|
询问Touch Guy!
Question:
I am prototyping an in-car computing and entertainment system and am hoping you can recommend a touch screen that fulfills my requirements. I'm looking for:
- 7" screen size
- Low or reasonable cost unit
- VGA and standard AV input with auto or manual switching
- Multi-touch capable
- Minimum of 800x600 screen resolution
- Open frame or chassis mount
- Sunlight readable or transreflective with excellent contrast ratio
- Drivers for Linux and Windows platform
- Able to operate at high temperatures (up to 60ºC / 140ºF)
- Wide viewing angle
- Power supply of 10-13.6V power for use on vehicle power
Thanks,
Ammar
Touch Guy's Response:
|
Hey Ammar:
Touch Guy finds that he has two categories of customer….one who will describe their product, close their eyes, and when they open them, Touch International will have delivered the perfect touch system to make the product a success. The other half of customers will give greater specification, including materials and possibly the electronics, and we will design to those standards. (There is actually a third type of customer, less common, who will say, “make me one like that” while pointing to a competitive product).
You fall into the second category. A prominent part of your specification is the display you chose (item one). The 7” TFT display is absolutely the best value display on the market, probably because it can be made in fab’s that have been fully amortized. It is also the universal donor, because up until a few months ago, all 7” displays had exactly the same dimensions, resolution, mounting, electronics drive and performance; this will also save you money on your touch screen since we know our 7” MulTI-Touch projected capacitive sensor will work with virtually any 7” display that you choose.
|
|
Since the 7” displays are all the same, there are a few specs you will have to compromise on; the resolution for the display is 800x480 instead of 800x600, there are no wide viewing angles and there are no displays with automotive high temperature performance. You will also want to consider how important a sunlight readable polarizer is to your product because it will have to be retrofit, increasing the cost of the display.
After the compromise, there are only two, of the eleven points, that have to do with the touch screen - multi-touch capability and Linux/Windows drivers. There are a few additional features that you should consider adding to the touch panel, like proximity sensing, so you can wave your hand near the display to increase the brightness at night. You should also think about building a heater into the touch panel to warm the LCD in cold climates and adding sensitivity for driving gloves.
Frankly, much of the complexity can be eliminated in a short conversation…so, let’s talk.
Until next time, Touch Guy
Do you have a question for Touch Guy? Send him an e-mail at asktouchguy@touchintl.com. |
| |
|
|
