LCD monitors are not unfamiliar to people, and you can see them in color{{0}}screen mobile phones, laptops and digital cameras that you usually see. If you buy a laptop and find that there is a bright spot on the LCD after using it, you will definitely find a business "theory". If you can't agree with the business, you will even resolve it with the Consumers Association. But in this case, if the two parties do not negotiate well, the Consumers Association often has no good solutions. Because the current national quality standards for the bright spots of liquid crystal displays are still blank, for now, it is up to each manufacturer to decide whether the "bright spots" problem is a quality problem like the above assumption. The standards customized by each manufacturer are not the same, ranging from "0 bright spots" to "7 bright spots" as qualified standards. There is even no place for quality testing, because the country has not yet issued testing standards. The lag in the introduction of quality and testing standards has affected the rights and interests of consumers and the popularity of LCD products. The author calls on relevant departments to issue quality and testing standards for LCD products as soon as possible. Many consumers pay attention to response time, price, warranty, and panel conditions when purchasing LCD monitors. But do you know that even behind the information that you think you have clearly understood, there are still many unclear questions.
وقت الاستجابة
قام المركز الوطني لمراقبة وفحص جودة الكمبيوتر الإلكتروني مؤخراً بتفتيش شاشات LCD. من بين أكثر من 10 علامات تجارية و 22 طرازًا من المنتجات ، لا يمكن تشغيل طراز واحد للشاشة بشكل طبيعي ، ويتجاوز مؤشر الاختبار الفعلي لنماذج 12 من المنتجات الفهرس المشار إليه. ، معدل التأهل لوقت استجابة العينة هو 42 بالمائة فقط. من بينها ، يبلغ مؤشر وقت الاستجابة الفعلي للمنتجات الفردية 26.6 مللي ثانية ، ولكن في المؤشرات المذكورة ، يبلغ اسميًا 16 مللي ثانية. وأشار المركز الوطني للرقابة على جودة الحاسبات الإلكترونية والفحص إلى أن مؤشرات الاختبار الفعلية لوقت الاستجابة لمعظم العينات تجاوزت بشكل أو بآخر المؤشرات المذكورة ، مما يدل على أن مشكلة عدم صحة مؤشر مؤشرات زمن الاستجابة لشاشة العرض البلورية السائلة أكثر أو أقل. مسطحة. من بينها ، أصبح وقت الاستجابة وعيوب النقطة (مستوى لوحة الكريستال السائل) من النقاط الساخنة للمضاربة من قبل بعض الشركات المصنعة والمستهلكين.
For such a low pass rate in this test, the person in charge of the LCD manufacturer believes that the response time indicated by the manufacturer is the peak value of the display speed that the LCD can achieve under certain circumstances, not the average speed. For the response time, the manufacturer generally calculates it according to the typical value and the maximum value. The nominal response time on the display is actually a response speed in the ideal state of the display. The response time is divided into "rising response time" plus "falling response time", that is, the time it takes for a pixel to change from black to white (rising), and then from white to black (falling). The corresponding time on the product label should be the total value of the rise time plus the fall time. However, some businesses only mark the rise (or fall) response time as the response time of the liquid crystal.
The industry still lacks standards for testing the response time of liquid crystals. This means that manufacturers can choose different methods to indicate the response time of their products. The lack of standards for the classification of LCD panels is often hidden in the familiar slogans such as AA-level panels and A plus -level panels. According to reports, the number of dead pixels, bright spots and dark spots of the LCD panel, as well as indicators such as color purity and viewing angle, constitute the three levels of A, B, and C of the LCD panel. However, different LCD panel manufacturers have different grading conditions for their products: some manufacturers define LCD panels with less than 3 "point defects" as Class A, and some manufacturers define LCD panels with 5 or less "point defects" The panel is defined as Class A, and LCD panels without any "point defects" are also classified as Class A plus plus , Class A plus , and so on.
For the time being, there is no unified domestic standard for panel grade classification, but everyone in the industry formulates their own standards according to some default rules. For example, what you call A-level panels are panels that have outstanding performance in terms of viewing angle, contrast, and brightness. Although the "industry standard" has defined the panel grade, the industry believes that in this case, it is difficult for consumers to determine the grade and quality of the panel. More importantly, the division of A and B panels by panel manufacturers does not simply depend on the number of dead pixels, but starts from comprehensive indicators such as uniform brightness and color saturation. In this way, consumers have no way to start. In addition, some manufacturers only stated that they use Class A panels in their publicity, but they did not explain how they are defined. The National Computer Quality Supervision and Inspection Center stated that it is precisely because different LCD panel manufacturers have inconsistent requirements for the corresponding conditions of A, B, and C levels. There is confusion among consumers.
Standards lagging consumers' rights and interests are difficult to guarantee
It is understood that the existing GBT9813-2000 "General Specifications for Microcomputers" Appendix C "LCD Dead Pixel Acceptance Standards", SJT11292-2003 "General Specifications for Computer Liquid Crystal Displays" Appendix A "Acceptable Failure Points" is for computer LCD monitors The dead pixels or failure points ("white dots" or "black dots") are clearly defined. Among them, the maximum applicable size of GBT9813-2000 "General Specification for Microcomputers" is only 14 inches, so it has been lagging behind the current LCD market development. The "General Specification for Computer Liquid Crystal Displays" released in 2003 has been in line with the international standard ISO13406-2. However, as an industry standard, it remains to be seen when it will become a national standard.
في حالة عدم وجود معايير وطنية أو صناعية جديدة ، يجب على جميع مصنعي شاشات الكريستال السائل أن يطبقوا بشكل موحد المعيار الدولي الحالي ISO13406-2 ، والذي تم تحديثه في عام 2001 لتحديد مؤشرات الأداء الحساسة لمنتجات شاشات الكريستال السائل لتجنب التسبب في مبيعات السوق. تسبب في ارتباك في الدعاية.
ومع ذلك ، فحتى أقرب معيار ISO13406 - 2 لنا متأخر حتمًا. تنص ISO13406 - 2 على أن شاشات LCD مقاس 15 بوصة لا يمكن أن تحتوي على أكثر من نقطة مضيئة واحدة ونقطة داكنة واحدة وثلاث نقاط لونية. ومع ذلك ، فمن الواضح أنه نظرًا لصياغة معيار 13406-2 في وقت سابق ، عند مواجهة شاشات LCD كبيرة الحجم مثل المنتجات مقاس 17 بوصة و 19 بوصة ، سيواجه المستهلكون موقفًا محرجًا: وفقًا للحساب القياسي ISO13406-2Class2 17 تسمح شاشة LCD مقاس بوصة بنقطتين ساطعتين و 2 نقطتين داكنتين و 6 نقاط لونية. بالنسبة للمستخدمين ، من الواضح أنه من غير المقبول وجود 10 بكسلات ميتة على الشاشة. لذلك ، بالنسبة للمصنعين الذين تبنوا Class2 باستمرار ، يجب تنفيذ معايير Class1 على شاشات كبيرة ، وهو أمر سهل نسبيًا وفقًا للإمكانيات التقنية الحالية ، أو يجب صياغة معيار جديد لتصنيف الجودة. لذلك ، يعتقد بعض العاملين في الصناعة أن معايير شاشات الكريستال السائل المحلية والدولية الحالية متخلفة نسبيًا عن الركب. إن حساب عدد وحدات البكسل الميتة وما إذا كان وقت الاستجابة يجب أن يعتمد على التدرج الرمادي ، وتستحق المؤشرات الأخرى بحثًا أكثر تفصيلاً.
