Optical Performance; Dimming; Generating Grayscales; Table 6. Optical Characteristics - Planar EL640.480-AF1 User Manual

Optical

Table 6. Optical Characteristics.

Luminance
L (areal), min
on
L (areal), typ
on
L (areal), max
off
Non-uniformity
All pixels fully lit
Luminance Variation (Temperature)
Maximum
Luminance Variation (Time)
Maximum
Viewing Angle
Minimum
Contrast Ratio
Minimum
Typical

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.
10 EL640.480-AF1 VGA Operations Manual (020-0349-00A)
40.0 cd/m² Screen center, 120 Hz frame rate
65.0 cd/m² Screen center, 120 Hz frame rate
0.2 cd/m² Center and four corners
35% Maximum difference two of five points,
using the formula:
LNU%=[1- (min_lum/max_lum)] x 100%
15% Across operating temperature range
20%
10,000 hours at 25°C ambient
160°
19:1 @ 500 lux ambient, 120 Hz frame rate
50:1