With the growing popularity of smartphones and the ever-improving capabilities of their camera functions, many users have reported issues with displays using dual-latch ICs, particularly when taking photos. JiChuang North’s high-performance PWM IC series, ICN205X, addresses these pain points effectively, ensuring flawless display quality even under the camera lens. But just how much better is the photo quality when using ICN205X compared to dual-latch ICs? Let’s explore this through a series of tests.
To provide an objective evaluation, we used the widely adopted rental P4.81 indoor/outdoor general-purpose products as our test platform. We compared the photographic effects of leading dual-latch ICs against ICN205X, adjusting both brightness and color temperature to match precisely. Additionally, we tested across various shutter speeds to capture a comprehensive view. All images presented here remain untouched, using the original photos.
Below is a table outlining the application scenarios, brightness ranges, and shutter speed ranges used during testing:
| Application Scenario | Brightness Range | Camera Shutter Range |
|----------------------------|---------------------|----------------------|
| Indoor Studio | 500-800cd | 1/100-1/300 S |
| Indoor Stage | 800-1200cd | 1/400-1/600 S |
| Semi-Outdoor Stage | 3000-4000cd | 1/800-1/1500 S |
| Outdoor Sports/Advertising | 6000-8000cd | <1/2000 S |
### Portrait Comparison
**Figure 1: 1/200 Shutter Speed**
- Dual Latch IC (Left), ICN205X (Right)
**Figure 2: 1/500 Shutter Speed**
- Dual Latch IC (Left), ICN205X (Right)
**Figure 3: 1/1000 Shutter Speed**
- Dual Latch IC (Left), ICN205X (Right)
**Figure 4: 1/2000 Shutter Speed**
- Dual Latch IC (Left), ICN205X (Right)
### Dark Theme Contrast
**Figure 5: 1/200 Shutter Speed**
- Dual Latch IC (Left), ICN205X (Right)
**Figure 6: 1/500 Shutter Speed**
- Dual Latch IC (Left), ICN205X (Right)
**Figure 7: 1/1000 Shutter Speed**
- Dual Latch IC (Left), ICN205X (Right)
**Figure 8: 1/2000 Shutter Speed**
- Dual Latch IC (Left), ICN205X (Right)
From these tests, several key findings emerge:
1. Despite achieving a refresh rate of 1920 or higher, dual-latch products begin to show degraded photo quality at 1/200 shutter speed, becoming nearly unusable beyond 1/500.
2. Some dual-latch product images lack scan lines, suggesting sufficient refresh rates, yet they still exhibit significant display distortion (Figures 2 and 6).
3. The PWM IC maintains acceptable photo quality even at 1/2000 shutter speed.
### Gray Scale Performance
In addition to superior photographic effects, PWM ICs also outperform dual-latch ICs in gray scale performance, especially under reduced brightness levels.
**Figure 9: Reduced Brightness (50%)**
- Dual Latch IC (Left), ICN205X (Right)
PWM ICs also offer additional benefits:
1. Support for a larger number of loaded points without performance degradation.
2. Lower data clock, improving EMI performance.
3. Elimination of open cross issues.
4. Adjustable current gain over a wide range.
LED displays have been in the full-color era for over 20 years, with driver ICs playing a crucial role in display quality. These ICs have evolved through two major stages: universal constant current and PWM constant current. While PWM ICs deliver superior display effects, they come at a premium price. To cater to customers seeking improved refresh rates without excessive costs, dual-latch products emerged and quickly dominated the mid-range market. However, users often misinterpret the higher refresh rate numbers as better photo quality, which isn’t always true. ICN205X is set to revolutionize the industry by ushering in the PWM era. In the near future, dual-latch products may only survive in the lowest-end markets, while PWM becomes the standard for performance. Welcome to the new era of LED displays!
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