Comparing LCD and DLP projectors

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which type of projector makes its image using thousands of tiny mirrors?

A DLP projector

B LCD projector

2. Which type of projector shines light through liquid crystal panels?

A LCD projector

B DLP projector

3. Which statement about LCD and DLP projectors is true?

A Both display an image on a screen

B Only DLP projectors can display an image on a screen

4. What is a micromirror in a DLP projector?

A A tiny lens that magnifies the image

B A tiny mirror that tilts to reflect light

5. A teacher carries a projector between classrooms every day. Which type is usually the better choice for portability?

A LCD projector, because it is always smaller and lighter

B DLP projector, because it is usually smaller and lighter

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1LCD panels		ALCD projector
2Micromirrors		BThis describes an LCD projector. A DLP projector uses tiny micromirrors that reflect light, not liquid crystal panels.
3A projector that is usually smaller and lighter and gives a sharper image, so it is easy to carry between rooms		CDLP projector
4A projector that is usually cheaper to buy, which suits a school with a small budget		DLight is shone through liquid crystal panels to make the image, which is then projected onto the screen
5A DLP projector shines light through liquid crystal panels to make the image.		EThey make the image differently (panels versus micromirrors), so sharpness, colour, size and cost differ and the choice does matter.
6LCD and DLP projectors make the image in exactly the same way, so the choice does not matter.		FThousands of tiny mirrors tilt to bounce light towards the screen or away from it to build the image

Definitions

LCD vs DLP

Fill in the Blanks

Complete each line of code by filling in the missing parts.

DLP.light ← "reflects off ____________"

LCD.light ← "passes through ______________ panels"

IF portable = TRUE THEN projector ← "___" ENDIF

__ sharpness = "high" THEN projector ← "DLP" ENDIF

IF budget = "low" THEN projector ← "___" ENDIF

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A projector = "LCD"

B if projector == "LCD":

C print("Light passes through")

D print("tiny mirrors")

Question 2

A projector = "DLP"

B parts = "liquid crystals"

C print(parts)

Question 3

A dlp_cost = "higher"

B lcd_cost = "higher"

C print(lcd_cost, dlp_cost)

Question 4

A projector = "DLP"

B size = "large and heavy"

C print(projector, size)

Question 5

A lcd = {"cost": "low"}

B dlp = {"cost": "high"}

C cheaper = "LCD"

D print(cheaper, "costs more")

Answer Key

Comparing LCD and DLP projectors

Section A: Quick Questions

A — DLP projector

A — LCD projector

A — Both display an image on a screen

B — A tiny mirror that tilts to reflect light

B — DLP projector, because it is usually smaller and lighter

Section B: Match the Pairs

LCD panels → Light is shone through liquid crystal panels to make the image, which is then projected onto the screen

Micromirrors → Thousands of tiny mirrors tilt to bounce light towards the screen or away from it to build the image

A projector that is usually smaller and lighter and gives a sharper image, so it is easy to carry between rooms → DLP projector

A projector that is usually cheaper to buy, which suits a school with a small budget → LCD projector

A DLP projector shines light through liquid crystal panels to make the image. → This describes an LCD projector. A DLP projector uses tiny micromirrors that reflect light, not liquid crystal panels.

LCD and DLP projectors make the image in exactly the same way, so the choice does not matter. → They make the image differently (panels versus micromirrors), so sharpness, colour, size and cost differ and the choice does matter.

Section C: Definitions

LCD vs DLP — Both projectors show an image on a screen. LCD shines light through liquid crystal panels; DLP bounces light off tiny mirrors (micromirrors). They differ in sharpness, colour, size and cost.

Section D: Fill in the Blanks

DLP.light ← "reflects off micromirrors"

LCD.light ← "passes through liquid crystal
 panels"

IF portable = TRUE THEN
  projector ← "DLP"
ENDIF

IF sharpness = "high" THEN
  projector ← "DLP"
ENDIF

IF budget = "low" THEN
  projector ← "LCD"
ENDIF

Section E: Spot the Error

D — An LCD projector shines light through liquid crystal panels. Tiny mirrors (micromirrors) are used by DLP projectors, so line 4 should say liquid crystal panels.

B — A DLP projector makes its image with millions of tiny mirrors (micromirrors). Liquid crystal panels belong to LCD projectors, so parts should be "micromirrors".

B — LCD projectors are usually cheaper than DLP projectors, so lcd_cost should be "lower" to show the cost difference.

B — DLP projectors are usually smaller and lighter, which makes them more portable. Line 2 should say "small and light".

D — The LCD projector is the cheaper one, so the message should say it costs less, not more. Line 4 should print "costs less".