转个CASIO a240 评测

flight5581

最近热门讨论的机子

http://www.avsforum.com/avs-vb/showthread.php?t=1214089&page=11

小熊维尼

看一下。[s:15]

小熊维尼

英文水平[s:18] ，得慢慢看。

shine533

赶快翻译  金山


[ 本帖最后由 shine533 于 2010-6-8 10:11 编辑 ]

shine533

Left is Casio XJ-240 on Eco 2 (lowest), right is LG HS201 on highest brightness. Projected onto a wall (Dulux Whisper White paint). Photos are taken with a Samsung WB550.
Sorry for the crappy photo but it does show the different colour tints of the 2 PJ

shine533

卡西欧 在这张图里 红色 看起来比较暗  下面的几张视频截图也是 。。。

tonyfeng

[s:20] 顶起来![s:68]

shine533

The color red is saturated it's true, you need to reduce it (-10) for me............................锤子老

shine533

现在颜色 基本没大问题，就剩到底有没有彩虹，还有那个镜头那么小投130 150会不会存在变形，一般短焦好像镜头都蛮大的

wete

借楼主的地盘补充一条相关消息：Casio LED/Laser Hybrid Update
Evan Powell — Jun 3, 2010
We are still waiting for a statement from Casio regarding the brightness issues we've seen on the new LED/Laser Hybrid light engines. But in the meantime, we have some more test results to share...

Since we have had a total of five units in house, we've been able to do some extended usage testing to see if the Hybrid light engine maintains its brightness and color characteristics over time. Our findings thus far are that maximum lumen output drops over the first 100 hours of use. On one of our XJ-A130s, the max lumen output was 1228 when it was new. After 130 hours of use its maximum brightness dropped to 949 lumens, which is a 23% reduction.

The Casio User's manual indicates that the high altitude mode of operation (which increases fan speed and audible noise) is recommended at elevations above 3300 feet. We do our testing at 3100 feet. Since this is close to the limit, we decided run a second test with the high altitude fan engaged. The second unit started with a maximum reading of 1630 lumens, and after 100 hours of run time its maximum lumen output had dropped to 1470, or a 10% drop.

Two notes of caution are in order. First, in order to get 100+ hours of use on these test units, they were run with a 100 IRE white test pattern continuously, 24 hours per day. This is not the way people normally use products of this type. We do not know whether brightness degradation is exaggerated by continuous use. More testing of a wider array of samples under different usage conditions would be required to support any definitive conclusions.

Second, we do not know the degree to which our 3100 foot elevation is affecting results. It may be that brightness degradation would proceed at a slower pace at sea level. Though the test unit with the high altitude fan engaged has diminished less over the first 100 hours of use, this was a much brighter unit to begin with. Furthermore, it draws 178 watts in full power operation, whereas the dimmer test sample draws only 138 watts. There are too many variables, and not enough test data, to draw any certain conclusions.

We have noticed another interesting phenomenon as a result of the extended usage test. Color balance on the first of the two units (the one which now measures 949 lumens) actually improved after 130 hours of use. Initially the picture had excessive blue and green components with very little red. Now it looks more neutral, with red coming more into balance with green and blue. It appears that the red component, which comes from the LED, remains relatively stable in its light output, while the blue and green that are produced by the laser diminish over time, causing the unit to trend toward a more neutral color balance.

So far we have seen this on just the dimmer of the two test samples. The brighter of the two units still shows a significant weakness in red, and color balance on this sample is quite poor.

We will continue to run these units to see what further developments ensue. And we will report any information forwarded to us by Casio once they have had a chance to evaluate the issues at hand.

Evan Powell
Editor
Comments (3)
Topics: Casio, Mobile Presentation
Reader Comments(3 comments)
Posted Jun 7, 2010 12:51:22 PM
By Evan Powell Post a Comment Alert Moderator  

Kevin, I presume the reason they did not use LED for the green channel was that it is not bright enough. The objective of the laser was to boost light output. Not using it for the green channel would have largely negated the design strategy.

Chris, the tendency for high pressure lamps to degrade in brightness over time is well known, so we have not tested that recently. The reason we are running the tests on these new hybrid engines is that they are represented as being stable and not subject to lumen degradation. If this were true, it would be a competitive advantage over high pressure lamps. However, our initial tests indicate that they do degrade in brightness over time. We do not have enough test data to form any conclusions about whether they degrade faster than conventional high pressure lamps, or how they might compare to brightness curves of UHPs after thousands of hours of use.
Posted Jun 7, 2010 11:23:44 AM
By chris Post a Comment Alert Moderator  

I'm excited that you are testing more LED projection systems. However, have you ever done the lumens times test on mercury vapor lamps? What does the brightness curve look like for the most highly rated units you've tested this year?
Posted Jun 6, 2010 4:27:21 AM
By kevinp Post a Comment Alert Moderator  

I like the idea of using green tech. but am confused as to why Casio didn't use a green LED with red & blue lasers. I am wondering if it has anything to do with speckle. Is there any speckle produced by the blue laser ?

shine533

流明下降？红色弱？？

海诺婚礼策划

费电噢

shine533

不过 连续100开小时 。。。。一般机器早炸了

ponyfan

其实看这个评测。可以得到一些结论的。

1、相对使用时间对衰减的影响来说，温度影响更大。
     原因：第一台第二台使用只差30小时，但是衰减差了13% 区别就是开没开高海拔模式
               很明显开了高海拔模式后散热更好了，衰减更小了。
               也就是说，做好散热的话（一般家里热了都会开空调吧），因为使用时间而导致的衰减是较小的。

2、普通家用的衰减估计不会很严重。
     原因：测试是在3100海拔 最高流明 24小时连续开机 100% 全白画面输出（所有光源最大功率），衰减10%
                根据上面的结论，家用不会最高流明所以温度不会高，不会24小时，有时间散热，不会全白画面就损耗更少。
                这里还没有考虑网上流传的。激光本身前200小时需要堡机的说法

3、130小时后颜色更好了
       不知道是使用时间关系，还是亮度衰减关系导致的这个结论。但是反正是越用越好了。。。


根据以上结论。 个人猜测未来这个机器的褒机方案：

最低流明下，空调间，每开1小时休息散热一次， 连续150小时后。
流明没有怎么下降，但是颜色已经好了。

哈哈哈

[ 本帖最后由 ponyfan 于 2010-6-9 12:00 编辑 ]

zly2002

转个隔壁论坛 对这个问题的观点:

http://www.av199.com/thread-291223-1-1.html  

精华引用(精华之在前面的部分! ) :

"闲来无事，毒版又忙，俺就越俎代庖了

We are still waiting for a statement from Casio regarding the brightness issues we've seen on the new LED/Laser Hybrid light engines. But in the meantime, we have some more test results to share...

虽然已经看过卡西欧的激光LED混合光源的亮度表现，但我们还在等待卡西欧官方提供的说明文件。不过现在我们已经有一些测试结果可以与大家分享了。

Since we have had a total of five units in house, we've been able to do some extended usage testing to see if the Hybrid light engine maintains its brightness and color characteristics over time. Our findings thus far are that maximum lumen output drops over the first 100 hours of use. On one of our XJ-A130s, the max lumen output was 1228 when it was new. After 130 hours of use its maximum brightness dropped to 949 lumens, which is a 23% reduction.

我们现在手头有五台机器，所以我们可以做一些扩展性的使用测试来看看混合光源投影机在长时间使用下是否依然保证其亮度和色彩的特点。 到目前为止我们发现新机使用超过100小时后最大流明输出会下降。我们手头的其中一台XJ-A130, 开箱时最大流明输出1228流明，但使用过130小时之后其最大流明输出降为949流明，降幅达23%。

The Casio User's manual indicates that the high altitude mode of operation (which increases fan speed and audible noise) is recommended at elevations above 3300 feet. We do our testing at 3100 feet. Since this is close to the limit, we decided run a second test with the high altitude fan engaged. The second unit started with a maximum reading of 1630 lumens, and after 100 hours of run time its maximum lumen output had dropped to 1470, or a 10% drop.

卡西欧的用户手册里提到在海拔3300英尺（1006米）以上使用时建议开启高海拔模式（此模式下风扇速度和噪音明显增加）我们的测试环境为海拔3100英尺（945米） 因为海拔高度差不多，我们决定在高海拔模式下进行第二次测试。 这次测试结果是第二台机器开机最大流明输出1630流明，运行100小时后最大流明输出降为1470流明，降幅为10%。

Two notes of caution are in order. First, in order to get 100+ hours of use on these test units, they were run with a 100 IRE white test pattern continuously, 24 hours per day. This is not the way people normally use products of this type. We do not know whether brightness degradation is exaggerated by continuous use. More testing of a wider array of samples under different usage conditions would be required to support any definitive conclusions.

提出两点值得注意的地方，第一点，为了在这些测试样机上获得100小时以上的测试结果，我们采取了24小时连续不间断的100 IRE全白画面测试，通常人们是不会这么来使用投影机的。 但我们不确定所测得的亮度衰减是否是由于连续使用过长时间所造成的。 这需要更多的样机在其他不同使用条件下来进行更多的测试才能得出最终的结论。

Second, we do not know the degree to which our 3100 foot elevation is affecting results. It may be that brightness degradation would proceed at a slower pace at sea level. Though the test unit with the high altitude fan engaged has diminished less over the first 100 hours of use, this was a much brighter unit to begin with. Furthermore, it draws 178 watts in full power operation, whereas the dimmer test sample draws only 138 watts. There are too many variables, and not enough test data, to draw any certain conclusions.

第二点，我们还不确定3100英尺（945米）测试环境的海拔高度对测试结果的影响程度到底有多少。 有可能在海拔较低的地方亮度衰减程度会较低。 虽然那台测试样机开启高海拔模式后使用100小时亮度削弱的更多，但那台也是所有样机中初始亮度更高的一台。 另外那台高海拔模式测试样机全功率模式工作下测得功率为178瓦，而初始亮度较低的样机仅测得138瓦。 所有不确定性因素很多，并且得不到足够的测试数据来做出任何确定的结论。


We have noticed another interesting phenomenon as a result of the extended usage test. Color balance on the first of the two units (the one which now measures 949 lumens) actually improved after 130 hours of use. Initially the picture had excessive blue and green components with very little red. Now it looks more neutral, with red coming more into balance with green and blue. It appears that the red component, which comes from the LED, remains relatively stable in its light output, while the blue and green that are produced by the laser diminish over time, causing the unit to trend toward a more neutral color balance.

我们在此次扩展性使用测试中还发现了一个有意思的现象。 上述测试的第一台机器（就是亮度降为949流明的机器）使用超过130小时之后，其色彩平衡反而有所改善。起初这台机器的画质显得蓝色和绿色过分而红色不足， 但现在看上去更自然一些，红色在增加从而使得三原色更平衡。 其缘故应该由于红色是由LED光源提供的，亮度输出相对稳定，而蓝色和绿色是由激光光源提供的，而这部分会随着使用时间而衰减，最后导致随着使用时间的递增画面反而更自然。
So far we have seen this on just the dimmer of the two test samples. The brighter of the two units still shows a significant weakness in red, and color balance on this sample is quite poor.

我们在目前为止的两台样机中初始亮度较低的那台上看到了这个现象，而初始亮度较高的那台投射出的画面依然红色表现很弱，色彩平衡较差。

We will continue to run these units to see what further developments ensue. And we will report any information forwarded to us by Casio once they have had a chance to evaluate the issues at hand.

我们将继续测试这些样机来获得更多进展，并且我们将会公布我们所获知的任何卡西欧针对目前情况所作出的评估消息。

Evan Powell
Editor

伊万 鲍威尔
编辑

个人的一点感想
激光光源的蓝绿色表现毋庸置疑，但主管蓝色和绿色的激光光源和主管红色的LED光源的衰减速度不同步性是个问题，色彩平衡性会不会随着使用时间的推移而进一步变化呢，看来索尼研发三原色激光即红绿蓝三色均由激光光源提供的家用机不无道理。

[ 本帖最后由 hucs2006 于 2010-6-8 06:18 PM 编辑 ]     "