What are the alternatives to dual screen HDMI to MIPI DSI adapter?
1. Direct MIPI DSI Connection from the SoC
Many system-on-chips (SoCs) already have native MIPI DSI outputs. For example, the Raspberry Pi Compute Module 4 (CM4) has two DSI lanes (though only one is typically broken out). If you’re using a CM4, you can skip the HDMI step entirely and connect a DSI panel directly via a ribbon cable. The bandwidth here is about 1 Gbps per lane, with up to 4 lanes, giving you 4 Gbps total. That’s enough for a 1080p display at 60 Hz with 24-bit color. But the catch is that the connector pitch (usually 0.5 mm or 0.3 mm) and pinout are not standardized across panels. You’ll need a custom FPC cable or a breakout board. This approach eliminates the latency from HDMI encoding (which adds roughly 1-2 frames of delay) and reduces power draw by about 200-300 mW compared to using an adapter.
3. LVDS-to-MIPI Bridge Chips
If your source outputs LVDS (common in industrial displays or older laptops), you can use a bridge chip like the TI SN65DSI83 or Renesas RAA278842. These chips convert LVDS signals (which are parallel, typically 18-bit or 24-bit) into MIPI DSI. The SN65DSI83 supports up to 1080p at 60 Hz over 4 DSI lanes. The power consumption of the bridge itself is around 150 mW. But you need to ensure the LVDS clock frequency matches the DSI lane rate. For example, a 720p LVDS signal at 40 MHz pixel clock translates to about 400 Mbps per DSI lane. This is a niche solution—most consumer devices don’t output LVDS anymore, but it’s common in automotive and medical gear.
4. USB-C to MIPI DSI Adapters
USB-C can carry DisplayPort signals (via Alt Mode), and there are adapters like the Waveshare USB-C to MIPI DSI that convert DisplayPort to DSI. These use a chip like the Analog Devices ADV7535. The ADV7535 supports up to 1080p at 60 Hz over 4 DSI lanes. The USB-C connector is more robust than HDMI micro connectors, and the cable can carry power (up to 100W PD). But the latency is similar to HDMI—about 1-2 frames because of the DisplayPort-to-DSI conversion. The power draw is about 400 mW for the bridge chip alone. This is a good option if your source is a laptop or a phone with USB-C DP Alt Mode, but you lose the dual-screen capability that a dedicated dual screen hdmi to mipi dsi adapter offers.
5. Parallel RGB to MIPI DSI Bridge
Some microcontrollers (like the ESP32-S3) output parallel RGB data (typically 16-bit or 18-bit). You can use a bridge like the ITE IT66121 to convert that to MIPI DSI. The IT66121 supports up to 1080p at 60 Hz. The parallel RGB interface runs at a pixel clock of up to 85 MHz, which translates to about 850 Mbps per DSI lane (using 4 lanes). The bridge consumes about 200 mW. This is useful for low-cost MCU projects, but the parallel RGB traces on the PCB must be length-matched to within 50 ps to avoid skew. That’s a layout challenge.
6. FPGA-Based MIPI DSI Transmitters
If you need custom timing or non-standard resolutions, an FPGA like the Lattice CrossLink-NX or Xilinx Artix-7 can generate MIPI DSI signals from any input (HDMI, LVDS, parallel RGB). The CrossLink-NX has dedicated DSI PHY blocks that support up to 1.5 Gbps per lane. You’ll need to write Verilog or VHDL to handle the video timing and packetization. The power draw is higher—about 1-2W for the FPGA plus external DDR memory for frame buffering. The latency can be as low as 1 line (if you bypass frame buffering) or as high as 1 frame (if you use a buffer for scaling). This is overkill for most projects, but it’s the only way to drive a 4K DSI panel (3840x2160 at 60 Hz requires 12 Gbps total, which needs 4 lanes at 3 Gbps each—something most dedicated bridge chips can’t do).
7. Wireless Display Streaming (Wi-Fi Direct + MIPI DSI)
This is a stretch, but you can use a module like the ESP32-S3 with a GC9503CV MIPI DSI controller to receive video over Wi-Fi. The ESP32-S3 can decode JPEG frames in hardware and push them to the DSI panel at up to 30 fps for 480p. The bandwidth over Wi-Fi is about 150 Mbps (real-world), which limits resolution to 720p at 15 fps. Latency is around 100 ms. This is only viable for low-res, low-fps applications like a smart mirror or a status display. Power consumption is about 500 mW for the ESP32 plus the DSI panel.
8. HDMI to eDP (Embedded DisplayPort) Then eDP to MIPI DSI
Some panels use eDP internally, and you can find eDP-to-MIPI bridge chips like the Parade PS8625. The PS8625 converts eDP (which is a packetized serial interface) to MIPI DSI. It supports up to 1920x1200 at 60 Hz. The eDP interface uses a main link of 1.62 Gbps or 2.7 Gbps per lane (2 or 4 lanes). The bridge consumes about 300 mW. This adds another conversion step, so the total latency is about 3-4 frames (HDMI to eDP, then eDP to DSI). It’s a convoluted path, but it works if you have an eDP panel lying around.
9. Using a Raspberry Pi as a DSI Controller
If you have a Raspberry Pi (any model with a DSI connector, like the Pi 4 or Pi 5), you can use it to drive a DSI panel directly. The Pi’s GPU (VideoCore VI on Pi 4) can output 1080p at 60 Hz over DSI. You can then feed the Pi an HDMI input via the CSI-2 port using a TC358743 HDMI-to-CSI-2 bridge chip. That chip converts HDMI to CSI-2 (camera interface), which the Pi can then route to the DSI output. The TC358743 supports up to 1080p at 60 Hz. The total latency is about 2-3 frames because of the CSI-2 pipeline. This is a hacky solution but works for prototyping. Power draw is about 5W for the Pi plus the panel.
10. Dedicated Display Controllers with MIPI DSI Output
Chips like the FTDI FT813 or Solomon SSD1963 have built-in MIPI DSI outputs. The FT813 supports up to 800x480 at 60 Hz. These are typically used in small embedded displays. They take in parallel RGB or SPI data and output DSI. The FT813 consumes about 100 mW. The downside is the limited resolution—most of these controllers cap at 800x480 or 1024x600. They’re not suitable for high-res panels.
11. Using a DSI Multiplexer or Switch
If you need to switch between multiple DSI sources to one panel, you can use a multiplexer like the TI TS3DS26212. This is a 2:1 DSI mux that supports up to 1.5 Gbps per lane. It’s a passive switch (no conversion), so latency is negligible (picoseconds). The power draw is about 10 mW. This doesn’t replace the HDMI-to-DSI conversion, but it lets you share a panel between two DSI sources (e.g., a Pi and an FPGA).
12. Optical HDMI to MIPI DSI (Fiber Optic)
For long-distance runs (over 10 meters), you can use an HDMI optical cable (like the Ruipro 4K fiber optic HDMI) and then convert the optical signal to MIPI DSI using a standard HDMI-to-DSI adapter. The optical cable adds no latency (speed of light), but the adapter still adds 1-2 frames. The cable can run up to 100 meters without signal degradation. This is overkill for desktop use but useful for digital signage or automotive applications where the display is far from the source.
13. Using a DisplayPort to MIPI DSI Bridge (DP Alt Mode)
USB-C’s DP Alt Mode can be directly converted to MIPI DSI using a chip like the Parade PS8640. The PS8640 supports up to 4K at 30 Hz (or 1080p at 60 Hz) over 4 DSI lanes. It consumes about 250 mW. This is similar to the USB-C adapter but without the USB-C connector—just a DP cable. The advantage is that DP can carry audio, which HDMI can’t easily do when converted to DSI (most DSI panels don’t have audio).
14. Custom PCB with a Bridge Chip
If you’re designing a product, you can integrate an HDMI receiver (like the Analog Devices ADV7611) and a DSI transmitter (like the TI SN65DSI85) on a single PCB. The ADV7611 supports up to 1080p at 60 Hz and costs about $8 in volume. The SN65DSI85 supports dual DSI interfaces (for two panels) and costs about $5. The total BOM cost is around $20, plus PCB fabrication. This gives you full control over the layout, power sequencing, and signal integrity. The latency is about 1 frame (from the HDMI receiver’s internal buffer). This is the most flexible alternative, but it requires PCB design skills and EMI testing.
15. Using a Smartphone Mainboard as a DSI Source
Many smartphone SoCs (like the Qualcomm Snapdragon 8 series) have native DSI outputs. You can repurpose an old phone mainboard to drive a DSI panel. The Snapdragon 865 supports up to 4K at 60 Hz over DSI. You’ll need to extract the DSI signals from the board (usually on a flex connector). This is a salvage approach and requires reverse-engineering the pinout. The power draw is about 3W for the mainboard alone. This is not practical for most people but is a viable alternative if you have a dead phone and a DSI panel.
16. MIPI DSI over Coax (A-PHY)
For automotive use, the MIPI A-PHY standard allows DSI signals over a single coaxial cable up to 15 meters. Chips like the Valens VA7000 convert DSI to A-PHY. The VA7000 supports up to 4K at 60 Hz. The latency is about 1 microsecond (negligible). This is a specialized alternative—you won’t find these chips in hobbyist shops, but they’re used in ADAS and infotainment systems.
17. Using a Display Controller with Built-in HDMI Input
Some display controllers, like the Renesas R-Car D3 or NXP i.MX8, have HDMI inputs and MIPI DSI outputs built into the SoC. The R-Car D3 supports up to 1080p at 60 Hz input and output. The power consumption is about 2W for the SoC. This is a system-level solution—you’re essentially building a mini computer around the display. It’s overkill for a simple adapter but gives you processing power for scaling, overlays, and touch input.
18. Using a FPGA with a Soft MIPI DSI PHY
If you don’t have a hard DSI PHY on your FPGA, you can use a soft PHY implemented in logic. The Lattice iCE40 UltraPlus has a soft DSI PHY that runs at up to 400 Mbps per lane. This is enough for 480p at 60 Hz. The power draw is about 50 mW for the FPGA. This is a low-cost alternative ($10 FPGA) but requires careful timing closure. The latency is about 1 line (if you don’t buffer frames).
19. Using a Raspberry Pi Pico with a DSI Panel
The RP2040 (on the Pi Pico) doesn’t have a DSI interface, but you can bit-bang DSI at low speeds using the PIO (programmable I/O) blocks. The PIO can generate DSI signals at up to 10 Mbps per lane. This is enough for a 320x240 panel at 15 fps. The power draw is about 50 mW. This is a proof-of-concept alternative, not a production solution. You’ll need to write PIO assembly to handle the DSI packet format.
20. Using a DSI to HDMI Converter (Reverse Direction)
If you already have a DSI panel and want to drive it from an HDMI source, you can use a DSI-to-HDMI converter (like the Renesas RAA278842 in reverse). But that’s just a different flavor of the same problem. The point is that the conversion is symmetric—you can go either direction with the same chipset.
Each alternative has a specific niche. If you need dual-screen output, the dual screen hdmi to mipi dsi adapter is still the most straightforward option because it handles the HDMI decoding and DSI encoding in one package, with dual outputs. But if you’re okay with a single screen, or if you have a different source interface, one of the above might save you cost, power, or latency.