eDP (Embedded DisplayPort) is a display interface standard defined by VESA (Video Electronics Standards Association) specifically for embedded DisplayPort applications. The A291803 signal module complies with the eDP 1.4a specification and supports expansion of up to four A291803 modules for simultaneous output. It enables 8K UHD (Ultra High Definition) video output, and when paired with the Chroma 2918 mainframe, it supports display testing at resolutions up to 8K (8192 × 4320) @120Hz, meeting the high-standard requirements for 8K image testing.
*VESA is Video Electronics Standards Association.
Compliant with the eDP 1.4a specification, the A291803 supports up to HBR3 transmission rates. It offers output through a maximum of 4+4 lane configuration, and provides eight selectable lane rates: 1.62 / 2.16 / 2.43 / 2.7 / 3.24 / 4.32 / 5.4 / 8.1 Gbps. Users can flexibly configure different resolutions and lane rates according to the testing requirements of the device under test (DUT), enabling versatile testing applications.。
For critical signal transmission testing, the A291803 offers a unique Manual mode in addition to the Automatic Link Training mode. It supports detailed configuration of parameters including AUX Handshake, Lane Count, Swing Level, and Pre-Emphasis:
- AUX Handshake：Full / Fast / No Training / Direct
- Lane Count：1 / 2 / 4 / 4+4 lanes
- Selectable Training table：Low / High /eDP1.3 Compatible / User Define
- Swing Level：200 / 250 / 300 / 350 / 400 / 450 / 600 / 800 / 1000 mV
- Pre-Emphasis：0 / 3.5 / 6 / 9.5 dB
The A291803 supports selection between color depths of 6, 8 and 10 bits for testing. For instance, with a 10-bit color depth, each primary color is divided into 1024 levels (210), allowing for approximately 1.07 billion different colors to be displayed (210 R × 210 G × 210 B). This enables you to customize your inspection application as needed.
Panel Self-Refresh (PSR) is a technology designed to reduce system power consumption by halting both image transmission and display updates when the system is in a static state, effectively extending battery life in mobile devices. For example, when a smartphone displays a static home screen, signal transmission stops, and the panel's internal memory autonomously refreshes the image. To achieve this function, both the transmitter and receiver must support PSR. The transmitter notifies the receiver via the Main Link (which controls image data) when a static frame is sent. The receiver then stores the frame in its internal memory and continues to display it through the RFB Controller, allowing the transmitter to stop sending image data. This process helps achieve energy savings and reduce overall device power consumption.
The latest generation, PSR2 (Panel Self-Refresh 2), further improves efficiency by supporting selective updates, refreshing only specific portions of the screen. The transmitter identifies the region that requires updating and notifies the receiver, so only that area is refreshed. This means the graphics processor only needs to send a minimal amount of updated data. PSR2 also supports Advanced Link Power Management (ALPM), which allows the receiver to quickly exit standby or sleep states as needed. With the A291803, users can precisely specify and position the target region to be updated for selective-update testing. (Optional)
The A291803 is equipped with VDD over-voltage protection (OVP) and over-current protection (OCP). Users can define custom protection threshold values, and if the voltage or current measured on the DUT exceeds the set limits during output, the protection mechanism will be triggered immediately to prevent damage. To avoid unintended triggering caused by inrush current during power-on, the module also includes a Protection Delay Time function, ensuring stable testing without interruption.。
The A291803 is equipped with under-voltage protection (UVP) and under-current protection (UCP) for the VDD supply. These features allow real-time monitoring to ensure that the voltage and current of the device under test do not fall below the user-defined thresholds from initialization through completion. This is particularly useful for identifying conditions such as components not reaching their operating range or abnormal circuit behavior at the lower limits.
Power, signal, and control pins can be activated independently, with user-defined timing adjustable in 1ms increments. Users can freely configure lead/lag timing for power, signal, and control outputs, including customized shutdown sequences.
ESD (Electrostatic Discharge) damage to electronic products has been an ongoing challenge to address. During regular use, ESD may cause instability and sudden functional anomalies. To avoid damage caused by ESD during IC production, A291803 features IEC/EN 61000-4-2 compliant ESD protection capability (15kV Air / 8kV Contact Discharge) and includes built-in ESD protection circuits, providing complete protection against ESD impact.
To support the development of thinner, lower-cost, and lower-power panels, VESA introduced MSO (Multi-SST Operation) in the eDP 1.4a specification. MSO is a display architecture designed for segment-based panel rendering, which divides the four high-speed eDP data lanes into 2 to 4 independent panel segments. The A291803 is capable of detecting whether the DUT outputs image signals conforming to the MSO standard format, and performs point-by-point verification to ensure correct display formatting. It supports three optional driving modes: (Optional)
- One Lane, Two SST Links each (1x2)
- Two Lanes, Two SST Links each (2x2)
- One Lane, Four SST Links each (1x4)
▲ One Lane, Two SST Links each (1x2)
▲ One Lane, Two SST Links each (1x2)
▲ One Lane, Two SST Links each (1x2)
To help users reduce testing time during panel production, the A291803, in compliance with eDP 1.4a and its MSO functionality, supports Overlap configuration from 0 to 8 pixels through the FPD Master software. Based on the user-selected pixel overlap value, the software automatically calculates and displays the corresponding Overlap Timing parameters, significantly reducing the time and effort required for manual computation. (Optional)
Supporting the latest variable refresh-rate technology, the A291803 leverages its high-speed refresh rate capability to verify whether the DUT functions properly under continuous image refresh conditions. It is equipped with four test modes: Saw, Ramp, Square, and Arbitrary. The standard modes (Saw / Ramp / Square) allow 1 to 50 steps with a time interval from 1 to 600 seconds, allowing flexible adjustment of the refresh rate. In Arbitrary Mode, up to 5 different periods can be set and switched dynamically, covering a comprehensive range of panel refresh rate testing requirements. (Optional)
▲ SAW
▲ Ramp
▲ Square
▲ Arbitrary
The A291803 is equipped with built-in temperature sensing that continuously tracks changes in the module’s internal temperature and reports them to the control unit. As the temperature rises, the fan automatically increases its speed; as it cools, the fan slows down. This smart adjustment optimizes airflow to reduce operating noise while maintaining ideal thermal performance, extending overall system longevity.
DSC (Display Stream Compression) technology enables compression of image streams at the transmitter side by encoding high-resolution image data for transmission over lower-bandwidth links. At the receiver side, the image data is decoded and restored for display. Leveraging visually lossless compression, DSC ensures that the decompressed image appears identical to the original, with no visible distortion on screen. (Optional)
Licensed by The Institute of Image Information and Television Engineers, a wide range of 8K Ultra-High Resolution color gamut test patterns are available. (Optional)
Applications: panel manufacturers, driver IC design, repair centers, PCB substrate testing, automated test equipment manufacturers, IC reliability testing, demonstration, product verification, etc.
Panel Manufacturer
Driver IC Design
Repair Center
PCB Substrate Testing
Automatic Testing
Equipment Manufacturer
IC Reliability Testing
Demonstration
Product Verification
