►Size : 3.99 inch
►Resolution : 400*960 dots
►View Direction : IPS
►Interface : RGB
►Brightness (cd/m²): 350
►DatasheetPlese contact service
The 4-inch 400×960 RGB/MIPI IPS Bar Type LCD Display is a narrow, elongated TFT LCD module designed for embedded equipment, smart control systems, industrial interfaces, access control terminals, kiosks, instrumentation, and other products where conventional rectangular displays cannot efficiently use the available installation space. With a 3.99-inch display size, 400×960 resolution, IPS viewing performance, 350 cd/m² brightness, and compact 42.9 × 102.08 × 2.25 mm mechanical dimensions, this bar-type LCD provides a practical display solution for space-constrained product designs.
The product model is DBC040BVN40R035A. It uses a-Si TFT technology, Normally Black display mode, 16.7M colors, and an ST7701S LCD driver IC. The module features a 3SPI + 18-bit RGB interface with connector connection, allowing engineers to integrate the display with suitable embedded processors and controller architectures. Its active area is approximately 39.18 × 94.032 mm, providing a relatively large visual area within a slim and vertically oriented form factor.
For OEM and ODM projects, Aptus Display also supports customization of brightness, PIN definition, cover glass, touch panel, driver board and other display-related components. This makes the module suitable not only as a standard TFT LCD but also as a starting point for customized display assemblies.
3.99-inch bar-type TFT LCD
400 × 960 pixel resolution
IPS / full-view display
RGB interface with SPI control
3SPI + 18-bit RGB configuration
350 cd/m² rated brightness
16.7M color depth
Normally Black display mode
ST7701S LCD driver IC
39.18 × 94.032 mm active area
42.9 × 102.08 × 2.25 mm LCM dimensions
8-LED backlight
2.8–3.6 V power voltage
Typical 50 mA supply current at 2.8 V
1000–1500 contrast ratio at 0°
Approximately 80% brightness uniformity
65% NTSC color gamut
-20°C to +70°C operating temperature
-30°C to +80°C storage temperature
Optional touch panel, cover glass and driver board customization
The manufacturer's product page specifically identifies this model as a 4-inch 400×960 RGB Bar Type LCD Display and lists IPS viewing, RGB interface and 350 cd/m² brightness as its primary product specifications.
| Parameter | Specification |
|---|---|
| Product Type | Bar Type TFT LCD Display |
| Model Number | DBC040BVN40R035A |
| Display Size | 3.99 Inch |
| Resolution | 400 × 960 dots |
| Display Technology | a-Si TFT |
| Display Mode | Normally Black |
| Viewing Direction | IPS / Full View |
| Interface | RGB |
| Detailed Interface | 3SPI + 18-bit RGB |
| Driver IC | ST7701S |
| Color Depth | 16.7M |
| Brightness | 300–350 cd/m², typically 350 cd/m² |
| Contrast Ratio | 1000–1500:1 at 0° |
| Active Area | 39.18 × 94.032 mm |
| LCM Dimensions | 42.9 × 102.08 × 2.25 mm |
| Pixel Pitch | 32.65 × 97.95 μm |
| Backlight | 8 LEDs |
| Brightness Uniformity | Approx. 80% |
| NTSC Color Gamut | Approx. 65% |
| Response Time | TON approximately 30–40 ms |
| Power Voltage | 2.8–3.6 V |
| Typical Supply Current | 50 mA at 2.8 V |
| Touch Panel | Optional / Customizable |
| Cover Glass | Optional / Customizable |
| Driver Board | Optional / Customizable |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Typical Applications | Embedded, industrial, smart control, kiosk and instrumentation |
Specifications are based on the product information currently published by Aptus Display. Engineering teams should request the latest datasheet and confirm final electrical, optical and mechanical specifications before mass production.
A conventional TFT LCD normally uses a relatively wide rectangular aspect ratio. This can become a problem when the host product has a narrow front panel, vertically oriented enclosure or limited installation area.
A bar-type LCD display solves this mechanical problem by using an elongated display structure.
The 400×960 resolution provides a substantially taller pixel area than many conventional compact LCD formats. This makes the display suitable for vertically organized graphical interfaces, numerical information, icons, menus, status indicators and operating instructions.
The physical dimensions of approximately 42.9 mm wide and 102.08 mm long allow product designers to integrate the display into narrow front panels without allocating the space required by a conventional 4-inch rectangular LCD.
This type of display can be particularly valuable when the industrial design of the product requires a long, narrow visual interface.
Instead of changing the product enclosure to accommodate a standard display, engineers can design the user interface around the bar LCD's native aspect ratio.
The 400×960 pixel resolution provides a 2.4:1 pixel ratio, creating a tall visual area that is well suited to vertically structured interfaces.
For example, a smart access-control terminal could display:
User instructions
Authentication status
Icons
QR or barcode information
System messages
Access permissions
An industrial device could use the same display to show:
Measurement values
Machine status
Alarm notifications
Operating parameters
Diagnostic information
For embedded product designers, the 400×960 resolution also provides greater flexibility when creating customized UI layouts compared with low-resolution character displays or simple status indicators.
The module uses IPS viewing technology and is specified with full-view viewing characteristics. This is an important consideration for products that may be viewed from different positions.
A display installed on a vertical access terminal, industrial machine or compact control panel may not always be viewed directly from the center.
Users may approach from the side, stand above or below the device, or interact with the product while moving.
Wide viewing performance helps maintain consistent image visibility and supports a better user experience across different viewing positions.
The module is also specified with full-direction gray-scale inversion characteristics, helping maintain consistent display behavior from different viewing directions.
The DBC040BVN40R035A uses a 3SPI + 18-bit RGB interface configuration. This architecture provides an integration option for embedded systems that are designed to drive RGB TFT displays.
The display incorporates an ST7701S driver IC, which handles display control functions within the module architecture.
When selecting an LCD for an embedded project, engineers should evaluate more than simply whether the interface name matches.
Important integration considerations include:
Host processor compatibility
RGB timing
SPI initialization
Display orientation
FPC and connector configuration
Power supply
Backlight driving
Driver IC initialization sequence
PCB layout
EMI/ESD requirements
Firmware support
Aptus can assist customers in evaluating the display interface and controller-board requirements when integrating the LCD into a new product.
The module measures approximately 42.9 × 102.08 × 2.25 mm, with an active display area of approximately 39.18 × 94.032 mm.
This compact bar-shaped structure allows designers to use the display in applications where width is restricted.
However, engineers should evaluate the complete mechanical assembly rather than considering the LCD dimensions alone.
Before finalizing the enclosure, it is recommended to consider:
Display opening
Bezel width
FPC bending area
Connector position
PCB clearance
Mounting method
Cover lens thickness
Touch-panel stack-up
Optical bonding thickness
Backlight clearance
Thermal management
For customized OEM projects, Aptus can evaluate the mechanical requirements and discuss modifications to the FPC, cover glass, touch panel and other components.
The display is specified with brightness in the 300–350 cd/m² range, with the primary product specification listed at 350 cd/m².
This brightness level can be suitable for many indoor environments, including:
Industrial equipment
Indoor kiosks
Smart access systems
Building control equipment
Smart-home devices
Embedded instrumentation
Retail equipment
Brightness requirements should always be determined according to the actual ambient-light conditions.
If the display will be installed outdoors or exposed to direct sunlight, 350 nits may not provide sufficient sunlight readability. In such cases, a higher-brightness LCD, anti-reflective treatment, optical bonding and customized cover glass may need to be evaluated.
Aptus can customize display brightness for projects with different optical requirements.
The module supports 16.7 million colors, providing sufficient color depth for graphical user interfaces, icons, images, status indicators and other visual content.
The product specification also lists approximately 65% NTSC color gamut and approximately 80% brightness uniformity.
Brightness uniformity is particularly important when the display is used to show large areas of the same color or high-contrast graphics. A more consistent backlight helps reduce visible differences between different portions of the display.
The 8-LED backlight structure is designed to provide consistent illumination across the active area.
The module operates with a specified power voltage range of 2.8–3.6 V, with a typical supply current of approximately 50 mA at 2.8 V.
For embedded product developers, these electrical characteristics should be considered together with the host board's power architecture and backlight power requirements.
The specified operating temperature range is -20°C to +70°C, while the storage range is -30°C to +80°C.
The product page also states that the bar LCD undergoes environmental and reliability testing, including high- and low-temperature operation and storage, high-temperature/high-humidity storage, thermal shock, ESD, vibration and shock testing.
For projects requiring formal qualification, customers should request the relevant test documentation and acceptance criteria from Aptus before production.
Access control devices often have narrow vertical housings because they need to accommodate cameras, card readers, fingerprint sensors, NFC modules and other components.
A 4-inch bar LCD can provide a dedicated visual interface without requiring a wide front panel.
It can display authentication instructions, user status, access permissions, system notifications and other information.
Smart door locks and entrance-control products can benefit from elongated displays because their mechanical design is generally narrow.
The display can be used for:
PIN entry
User instructions
Battery status
Lock/unlock notifications
Authentication messages
Configuration menus
A customized touch panel can be integrated when direct interaction is required.
Industrial instruments and compact controllers often require a display but cannot accommodate a large HMI panel.
The 400×960 bar LCD can provide a graphical interface for machine status, measurements, alarms and operating parameters.
Its -20°C to +70°C operating range also supports a variety of controlled industrial environments.
Vending machines, ticketing terminals and self-service devices can use a narrow display to provide instructions, product information, prices, menus and user prompts.
The elongated format can be incorporated into a customized front panel while leaving additional space for physical controls or mechanical components.
Smart-home controllers often need a compact display with a distinctive industrial-design appearance.
The 400×960 format can be used for vertical menus, home automation controls, device status, environmental data and notification interfaces.
Portable instruments, testers and measuring equipment can use the display to present numerical readings, graphical information, alarms and configuration menus.
The narrow format is especially useful when the overall enclosure is designed around a handheld or vertically oriented structure.
The bar LCD format can also be used for specialized retail information systems where a conventional rectangular display is too large or does not match the product's physical architecture.
Potential applications include narrow product-information displays, smart shelving interfaces and specialized promotional equipment.
Aptus Display provides customization options for customers whose product requirements go beyond the standard module.
The manufacturer specifically indicates that brightness, PIN definition, cover glass, touch panel and driver board can be customized.
Depending on project requirements, customization may include:
Higher or lower brightness configurations can be evaluated according to ambient lighting and power requirements.
A capacitive or resistive touch panel can be integrated for interactive applications.
The cover glass can be developed according to the mechanical design, appearance and protection requirements of the final product.
FPC shape, routing and connector positioning can be evaluated to match the host PCB.
A customized controller or driver board can be developed when the customer's processor cannot directly interface with the LCD.
For applications requiring improved optical performance, optical bonding can be evaluated as part of the complete display assembly.
The pin configuration can be adjusted according to the project architecture, subject to engineering evaluation.
These options allow OEM customers to develop a display assembly that is better matched to their enclosure, electronics and user interface.
A bar-type TFT LCD is a precision electronic component and should be handled carefully throughout development, assembly and transportation.
The manufacturer recommends avoiding mechanical shock and excessive force. LCD modules should also be stored appropriately, away from direct sunlight and harmful gases, while appropriate ESD precautions should be followed during handling and assembly.
For production environments, engineers should establish appropriate ESD protection, FPC handling procedures, clean assembly conditions and mechanical installation tolerances.
These practices help reduce the risk of display damage during product assembly.
Aptus Display, operated by Shenzhen Aptus Technology Co., Ltd., provides LCD display solutions for customers developing specialized electronic and embedded products.
The company offers TFT LCD modules, bar-type LCD displays, touch-panel LCD modules, wide-temperature displays, flight simulator displays, gaming display solutions and related LCD accessories.
For customized display projects, Aptus provides engineering support covering display customization, touch-panel integration, controller boards and other related display components. The company's product portfolio also includes a dedicated Bar Type LCD Display category covering multiple elongated display sizes and interface configurations.
This product-family approach is useful for OEM customers because the appropriate display size can be selected according to the available mechanical space rather than forcing a product design to use a conventional display ratio.
Aptus also provides project support from specification discussion through sample development, customization and production.
For customers developing a new product, it can be more efficient to discuss the complete display requirement—including LCD, touch panel, cover glass, FPC, driver board and mechanical integration—with one display supplier.
A 4-inch bar LCD is an elongated TFT LCD designed for products with narrow or vertically oriented installation spaces. Unlike a conventional rectangular LCD, its long and narrow structure allows designers to use the available front-panel space more efficiently.
The DBC040BVN40R035A provides a 400×960 pixel resolution, making it suitable for vertically oriented graphical interfaces, menus, status information, icons and embedded applications.
The product is listed with an RGB interface. The detailed specification identifies the configuration as 3SPI + 18-bit RGB. Engineers should confirm the final pin definition and interface configuration against the latest datasheet before hardware development.
Yes. The product is specified with IPS viewing performance, with full-view characteristics designed to maintain consistent visual output from different viewing directions.
The product page lists 350 cd/m² as the primary brightness specification, while the detailed optical specification indicates a brightness range of approximately 300–350 nits.
Yes. Aptus states that the touch panel can be customized. Capacitive or resistive touch solutions can be evaluated according to the customer's application and mechanical requirements.
Yes. Brightness customization is explicitly listed as an available option. Customers should provide the target brightness and application environment when requesting a quotation.
The published product-family specification lists -20°C to +70°C operating temperature and -30°C to +80°C storage temperature for this model.
Yes. For OEM projects, FPC structure and connector requirements can be discussed with the engineering team. The exact feasibility depends on the required mechanical and electrical configuration.
Yes. Driver-board customization is listed among the available options. The appropriate controller solution depends on the customer's host processor, interface and system architecture.
The standard 350-nit configuration is generally better suited to indoor or controlled-lighting environments. Outdoor applications should be evaluated separately, particularly where direct sunlight is present. Aptus can discuss higher-brightness and optical-enhancement options for demanding outdoor projects.
The 4-inch 400×960 RGB/MIPI IPS Bar Type LCD Display provides an effective solution for OEM products that require a narrow, vertically oriented visual interface. With its 400×960 resolution, IPS viewing performance, 350 cd/m² brightness, 3SPI + 18-bit RGB interface, ST7701S driver IC and compact 42.9 × 102.08 × 2.25 mm structure, the module is well suited to embedded systems, access control, smart-home equipment, industrial instrumentation, kiosks and specialized control interfaces.
If your existing product design requires a different display configuration, Aptus can evaluate requirements for:
Custom brightness
Custom FPC
Custom PIN definition
Capacitive touch panel
Resistive touch panel
Cover glass
Optical bonding
Driver/controller board
Interface adaptation
Mechanical integration
When requesting a quotation, provide the required display size, resolution, interface, brightness, application, estimated quantity, operating temperature, touch requirement and mechanical constraints.
Providing these details at the beginning of the project helps the engineering team evaluate compatibility and recommend an appropriate display solution.
Shenzhen Aptus Technology Co., Ltd. specializes in LCD display solutions, custom TFT LCD modules and related display components. Aptus provides standard and customized displays for customers developing embedded equipment, industrial systems, commercial products and specialized electronic devices.
The company combines LCD product development with customization capabilities covering touch panels, cover glass, FPCs, driver boards and related display accessories.
For projects requiring a compact 400×960 bar LCD display, Aptus can provide technical consultation, samples, customization evaluation and production support.
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