Application Of 23.8 Inch High Brightness LCD Screens In Medical Equipment

Edge brightness is 10–20% lower than the center, creating a "dark corner" effect that can cause misreading in edge areas of ultrasound images. Inconsistent aging of LED backlight chips: Consumer-grade screens experience brightness decay to 87% of their initial value after 18 months; medical-grade screens require mandatory "brightness margin" compensation in their design. Edge-lit structures, in a 23.8" size, have a longer light guide path, making uniformity control significantly more difficult than with direct-lit structures.

IPS LCDs have a contrast ratio of approximately 1000:1. However, the backlight cannot be completely turned off, resulting in light leakage at the black level, which makes them inferior to OLEDs in recognizing details in dark areas (such as bile ducts and small lesions). While Mini-LED local dimming can improve local contrast, there is an engineering challenge in balancing the number of local dimming zones required for a 23.8" screen with cost. High-brightness mode (1000 nits+) under strong ambient light in operating rooms is inversely related to contrast ratio; achieving both simultaneously is extremely technically challenging.

Medical device certification (FDA 510k, IEC 60601) takes 1-3 years. If a panel model is discontinued, the entire device must be recertified, incurring extremely high costs. The market demands a panel supply lifespan of over 5-10 years, but consumer LCD production lines only have a 2-3 year iteration cycle. Medical OEMs face a severe risk of supply disruptions. 23.8" is a shared size for both consumer and medical applications. Panel manufacturers prioritize supplying the high-margin consumer market, leaving them with weak bargaining power for small-batch medical orders.

The IP65 front panel waterproof requirement clashes with the internal heat dissipation channel design: better sealing leads to more severe heat buildup, directly shortening the LED backlight lifespan. Fanless design is a mandatory requirement for ICUs and cleanrooms, but passive heat dissipation solutions for 1000-nit high-brightness backlights are costly in terms of size and weight. Long-term corrosion of the touchscreen coating (AG anti-glare layer) by disinfectants leads to decreased light transmittance, touch malfunction, and higher maintenance frequency than ordinary industrial screens.