With the growing popularity of smartphones and the continuous enhancement of camera capabilities, an increasing number of users have noticed that displays equipped with dual-latch ICs often suffer from poor performance when photographed. This issue has been a major concern for many customers, prompting JiChuang North to develop its high-performance PWM IC series, the ICN205X. This innovative solution effectively addresses the shortcomings of dual-latch products, ensuring smooth and flawless visuals even under the scrutiny of a camera lens. But how does the ICN205X stack up against traditional dual-latch ICs in terms of camera performance? To answer this question, let's explore the results of a series of comparative tests.
For our experiments, we chose the widely-used P4.81 indoor/outdoor rental panels as our test platform, comparing the photographic outcomes of leading dual-latch ICs with those of the ICN205X. To guarantee fairness and accuracy, we meticulously adjusted both brightness and color temperature to match perfectly across all tests. Additionally, we captured images at various shutter speeds, ensuring a comprehensive evaluation. All photographs featured here are presented in their original form, untouched by post-processing.
*Figure 1: At 1/200 shutter speed, the dual-latch IC is on the left, while the ICN205X is on the right.*
*Figure 5: At 1/200 shutter speed, the dual-latch IC is on the left, and the ICN205X is on the right.*
From these tests, several key observations emerged:
1. Despite boasting a refresh rate of 1920 or higher, dual-latch products begin to show noticeable degradation in photo quality at a shutter speed of 1/200, becoming entirely unusable beyond 1/500.
2. While some images from dual-latch products appear free of scan lines, indicating adequate refresh rates, they still exhibit significant display distortions (Figures 2 and 6).
3. Even at 1/2000 shutter speed, the picture quality captured by the PWM IC remains acceptable.
In addition to outperforming dual-latch ICs in photographic quality, the PWM IC also excels in grayscale performance, especially when brightness levels are reduced. For instance, at 50% brightness, the PWM IC offers far superior grayscale reproduction compared to its dual-latch counterpart (Figure 9).
Beyond photographic quality and grayscale performance, PWM ICs offer several additional advantages:
- They support a larger number of loaded points without compromising performance.
- They operate at lower data clock speeds, improving EMI performance.
- They eliminate open-cross issues.
- They provide a wide range of current gain adjustments.
The LED display industry has evolved over more than two decades, transitioning from universal constant current to PWM constant current technologies. While PWM ICs deliver exceptional visual performance, their high cost has limited their adoption. As a result, dual-latch products emerged to provide enhanced refresh rates at a more affordable price point. However, the ICN205X now redefines the standard, ushering in a new era of LED displays characterized by superior performance and image quality. It’s clear that dual-latch products will soon be confined to the lowest tiers of the market, while PWM technology becomes the norm. Join us as we embrace the next chapter in LED display innovation!
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