A visitor takes photos of an exhibit at the 26th edition of the Sign China expo in Shanghai, east China, Sept. 17, 2025. The three-day expo on advertising industry, which kicked off at Shanghai New International Expo Centre on Wednesday, showcases products and technologies including advanced advertising production equipment, advertising materials, LED advertising lighting, and LED displays brought by approximately 800 exhibitors from home and abroad. (Photo by Pan Zongyuan/Xinhua)

People visit the 26th edition of the Sign China expo in Shanghai, east China, Sept. 17, 2025. The three-day expo on advertising industry, which kicked off at Shanghai New International Expo Centre on Wednesday, showcases products and technologies including advanced advertising production equipment, advertising materials, LED advertising lighting, and LED displays brought by approximately 800 exhibitors from home and abroad. (Xinhua/Liu Ying)

Visitors learn about a see-through LED display at the 26th edition of the Sign China expo in Shanghai, east China, Sept. 17, 2025. The three-day expo on advertising industry, which kicked off at Shanghai New International Expo Centre on Wednesday, showcases products and technologies including advanced advertising production equipment, advertising materials, LED advertising lighting, and LED displays brought by approximately 800 exhibitors from home and abroad. (Xinhua/Liu Ying)

People visit the 26th edition of the Sign China expo in Shanghai, east China, Sept. 17, 2025. The three-day expo on advertising industry, which kicked off at Shanghai New International Expo Centre on Wednesday, showcases products and technologies including advanced advertising production equipment, advertising materials, LED advertising lighting, and LED displays brought by approximately 800 exhibitors from home and abroad. (Photo by Pan Zongyuan/Xinhua)

A visitor learns about a 3D printing device for the production of advertising signs at the 26th edition of the Sign China expo in Shanghai, east China, Sept. 17, 2025. The three-day expo on advertising industry, which kicked off at Shanghai New International Expo Centre on Wednesday, showcases products and technologies including advanced advertising production equipment, advertising materials, LED advertising lighting, and LED displays brought by approximately 800 exhibitors from home and abroad. (Xinhua/Liu Ying)

People visit the 26th edition of the Sign China expo in Shanghai, east China, Sept. 17, 2025. The three-day expo on advertising industry, which kicked off at Shanghai New International Expo Centre on Wednesday, showcases products and technologies including advanced advertising production equipment, advertising materials, LED advertising lighting, and LED displays brought by approximately 800 exhibitors from home and abroad. (Xinhua/Liu Ying)

Visitors learn about a see-through LED display at the 26th edition of the Sign China expo in Shanghai, east China, Sept. 17, 2025. The three-day expo on advertising industry, which kicked off at Shanghai New International Expo Centre on Wednesday, showcases products and technologies including advanced advertising production equipment, advertising materials, LED advertising lighting, and LED displays brought by approximately 800 exhibitors from home and abroad. (Xinhua/Liu Ying)