Character LCD module grayscale display
It is a convenient and popular display device in electronic work. The display of this kind of LCD module only has 2 grayscale dot matrix ON/OFF, and there is nothing that can display multiple grayscales. However, with a little ingenuity in how you use these LCD modules, you can use gradient displays to add various attributes to boring character LCDs.
Grayscale display mode
As explained in the STN LCD panel demo, the grayscale display of the STN LCD monitor is performed by frame-by-frame point ON/OFF ratio control (so-called PWM). Since the response of STN liquid crystal is slow, ON/OFF is displayed in average concentration. Graphical LCD controllers handle this problem (3D jitter) in hardware.
The character LCD display module is also an STN LCD or TN LCD, and should also be able to display grayscale. However, the HD44780 does not have this grayscale display function, so it requires software to rewrite the display to achieve it.
In the experiment, as shown on the right, we added gray levels (4 gray levels) to the display by rewriting the display in a sequence of 3 frames for each frame. If you do not adjust the rewriting timing according to the LCD frame timing, you will not be able to obtain a clear grayscale display. Even simpler labeling in the background of an active item in a two-frame sequence is expected to yield a satisfactory display.
#Character #LCD #module #grayscale #display
- What is a GTMS connector? What are the applications of GTMS connectors?
- What is the difference between normal power supply ripple and noise?
- Bad Q4 for mobile network investment
- How will FPGA affect AI in 2024?
- Things to consider when synchronizing oscilloscopes A brief analysis of the causes of timing errors between oscilloscopes
- Is the smaller the charger ripple the better?
- ST ToF 3D LiDAR module has 2.3k resolution
- Innovative hybrid case design and partial packaging of TCI power series
- The most comprehensive and latest overview of the automotive sensor field and its complete industry chain
- How to set the 1A limiting current in the overcurrent protection circuit?