This is where display solution providers like Densitron, who work side by side with display makers, can help customers by facilitating the display decision process. With an in-depth knowledge of new and dated technologies, each one with its own specific benefits and disadvantages, the display solution provider is able to offer the solution that best fit the application. As a result, a suitable yet cost effective project can be achieved in timely manner.Starting from the hottest OLED technology, the following case study shows how recent progresses in manufacturing and reliability have allowed this eye-catching display to be considered for industrial applications. It also reveals how Densitron have helped the customer right across the whole development stage.For a new audio/video equipment, the customer needed a display that would differentiate its product. The challenge was to enhance the performances of current VFD technology with a product of similar properties, easy to interface and drive, durable and cost competitive. The choice fell on Densitron DD-25664YW-1A, a passive matrix yellow OLED, for the following reasons:Higher pixel resolution - 256 x 64 dots with 16 grey scalesBright, saturated and sharper yellow pixelSlimmer profile - only 2.2 mm thickNoiselessLower power consumption - 200 mW typical Easily interfaced to 8080, 6800 or serial bus systemsOperating lifetime of more than 50,000 hoursCost competitiveAs soon as the decision was made, the customer needed to interface the OLED, as well as start creating the user interface. While supporting the first issue with software code, suitable connector boards, and application backing, Densitron proposed DUO, an extremely easy yet powerful demonstration tool for driving OLED displays from the USB port of a desktop or laptop PC. The simple and user-friendly software application allowed quick download of logo, menu, warning messages, and gave the customer the ability to generate and save multiplele slide shows for immediate results. This considerably reduced the turnaround time to build the HMI interface, benefiting the development schedule of the project.With the largest and highest performance STN colour product line in the market, Kyocera maintain a dedication to what many other manufacturers have wrongly treated as a forgotten technology. The recent release and immediate success of; wide viewing angle (Upper-Down 110°, Left-Right 135°), extended temperature range (-20 to 70 °C), LED backlit and transflective 5.7" CSTN panels has demonstrated the market needs to bridge the gap between old poor quality STN displays and the expensive by comparison (sometimes 'overkill') TFT solution.Kyocera colour STN LCDs are also known to have brighter, richer colours than competing displays. One reason for this is that Kyocera manufactures its own colour filters, a critical component in the display design. On a colour STN display, each sub pixel cell operates by transmitting or disrupting light. Each sub pixel has a characteristic colour: red, green or blue. The colour filter is the film sheet that supplies this colour. When light passes through the colour filter, all the other colours are blocked, leaving only the specific colour of that sub pixel. A colour filter that more aggressively blocks unwanted colours will produce a display with more saturated colours. The chromaticity coordinates for the red, green and blue colours, when plotted on the CIE colour space, make a triangle whose area is the colour gamut of the display. The more pure the primary colours, the greater the range of colours that can be made by the display (figure 2).

In the example shown here, the chart demonstrates the effect of recent improvements by Kyocera in the colour filter for transflective panels. It is important to remember that the primary goal is to produce a liquid crystal display panel that looks better. Colour gamut, brightness, reflectivity and contrast ratio merely quantify different aspects of appearance. Specifications can be helpful, however Densitron invite end users to examine LCDs in side-by-side demonstrations.Transflective LCDs combine the features of transmissive and reflective LCDs. In a transflective display, the bright ambient light is reflected back in lighted sub pixels, so the brighter the ambient light - the brighter the display. In low light environments, the backlight provides sufficient light for an attractive transmissive display.In 2003 Kyocera began the transition to Internal Slit-mirror (ISM) transflective architecture (figure 3). As shown below, the mirror is completely reflective, but with holes in each sub pixel to allow the backlight to shine through. The size of the holes determines whether the transflective performance is reflective-rich or transmissive-rich. There are also slits in the colour filter that allow more light to be reflected by an "on" sub pixel, thus increasing the contrast in reflective mode.As a result of years of development, Kyocera is now recognized as the leader in transflective technology. Today industrial and medical applications can finally benefit from a display that combines Kyocera renowned optical qualities with true sunlight readability, without the need of a complicated, power hungry and costly backlight system. There are situations when moving from monochrome to colour screen pose tensions on customer's resources, both engineering and financial. At the same time, the migration from monochrome to colour is pursued as a way to differentiate and enhance the product range. Densitron has come up with the solution to this dilemma, offering an innovativive LCD product: a 320x234 dot, 32K colours, 5V operation, 8051-bus interface TFT LCD for low-to-mid volume industrial applications.Utilising its Human-Machine Interface (HMI) experience, Densitron's LMR67802 TFT LCD module is designed to reduce the hardware and software re-design efforts by letting users drive a TFT LCD via the well known 8051-bus.The LMR67802 is a compact (148 x 120 x 19.4mm) TFT LCD module with the following features:Separate On-Screen Display function (character/text) and graphic interfaces. Graphic contents can be addressable directly from ROMBuilt-in 5x8 English, Japanese and European Character Generator, and 16x16 English and numeric fonts, to reduce software development time Graphic download capabilities via RS232, a useful tool to quickly build a user interfaceBitmap graphic support On-board positive voltage and temperature compensation circuits Typical brightness of 300 nit Well located mounting holesThe TSR67802, with a factory fitted 4-wire resistive touch panel, complements the offer. During the product development, Densitron's engineers have overcome the 8051-bus slow refresh rate issue. Mastering this technique has allowed Densitron to produce a truly innovative product at extremely competitive prices, while ensuring designers will meet their time-to-market requirements.