 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Microcontroller and PC projects : 8.8 inch super-wide displays - HSD088IPW1
| Author | Message | ||||
MustardMan Senior Member  Joined: 30/08/2019 Location: AustraliaPosts: 175 |
Hi, Does anyone have any experience with these? From a bit of research (not easy when all you get are amazon sites just selling) they are a Hannstar TFT LCD panel (1920x480) driven by an MIPI interface. From the Hannstar data sheet they look to be a 480 x 1920 display. Most ebay/amazon sellers offer a HDMI to MIPI adapter PCB that also takes a micro-USB (presumably the USB port only powers the backlight), and seem to be targeting embedded PC devices (like a raspPi) which have a HDMI display adapter. I am not up to speed on the MIPI interface other than it is looks like a fast differential variant of SPI or SQI (up to 4Gbps and 4 data lanes). Without ANY documented evidence either way, the LCD probably has no memory of its' own and relies entirely on the MIPI interface to feed it continuous data (ie: it has no frame buffer). I'm thinking if it was coupled with a decent frame buffer chip (like the SSD1963 but better) it would make for a nice display that gets away from the ho-hum 16:9 displays that now seem to be on *everything*. I am tempted to buy one and just have a probe - see those signals. Cheers, (PS: search ebay for "1920x480" or "HSD088IPW1" to see what they look like). Edited 2021-01-21 16:19 by MustardMan |
||||
lew247 Guru  Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
This is what I could find on it it seems it uses a HDMI to MIPI interface board and the power is got from the USB connector it's designed for use in car dashboards   |
||||
| MustardMan Senior Member Joined: 30/08/2019 Location: AustraliaPosts: 175 |
I would like to know what part number that HDMI/MIPI conversion chip is. I could then look it up for some juicy hardware details! Sadly all the pictures I've seen of that adapter PCB are so poor there is no chance of getting a part number from them. I searched for "stretched bar lcd" out of interest and got a plethora of hits with sizes and aspects ratios ranging from fairly ordinary to quite exceptional. But the prices make me shudder! I've seen such displays in a couple of shops, and they really do look impressive. Obviously those shops had a pretty good budget for spending on advertising gadgets! Cheers, |
||||
| Emady Newbie  Joined: 02/02/2016 Location: United KingdomPosts: 23 |
That is an interesting display indeed. A quick Google Search came up with this: DataSheet Hope it is of help. Cheers, Elia |
||||
| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10590 |
MIPI is not an iInterface specification. The MIPI organisation define 3 different I/Fs DSI, DPI, and DBI. DSI is the newest and there are two variants DPI over DSI and DBI over DSI The is also a physical I/F standard defined, the MIPI D-PHY Very good explanation here |
||||
| MustardMan Senior Member Joined: 30/08/2019 Location: AustraliaPosts: 175 |
@Emandy Yup, got that datasheet (but thanks anyway for posting as it will hopefully be of use to others). @matherp That presenter has a terrible accent! The presentation was quite good, although made by ST, naturally he only tells us that an ST part can do it and makes mention of no others. He does mention the 'older style' "LTDC" (LCD TFT Display controller) chip, which is essentially what an SSD1963 is. However, apart from pushing the STM32 parts, makes no mention of what a dedicated MIPI/DSI/DPI/DBI part might be called. Full points for only pushing your own product, but of no real help. I would have liked a phrase I could search on! An STM32 is a full micro, and what I want is a chip that incorporates a frame buffer (GRAM), with an interface to get data into it, and DSI port/s to drive a display. Guess I'll just have to start searching on random phrases... ... although one could just use an STM32 and write some code that implements a frame buffer, input interface & output interface... But that's more damn software (and more damn software toolchains and device programmers). Doh! Cheers, |
||||
| MustardMan Senior Member Joined: 30/08/2019 Location: AustraliaPosts: 175 |
An update... I will probably let this one fade away. Research over the last week has not been promising. A summary for those interested: I was fairly interested in the STM microcontrollers with integrated DSI. Despite using a different toolchain to the PIC stuff I had, the Colour Maximite is designed around an STM part, and I would have to get into that sooner or later... Of interest was the STM32F769/779 as that chip has a DSI host peripheral, and the CMM2 uses a STM32H743. Not too different. That datasheet refers to an application note that apparently specifically talked about the DSI peripheral: AN4860. Well, that was not that easy to find (I could not find it anywhere on the STM site, but maybe that's just me) and google was not too interested in helping out. I eventually found a copy after probably two or three hours of searching and following links to sites that promise everything and deliver nothing (except viruses). Anyway, it contains a *wealth* of information about DSI, and if you are into that, I recommend a read! However, its bandwidth is fairly low (500Mbps x2 ports), and from what I could determine the display is a 4 port device at up to 1Gbps per port. It might be drivable, but the refresh might be too slow. I've ordered a couple just to play with, but I think it will be an exercise in futility. OK, RGB to DSI... where the trouble started. Rare as hens teeth, and just as expensive. SSD2828 at $45 each. Datasheets almost don't exist. SSD2829 at $101 each. Datasheet even harder to find. SSD2848 with no datasheet (without asking SSD directly), and no sellers anyway. TC358778 in datasheet form only - I didn't find any sellers. OK, what about an FPGA solution. Xilinx do a 'free' IP core for an RGB to DSI for their UltraScale+ products. BGA only, and the number of "legs" would make any self-respecting centipede very jealous. Lattice also do a BGA (Crosslink), also a 'free' IP core, with as little as 64 balls, but they go up rapidly from there. At least the FPGA solution was not a stupid price, but there were a couple of newsgroup threads talking about just those 'cores', and they were apparently not easy to get going (ie: not workable). Maybe something to keep one busy once retired. Raspberry Pi with HDMI output -> HDMI to DSI -> LCD. Not an elegant solution, and not one I really feel like chasing. Oh well. PS: I would like to post the AN4860 application note, as it was not that easy to find, but at 14 Megs this forum won't let me. |
||||
| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10590 |
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjygYDA98DuAhURu3EKHdJQAM8QFjAAegQIAhAC&url=https%3A%2F%2Fwww.st.com%2Fresource%2Fen%2Fapplication_note%2Fdm00287601-dsi-host-on-stm32f469-479-stm32f7x8-x9-and-stm32l4r9-s9-mcus-stmicroelectronics.pdf&usg=AOvVaw0rE2y3J1UeEvtL184McPq7 Edited 2021-01-29 20:30 by matherp |
||||
| zeitfest Guru Joined: 31/07/2019 Location: AustraliaPosts: 622 |
(sob) saw one of these type in use.. mind popping !! I need wider eyeballs I think ! |
||||
| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4147 |
Annoyingly, STM do not just put the AN4860 as part of the actual file name but you can find it with a search like: stm32 an4860 pdf but even then you need to be willing to download a PDF with an odd-looking name. I don't know anything like enough about DSI to comment. John |
||||
| MustardMan Senior Member Joined: 30/08/2019 Location: AustraliaPosts: 175 |
@zeitfest I have a "moderately" wide curved LCD screen for work. I like the width for having multiple documents open, but am not sold on the curve. I have a flat screen of the same width, but a bit taller, on another PC, and it too is good for multiple documents. However, for PCB design (schematics & layout) the flat screen is much better to use - the extra area is what you need, not extra width. As for the curve, I believe it is meant to reduce eye strain (due to your eyes having to refocus from center to corner), but I can't say I've noticed any difference, and for me not worth the extra dollars. @matherp Thanks for posting that link. Once I found the datasheet I downloaded it and promptly forgot the download site, and I really didn't feel like trying to find it again. These days I try to do most things in a private window - I know it doesn't stop a lot of things, but I detest sites loading me up with cookies (and more and more of them do it). A private window erases cookies when closed. I did manage to find some SSD2828 for a respectable price in a QFN (but with MOQ of 9, plus shipping, the price went back up to around $100 anyway). I ordered some to play with as I don't feel so bad about blowing one up when I have another 8 to trash. Bit different when you've only got one, and it costs like and arm and most of a leg... Cheers, |
||||
 Print this page |
 |
The Back Shed's forum code is written, and hosted, in Australia. | © JAQ Software 2025 |
