本文发表在 rolia.net 枫下论坛Faster Cell Response and Better Color Depth
One key area of improvement is performance. A CRT can change the appearance of a pixel as quickly as it can turn an electron beam on and off. An LCD cell requires that the liquid crystal molecules actually move from one physical position to another. They are tiny and move rapidly, but not rapidly enough to showing moving images without artifacts. A typical specification is 25 to 40 ms, which is fast enough for 25 to 40 frames per second. The fact is, however, that most manufacturers base the specification on changing from on to off to on again. This is a "best-case scenario" as this is the cycle that most panels perform the fastest. The fact is that changing from one gray level to another takes much longer--as much as five times longer. As a result, moving images often appear to smear, losing detail. Mitsubishi has developed a new way to drive the cells to improve performance with their feed forward technology, but products using this technology are not expected to reach the market until later in 2002.
Another problem is color depth. CRTs enjoy nearly-infinite color response, as the control of the electron beam strength is essentially analog. LCDs rely on digital controllers, and while many are capable of 8 bits each for red, green, and blue--which can produce 16 million possible colors--some panels are limited to just 6 bits per color, or 262,144 colors. As a result, if you're doing work where color is important, such as editing photographs, the extra color response of a CRT may still provide more reliable and accurate images. (And keep in mind how changes in viewing angle can alter dark shades on an LCD.)
The bottom line is that many LCD panels still have downsides and room for improvement in certain usage scenarios that rely on response time and color accuracy, such as fast-action gaming or professional color graphics work.更多精彩文章及讨论，请光临枫下论坛 rolia.net
One key area of improvement is performance. A CRT can change the appearance of a pixel as quickly as it can turn an electron beam on and off. An LCD cell requires that the liquid crystal molecules actually move from one physical position to another. They are tiny and move rapidly, but not rapidly enough to showing moving images without artifacts. A typical specification is 25 to 40 ms, which is fast enough for 25 to 40 frames per second. The fact is, however, that most manufacturers base the specification on changing from on to off to on again. This is a "best-case scenario" as this is the cycle that most panels perform the fastest. The fact is that changing from one gray level to another takes much longer--as much as five times longer. As a result, moving images often appear to smear, losing detail. Mitsubishi has developed a new way to drive the cells to improve performance with their feed forward technology, but products using this technology are not expected to reach the market until later in 2002.
Another problem is color depth. CRTs enjoy nearly-infinite color response, as the control of the electron beam strength is essentially analog. LCDs rely on digital controllers, and while many are capable of 8 bits each for red, green, and blue--which can produce 16 million possible colors--some panels are limited to just 6 bits per color, or 262,144 colors. As a result, if you're doing work where color is important, such as editing photographs, the extra color response of a CRT may still provide more reliable and accurate images. (And keep in mind how changes in viewing angle can alter dark shades on an LCD.)
The bottom line is that many LCD panels still have downsides and room for improvement in certain usage scenarios that rely on response time and color accuracy, such as fast-action gaming or professional color graphics work.更多精彩文章及讨论，请光临枫下论坛 rolia.net