Liquid Crystals! How they work and how to drive them!
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1 Liquid Crystals! How they work and how to drive them! 1!
2 Key things! Liquid crystals do NOT emit light!! Liquid crystals should NOT be run on DC! 2!
3 How do they work?! They use polarization! Light is a wave!» An electromagnetic wave! Has an electric field! And a magnetic field!» The polarization is the direction of the electric field!» In this picture, the light is polarized vertically! 3!
4 Light might or might not be polarized! Some rays might be vertical, others horizontal, or every which way! Can polarize it by running it through a polarizer! 4!
5 Experiment:! Look around the room through a polarizer! Does anything look different?! People cannot detect polarization, but some animals can!» Some insects!» Octopuses! showimage.html! 5!
6 Suppose light is polarized already?! What if light is polarized vertically?! What if you try to pass it through a horizontal polarizer?! It won t go through!! 6!
7 What would you see if you looked Try it and see! through them?! 7!
8 So, we have established! If you look at randomly polarized light, you don t notice anything! You can polarize light with a polarizer! Vertically polarized light will pass through another polarizer that s vertical! Vertically polarized light will NOT pass through a horizontal polarizer! 8!
9 Weirdness! If you add vertically polarized light to horizontally polarized light, you get! 45 polarized light!! 9!
10 Look at that backward! If you have 45 light, you can resolve it into vertical and horizontal components! 10!
11 What should you see! If you start with 45 light, and try to pass it through a vertical (or horizontal) polarizer?! Light will still pass, but not all of it!» The passed component will be dimmer! 11!
12 Experiment! Hold a polarizer up to the light! Hold up a second one!» Line it up!» Turn it to 45!» Turn it to 90! 12!
13 Advanced experiment! Take two crossed polarizers! Can t see through them! Add a third one between them! Turn third one to 45! What s going on?! 13!
14 How do liquid crystals work?! They change the polarization of the light! Put a polarizer on the front and back! The molecules are arranged in a twist! They twist the polarization so it passes through the back!!» With no voltage applied! 14!
15 When you apply the voltage! The molecules turn end-on so the light doesn t get twisted! Light can t pass through the second polarizer! Looks black! This is a transmissive display!» It s lighted from the back! 15!
16 Reflective LCD! Mirror on the back! Light comes from front! 16!
17 How do you apply the voltage?! There are transparent electrodes on the front- one for each segment! Voltage only applies where the electrode is! Has to be AC! LCD.html#b! 17!
18 AC vs DC! DC: direct current! AC: Alternating current! 18!
19 Quiz: Which one did we use for the LEDs?! 19!
20 Advantage of LEDs:! Drive circuitry is simple!! 20!
21 Liquid crystals! Have very thin transparent electrodes plated onto the glass! Electric field will cause particles to migrate from one side of the display to the other! Will deplate the electrodes! 21!
22 But, can work around it! If you reverse the voltage, you reverse the direction of the molecule migration! Saves the electrodes!! THIN!! 22!
23 Need a circuit to make a square wave! Has to go positive and negative! Has to spend same amount of time positive as negative! 23!
24 Let s examine this! What is the average value in this section?! Right, 5 Volts! 24!
25 What about here?! What is the average value in this section?! Right, 5 Volts! 25!
26 What about here?! Average= -5! 26!
27 What about here?! Average= -5! 27!
28 What is the average voltage over one cycle?! Average of four things: add them, then divide by four! ( +5 ) + (+5)+ ( 5) + ( 5) = 0 = 0 4 That s what we wanted: zero average volts over time! 4 28!
29 What is the average over two cycles?! Average of two things is the sum of the two divided by zero! We know the average over one cycle is 0! (0+0) 2=0! 29!
30 What about this one?! Average value of first section?!» ! Average value of second part?!» -5 x 1 = -5! What is the average value?! ( 5) 10 1 = = 2 = !
31 What do you think the average value of this one is?! Right!!» -2.5 V! ( 5) + ( 5) + ( 5) + (+5) 10 = !
32 So! We require:! An AC (alternating current) signal! A zero average value over time! Therefore we require this! Not this! 32!
33 So, you ll build two things! Driver circuit! Converts DC form battery to square wave! Must have zero average value! Check with oscilloscope! LCD Display!! This one is numeric! You can write whatever you like!» Engineer s favorite instrument!! Once working, build second part! 33!
34 Here is what you will build! 34!
35 You already know! How to use a breadboard! How to read a schematic! So go for it!! Build the circuit! Check it with the oscilloscope! Once working, connect it to the liquid crystal display! 35!
36 Here is the schematic! 555 timer chip! display! resistors! battery! capacitors! 36!
37 You should have the following! One 555 timer chip! Four resistors!» 100KΩ (brown black yellow) (three of them)!» 10KΩ (brown black orange)! 100nF capacitor! 10 nf capacitor! Battery! Battery snap! Breadboard! Display (we ll give you later)! Pieces of wire (lots)! 37!
38 Now we re ready to build Well use a breadboard All holes in long columns connected together» These are called buses» Handy for when you have to connect many things to the same point Holes in short rows connected 38!
39 Here is the schematic! 555 timer chip! display! resistors! battery! capacitors! 39!
40 Pinout of the 555 Timer! Divot on end of chip is up! Pins numbered from upper left-hand corner! Pin numbers go down one side and up the other! 40!
41 Square wave portion of circuit! Note positive and negative busses! Other two busses will be LCD busses! Divot! 41!
42 Positive Bus! 8! 4! Measure! 555! 6! 3! DISPLAY! 100KΩ! 9V! 100KΩ! 7! LCD Bus! 10KΩ!! Common Cathode! 2! 100nF! 1! 5! Negative Bus! 100KΩ! 10nF! 42!
43 Now add voltage divider ad measure (before adding display)! Alligator clip from scope probe connects here! Probe connects to LCD bus! Voltage divider! 43!
44 Now add display! 44!
45 LCD pinout! 24! 13! A! F! E! G! B! C! 1! 12! D! 45!
46 To remove parts! PLEASE use IC removal tool! Avoids bending leads! Avoids breaking PCD! Avoids puncturing fingers! 46!
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