Re: question on LED-backlit displays
Re: question on LED-backlit displays
- Subject: Re: question on LED-backlit displays
- From: Steve Kale <email@hidden>
- Date: Sun, 17 Jun 2007 08:30:30 +0100
- Thread-topic: question on LED-backlit displays
Things are moving a lot faster in this space, powered by a little
NASDAQ-listed UK company:
http://www.cdtltd.co.uk/news/623.asp
(Interesting also that they can use printer technology to "print" displays)
We're more likely to see something from the SED space than OLED in the near
future.
> From: Robin Myers <email@hidden>
> Date: Sat, 16 Jun 2007 17:55:30 -0700
> To: <email@hidden>
> Subject: Re: question on LED-backlit displays
>
>
> On Jun 16, 2007, at 17:22 , Marco Ugolini wrote:
>
>> In a message dated 6/16/07 3:36 PM, Steve Upton wrote:
>>
>>> At 11:18 PM -0700 6/15/07, Marco Ugolini wrote:
>>>>
>>>> The way I understand it, LED backlighting allows for control over
>>>> the actual
>>>> color temperature of the light source itself, whereas the current
>>>> crop of
>>>> LCDs uses a fluorescent backlight whose color temperature cannot
>>>> be altered.
>>>
>>> this is only if the LED backlighting is supplied using a
>>> combination of red,
>>> green, blue (and perhaps other) LEDs
>>
>>
>> So, there is a possibility that the LEDs are single-source, not
>> triplets of
>> R, G and B light sources?
>>
>> Marco Ugolini
>
>
> Most high-brightness LEDs used for backlighting are "white" LEDs. The
> actual LED chip is a blue LED coated with a blue light excited yellow
> emitting phosphor. The phosphor allows some of the blue light to pass
> through so the result is blue plus yellow light, thus "white".
>
> Although single LED devices containing red, green and blue individual
> dies have been around for many years, they are not as bright as the
> white LEDs, so they are not usually used for backlights. High
> brightness LEDs are needed because the LCD they are backlighting
> greatly cuts the backlight intensity down before it gets out for us
> to view.
>
> Backlights using individual high brightness red, green and blue LEDs
> are possible, but they present a very challenging task to the optical
> designer to get the light to mix evenly in the narrow confines of a
> display.
>
> One technology that shows great promise for high brightness LED
> displays is Organic Light Emitting Diode displays, known as OLED
> displays. These are LEDs that can be created in large area patterns
> on glass and plastic substrates making large self-luminous displays.
> The main drawback to this technology is the lower lifetime of blue
> OLEDs, about 5000 hours right now. This would be about 2 years of
> 24/7 operation. Most people think that a 10000 hour lifetime is
> necessary for a viable full color OLED display. There are many
> companies working on this technology so we should be seeing some OLED
> displays in the near future.
>
> Robin Myers
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