Since I have not seen a professional article to thoroughly analyze the Redmi Note2 screen, as a professional player, using a strong industrial circle, deep dismantling, quantitative analysis of the specific situation of several mobile phone display screens with professional data. For the majority of electronic device enthusiasts reference.
Red rice Note2 teardown analysis
In order to deeply study the material of the Gossip mobile phone Red Rice Note2, a red rice Note2 was specially prepared for destructive dismantling. Our dismantling is very different from the dismantling seen on major websites. The difference is that we disassemble more thoroughly and analyze more deeply. It can help users to identify the materials used in mobile phones, and the quality is too good. turn off. Therefore, in the future, there will be problems with quality problems, and you will know when you split them! In the future, the masters of the flagship model should be careful. If the machine is not afraid of dismantling, it will take the blood to remove it.
The back cover of Red Rice Note2 can be removed directly, and the battery is also detachable. Therefore, our red rice mobile phone disassembled from the back cover and removed to the touch screen. The picture below shows the back cover, battery and motherboard parts of the red rice phone:
The hardware part of the Redmi Note2 phone
After the hardware part is removed, our screen part is disassembled. This article mainly discusses the screen part, so we skip the hardware part of the phone and directly discuss the screen details of Redmi Note2.
Backlight disassembly
The screen of Redmi Note2 was bonded using a special sticky tape. After removing the screen, we can see that the last side of the screen is a reflective material with some codes printed on it. This kind of reflective diaphragm is the most reflective sheet on the market, and the supplier is the famous 3M. At present, almost all of the high-end models have used this kind of reflective material, because the use of ESR as a reflection sheet can increase the axial brightness of the screen by more than 10%.
Structure after the screen is disassembled
From the module information on the reflection sheet, it can be seen that the module number is TL0XXX. It is known that this module comes from the domestic old-fashion panel manufacturer Tianma Group, who makes it professional.
Let's take a look at the material used in this screen.
After removing the ESR reflector and the light guide, we can see the backlight and LED of the LCD:
The strength of the powerful industry chain is not casual. The optical film used in this backlight module is actually a 3M optical brightness enhancement film. This combination of brightness enhancement film is generally found in high-end mobile phones. of. The upper and lower prismatic films help to adjust the backlight direction to the viewing direction of the human eye and increase the axial brightness of the screen. 3M APF multilayer film can help increase screen brightness, which is more than 40% higher than APF-free screen.
Red rice Note2 backlight structure summary
Touch screen disassembly
After analyzing the backlight, let's take a look at the LCD and touch module materials. First look at the external trace, from the display module's trace, the upper end has a small chip and data line, this is the touch IC and touch screen cable. There is a long signal line below the display, this is the signal line of the LCD.
Let's take a look at the pixel structure of the display. From the perspective of pixel arrangement, this screen is indeed IPS technology, and the pixel has greatly improved than the red rice Note1.
The next step is the destructive disassembly that cannot be repaired. In order to see the overall structure of the touch screen, a mobile phone has to be sacrificed. Because the display module is the most technical part of the entire display industry, the touch screen and the LCD are difficult to separate. If you want to understand the detailed materials and structures, you must perform destructive dismantling. Fighting. Looking at the picture below, the screen of Red Rice Note2 has completely turned into a piece of material. By disassembling this module, they found that they used the ultra-thin GFF touch module. Cover Glass is only 0.5mm thick. This is the masterpiece of Berne, the leader in the cover glass industry. And then measure the upper and lower glass of the LCD screen, the thickness of which is only 0.37mm.
In addition to thin, Redmi Note2 was further optimized for narrow borders on the screen. The phone frame of Red Rice Note is 5.11mm, and the frame of the phone of Redmi Note2 is 3.76mm. It can be seen that the LTPS LCD screen of Tianma has helped the red rice Note2 to achieve thin and thin design.
Red rice Note2 display structure and materials
Screen display effect comparison
The red rice Note2 screen that has been criticized by netizens has been yellowing. When we opened the phone before disassembling, when comparing the quality of the red rice Note2, it was found that the screen of the red rice Note2 did have a yellowish phenomenon. The difference is more obvious under the white screen.
In order to study this problem in more depth, Mi Note1 and Xiaomi Note simultaneously compare the picture quality and see if there is any deception in the naked eye.
The phenomenon of display screen color shift is too subjective, and everyone's preferences and human eye systems are different. To accurately evaluate the color of the display, it is necessary to use professional equipment to measure. Xiao Cjun uses professional test equipment to capture the color and color temperature data of the entire screen, and then compare the color temperature of each mobile phone to determine whether there is color shift on each screen.
After professional equipment testing, it was found that the color temperature of the screen white screen before the red rice Note2 upgrade was 6331, and the color temperature of the white screen after the upgrade was 7516. The color temperature and the color temperature of Xiaomi Note and Red Rice Note were basically the same. It can be seen that the yellow screen of the red rice Note2 is caused by the software system, and it is not fake! The original picture quality of the screen is similar to other millet products.
Red rice Note2 upgrade system after the yellowing problem!
Three mobile phones white screen color temperature contrast
After testing the professional display test equipment, it was found that after the MIMI was upgraded by Redmi Note2, the brightness of the screen was improved and the color temperature was changed. In addition to the color temperature problem that has been hot on the Internet in the past few days, we have to look at the evaluation of a display screen. The resolution of the whole surface is not high, the brightness of the whole surface is uniform, the viewing angle is not big, and the color reproduction performance is good. Wait a minute. The following image is a picture taken using a microscope to view the display pixels of several mobile phones:
It can be seen that the red rice Note2 has more display pixels per unit area than the red rice Note 1, which means that the PPI is higher. After calculation, the PPI of Redmi Note2 is 400, while the PPI of Redmi Note1 is 267, so the PPI of Redmi Note2 is increased by 50%.
Display brightness distribution and viewing angle :
Display contrast :
Since the screen is IPS, the picture below shows the contrast curve of the red rice note2 in horizontal and vertical angles. The contrast ratio is greater than 10 at the left and right angles of 85 degrees, so the screen angle of the red rice note can be It can reach 170 degrees or above, that is to say, the screen can still see the contents of the screen at an angle of 85 degrees left and right.
After taking the full-surface brightness of the screen with a professional CCD, select the nine points in the plane to analyze the difference in brightness, and use the point with the lowest brightness to be the point with the highest brightness. The obtained value is set to the nine-point uniformity in the plane, the red rice Note2 The nine-point uniformity of the screen is 88%, and the nine-point uniformity of Redmi Note1 is 87%. The performance is very good.
Summarizing the various comparative analysis we have done, the quality of Xiaomi products on the screen is still relatively good. Especially with such a high specification of material configuration, rice noodles can continue to enjoy the benefits of high cost performance.
In fact, all brands can adhere to quality, strict quality control, and strong partners with the supply chain partners. However, the current industry is fiercely competitive, and both the brand and the supply chain are facing a severe test. Nowadays, so many excellent companies are laying off a large number of employees, but they have already felt the chill in the winter, and it is the most important thing to survive this winter. All of you who are fighting in the front line of the industry chain must insist on quality!
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