Low Temperature Poly-silicon (LTPS) was originally developed by Japanese and American technology companies in order to reduce the energy consumption of Note-PC displays, making Note-PC appear thinner and lighter, and developed in the mid-nineties. The technology began to move toward the trial phase. The new generation of organic light-emitting panel OLEDs derived from LTPS was officially put into practical use in 1998. Its biggest advantage is its ultra-thin, light weight and low power consumption, which can provide more vivid colors and clearer images.
characteristic
LTPS-TFT LCD has the advantages of high resolution, fast response speed, high brightness, high aperture ratio, etc., and because the silicon crystal arrangement of LTPS-TFT LCD is more order than a-Si, the electron mobility is relatively 100 times higher. The peripheral driving circuit can be fabricated on the glass substrate at the same time to achieve the goal of system integration, space saving and cost of driving the IC.
At the same time, since the driver IC circuit is directly fabricated on the panel, the external contact of the component can be reduced, the reliability is improved, the maintenance is simpler, the assembly process time is shortened, and the EMI characteristic is reduced, thereby reducing the application system design time and expanding the design freedom.
The highest technology of LTPS-TFT LCD is System on Panel. The first generation LTPS-TFT LCD achieves high resolution and high brightness with built-in driver circuit and high performance pixel transistor, which has made LTPS-TFT LCD and a-Si Make a big difference.
The second-generation LTPS-TFT LCD has advanced through the circuit technology, and the analog interface enters the digital interface to reduce power consumption. The LTPS-TFT LCD carrier mobility of this generation is 100 times that of a-Si TFT, and the electrode pattern line width is about 4 μm. The LTPS-TFT LCD characteristics have not been fully utilized.
The third-generation LTPS-TFT LCD is more complete than the second generation in the peripheral large-scale integrated circuit (LSI) integration. Its purpose is: (1) no peripheral parts can make the module thinner and lighter, and can also reduce the number of parts and assembly man-hours; 2) Simplified signal processing can reduce power consumption; (3) Equipped with memory to minimize power consumption.
Due to the high resolution, high color saturation, and low cost of the LTPS-TFT LCD liquid crystal display, it is expected to become a new wave of displays. With its high circuit integration characteristics and low cost advantages, it has an absolute advantage in the application of small and medium size display panels.
However, there are two problems with p-Si TFTs. One is that the off-state current (ie, leakage current) of the TFT is large (Ioff=nuVdW/L); the second is that it is difficult to prepare a high-mobility p-Si material at a low temperature and large area. There are certain difficulties.
It is a new generation of technology products derived from TFT LCD. The LTPS screen is manufactured by adding a laser processing process to a conventional amorphous silicon (a-Si) TFT-LCD panel. The number of components can be reduced by 40%, and the connection portion can be reduced by 95%, greatly reducing product failure. The chance. This screen has been greatly improved in terms of power consumption and durability, with horizontal and vertical viewing angles of up to 170 degrees, display response time of 12ms, display brightness of 500 nits, and contrast ratio of 500:1.
There are three main ways to integrate low temperature p-Si drivers:
The first is the hybrid integration of the scan and the data switch, that is, the row circuit is integrated, the switch and the shift register are integrated in the column circuit, and the multi-way address driver and the amplifier are externally connected to the flat panel display by the inheritance circuit;
Second, all drive circuits are fully integrated on the display;
Third, the drive and control circuits are integrated on the display.
IPS screenThe IPS screen is a TFT-based technology, and its essence is still a TFT screen. IPS screen (In-Plane Switching) technology is a liquid crystal panel technology introduced by Hitachi in 2001, commonly known as "Super TFT". However, there are not many models that can be seen in the market.
Characteristics
The biggest feature of the IPS panel is that its two poles are on the same surface, unlike the other liquid crystal mode electrodes are arranged on the upper and lower sides. This technology optimizes the arrangement of liquid crystal molecules and adopts a horizontal arrangement. When the external pressure is encountered, the molecular structure is slightly depressed downward, but the overall molecules are also horizontal. When encountering external forces, the hard-wired liquid crystal molecular structure is much more robust and stable than the soft screen! Therefore, the image distortion and the color of the screen are not generated, and the screen effect can be protected to the utmost extent without being damaged. There is also an S-IPS panel that is an improved version of IPS.
Due to the excellent performance of IPS technology, many manufacturers have begun to use hard screens extensively, and vigorously promote IPS hard screen technology to provide consumers with higher definition and performance of LCD TVs. Hard-screen LCD TVs have become mainstream products in the color TV industry.
In fact, in the fields of high-tech fields such as aerospace, medical, design, and communication, many experts also use hard-screen LCDs.
Professionals use IPS hard screens, mainly in the advantages of IPS hard screen in terms of dynamic resolution, accurate color reproduction, and viewing angle. First of all, compared with the traditional liquid crystal, the IPS hard screen has a stable liquid crystal molecular arrangement structure, and the response speed is faster, so that it has superior expressiveness in dynamic definition. The hard screen also completely eliminates the blurring and water-grain diffusion phenomenon of the traditional liquid crystal display when it is subjected to external pressure and shaking, and the image sticking and smearing are eliminated when playing the extreme speed picture. Therefore, the moment is in the state of motion. The aerospace, automotive, and subway industries have adopted IPS hard screens to achieve image quality without loss. It is reported that the newly opened Beijing Metro Line 5 and bus car TVs have adopted IPS hard-screen LCD.
In fact, not only in the professional field, but also in the field of home appliances closely related to consumer life, IPS hard-screen LCD is widely used due to its unique advantages.
We know that buying LCD TVs requires buying HD. But the vast majority of HDTVs promoted in the market refer to the clarity of still pictures. And when we watch TV and play games, most of the time we watch dynamic pictures. However, some previous LCD TVs have been flawed in displaying dynamic picture effects, and residual images and smear may occur. This has also been criticized by consumers. Therefore, to satisfy the consumers, the response time of the LCD TV is required to be short, and the smear and afterimage of the dynamic display are effectively controlled.
In daily work, game entertainment, IPS display has also become popular, IPS display color performance is linearly improved, while color temperature and white balance color intelligence can be corrected to the most accurate color performance, to maximize the true color in the picture . Allows users to view clear and beautiful images and natural rich color effects at any angle under the FHD resolution provided by IPS hard screen, and fully display professional image quality.
The difference between LTPS and IPS screen:1. LTPS and IPS refer not to one aspect of the screen. LTPS refers to a process of liquid crystal panel, which is a production technology; and IPS is an imaging technology applied to a panel, which is a display technology.
2. IPS (In-Plane Switching) technology is the most advanced LCD panel technology in the world. IPS is a film with a layer of resin attached to it, just like a person wearing glasses. Compared with other panel technologies, the IPS screen is special in that the liquid crystal molecules are not oriented in a transparent mode, but are oriented in an opaque mode. The amount of light transmission is determined by electrodes perpendicular to the orientation direction of the liquid crystal molecules. The higher the number of twisted molecules, the more precise control of the light. It only controls one deflection angle of the IPS liquid crystal panel, and the number of deflection molecules can be approximately proportional to the voltage, making the layer level control of the panel easier to implement.
The reason why the IPS screen has a clear and ultra-stable dynamic display effect depends on its innovative horizontal conversion molecular arrangement, which changes the vertical molecular arrangement of the VA screen, and thus has a more stable and stable liquid crystal structure.
3, LTPS low-temperature polysilicon technology, its biggest advantage is ultra-thin, light weight, low power consumption, and its own light-emitting features, thus providing more brilliant colors and clearer images.
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