Optical
Table 6. Optical Characteristics.
Luminance
Lon (areal), min | 40.0 cd/m² | Screen center, 120 Hz frame rate |
Lon (areal), typ | 65.0 cd/m² | Screen center, 120 Hz frame rate |
Loff (areal), max | 0.2 cd/m² | Center and four corners |
|
| |
All pixels fully lit | 35% | Maximum difference two of five points, |
|
| using the formula: |
|
| LNU%=[1- (min_lum/max_lum)] x 100% |
Luminance Variation (Temperature) |
| |
Maximum | 15% | Across operating temperature range |
Luminance Variation (Time) |
| |
Maximum | 20% | 10,000 hours at 25°C ambient |
|
|
|
Viewing Angle |
|
|
Minimum | 160° |
|
Contrast Ratio |
|
|
Minimum | 19:1 | @ 500 lux ambient, 120 Hz frame rate |
Typical | 50:1 |
|
Dimming
The scan rate dimming feature allows the brightness of the display to be lowered proportionally by reducing the scan rate. Scan rate dimming is performed within the application by lowering the scan rate of the video input signals. Because brightness is proportional to refresh rate, the display can be dimmed by adding pauses between every horizontal period.
The lowest possible frame rate (brightness) is dependent on the perceived flicker of the displayed image, but will most likely be around 60 Hz. For more information on scan/frame rate dimming please see Planar Application Note 120.
Generating Grayscales
Some applications may benefit by using grayscales. The AF1 has a maximum frame rate frequency of 120 Hz. Using the higher frame rate, combined with flat panel controllers designed for this faster display, it is possible to generate usable grays through frame rate control and dithering. Video controllers from manufacturers such as C&T and Epson use these methods with proprietary algorithms to generate grayscales.
The response time of ICEBrite displays is much faster than LCDs, therefore not all possible grayscales generated by the video controller are actually usable. Many of the grayscales may flicker or swim. Careful testing is necessary to select appropriate grayscales for an application, especially when the ICEBrite displays are driven at less than their maximum frame rate.
For additional information, refer to Planar Application Note 119 or contact Planar's Application Engineers.
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