Resistive touch screen

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Quick Questions

Shade in the A or B circle for each question.

1. How does a resistive touch screen detect where you touch?

A The screen senses the electrical charge from your finger

B Two conductive layers touch and the change in resistance gives the position

2. What separates the top flexible layer from the bottom layer in a resistive touch screen?

A A layer of infra-red beams

B A small gap

3. What makes the two layers of a resistive touch screen touch each other?

A Pressure from a finger, glove or stylus

B The heat of a finger

4. Which of these can be used on a resistive touch screen?

A A gloved finger

B Only a bare finger

5. Compared with other touch screens, a resistive touch screen is usually...

A Cheaper but less clear

B More expensive and clearer

Match the Pairs

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

Left column		Right column
1resistive touch screen		AA screen with two conductive layers that touch when pressed, so the change in resistance gives the touch position
2top layer + gap + bottom layer		Bif pressure_applied: layers_touch = True
3Pressing a resistive screen makes the two layers touch at that point, which changes the resistance		CThis describes an infra-red touch screen. A resistive screen detects touch when two layers are pressed together and the resistance changes.
4A resistive screen works with a finger, a glove or a stylus because it responds to pressure, not to the electrical charge of skin		Dinput in ["finger", "glove", "stylus"]
5A resistive screen detects touch by sensing infra-red beams being broken		EA flexible top layer sits above a bottom layer with a small gap between them until the screen is pressed
6A resistive screen only works with bare fingers and easily supports multi-touch		FResistive screens work with a finger, glove or stylus, and they do not easily support multi-touch. Only a bare finger is needed on a capacitive screen.

Definitions

resistive touch screen

Fill in the Blanks

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

conductiveLayers = _

IF screenPressed = TRUE ____ layersTouch = TRUE ENDIF

touchPosition = getPosition(__________)

multiTouchEasy = _____

worksWithGlove = ____

Spot the Error

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

Question 1

A IF pressed THEN

B layers stay apart

C resistance changes

D ENDIF

Question 2

A top layer = rigid

B bottom layer = rigid

C gap = air between layers

Question 3

A screen = resistive

B finger works: TRUE

C glove works: FALSE

D stylus works: TRUE

Question 4

A screen = resistive

B cost = usually cheaper

C clarity = very clear

Question 5

A screen = resistive

B multi-touch = very easy

C cost = usually cheaper

Answer Key

Resistive touch screen

Section A: Quick Questions

B — Two conductive layers touch and the change in resistance gives the position

B — A small gap

A — Pressure from a finger, glove or stylus

A — A gloved finger

A — Cheaper but less clear

Section B: Match the Pairs

resistive touch screen → A screen with two conductive layers that touch when pressed, so the change in resistance gives the touch position

top layer + gap + bottom layer → A flexible top layer sits above a bottom layer with a small gap between them until the screen is pressed

Pressing a resistive screen makes the two layers touch at that point, which changes the resistance → if pressure_applied: layers_touch = True

A resistive screen works with a finger, a glove or a stylus because it responds to pressure, not to the electrical charge of skin → input in ["finger", "glove", "stylus"]

A resistive screen detects touch by sensing infra-red beams being broken → This describes an infra-red touch screen. A resistive screen detects touch when two layers are pressed together and the resistance changes.

A resistive screen only works with bare fingers and easily supports multi-touch → Resistive screens work with a finger, glove or stylus, and they do not easily support multi-touch. Only a bare finger is needed on a capacitive screen.

Section C: Definitions

resistive touch screen — A screen with two conductive layers that touch when pressed; the change in resistance at the touch point gives its position. Works with finger, glove or stylus.

Section D: Fill in the Blanks

conductiveLayers = 2

IF screenPressed = TRUE THEN
  layersTouch = TRUE
ENDIF

touchPosition = getPosition(resistance)

multiTouchEasy = FALSE

worksWithGlove = TRUE

Section E: Spot the Error

B — When a resistive screen is pressed, the flexible top layer touches the bottom layer at that point. The line should say the layers touch, not stay apart.

A — The top layer of a resistive screen must be flexible so it can bend down and touch the bottom layer. It should be 'top layer = flexible'.

C — A resistive screen works by pressure, so it works with a gloved hand as well as a finger or stylus. It should be 'glove works: TRUE'.

C — The extra layers reduce how much light gets through, so resistive screens are less clear. The line should be 'clarity = less clear'.

B — Resistive screens find one touch point and do not easily support multi-touch. The line should say multi-touch is not easy.