With the popularity of smartphones and the increasing power of camera functions, more and more customers have reported that the display screens using dual-latch ICs are very poor. JiChuang North high cost-effective PWM IC series ICN205X, can solve the pain point of the double-latch products, so that the display will maintain a perfect display under the camera lens. So, what is the improvement of the camera effect of the ICN205X compared to the dual-latch IC? The following is observed through a set of tests.
The most popular rental P4.81 indoor and outdoor general-purpose products are used as test platforms to compare the photographing effects of mainstream dual-latch ICs and ICN205X in a certain industry. In order to ensure the fairness and objectivity of the test, we first adjust the brightness and color temperature to be exactly the same, and compare the photos at different shutter speeds. In addition, it should be noted that all the pictures in this article use the original picture without any treatment.
Ø Portrait comparison
Figure 1: 1/200 shutter, double latch IC on the left and ICN205X on the right.
Figure 2: 1/500 shutter, double latch IC on the left and ICN205X on the right.
Figure 3: 1/1000 shutter, double latch IC on the left and ICN205X on the right.
Figure 4: 1/2000 shutter, double latch IC on the left and ICN205X on the right.
Ø Dark theme screen contrast
Figure 5: 1/200 shutter, double latch IC on the left and ICN205X on the right.
Figure 6: 1/500 shutter, double latch IC on the left and ICN205X on the right.
Figure 7: 1/1000 shutter, double latch IC on the left and ICN205X on the right.
Figure 8: 1/2000 shutter, double latch IC on the left and ICN205X on the right.
Through the above test photos, you can draw the following conclusions:
1. Although the double latch product can achieve a refresh rate of 1920 or higher, the photo effect starts to deteriorate at 1/200 shutter speed, and more than 1/500 is completely unwatchable.
2. There is no scan line in some photos of the dual latch product, indicating that the refresh rate is sufficient, but there is still serious display distortion (Figure 2, Figure 6).
3. The quality of the picture taken by the PWM IC at 1/2000 shutter is still acceptable.
Ø Gray scale performance comparison
In addition to the camera effect is far superior to the double latch, the PWM IC's grayscale performance after the brightness is reduced is also significantly better.
Figure 9: The brightness is reduced to 50%, the left side is the double latch IC, and the right side is the ICN205X.
In addition to the above comparison, the PWM IC has the following advantages:
1. The number of loaded points is large without any loss of performance.
2. The data clock is low, which is good for EMI improvement.
3. Can eliminate the open cross.
4. A wide range of current gain adjustments can be achieved.
The LED display has entered the full-color era for more than 20 years. The driver IC, which plays a decisive role in the display effect, has gone through two technical stages, namely the universal constant current and the PWM constant current stage. The PWM constant current IC has a high display price because of its huge display effect. In order to meet the needs of customers to improve the refresh rate and do not want to bear huge cost pressure, double latch products came into being, and quickly became the main force in the middle. The user sees the doubled refresh rate number on the software interface, thinking that it has a better photo effect, in fact, this has not been achieved. Now all this will be completely subverted by the ICN205X, which will lead the industry into the PWM era. It is believed that in the near future, dual latch products will only exist in the lowest end market, and PWM will become the starting point of performance. Let us embrace the new era of LED display!
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