Description Waveshare LF40-720720-ARK is a compact 4-inch IPS capacitive touch display with a square 720 × 720 resolution. It is designed for Luckfox Pico Ultra and Luckfox Pico Ultra W RGB screen applications, using a parallel RGB LCD interface with RGB666 data transmission for embedded UI, control-panel, and smart-device display projects. This Waveshare 4inch IPS capacitive touch display combines a GT911 capacitive touch chip, 400cd/m² brightness, 1000:1 contrast ratio, and 68% NTSC color gamut. The square 720×720 display format is especially useful for modern dashboards, compact HMI, rotary-style interfaces, and space-limited embedded products. Features 4-inch square IPS display with 720 × 720 hardware resolution. Capacitive touch with GT911 touch controller for interactive embedded interfaces. RGB666 parallel RGB interface for Luckfox Pico Ultra RGB screen applications. 400cd/m² brightness and 1000:1 contrast ratio for clear UI display. 68% NTSC color gamut for vivid color presentation in compact control panels. 170° viewing angle with IPS panel technology. 84.0 × 84.0mm outline dimension with 71.93 × 71.93mm display area. Works with Luckfox Pico Ultra and Luckfox Pico Ultra W RGB screen examples. Suitable for 720×720 graphical UI development, smart-device dashboards, and embedded control screens. Compact square layout makes it easier to design balanced touch interfaces and information panels. Specifications Item Specification Model LF40-720720-ARK Display Size 4 inch Resolution 720 × 720 Display Panel IPS Viewing Angle 170° Touch Type Capacitive Touch Chip GT911 Brightness 400cd/m² Contrast Ratio 1000:1 Outline Dimension 84.0 × 84.0mm (H × V) Display Area 71.93 × 71.93mm (H × V) Communication Interface RGB666 Display Color Gamut 68% NTSC Applications Luckfox Pico Ultra RGB display projects using 720×720 RGB screen support. Embedded HMI panels for compact device configuration and control. Smart home control screens, mini dashboards, and local status displays. Industrial and maker prototypes that need a square capacitive touch interface. Portable instruments, test equipment UI, and monitoring terminals. Graphical UI development for square layouts, gauges, menus, and icon-based controls. Product List LF40-720720-ARK ×1 Other Content The LF40-720720-ARK is intended for RGB screen development rather than HDMI or DSI projects. In Luckfox Pico Ultra and Luckfox Pico Ultra W examples, the RGB screen interface uses RGB666, and the provided image defaults to 720×720 output. This makes the screen a direct fit for compact embedded UI development where a square high-density display is preferred. Compared with rectangular small screens, a 4-inch 720×720 square display is easier to use for symmetric dashboards, clock-style interfaces, round-control layouts, device menus, and compact visualization panels. The Luckfox Pico Ultra W shown in the official usage example is for reference only and is not included. For related project background, see OpenELAB articles on the Waveshare ecosystem and Luckfox edge AI development. Resources Luckfox wiki: RGB Screen for Luckfox Pico Ultra Luckfox documentation center Luckfox Pico documentation Waveshare documentation center FAQ Q: What is the resolution of the LF40-720720-ARK?A: It has a 720 × 720 hardware resolution. Q: What interface does this display use?A: It uses an RGB666 parallel RGB communication interface. Q: Does this screen support touch?A: Yes. It supports capacitive touch and uses the GT911 touch chip. Q: Is the Luckfox Pico Ultra W board included?A: No. The Luckfox Pico Ultra W shown in usage examples is for reference only and is not included.
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