4 inch Circular G+G Capacitive Touch Screen for eBike Dashboards

4 inch Circular G+G Capacitive Touch Screen for eBike Dashboards

A 720 × 720 IPS touch display with a circular G+G front surface, RGB video input and a dedicated capacitive-touch controller for smart mobility interfaces.

Product Overview

The 4 inch Circular G+G Capacitive Touch Screen is designed for products that need a visually distinctive dashboard interface rather than a conventional rectangular display. Its circular black front surface supports centered ride information, radial indicators and touch-operated control menus for eBike dashboards, scooter consoles and other smart-mobility equipment.

The IPS TFT panel provides a 720 × 720 pixel workspace with a 101.52 × 101.52 mm active area. This resolution allows the interface to present speed, battery level, assistance mode, trip information, connectivity status and warning symbols without reducing the screen to a basic segmented instrument.

The display path uses an RGB interface, while the integrated G+G capacitive-touch assembly uses a CST3240 controller reference. Display data and touch communication must be qualified as separate electrical paths.

Key Specifications at a Glance

Circular Dashboard UI for Smart Mobility

Designing a 720 × 720 Ride-Information Layout

The 720 × 720 resolution provides a square graphics coordinate system behind the circular front design. This allows interface designers to build radial dashboards while retaining a predictable pixel grid for software development.

A typical eBike interface can place the current speed at the center, battery state near the upper edge, assistance mode around a radial arc and trip or connectivity information in secondary zones. Critical warnings should remain within the central circular safe area instead of being placed near the four corners of the framebuffer.

The circular format is especially effective for:

• speed and cadence gauges;
• battery rings;
• assistance-level selectors;
• turn or navigation indicators;
• trip distance;
• Bluetooth or phone status;
• lighting controls;
• warning and fault icons.

Circular Cover Form and Square Pixel Raster

The circular appearance does not mean the LCD uses circular pixels. The panel retains a square 720 × 720 raster and a 101.52 × 101.52 mm active region.

The UI must therefore account for content that may fall outside the visible circular window or beneath the printed border. Decorative backgrounds can extend into corner regions, but essential controls and text should remain inside an approved safe area.

The final safe area should be verified with the cover-lens artwork, bezel opening and assembled sample.

G+G Touch Interaction for Dashboard Controls

Touch Construction and Controller Qualification

G+G construction uses glass layers in the touch assembly and supports a finished front surface suitable for graphical dashboard controls. It can reduce dependence on multiple physical buttons and allow the interface to change according to ride mode or product configuration.

The CST3240 identifier confirms the named touch-controller reference but does not by itself confirm the host protocol, voltage, pin assignment, firmware support or touch-point count.

Before controller-board release, confirm:

• touch communications interface;
• controller supply voltage;
• interrupt and reset requirements;
• complete touch pinout;
• supported touch points;
• touch coordinate orientation;
• firmware or driver requirements;
• FPC direction;
• cover-lens dimensions.

Glove, Water and Accidental-Touch Testing

A capacitive-touch specification does not automatically establish glove operation, wet-finger support, water rejection or immunity to accidental activation.

These behaviours are important for eBike and mobility products because riders may operate the display while wearing gloves or in changing weather. They must be tested with the selected cover lens, controller settings, enclosure grounding and final firmware.

Where reliable operation cannot be demonstrated for the required conditions, the system may need physical backup buttons for safety-critical commands.

Integrating the 4 inch Circular G+G Capacitive Touch Screen

RGB Host and FL7707 Qualification

The display interface is identified as RGB. The host must supply the required pixel clock, synchronization signals, data mapping, voltage levels and complete pin assignment.

A generic RGB output does not guarantee direct compatibility.

The FL7707 driver reference helps identify the display platform but does not independently establish:

• RGB bit depth;
• timing values;
• initialization requirements;
• register programming;
• orientation configuration;
• panel voltage;
• power sequence;
• backlight-driver requirements.

Obtain the complete electrical specification before releasing the mainboard, display cable or firmware.

Display and Touch Signal Separation

The RGB connection carries image data to the LCD. The capacitive-touch controller communicates through a separate control path.

The host design should reserve distinct connections for:

• RGB pixel data and timing;
• panel logic power;
• backlight power;
• touch-controller communication;
• touch reset or interrupt signals;
• system ground and shielding.

The touch FPC should not be assumed to share the LCD’s RGB connector or pin assignment.

Optical and Mechanical Integration

Protected-Light Luminance Positioning

The panel is specified at 300 cd/m² typical luminance. This is suitable for many indoor, shaded or protected dashboard installations, but it does not establish direct-sunlight readability.

An eBike dashboard may experience strong ambient light even when installed under a cover. Final readability depends on:

• cover-lens transmission;
• printed border;
• surface reflections;
• air or optical bonding;
• viewing angle;
• dashboard hooding;
• backlight drive;
• environmental brightness.

The completed assembly should be evaluated under the target daylight and shaded-use conditions. A higher-luminance display route should be considered when direct-sun exposure is a primary operating requirement.

LCD Outline Versus Touch Assembly Size

The bare LCM and the combined touch assembly have substantially different dimensions:

The larger touch assembly controls the dashboard opening, front-cover space and installed depth. The LCD outline alone must not be used to release the finished enclosure.

Mechanical review should include:

• circular visible window;
• cover-lens outer profile;
• printed border;
• active-area alignment;
• touch-panel overhang;
• FPC exit position;
• connector clearance;
• cable bend radius;
• mounting support;
• sealing structure;
• front-panel stack thickness.

Temperature Range and Application Profiles

The module is specified for operation from −20°C to +70°C and storage from −30°C to +80°C. These values support evaluation for mobility and professional embedded products exposed to changing temperatures.

The values do not independently establish automotive qualification, outdoor certification, waterproofing, vibration resistance or UV durability.

Recommended evaluation profiles include:

• eBike ride-information dashboards;
• smart scooter consoles;
• mobility-system controls;
• protected auxiliary vehicle interfaces;
• smart exercise-equipment controls;
• circular appliance interfaces;
• compact equipment dashboards;
• smart-home rotary-style controllers.

For an eBike project, vibration, impact, ingress protection, sunlight exposure and power-transient requirements must be handled at complete-system level.

Procurement and Sample Approval

Before approving the 4 inch Circular G+G Capacitive Touch Screen, confirm the display, touch, optical and mechanical configuration as one complete assembly.

Procurement Checklist

• Native 720 × 720 framebuffer support
• Circular dashboard UI and safe area
• RGB pixel clock and timing
• RGB data width and mapping
• Complete LCD pin assignment
• Panel supply voltage
• Backlight voltage and current
• FL7707 configuration documentation
• CST3240 touch interface and pinout
• Touch-point requirement
• Glove-operation requirement
• Wet-finger and water-rejection requirement
• LCD drawing
• Combined CTP drawing
• Cover-lens artwork
• Dashboard opening and depth
• 300 cd/m² lighting suitability
• Operating and storage temperatures
• Vibration and impact requirements
• Ingress-protection target
• Sample quantity and qualification plan
• Annual demand and production schedule

Custom cover-lens graphics, FPC direction, interface mapping, bonding, brightness and mechanical adaptations are reviewed according to the requested project. Standard-module and sample quantities are confirmed separately.