1.2 Laptop Displays

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Laptop Displays

 

 

Portable LCD

 

 

LCD

 

 

 

• Liquid Crystal Display - Light shines through liquid crystals
• Advantage - Lightweight, Relatively low power, Relatively inexpensive
• Disadvantage - Black levels are a challenge, Requires separate backlight -> Florescent, LED, etc -> Lights are difficult to replace

 

 

 

 

 

 

 

 

LCD technologies

 

 

TN vs. IPS vs. VA

 

 

 

• TN (Twisted Nematic) LCD - The original LCD technology, Fast response times (gaming!), Poor viewing angles -> color shifts
• IPS (In Place Switching) LCD - Excellent color representation, More expensive to produce than TN
• VA (Vertical Switching) LCD - A good compromise between TN and IPS, Good color representation, Slower response times than TN

 

 

 

 

 

 

 

 

 

 

OLED

It doesn't have a backlight

 

OLED

 

 

• Organic Light Emitting Diode - Origanic compound emits light when receiving an electric current
• Thinner and lighter - Flexible and mobile -> no glass needed
• No backlight - The organix compound provides the light
• Tablets, phones, smart watches - Very accurate color representation, A bit higher cost than LCD

 

 

 

 

 

 

 

 

 

Wi-Fi antennas

remember to connect all of these antenna wires

 

 

WiFi antennas

 

• Multiple antenna - WiFi main and aux, Bluetooth 
• Antenna wires wrap around the laptop screen - It's up high!

 

 

 

 

 

 

 

 

 

 

 

 

Webcam

 

Webcam

 

 

• Video capture - Built-in camera and microphone
• Usually includes both audio and video - Specialized drivers and software

 

 

 

 

 

 

 

 

 

 

Microphone

 

Microphone

 

• Built-in to the laptop display - Useful for video calls
• Not good for non-casual use - Analog or USB microphones can help

 

 

 

 

 

 

 

 

 

 

 

 

Fluorescent vs. LED backlighting

 

 

 

LED vs. CCFL

 

 

 

• CCFL (Cold Cathode Fluorescent Lamp) - Higher voltage and power needed, Added thickness to the display, No longer a common backlight, Older laptops will use there
• LED-backlit LCD display - Backlight is LEDs instead of fluorescent, LEDs around the edge of the screen, An array of LEDs behind the screen, The latest laptops are LED-backlit

 

 

 

 

 

 

 

 

 

 

 

Backlight and inverter

 

 

CCFL LCD Monitor Backlight Control inverter

 

 

• LCD displays need a backlight - Florescent lamp/LED to LCD display to your eyes
• Some laptops have inverters - Turn DC into AC
• Verify backlight - Look closely, Use a flashlight
• May need to replace the LCD invertor or display - Choose carefully

 

 

 

 

 

 

 

 

 

 

Digitizer

 

 

Digitizer

 

 

• Use a pen-like device as input - Stylus input, Useful for graphical input
• Used commonly on laptop/tablets - Or hybrid devices

 

 

 

 

 

 

 

 

 

 

Touchscreen

 

 

Touchscreen

 

 

• Merge laptop and tablet input - Digitizer responds to touch (through finger), No Keyboard required, But often still available
• Used commonly on laptop/tablets - Or hybrid devices