Skip to main content


Monitor is also called as ‘VDU’ Visual Display Unit. Monitors & TV set’s use ‘CRT’ Cathode Ray Tube technology initially. In the present environment a newly developed technology has changed the entire VDU’s drastically referred as ‘TFT’ Thin-Film Transistor known as LCD. In today’s world the monitor is not “Just a Display”, by HD (High Definition) a high quality video content is available today. With the High quality rendering Video and High end Graphics and Games there is an improvisation in display.

Older: In previous technology CRT is used in display stands for picture tube. In CRT there is a glass envelop consists an electron gun and a phosphor-coated screen. When a computer sends display signals to a monitor these (signals) are converted in to electrons, beamed on to the phosphor-coated screen by electron gun creating an image on the screen.

Newer: In present technology TFT technology is used in LCD displays. The main advantage of TFT is the presence of the tiny transistors that make each pixel on the screen. The power consumption is low due to the transistors being diminutive in nature. LCD is also referred as Flat screen or TFT which consists of a liquid-crystal material which is sandwiched between two sheets of glass. When the current passes the molecules inside change their alignment causes light emission on some portions and blocked on some other finally creates an image.

HD (High Definition): HD refers to a video system or stream of higher definition than the standard (SD).The resolution of a HD TV or Monitor is 1080 or 720 horizontal lines, whereas the resolution a digital television (DTV) is 486 lines.

Advantage of TFT (LCD) over CRT: TFT’s are light weight, occupies less space, radiation emission and so on. Native Resolution is present in LCD and it is absent in CRT.

Disadvantage: Response time taken is large which causes blurriness while watching action packed scenes. Viewing angle shows the difference in watching CRT & LCD.

Different aspects between CRT & LCD

Screen Size: The screen size of CRT monitor is measured diagonally across opposite corners of the screen in inches. In CRT monitor the display area is smaller because it includes screen frame where as in LCD it is measured excluding the borders.

Aspect ratio: The Aspect ratio is nothing but the ratio of width to height. In CRT & in normal TV sets it is 4:3 , where as in LCD and present technology used in TV’s there are two types of display namely Conventional & Wide screen. The present aspect ratios are 4:3 & 16:10 (used in HDTV).

Due to this Aspect ratio we may sometimes see the Black Bands at the top and Bottom.

Resolution: Resolution is the number of pixels gets active during display in the monitor. The higher the resolution gets better picture clarity. It is measured as Width * Height.

Post a Comment

Popular posts from this blog

CORRUPTION - the cause, its effect, the types and the solution for eliminating it

Misuse of entrusted funds and power for private/individual gain is termed as Corruption. It is generally described as cheating, bribing or doing other unethical things in order to get personal benefit or profit. It includes giving or accepting bribes, offering inappropriate gifts, manipulating elections, swallowing funds allotted by the Government/Employer for personal gain, laundering money, cheating investors in various schemes etc.,
Corruption is universal. It exists in all developed and developing countries in varying degrees, both in the public and private sectors, as well as in non-profit and charitable institutions. Corruption has its own grades and they range from liquor, women and social influence and finally liquid cash. Many lives have been ruined from bad vices like gambling, drinking, betting etc., and corrupt people are using these devices to ruin their rivals. Corruption is a major issue for most of the countries which adversely affe…

Homeopathy medicines - A Guide for the Old, Poor and the Needy people

The last stage in human life is Old age. At this stage old people will encounter negligence from others including their families in some worst cases. Not only this, they will develop self negligence. Due to Competitiveness, tension due to pressure of work, spending leisure time on viewing TV, Children's education etc., youth also neglects them. Though the youth have love and affection towards them , they are not spending sufficient time as expected  by the old people due to the  above reasons. Youth working in foreign countries is also one of the reasons.

As a  result, old  people  are getting mental imbalance. They feel  that their vast experience in dealing things and  their sacrifices  for the family have no recognition by their kith and kin.Neglected presence of the old  people in taking decisions in important family matters will lead them to distress and self non-attention over the diseases from which they suffer. As a result they develop a tendency  "What for we are to l…

Tapatraya (3 Cravings) of Humans and the suitable methods to suffice them

Tapatraya in Sanskrit, means 'The 3 Cravings (Anxieties)' of the Human Life. Trying for a thing or for a purpose with undue longing and anxiety is generally called as Tapatraya (Craving). This is the common man’s view. But spiritually this has got a different meaning, a meaning in true sense.

These three kinds of cravings termed as Tapatraya are  - 1. Aadhi Bhouthika (Physical), 2. Aadhi Dyvika (Mental), and 3. Adhyatmika (Spiritual).

The explanation of these three may differ from one school of thought to the other. But let us think according to our view.