science

Portable DVD player

Portable DVD player is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Portable DVD player rather than just read about it. In short: A portable DVD player is a mobile, battery powered DVD player in the format of a mobile device. Many recent players play files from USB flash drives and SD cards.

Key takeaways

Portable DVD player belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Portable DVD player to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Portable DVD player from memory before moving on to harder problems.

Reference excerpt

A portable DVD player is a mobile, battery powered DVD player in the format of a mobile device. Many recent players play files from USB flash drives and SD cards.

History The first portable DVD player was introduced in 1998 with the Panasonic DVD-L10. They are made to be used when traveling. Many are able to perform secondary functions such as playing music from audio CDs and displaying images from digital cameras or camcorders.

Impact The popularity of low-cost battery powered portable DVD players in North Korea allows families to watch Chinese and South Korean programs on SD cards and USB flash drives. North Korean defectors run activist groups, such as Fighters for a Free North Korea that smuggle DVDs and SD cards into the country "to introduce North Koreans to the rest of the world". Activist groups planned to distribute DVD copies of The Interview via balloon drops. The balloon drop was postponed after the North Korean government referred to the plan as a de facto "declaration of war."

Design Most PDPs use TFT LCD, some using LED backlighting. The most common PDP screen size is 7 inches (18 cm), although some are as large as 10 to 12 inches (25 to 30 cm) - the larger size competing with tablet computers. The battery weight and need for portability presented problems - including problems with mechanical shocks interrupting the reading of the DVD. Some have articulating screens that rotate 180 degrees and fold flat. Portable DVD players generally have connections for additional screens and a car lighter plug. Some PDPs had iPod docks, USB and SD card slots built in. Some can play videos in other formats such as MP4, DivX, either from CDs, flash memory cards or USB external hard disks, and some DVD players had a USB video recorder. Additional features found on PDPs include:

Wi-Fi access, allowing it to play Internet TV. Bluetooth, allowing users to play content from or to other devices like smartphones. AV inputs for external game consoles; now some selected models have built-in emulators for playing, usually retro, video games. The ability to display more than just video DVDs, such as other video formats, image formats and music formats A built-in digital TV tuner, so you can watch digital TV on the go.

Price range Prices of portable DVD players vary, usually retailing for about US$40–300. When first released, portable DVD players would retail at over $1,000 and were only manufactured in Japan. Price drops in 2015 have led to some devices being retailed for as little as $40.

See also Portable CD player Digital television In car entertainment Handheld television Notel Television set Video Walkman

References

External links Portable DVD Players info from CNet

Illustrations

Worked examples

Example 1 — a first encounter with Portable DVD player

Start with the simplest possible case. Write down what Portable DVD player claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Portable DVD player before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Portable DVD player ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Portable DVD player

In research: Portable DVD player appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Portable DVD player in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Portable DVD player is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1998 introductions, Consumer electronics, Hardware DVD players, so understanding it makes those chapters shorter.
In everyday life: Look for Portable DVD player outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Portable DVD player in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Portable DVD player means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Portable DVD player out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Portable DVD player in simple terms?

A portable DVD player is a mobile, battery powered DVD player in the format of a mobile device. Many recent players play files from USB flash drives and SD cards.

Why does Portable DVD player matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Portable DVD player?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Portable DVD player.