design activities: display active area; pixel density; bezel size; location of driver electronics; COF/COP; overall module size including tolerances.
How do you decide which platform a custom design will be based on?
An initial analysis of the requested display active area and the pixel density (as well as a few other boundary conditions) informs the decision about the appropriate display platform. This happens as part of a milestone plan, which we have to developed, enabling a step-by-step development approach.
What is electrophoretic technology?
Electrophoretic technology refers to the process whereby thousands of microcapsules, containing (negatively charged) black and (positively charged) white pigments suspended in a clear fluid, are encapsulated in a plastic sheet.
When a charge (positive or negative) is applied, the corresponding particles move to the top of the microcapsule and the surface appears black or white in this specific area. When the charge is removed, the particles stay where they are. This is called bi-stability: where something can rest in either of two states.
In the case of an EPD, the text and/or images remain on the screen until the next update and the user can continue to view the content without the need for battery power. This means EPDs are inherently low-power and is one of the main differentiators to conventional backlit flat panel displays, where a constant power supply is required to maintain content.