Here is a step-by-step way to explain the display principle of PDP. I believe everyone has seen thunder? Lightning falls directly from the clouds to the ground. The path that passes through is air. To make the air that is not suitable for conduction become the conductor path through which the current flows, naturally there is a high voltage as the gravitational force. This is called arc discharge.
There are many applications in daily life that are arc discharge applications, such as electric shock sticks for self-defense, and fluorescent tubes (also called fluorescent lamps) for lighting. The left and right ends of the tubes are each an electrode, and the tube is filled with mercury vapor ( Or mercury vapor, mercury gas), and coating the fluorescent material on the inner wall of the tube, and then sealing the tube (to prevent leakage of steam). Once the voltage is applied to both ends of the electrode, the mercury vapor in the tube will be forced into two. The conductive body and the conductive path (plasma state) form a miniaturized arc discharge. As a result of the discharge, ultraviolet light (UV) is generated. The ultraviolet light is irradiated to the fluorescent material in the tube wall, and the visible light is visible to the outside of the tube. Illumination light.
In fact, the neon light is the same, except that the visible light that is diverging outward is not white, but different colors. Each light tube emits one color, and different colors use different fluorescent substances.
Understand the principle of fluorescent lamps, you can easily understand the display principle of PDP. PDP is actually to reduce the size of fluorescent tubes, from long tubes to tiny cubic lattices (cells, or discharge chambers), but the way of operation Maintain the same, then apply different colors of phosphor in three adjacent lattices, respectively, to display the three primary colors of red, green and blue, thus forming a basic display pixel Pixel) that can be fully rendered, and then The pixels are amplified in length and width, and the group constitutes 1280&TImes; 720, 1920 & TImes; 1080 and other matrix configurations, thus becoming a PDP display system.
Further, it is not necessary to force the discharge in the PDP to use mercury vapor, and an inert gas mixed by neon (Ne) æ°™ (Xe) or æ°¦ (He) æ°™ (Xe) may also be used.
More simply, the PDP is composed of thousands of tiny neon lights, but its display principle still relies on arc discharge. The discharge must have a higher electrode voltage (like thunder), which is also a PDP power-consuming one. Big main cause.
However, the above is only a metaphor for easy understanding, but more accurate and specific technical details include DC (direct current) discharge or AC (alternating current) discharge. The electrode configuration used in different ways is also different, however due to the DC type. The circuit system design is too complicated. Today's sales volume production PDP is almost AC type, using X, Y, Z three sets of electrodes to control the discharge, X, Y electrodes are responsible for scanning drive, Y, Z electrodes are responsible for addressing drive, The Y electrode has two jobs at the same time.
PDP power management solution
About PDP power management, you can talk about it from two levels:
(1) Power saving: In the face of the challenges of LCD, PDP must make operating power more refined;
(2) Low cost: PDP is still expensive in terms of cost per unit. How to make the overall system further price reduction is also a major issue in the research and development of existing PDP, and the cost of the system is also very important.
First of all, in terms of power saving, the power consumption of the PDP is closely related to the discharge voltage. However, in order to achieve the energy state of the discharge, it is necessary to use a higher voltage, that is, a potential of about 160 V to 180 V or more, and the potential must be periodically Alternate (AC type PDP), that is, the X electrode is 160V and the Y electrode is 0V. At that time, the X electrode is 0V and the Y electrode is 160V.
In order to reduce the power consumption of PDP, Fujitsu-Hitachi (Fujitsu Hitachi, Fujitsu is also the founder of PDP) proposed the technology of TERES (Technology of Reciprocal Sustainer), alternating the potential of X and Y electrodes by "0V: 160V, 160V: 0V. Change to "+80V: -80V, -80V: +80V" mode, and double the alternate frequency to compensate for the change in drive voltage.
In this way, reducing the voltage level to the past half can reduce the power consumption to 1/4 of the past, but doubling the frequency doubles the power consumption, which can still reduce the overall power consumption to the past 1/. 2.
Secondly, the low cost, PDP circuit system cost is higher than LCD, and now LCD has also begun to develop in the high number of fields, forcing PDP to be more active than the past to reduce circuit complexity and cost. And why is the PDP circuit system more expensive? The reasons are as follows:
(1) The discharge requires high potential energy, so it is necessary to use a power MOSFET switch that is more resistant to high voltage, resulting in higher switching components;
(2) A variety of operating voltage levels must be prepared to increase circuit complexity and increase costs;
(3) The internal resistance of the MOSFET switch under high voltage will also increase. In order to improve the driving efficiency and make the discharge more stable, a utility switch is mostly implemented by paralleling several MOSFETs, thus increasing the amount of MOSFET. Increase costs;
(4) High pressure and high flow are accompanied by high heat, so it is necessary to pay more attention to heat dissipation design, so that the cost increases;
(5) Once the high voltage is lost, the damage caused by the circuit system will be large. Therefore, the optocoupler is sometimes used as the isolation switch, so that the damage will not be more diffused, and the safety design also increases the cost.
Regarding all of the above, in fact, most of the TERES technology has been solved. Since the voltage is reduced from 160V to 80V, the withstand voltage requirement of the MOSFET can be reduced. Therefore, a cheaper MOSFET can be selected, and the internal resistance of the switch is reduced after the voltage is lowered. It is no longer necessary to use the design of the parallel switch to improve the driving efficiency, increase the discharge stability, reduce the number of power MOSFETs and reduce the cost. At the same time, because TERES has halved the overall power consumption, the power and cost of the heat dissipation design can be relaxed. .
As for the second item, the voltage level type is too much, the circuit is too complicated, mostly refers to the Y pole circuit of the PDP, and the Y pole plays the two corners in the time division multiplexing mode. At this time, the Y pole must perform the discharge driving together with the X pole. At that time, the Y pole must perform the scan drive together with the Z pole (data refresh and update of the display screen). When discharging, the Y pole needs to use -170V, -70V voltage, and the Y pole needs 0V (ground) during scanning. The voltage of +160V is equal to four voltage levels.
There are too many voltage types used in the Y pole, and the operation circuit is too complicated, which makes the PDP circuit cost high. However, the TERES technology also improves this, and the applied voltage is reduced to three types: +80V, 0V, -80V, scanning. Use 0V, -80V, use 0V, +80V when discharging, plus change the scanning order, which can effectively simplify the overall circuit, reduce the functional modules required for the Y-pole circuit from five to three, and thus reduce cost.
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