REVIEW: HP LP2065 Part 10
Hewlett Packard did not want to give away any details on what exact panel is being used in the LP2065; we were merely told that it employed Overdrive and that the Overdrive function was a development by the producer of the panel. However, this information is enough for one to be able to safely assume that the panel at hand is an S-PVA panel by Samsung which makes use of Samsung's Overdrive Technology ADCC (Advanced Dynamic Capacitance Compensation).
HP specifies the maximum contrast of this LCD monitor at 800:1.This accounts for a high contrast range and good black level. The maximum brightness is said to amount to 300 candelas per square meter (cd/sqm).We crosschecked the brightness and obtained a minimum value of 86 cd/sqm. The maximum brightness achievable with this monitor was just about 196 cd/sqm, which marks a significant deviation compared to the substantially higher manufacturer specs.
Nevertheless, under regular lighting conditions, the maximum brightness of this LCD is sufficient. The minimum brightness can be further reduced by toning down each of the color channels red, green and blue by the same amount. Given normal lighting conditions, a brightness level of 140 cd/sqm is considered to be the ideal setting; on the HP LP2065 this corresponds to the standard contrast setting of 80 percent and a brightness setting of 44 percent.
At a contrast ratio of 10:1 the viewing angles of HP LP2065 amount to 178 degrees both horizontally and vertically, according to Hewlett Packard. And this holds true in practice as well, since contrast and colors remain stable in a wide range and color shifts will not begin to reveal itself until viewing positions of 170 degrees are exceeded. Thus, the viewing angle stability offered by HP LP2065 is very good.
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Left picture: viewing angle from the right; right picture: frontal view
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The two pictures above illustrate the integrity of the picture quality respectively when viewed from below and from above
The brightness uniformity of our review unit is flawless, revealing absolutely no brightness irregularities, - neither in border areas nor elsewhere. In terms of brightness uniformity, the HP LP2065 is among the very best LCD monitors that we have reviewed so far. It should also be pointed out, however, that the brightness uniformity of LCDs is always subject to a certain degree of deviations in series production.
The HP LP2065 is capable of reproducing 8 Bits per RGB color which amounts to a total of 16.7 million colors, thus covering the standard color space used in the PC industry. The image quality of this LCD is excellent; this shows in test runs with color gradients as well as with test pictures, and is further backed up by our measured data.
We calibrated the colors of the HP LP2065 by means of the Colorimeter Silver Haze Pro (x-rite Model DTP94) and the iColor Software by Quatographic. Afterwards, we measured the reproducible color space and color accuracy.
Calibration:
| Reference | Measured | |
| Gamma | 2.2 | 2.2 |
| Kelvin | 6500 | 6522 |
| cd/m2 | 140 | 140 |
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Measurement charts: Click illustrations for enlarged view and explanation
The HP LP2065 can handle a large color space, while its level of color accuracy is very good, coming close even to displays featuring a 10 Bit Look-Up table. Therefore, both color space and color accuracy delivered make this monitor lend itself for non-standard applications such as picture editing, design and graphics work.
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