Q: What is LED (Light Emitting Diode)?
A: LED (Light Emitting Diode) is the most commonly used backlight for Cellular phones. The LED backlight offers some benefits over the EL backlight. To start, the LED backlight does not require an inverter, just a DC source of +3VDC~+5VDC. Secondly, depending on the backlight configuration, the brightness can very bright, and thirdly, the life of the LED exceeds 50K hours.
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Abbreviation of light emitting diode, an electronic device that lights up when electricity is passed through it. LEDs are usually red. They are good for displaying images because they can be relatively small, and they do not burn out. http://www.webopedia.com/TERM/L/LED.html http://www.edgesystem.net/LED_light_therapy.htm
A small indicator light most often used to show the power is on or the device is being used. LEDs are found on your computer case, monitor, printer, modem, CD-ROM drive, and hard drive.
What is Inside an LED?
LED's are special diodes that emit light when connected in a circuit. They are frequently used as "pilot" lights in electronic appliances to indicate whether the circuit is closed or not. A a clear (or often colored) epoxy case enclosed the heart of an LED, the semi-conductor chip.
LED leads
side lead on flat side of bulb = negative
The two wires extending below the LED epoxy enclosure, or the "bulb" indicate how the LED should be connected into a circuit. The negative side of an LED lead is indicated in two ways: 1) by the flat side of the bulb, and 2) by the shorter of the two wires extending from the LED. The negative lead should be connected to the negative terminal of a battery. LED's operate at relative low voltages between about 1 and 4 volts, and draw currents between about 10 and 40 milliamperes. Voltages and currents substantially above these values can melt a LED chip.
The most important part of a light emitting diode (LED) is the semi-conductor chip located in the center of the bulb as shown at the right. The chip has two regions separated by a junction. The p region is dominated by positive electric charges, and the n region is dominated by negative electric charges. The junction acts as a barrier to the flow of electrons between the p and the n regions. Only when sufficient voltage is applied to the semi-conductor chip, can the current flow, and the electrons cross the junction into the p region.
In the absence of a large enough electric potential difference (voltage) across the LED leads, the junction presents an electric potential barrier to the flow of electrons.
According to smith and Hamon (2012), Families are considered as a whole in society. However, they believed that couples have many components in which makes up the family, if one component is missing, the family as a whole can get unbalance (Smith & Hamon, 2012). In the Brice’s family, communication was the component that was missing. The couple was not able to communicate their differences, which was what caused Carolyn and David to verbally insult each other. Smith and Hamon (2012), also explain that a person who expresses his or her feeling is considered as someone who is breaking the functions of their family system; especially if the person is focusing on the individual who is causing the problem, rather than the problem itself. In the Brice family, Carolyn could be considered the one that cause the dysfunction in the family structure because she was focusing on David as the problem of their marriage, rather than focusing of the elements that are causing their problems. Smith and Hamon (2012) explain that individuals should focus on how to solve a problem, rather than trying to find who is causing the
At Cook Children’s Hospital, NICU parents are not only seen as the parents of the infants, but they also incorporate them as part of the team. Parents are highly encouraged to spend as much time as they possibly can with their premature infants, to have physical contact with them by giving them kangaroo time, which allows parents to have skin-to-skin contact with their infant, as soon as the infant reaches the stage in which he or she is a suitable candidate to be in physical contact with their parents. Siblings who are over 3 are allowed to visit their siblings at the NICU at specific times of the day, and child life specialists help siblings understand what is going on with their baby brother or sister who is in the NICU. If they have any specific questions, the child life specialist is there to assist them. Families are referred to other institutions that will be able to help them if their facilities aren’t able to fulfill their needs. One of the institutions that...
The exclusion of African Americans from the GI bill of rights to obtain a new job, education, and adequate housing shows how the Consumers’ Republic was not truly a free and equal society to consume because they were unable to live the “American Dream”.
Since the 20th century, researchers have sought out solutions to help assist families and the individual components that make up family systems overcome the challenges and schisms that can inhibit individuation and stability. Two theoretical perspectives, the family-systems theory and the family-development theory, were conceived to gain as Balswick & Balswick (2014) noted, gain “a wide-angle view of family life” (p. 22). Though these two theories have merit, one I found to be more advantageous in gaining a better understanding of the family as an actively metastasizing organism, which needs to be approached more adaptively.
During and succeeding the Era of Reconstruction, African American lives were reformed in very substantial ways. Most African Americans thought of Reconstruction as an opportunity to improve the lives of their entire race. They thought it would help them bring equality to their people. However, Reconstruction showed many African Americans how difficult it was to survive independently. Once they left their plantations, they had nowhere to live. African Americans living in the south struggled to find food and shelter. To make matters much worse, Southern Whites were beginning to fight to retain southern white supremacy. “Reconstruction did not provide African Americans with either the legal protections or the material resources to ensure anything
People are always in transition with their environment, and each subsystem has an impact on the whole system. This is also why I am using the Family Systems approach, as I am also able to see how the family system has affected Precious, and how the family has functioned across the lifespan. It is important because we can discuss boundaries, individual’s roles, communication in the family, the family structure and how this influences the families functioning not only with Precious’s Mother and Father, but with her own children as well. With systems theory and the Family Systems approach, the basis is that a Systems component can only be understood as part of the Whole, therefore when working with an individual such as Precious, all aspects of their personality and environment must be considered and worked with as a whole. (Payne,
An adage goes by “show me your friends and I will tell you who you are” but in family system theory, it more like show me/tell me about a family member, and I will tell and interpret the family as a whole. Family system theory work hand in hand with the definition of family because, based on how the family defines itself, you can tell more about the family in terms of their communication and coexistence in general.
Today, African Americans are still unequal economically, exhibiting how the pursuit of democracy remains incomplete. The origin of this inequality can be traced back to the “Jim Crow” Era. From 1939 to 1959, the average African American made from 44% to 59% of what the average white worker made. Meaning that the average African American salary was about half of the average white salary. An imbalance that resulted in large economic inequality. With more money the white population was able to pay for more luxurious houses and items, as well as better schooling. This led to two main results. First, class based housing became based on race, where white citizens lived in rich suburbs and African Americans lived in poor ghettos. Not only did this
According to Richard Charles (2001) “the effectiveness of family systems theory rests not much on empirical research but on clinical reports of positive treatment outcomes, the personal benefits experienced by the families that underwent this kind of treatment, and the elegance of Bowen’s theory” (p. 279). Bowen’s family systems theory views the family as an emotional unit and is a theory of human behavior. Systems thinking are used to describe the complex interactions in the unit. However, the client’s ability to differentiate himself/herself from the family of origin is the basis for Bowen’s family systems theory. In addition, the primary focus for growth within the emotional system is differentiation of self. Differentiation of self will be explored as well as how it relates to a church congregation.
The CRT monitors work in a fashion similar to that of standard television sets. An electron gun is mounted at the back of the monitor. The gun fires a steam of electrons in a sweeping motion towards the front of the monitor. The electrons then pass through either an aperture grille, or a shadow mask. These items work to filter the electrons into focused beams onto the front plate. The grill does this via thin vertical wires, while the mask does this with a series of small holes. After passing through the filter, the electrons collide with the screen. The screen is covered with a serried of red, green and yellow phosphors that light up when hit by the electrons. By combining different intensities of the three colors, many different colors and images can be created.
Cell phone manufacturers and service providers are at the core of the cell phone industry. These corporations are integral from their research and development endeavors to interactions with the consumer and the marketing of new products. The companies that control such factors of cellular phones are very numerous, so it is difficult to address all the cell phone manufacturers and service providers. However, we have focused largely on only the most significant cellular companies namely in the U.S. marketplace, although many have global ties. Collectively, companies around the world have the same goals in mind – to create desirable cutting-edge technology and to increase consumer satisfaction with hopes of generating sales, and thus profits.
Everybody says that if you are picking LED lights, don't go for red because it is one of the dull colors. But, in case of Fairy Lights, the red in the ornaments was glowing alongside the sparkling white.
...have the most robust connections alive. They also have the intimacy, influence, design, impact and carving tools to carve us. The family itself can control and change our views on society, influence how we view the family unit, and yet most of all impact our everyday choices. There is nothing the family couldn’t possibly do. Anne Frank, Kino, Mourad, The Scieszka brothers, and the brother in family are divine exemplar for us to see the way a family can sway. Since the drive of the family is the second influential component of life, love is the first. Yet we fail to see that the family is the love, it doesn’t matter if they’re poor, if they’re trapped, or even throwing up on each other, this is the strongest love in the world. People move on, but they always remember the family. The family is wolf pack, everyone des there own thing, but they always remain together.
Thomas Alva Edison is a very well-known American inventor. He invented about 1093 devices that influenced us greatly, such as light bulb, microphone, telephone receiver, universal stock ticker, phonograph, kinetoscope (used to view moving pictures), storage battery, electric pen, and mimeograph. Edison also improved many other existing devices as well. In the period from 1878 to 1880, Thomas Edison began serious research into developing a practical incandescent lamp. Edison and his associates worked on at least three thousand different theories to develop an efficient incandescent lamp. In 1878, Edison built his first high resistance incandescent electric light. Incandescent lamps make light by using electricity to heat a thin strip of material (called a filament) until it gets hot enough to glow. Many inventors had tried to perfect incandescent lamps to "sub-divide" electric light or make it smaller and weaker than it was in the existing arc lamps, which were too bright to be used for small spaces such as the rooms of a house.Edison's lamp would consist of a filament ho...
Cell phones represent a type of technology that has been around for more than over fifty years; it has only been recently that many people began to use cell phones as a major part of their everyday life. In the past cell phones were for business people to conduct their business, but in today’s society every one owns a cell phone. Cell phones are interesting, useful and also play a major role in our life’s bringing people closer and keeping in touch with one another. Most people do not know and understand the physics of a cell phone. Cell phones are also known as cellular phone, hand phone, and commonly known as a mobile phone. A cell phone is an electric device that can make and receive calls, over and automatic repeat request (radio link petrol -RLP) used over wireless air interdace.it us a portable telephone that uses and receive phone signals.it also divides that earth into small regional called cells.in the resent estimates there are over 190 million people using mobile phone. One of the primary health concerns is the impact of cell phone radiation, by radio waves by which it operates.