Bar-type displays are designed for applications where a conventional rectangular display does not fit the available space or information layout. Their elongated form factor can be used in industrial equipment, vehicle dashboards, transportation systems, kiosks, and other applications that require a narrow or wide display area.
Unlike a standard display selected primarily by diagonal size, a bar-type display often starts with the available mechanical space and required active area. Then consider aspect ratio, resolution, interface, touch, cover glass, optical bonding, and environmental requirements together.
This guide explains what bar-type displays are, how they differ from stretch displays, where they are used, and which parameters to define when developing a customized solution.
What Is a Bar-Type Display?
A bar-type display is a display module with an elongated aspect ratio, typically much wider or narrower than conventional display formats such as 16:9 or 4:3.
The term describes the form factor of the display, rather than a specific LCD technology. A bar-type display can use different TFT LCD configurations, brightness levels, interfaces, touch technologies, and mechanical structures depending on the application.
In practice, the required shape is often determined by the equipment rather than by a standard display size. For example, a control panel may have limited vertical space but enough horizontal room for a long information area. A bar-type display can use that space more efficiently than a conventional rectangular module.
The display therefore needs to be specified by more than its diagonal size. Active area dimensions, aspect ratio, resolution, mounting dimensions, FPC position, and interface configuration can all be important.
Bar Type Display vs. Stretch Display
Bar type display and stretch display are often used interchangeably, but they can describe slightly different aspects of a display.
Bar type display generally emphasizes the physical elongated form factor. Stretch display usually emphasizes an unusually wide or extended aspect ratio compared with conventional display formats.
There is substantial overlap between the two terms. A custom TFT LCD with a very wide active area may be described as either a bar type display or a stretch display depending on the application and supplier.
The distinction is useful when discussing engineering requirements:
Bar type display: focuses on the physical shape and integration space.
Stretch display: focuses more on the extended aspect ratio and display format.
Custom display: describes the development approach and may include non-standard dimensions, interfaces, touch, cover glass, or other configurations.
A bar-type display is therefore not simply a conventional LCD that has been scaled wider. The display architecture, pixel arrangement, mechanical structure, and system integration may all need to be designed around the required form factor.
Why Use a Bar Type Display?
The main reason to use a bar type display is to match the display area to the equipment layout.
Common design situations include:
Limited installation height with sufficient horizontal space
Long and narrow control panels
Instrument clusters and dashboards
Equipment that needs to display information across a horizontal area
Interfaces designed around a specific machine or enclosure
Applications where several smaller indicators could be replaced by one integrated display
A custom aspect ratio can also allow the user interface to be designed around the available display area instead of forcing the mechanical design to accommodate a standard LCD.
However, an unusual aspect ratio should have a functional reason. If a standard display can meet the mechanical and interface requirements, a standard module may be simpler to source and integrate. Custom bar-type displays become more relevant when the required dimensions or interface cannot be met efficiently with standard formats.
Key Specifications When Selecting a Bar Type Display
The selection process should begin with the complete system requirements rather than the display diagonal alone.
Display Dimensions and Active Area
Define the available installation space first, including:
Overall module dimensions
Active display area
Bezel requirements
Mounting holes or fixing structure
Maximum thickness
FPC location and bending direction
For elongated displays, the relationship between active area and overall dimensions can have a significant effect on mechanical integration.
Aspect Ratio and Resolution
Aspect ratio determines how information is distributed across the display, while resolution determines the available pixel density.
The required resolution should be evaluated together with the physical active area. A higher pixel count is not automatically better if the content does not require it or if the display interface and system hardware cannot support the required signal.
For a custom bar-type display, the resolution may be selected specifically for the required aspect ratio rather than using a conventional 16:9 format.
Brightness and Viewing Conditions
Brightness should be selected according to the actual lighting environment.
Indoor industrial equipment may require a very different luminance level from a display installed in direct sunlight. Outdoor readability also depends on contrast, surface reflection, cover glass, optical treatment, and the complete display stack.
Therefore, specifying brightness alone is not enough to define outdoor readability.
Interface
The interface needs to match the host system and available electronics.
Common display interfaces include:
The appropriate interface depends on resolution, refresh requirements, system architecture, cable length, controller availability, and electrical design.
FPC configuration and connector position should also be considered during mechanical design rather than treated as an afterthought.
Operating Temperature
The required operating temperature should be defined from the actual installation environment.
Industrial equipment, vehicles, outdoor equipment, and enclosed systems can have very different thermal conditions. The LCD, touch components, adhesive materials, driver electronics, and other components should be evaluated against the required temperature range as a complete module.
Bar Type Touch Display
A bar type display can be combined with a projected capacitive (PCAP) touchscreen when direct user interaction is required.
The touch system may include:
The elongated shape introduces additional design considerations for the touch sensor and cover glass. Sensor geometry, controller tuning, cover-glass thickness, and the intended touch conditions all affect the final performance.
For industrial applications, requirements such as glove operation or wet touch should be defined during the touch design stage. They should not be assumed from the display dimensions alone.
Bar Type Display Resolution and Aspect Ratio
Aspect ratio is one of the defining characteristics of a bar type display.
For example, a display designed around a long horizontal information area may use a resolution such as 1920 × 480 or another application-specific format rather than a conventional 1920 × 1080 configuration.
The appropriate resolution depends on:
Available active area
Viewing distance
Information density
Graphics and text requirements
Host processor and GPU capability
Display interface bandwidth
Software and UI layout
For this reason, the resolution should be selected after the mechanical dimensions and content requirements are understood.
A display with a high pixel count but an unsuitable aspect ratio may still require unnecessary scaling or leave unused display area.
Applications of Bar Type Displays
Bar type displays are useful where the physical equipment or user interface benefits from an elongated display area.
Automotive and Transportation
Instrument panels, vehicle controls, passenger information systems, and other transportation interfaces may use elongated displays to fit available dashboard or control-panel space.
Industrial Equipment
Industrial machines can use bar-type displays for status information, machine controls, process indicators, and operator interfaces where vertical installation space is limited.
Railway and Transit Systems
Transportation equipment may require long display areas for route information, equipment status, or control interfaces.
Kiosks and Self-Service Equipment
A bar-type display can be integrated into a specific enclosure or information panel without requiring the entire system to follow a conventional display proportion.
Vending and Smart Equipment
Equipment manufacturers may use custom-shaped displays to match the physical layout of buttons, product areas, controls, or other user-interface elements.
The suitability of a bar type display depends on the actual mechanical and interface requirements of the equipment. The unusual aspect ratio should solve a real integration problem rather than simply provide a different appearance.
How to Customize a Bar Type Display
For a custom bar type display, it is generally more effective to start with the installation constraints and work toward the display configuration.
1. Define the Mechanical Space
Provide the available width, height, thickness, mounting structure, and FPC requirements.
2. Determine the Active Area
Define how much of the available space should be used for the visible display area.
3. Select Resolution and Aspect Ratio
Choose a resolution that matches the active area, viewing distance, content, and host system.
Specify brightness, contrast, viewing angle, LCD mode, operating temperature, and other optical requirements according to the application.
5. Define the Interface
Confirm the required interface, connector, FPC arrangement, signal requirements, and compatibility with the host electronics.
6. Add Touch and Cover Glass if Required
For touch applications, define sensor type, touch points, cover-glass thickness, surface treatment, glove or wet-touch requirements, and mechanical constraints.
7. Evaluate Optical Integration
Optical bonding may be considered when reflection control, image clarity, or mechanical integration is important. The bonding material and complete optical stack should be evaluated together with the display and cover glass.
8. Confirm Environmental Requirements
Define operating temperature, humidity, UV exposure, vibration, or other environmental conditions based on the actual installation.
This process helps avoid selecting a display first and discovering later that its dimensions, connector position, touch structure, or interface do not fit the system.
Bar Type Display: Standard or Custom?
A standard display is usually preferable when its dimensions, aspect ratio, interface, and performance already meet the application requirements.
A custom bar type display becomes more useful when the project requires:
Non-standard dimensions
Unusual aspect ratios
Specific mounting dimensions
Customized FPC or connector configuration
Integrated PCAP touch
Customized cover glass
Optical bonding
Special brightness or temperature requirements
Integration into an existing mechanical enclosure
The development effort should therefore be weighed against the value of achieving the required mechanical and functional fit.
FAQ
What is a bar type display?
A bar type display is an elongated display module designed for applications where a conventional display format does not fit the available space or interface layout. It can be configured with different LCD, touch, interface, and mechanical options.
Is a bar-type display the same as a stretch display?
The two terms overlap significantly. Bar type display generally describes the elongated physical form, while stretch display emphasizes an extended aspect ratio. In the display industry, the terms may be used interchangeably depending on the application.
Can a bar type display have a touchscreen?
Yes. A bar-type display can be integrated with a PCAP touchscreen, cover glass, touch controller, and optical bonding when the application requires touch interaction.
What resolution is suitable for a bar type display?
There is no single standard resolution. The appropriate resolution depends on the active area, aspect ratio, viewing distance, content, host system, and interface bandwidth.
Can bar type displays be customized?
Yes. Customization can include display dimensions, resolution, brightness, interface, FPC configuration, touch sensor, cover glass, optical bonding, and environmental specifications.
Conclusion
Bar-type displays provide an alternative when conventional display formats do not match the mechanical or interface requirements of a product. Their elongated form factor can be useful for industrial equipment, transportation systems, automotive interfaces, kiosks, and other specialized applications.
The key to selecting a bar-type display is to evaluate the complete system rather than focusing only on aspect ratio or diagonal size. Mechanical dimensions, active area, resolution, interface, touch, optical structure, and environmental requirements should be defined together.
For projects requiring a non-standard display format, early coordination between the display, touch, mechanical, and electronic requirements can reduce integration problems during development.
