Kyocera KCB104VG2BA-A21 10.4″ VGA Industrial CSTN LCD Module: Specs & Integration Guide
Kyocera KCB104VG2BA-A21 10.4″ VGA Industrial CSTN LCD Module
The Kyocera KCB104VG2BA-A21 is a 10.4-inch Color Super Twisted Nematic (LCD core technology) passive matrix display designed for industrial automation platforms. Engineered to deliver dependable 640×480 VGA graphic rendering, this panel provides a proven optical architecture for mission-critical machinery retrofits and legacy human-machine interfaces.
- Core Specifications: 10.4-inch Diagonal | 640 × 480 (VGA) Resolution | Dual CCFL Backlight
- Engineering Value: Direct physical compatibility with legacy instrumentation and straightforward digital parallel driving.
- Integration Solution: Resolves replacement challenges in older programmable logic displays without requiring controller ASIC redesigns.
Technical Architecture and Signal Operation
The KCB104VG2BA-A21 utilizes a passive matrix CSTN liquid crystal stack driven via high-density column and row ICs. Operating at a native 4:3 aspect ratio, the active area measures 211.2 mm × 158.4 mm with a 0.33 mm dot pitch. Passive matrix operation relies on continuous Root-Mean-Square (RMS) voltage threshold control across scanning electrodes.
To conceptualize CSTN drive dynamics, imagine a grid of analog memory valves: maintaining the proper liquid crystal alignment requires precise voltage timing across rows and columns to prevent unintended optical bleed into adjacent pixels. Generating the necessary liquid crystal bias demands a dedicated negative driving voltage ($V_{EE}$), which allows system designers to tune panel contrast over temperature variations.
Illumination is powered by an edge-lit dual Cold Cathode Fluorescent Lamp (CCFL) assembly, providing uniform luminance across the active surface. Engineers managing legacy display retrofits often compare this design with related models such as the Kyocera KCB104VG2BA-A01 to evaluate connector pinouts and backlighting power requirements. Proper optical maintenance also benefits from understanding root causes detailed in industrial LCD failure analysis.
Optimized Application Scenarios
- CNC and Machine Tool Consoles: Direct mechanical drop-in for legacy industrial machine tools requiring standard VGA parallel digital data.
- Plastic Injection Molding Interfaces: Proven resilience to continuous factory floor operation within standard ambient enclosures.
- Factory Automation Control Terminals: Ideal match for sustaining operational uptime in smart factory HMI installations without software stack redesign.
The KCB104VG2BA-A21 provides verified mechanical and electrical compatibility for sustaining legacy 10.4-inch VGA industrial control hardware.
Key Technical Specifications
| Parameter | Specification Value | Unit / Condition |
|---|---|---|
| Optical & Display Parameters | ||
| Display Technology | Color STN (Passive Matrix) | Transmissive |
| Active Screen Size | 10.4 (26 cm diagonal) | Inches |
| Resolution | 640 × 480 (VGA) | RGB Stripe |
| Active Area | 211.2 × 158.4 | mm |
| Electrical Ratings | ||
| Logic Supply Voltage ($V_{DD}$) | 5.0 (typ.) | V |
| LCD Driving Voltage ($V_{EE} – V_{SS}$) | -22.0 to -26.0 (contrast adjustable) | V |
| Backlight System | Dual CCFL Tubes | Requires Inverter |
| Mechanical & Environmental | ||
| Module Outline Dimensions | 264.0 × 193.0 × 8.5 | mm |
| Operating Temperature | 0 to +50 | °C |
| Storage Temperature | -20 to +60 | °C |
Frequently Asked Questions
What type of interface is used on the KCB104VG2BA-A21?
The module uses a parallel digital interface designed to accept scan data, line pulse, frame pulse, and pixel clock signals directly from dedicated graphic display controllers.
How is contrast adjusted on this passive matrix CSTN panel?
Contrast is controlled by adjusting the negative voltage level ($V_{EE}$) supplied to the liquid crystal drive circuitry, which compensates for ambient operating temperature shifts.
What power source is required for the backlight?
The dual CCFL backlights require an external high-voltage AC inverter that steps up low-voltage DC (typically 12V) to the appropriate lamp strike and starting voltages.
The Kyocera KCB104VG2BA-A21 serves as a dependable replacement module that enables maintenance engineers and system integrators to keep installed industrial machinery operating reliably without requiring complete platform redesigns.