This tip demonstrates how to invert a displays pixel polarity using the Amulet HTMLConverter.
LCD Characteristics Refresher
The Amulet HTMLCompiler has a built-in feature which allows you to program an LCD's characteristics into an Amulet starter kit, module kit or controller board. Some of the characteristics include the following:
-LCD Width
-LCD Height
-Frame Frequency
-Pixel Clock Active Edge
-Line Pulse Polarity
-Display Polarity
-# of Data Bits
Lets say you decide to replace the existing backlit display in your Amulet starter kit with a different manufacturers display. Once you connect the new display to your Amulet starter kit and power up the kit, it looks different than before. You immediately notice the pixels that used to be dark on the old display are now light on the new display and the pixels that used to be light on the old display are dark on the new display. Hmm, what happened?
The manufacturers themselves determine the displays pixel polarity and since there really is no standard, there can be 2 possibilities. The problem occurs when a manufacturer determines whether a pixel being turned on means dark or light. One manufacturer may consider a pixel turned on as dark and another manufacturer may consider it as light.
The Example
Regardless of the display, the best thing to do is try both display pixel polarities and go with the polarity that looks best.
Step 1
From the HTMLCompiler's Settings menu, select LCD. Figure 1 shows a partial screen of the LCD characteristics dialog box which appears upon selecting Settings -> LCD from the HTMLCompiler's menu bar.
