In order to achieve the uniform display effect of O LED and solve the cross effect, the structural characteristics of OLED and the driving characteristics of passive OLED device are analyzed firstly, and the passive driving technology of OLED is introduced. Secondly, in order to achieve a uniform display, current source driving and pre-charging techniques are employed to increase the uniformity of the brightness present. Finally, based on the analysis of the cause of the cross-effect formation, the reverse voltage suppression method is adopted to make the unselected pixels in the off state under the action of the reverse voltage, thus effectively solving the influence of the cross-effect phenomenon on the display.
At present, in the flat panel display technology, an organic light emitting diode (OLED) has the advantages of self-luminescence, high contrast, high reaction speed, wide viewing angle, etc., and has attracted worldwide attention in recent years. Flat panel display technology plays an increasingly important role. As a new generation of display devices, OLEDs have broad development space and application prospects in digital products such as head-mounted displays, MP3s, TVs, mobile phones, and military fields.
The drive control circuit is an indispensable part of the active light-emitting diode, and its performance is directly related to the performance of the whole system. Therefore, the design of high-performance drive control circuits plays an important role in OLED display design. The driving methods of OLED mainly include Passive Matrix Driving and Active Matrix Driving.
A passively driven OLED is called a PM-OLED, and an active driven OLED is called an AM-OLED. The AM-OLED has the characteristics of complicated fabrication, multi-pixel, large size, high cost, and the PM-OLED has simple fabrication. With fewer pixels, smaller size, and lower cost, it mainly introduces the passive driving method of OLED.
The structure of OLED and the principle of illumination
The basic structure of the OLED is composed of a thin and transparent indium tin oxide (ITO), which is connected to the positive electrode, and another metal cathode, which is wrapped into a sandwich structure. This is followed by a hole injection layer, a composite light-emitting layer, an electron transport layer, and a metal cathode. As shown in Figure 1.
The principle of illumination is: when the applied voltage reaches an appropriate value, the holes (holes) and cathode electrons of the positive electrode are injected by the anode and the cathode respectively in the form of electric current and are moved in the opposite direction by the electric field to reach the luminescent layer. In the process of bonding, electrons emit energy in the form of photons to produce luminescence.
Electro-optic characteristics of OLED
The relationship between current density and voltage of OLED and the relationship between brightness and voltage is shown in Fig. 2.
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