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LC datasheet & applicatoin notes – Datasheet Archive
LC Sanyo Semiconductor Corporation
Sceadwian Banned Feb 8, The LC and LC are often driven by a controller, like the Epson to reduce off-board workload. I know this board includes four, LC’s and three, LC’s.
I have seen boards similar to this one, that have traces for, but do not include the Does anyone know what the back of this board looks like? Does it have an additional controller and perhaps RAM or negative voltage power source? Sceadwian Banned Feb 9, I can find links to the LCD drivers, not anything useful for the Epsonwhat are you talking about? Please provide reference to this type of display being used with an on board controller.
Blueteeth Well-Known Member Feb 11, Haven’t checked the display but seems like its controllerless. The SED is somewhat limited, often used for that displays’ slighter smaller cousins.
The SED F was popular as an onboard or external controller which has been replaced by the S1D internal ram, lower power etc. I believe in general the term ‘driver’ in the context of LCD’s refers to the pixel drivers, which are indeed just giant shift registers that work on positive and negative voltage, and the term ‘controllers’ are used for higher functions such as refreshing, addressing, text generation, window-in-window, cursors etc.
I said ‘in general’ because the two are often interchangable and have caused me headaches in the past when researching how to drive these things.
There have been a couple of old AVR projects which drive sorry, control these displays directly using external SRAM but given the speed they don’t have much in the way of ‘options’. When I was talking about a “controller,” I was thinking of a chip to handle fonts and graphic placement.
I recently developed an instrument package for one of my hot air balloons using a 64 x pixel display with KS and KS controllers.
A PIC 16F provided all data input and display format. It took about lines cl79401 code in assembler, much of which consisted of graphics and fonts data tables. The display calculated and displayed, altitude,elapsed time, balloon temperature and rate of climb as a bar chart. I’ve attached a copy of the display. The PIC was only running at 4mhz and had no difficulty updating the display every half second. So I know it can be done for slowly changing data.
Hi, the KS and KS chipset are both drivers and lc74901 in one, they have the IO’s and datqsheet registers to control each pixel – but also the field memory RAM to refresh the display. So whilst any micro attached to these has to ‘draw’ text, essentially the LCD has an inbuilt controller – albeit with limited functionality. It stores the bitmap in memory, and constantly refreshes the display without intervention from whatever is controlling it.
Draw a pixel at one address location – and it’ll stay there. Lc7941 micro controlling it treats the LCD is memory, writing to address locations. The larger LCD you posted has no such controller. It requires clock and data lines to ‘scan’ across the display and refresh the image frame from memory. Much like a raster scan xatasheet a TV. So, clocking in data across a line, then moving to next line before flying back to the top, if datassheet draw a pixel in one location, unless you draw it again on every frame, it fades, so it require constant refreshing, usually at around Hz.
Often some delay is required before a ‘end of line’ sync pulse, so say this is So you’ll need to provide a new 4-bit nibble at 1.
Catasheet that data must be read from a memory internal or external you can see that it’ll take a good 4 cycles per 4-bit write. So, even without drawing anything on screen, printing fonts, your micro will be too busy just taking data from memory, and sending it to the display.
It is such a mundane task, moving data, doesn’t require intelligence, just counters, but at a speed beyond that of most 8-bit devices.
320 x 240 Grpahic Display for $4
Sorry for the pesimistic ‘numbers’ post. I’m not trying datawheet discourage folk from using the display, x’s are awesome! All that said, despite the cost of a controller IC, they don’t actually require much in the way of external circuitry. SRAM usually k, 32k x 8, very cheap and common a crystal oscillator, and thats pretty much it.
Again, sorry for the long post, I got a bit obsessed with LCD’s back in the days of sticking them on ones PC to display pointless information and my mind is stil full of crap about em Edit: Thanks for the clarification.
I wanted to see a ld79401 of the back because I think the traces are there for a controller and RAM. The EW34F50 on this page may be the unit: Blueteeth Well-Known Member Feb 12, I have other projects on my list right now so I’ll leave this LCD on hold. There may be too much effort needed to get it going.