As consumers continue to use Internet of things (IOT) solutions to connect devices in the home to external and internal networks, smart speakers will be widely used in more and more families. In fact, the smart speaker market may continue to maintain a high growth trend; According to juniper research, by 2022, devices such as Amazon echo, Google home, apple homepod and SONOS one will be popular in most American families.
Conventional smart speakers use audio for feedback, but the new generation of products called intelligent display (or smart speakers with display function) can enrich the user experience through visual content (such as explaining videos, recipes and photos). However, large LCD displays are difficult to package into compact home speakers. DLP technology replaces the conventional LCD screen by projection, which brings more possibilities for designers.
Similar to the car’s center console display, consumers demand more visual content from their home information and entertainment centers. Having a simplified visual interface can enhance the content provided by today’s smart speakers. The displayed images need to be simple, and there is less need for touch interaction, because users usually view them from a distance of at least a few feet. For example, when you say, “Alexa, what’s on my shopping list?” The smart display should display large and bright text for easy reading from a distance.
The size of the projection will depend on the ideal display size, the type of display surface, the shape factors required for integration into the terminal device, and the distance between the projection unit and the display surface. Let’s elaborate on these tradeoffs: projected surfaces: not all surfaces in your home are ideal for displaying projected images. Colors, patterns, and surface curvature, such as kitchen countertops or wallpaper, can distort or obscure images. Higher brightness and algorithms such as Ti DLP intellibright can help overcome the influence of surface geometry, color and pattern on the display effect.
Module size: the size of the speaker is the main system design consideration. The projection module needs to be integrated into a unique and beautiful design. The size of optical engine mainly depends on its brightness, resolution and projection ratio. The DLP Pico optical engine is very compact and can be integrated into a smartphone or tablet, while some existing 100 lumen designs are as small as 50 cc.
Brightness: because intelligent display devices are usually located near the moving area (such as kitchen or living room), they need to be aesthetic and not abrupt. Integrated tablet size or larger displays usually do not meet this standard. However, DLP technology solves this challenge by the ability to project large pictures on a very small chip; For example, a single DLP chip can start from about 45 mm × 75 mm × A 15 mm (just over 50 cc) module produces a clear 30 inch image.
Resolution: the required resolution mainly depends on the information content to be displayed and the required image size. Resolutions as low as NHD (640 x 360) can be used for simple graphics and video, while QHD (960 x 540), 720p (1280 x 720) or higher are preferred for clearer display.
Projection ratio: the required projection ratio depends on the position of the product relative to the image surface. The projection ratio of telephoto lens is usually greater than 2:1. The projection ratio of short focus projection lens is usually 0.8:1 to 1:1, and that of ultra short focus projection lens is less than 0.5:1. Short focus projection and short focus projection lens are very suitable for equipment whose projection surface is very close to the projection module.
DLP Pico chipset has a variety of sizes and resolutions, which can adapt to different display sizes, brightness requirements and resolutions. Micro projection provides a variety of intelligent display options, including: ultra short focus projection, standard focus projection, surface projection, free surface projection. These options provide flexibility in the type of surface on which images can be displayed and can be designed for dual purposes, such as surface projection and ultra short focus projection in one device.