3.4 Inch High Brightness Circular TFT Module for Compact Instruments

3.4 Inch High Brightness Circular TFT Module for Compact Instruments

A compact 800 × 800 normally-black circular display with 650 cd/m² typical luminance and four-lane MIPI video input for instrument-style interfaces.

Product Overview

The High Brightness Circular TFT Module gives instrument designers a compact round interface for measurement displays, equipment controls, audio dials and specialized status panels. Its 800 × 800 pixel format supports radial scales, centered values, warning rings and detailed icons within a 3.4-inch circular viewing area.

The active area measures 87.60 × 87.60 mm, while the complete module measures 95.20 × 97.20 × 2.13 mm. This compact envelope helps designers create instrument-style front panels without allocating space for a conventional rectangular display.

The standard configuration uses a four-lane MIPI video-mode interface and does not include touch. Its 650 cd/m² typical luminance is intended for applications that need stronger optical output than a basic indoor panel.

Key Specifications at a Glance

Circular 800 × 800 Interface Design

Circular Safe Area Within the Square Raster

The host generates an 800 × 800 square framebuffer even though the visible display is circular.

A circular 800 × 800 panel still uses a square pixel raster and needs a circular safe area.

Critical values, warning icons and controls should remain inside the approved visible boundary. Corner pixels can carry background artwork, but essential information should not depend on them because those regions may fall outside the circular opening.

The final safe area should be validated against the actual front cover, printed border and enclosure aperture.

Instrument and Gauge UI Layouts

The circular format works naturally with:

• central numeric readings;
• radial scales;
• progress arcs;
• operating-range indicators;
• warning rings;
• status icons;
• timer graphics;
• audio levels;
• equipment-mode selectors;
• battery or energy indicators.

An 800 × 800 canvas provides enough detail for smooth curves and readable graphical elements, but font size and information density should still be evaluated at the intended viewing distance.

High-Brightness Optical Performance

650 cd/m² Application Boundary

The display is specified at 650 cd/m² typical luminance. This supports evaluation in bright rooms, illuminated work areas and protected equipment installations where a lower-output panel may be difficult to read.

The 650 cd/m² rating does not guarantee readability in every direct-sunlight condition.

Final visibility depends on:

• front-cover transmission;
• reflections and glare;
• air gap or bonding structure;
• viewing angle;
• ambient illumination;
• enclosure shadowing;
• backlight operating conditions.

Evaluate a physical sample behind the proposed front assembly and under the target lighting before approving outdoor-facing use.

Normally Black Visual Presentation

The normally-black display mode is useful for interfaces built around dark backgrounds, luminous scales and colored warning graphics. It can provide a cleaner visual foundation for circular dials where inactive areas should visually merge with a dark bezel.

The panel supports 16.7M colors and an RGB vertical-stripe arrangement. These characteristics support gradients, icons and differentiated status colors without implying a particular host color-depth configuration.

Integrating the High Brightness Circular TFT Module

Four-Lane MIPI Video-Mode Qualification

The module uses a four-lane MIPI interface in video mode. This confirms the interface family and lane count, but not full host compatibility.

A four-lane MIPI label does not guarantee timing, voltage or pin compatibility.

Before releasing the PCB or FPC, confirm:

• native 800 × 800 timing;
• lane mapping;
• video-mode timing;
• clock requirements;
• D-PHY voltage conditions;
• complete pin assignment;
• connector pitch;
• contact orientation;
• reset and enable signals;
• panel logic supply;
• backlight supply and control.

A host that supports another four-lane MIPI panel should not automatically be assumed compatible.

Driver IC and Host-Control Boundaries

JD9365DA is the identified driver IC for this module. The part number alone does not establish the exact host initialization sequence, command set, register configuration or power sequence.

Request the approved electrical specification, timing data and any required initialization documentation before software and controller-board release.

The absolute-limit voltage figures should not be used as nominal supply values. Recommended panel and I/O operating voltages must be confirmed separately.

Mechanical and Environmental Integration

Active Area and Module Envelope

The circular active area is 87.60 × 87.60 mm. The complete module outline is 95.20 × 97.20 × 2.13 mm.

The mechanical design should distinguish among:

• active image diameter;
• circular visible opening;
• inactive border;
• complete module outline;
• FPC exit;
• connector clearance;
• cable bend radius;
• rear support area;
• bezel overlap;
• mounting pressure.

The approved mechanical drawing should control the enclosure release rather than the nominal 3.4-inch diagonal.

Wide-Temperature Qualification

The module is specified for operation from −30°C to +85°C and storage from −40°C to +90°C. These limits support evaluation for equipment exposed to broader temperature variation than ordinary indoor consumer displays.

Product-level validation must still consider:

• enclosure heat rise;
• backlight heat;
• humidity;
• condensation;
• vibration;
• shock;
• front-surface durability;
• electromagnetic compatibility;
• cable stress;
• power stability.

The temperature range does not establish a complete environmental certification.

Recommended Application Profiles

This module can be evaluated for:

• compact laboratory instruments;
• industrial gauge panels;
• audio and amplifier dials;
• equipment status indicators;
• smart appliance controls;
• access and security interfaces;
• test and service equipment;
• embedded measurement devices;
• specialized commercial terminals;
• compact control stations.

Comparable 3.4-inch round MIPI displays are also marketed for appliance controls, industrial control devices, audio interfaces and other circular embedded products.

Customization and Configuration Review

Project review may include:

• optional touch-panel integration;
• cover-lens graphics;
• FPC direction or length;
• MIPI mapping;
• brightness target;
• backlight drive;
• controller-board matching;
• air or optical bonding;
• front-panel adaptation;
• packaging.

Custom configurations are generally reviewed from 500 pieces, subject to tooling requirements, material availability and the requested specification. Sample and standard-module quantities are confirmed separately.

Procurement and Sample Approval

Before approving the High Brightness Circular TFT Module, confirm the host, UI, power, optical and mechanical requirements.

Procurement Checklist

• Native 800 × 800 framebuffer support
• Circular UI safe-area definition
• Four-lane MIPI video-mode support
• Complete lane and pin mapping
• Clock and timing requirements
• Connector pitch and contact orientation
• Recommended VDD and VDDIO values
• Reset and enable signals
• Backlight voltage and current
• Backlight control method
• Approved module drawing
• Circular opening diameter
• FPC exit and bend clearance
• 650 cd/m² lighting suitability
• Standard non-touch or custom touch version
• Cover-lens and bonding requirements
• Operating and storage environment
• Sample quantity
• Annual demand
• Production schedule
• Required compliance documents