Put aside the low PPI camera panel under the screen that Samsung's Z Fold 3 has a distinct sense of separation, in addition to the ZTE AXON 20 Extreme Edition, which has been delisted, there are now mobile phones on the domestic market that can buy the off-screen camera panel, ZTE's AXON 30 to the best version, Xiaomi MIX 4, and the red magic 7 Pro that was just released.
▲ Red Devils 7 and Red Devils 7 Pro, the newly released Red Devils 7 Pro is different from the previous two models, it is the first model in the field of gaming / e-sports mobile phones equipped with an off-screen camera. And a mobile phone that locates the game esports, why do you want to do an off-screen camera? What is so special and advanced about its off-screen camera solution? What are the drawbacks?
▲ Xiaomi Mi MIX 4 main (upper right), secondary (bottom left) screen area junction sub-pixel arrangement micro-real shot
▲ ZTE AXON 30 main (left), sub -right) screen area junction sub-pixel arrangement micro-real shot Xiaomi's MIX 4 screen camera panel is from Huaxing Optoelectronics, using a "pearl arrangement" close to the Samsung diamond arrangement; while ZTE's AXON 30 to the best version is from Visionox, using a delta arrangement; this time the Red Devil 7 Pro Panel, although also from Visionox, but its sub-pixels are Visionox's latest "Ding arrangement".
▲ Red Devil 7 Pro main (right), sub -) (left) screen area junction sub-pixel arrangement micro-real shot The so-called "Ding-shaped arrangement", compared with the diamond arrangement and zhou dongyu arrangement (Delta arrangement), only look at the arrangement of this sub-pixel, the matrix structure seems to be more complicated, and it is not easy to find the law at first glance - according to Visionox, the so-called "Ding-type arrangement" sub-pixel combination is isosceles trapezoidal, which is similar to the side view of the mainland Bronze Age "Ding", hence the name.
Therefore, whether it is the main screen area of the Red Devil 7 Pro OLED panel or the camera secondary screen area, a group of sub-pixel matrices are arranged in an isosceles trapezoidal arrangement, which belongs to the "ding-type arrangement", and the advantage of this arrangement is that the display is more uniform, clear, and the degree of customization is large.
First of all, we know that the color display panel including OLED, a pixel is generally composed of R, G, B / red, green, blue subpixels, but because the different subpixels of OLED have different luminous lifespans, there is a common subpixel situation, and the size and form of each type of subpixel are not necessarily the same - especially the blue B subpixel life is the shortest, in order to match the life of the entire panel, generally a single B subpixel will be relatively large, but the larger the area of the subpixel, the more "encroaching" on the space of the driving circuit, There are high requirements for the process. In a patent published by "Kunshan Guoxian Optoelectronics" behind Visionox, it points out the "Ding-type arrangement" of the Ding-type road and its advantages. In its OLED pixels, the first, second, and third subpixels are arranged in the form of a matrix, the B subpixel is its third subpixel, the first and second subpixels can be R subpixels or G subpixels, and any second subpixel will be surrounded by two first subpixels and two third subpixels, and the center of the second and third subpixel emitting regions is connected, which can form an isoscelesial trapezoid that surrounds the second pixel.
This approach geometrically reduces the distance from the first subpixel luminous region (Fig. 120) to the corresponding via (Fig. 150), while increasing the distance between the third subpixel, the B subpixel (Fig. 130) and the corresponding via, so that they obtain an equal distance from the "second subpixel (Fig. 110) and the corresponding via" - and the anode of each subpixel needs to be driven by the corresponding via in the flat layer connected to the thin film transistor, so that the design purpose is to ensure the size of the B subpixel and improve the production yield On the other hand, it also increases the margin of the process, providing more space for the design of the off-screen camera - this is the premise of the Red Devil 7 Pro's off-screen camera panel implementation.
The Red Magic 7 Pro is a Ding-type arrangement in both the main screen area of the non-off-screen camera and the sub-screen area where the camera is located; with the help of the high customization attributes of the Ding-shaped arrangement, Red Magic and Visionox have cooperated to develop a "multi-drive ACE circuit", which optimizes the circuit density close to the camera area, increases the transmittance of the camera area under the UDC screen, and uses the direction scheme of the wavy electrode to reduce the diffraction phenomenon generated when light passes through the panel and improve the clarity of the front camera The Red Devils officially said that the pixel structure of the Ding-type arrangement can also increase the re-re-penetration rate by nearly 20%. On the hardware, the UDC Pro screen display chip is used to narrow the color gap in the main screen and the second screen area, and reduce the sense of separation of the dual screen.
Of course, this piece of off-screen camera panel from Visionox, the responsibility is to improve the display effect as much as possible, improve the permeability of the front camera, but due to the limitations of objective physical laws, the Red Devil 7 Pro will also have the shortcomings of other under-screen camera panels, such as the flooding phenomenon of backlit selfies is more obvious, and the details of the secondary screen area under the complex screen are not as good as the main screen area. However, the e-sports positioning of the Red Devil 7 Pro, its audience's use of the front camera is relatively low, so that the shortcomings of the front camera imaging are further weakened, but a full screen plays a greater role in the presentation of the game screen - perhaps the combination with the e-sports mobile phone is one of the correct directions for today's off-screen camera solution.
(Part of the source: Red Devils, Visionox, National Patent No. 201610864401.0)