PDP display power management architecture analysis

Plasma display in a large flat panel display, although the yield, the Visual angle, and other advantages, so it appears to rely on the principle, as the discharge arc discharge must have higher electrode voltage, plasma display compared to the other monitor more power.

This article describes plasma monitor power consumption of the main and two large dimension describes the power of plasma monitor management programmes.

PDP display principle, why the higher power consumption PDP?

In this step by step way to illustrate the principle that the PDP display members are seen thunder? lightning directly from the cloud to the ground, the path is in the air, to let the original is not suitable for conducting air become current flowing through the conductor path, naturally high voltage as gravity, this is the so-called arc discharge.

In daily life there are many applications which arc discharge applications such as electric shocks with defensive, and of great use for the fluorescent tube lighting (also known as fluorescent lights), the left and right side of the tubes is one of the electrodes, the tube into the mercury vapor (or mercury vapour, mercury gas), and in the Conference halls and fluorescent lamp wall coating substances, tube seal (in case of steam leaking outside), once the electrode voltage, on both ends of the flux will force the tubes of mercury vapour into the ends of the conductors, conductive path (plasma), forming the miniaturization of arc discharge results produces ultraviolet (UV), UV-irradiation to the fluorescent tube wall material, will be presented to the outside of the visible light.

In fact the practice of the neon lights are the same, just the visible light that emanates not white, but a variety of different colors, each light emits a color, use different colors to different fluorescent substances.

Understanding the truth after the fluorescent lamp can easily understand the PDP display principle, PDP is actually the size of the fluorescent tube, from long tube into very tiny cubic lattice (Cell, or discharge room), but the mode of operation remains unchanged, and then in three adjacent to the Lattice within Conference of different colors of fluorescent materials, respectively may show red-green-blue color of the form, so a full color rendering of basic display pixel (Pixel), then the pixel aspect of amplification, the group constitutes a 1280 × 720, 1920 × 1080 matrix configuration, so they become a PDP display system.

In addition, in the discharge of PDP in force not required to use mercury vapour, you can also use the neon (Ne) Xenon (Xe) mixed or helium (He) Xenon (Xe) mixed with an inert gas.

More simply put, the PDP shall be composed of thousands of tiny neon light, so it shows the principle continues to be dependent on ARC discharge must have high voltage electrode (like thunder), this is also a power consumption of the PDP, a big reason.

However, the only comprehensible analogy, but more accurate, specific technical details also include DC (DC)-type discharge or AC (AC) type, the different ways used by the electrode configuration differently, however due to the DC-circuit system design is too complicated, almost all sales liangchanxing PDP take line AC type, use the X, Y, Z three electrodes to manipulate discharge electrode, X, Y, and Y is the responsibility of the scan driver, Z electrode is responsible for addressing driver, where y two electrode at the shoulder.

　　

PDP power management programme

Power management on PDP, may be two aspects to talk about:

(1) electricity: facing the challenges of the LCD, PDP must allow the operation of the provincial electricity more;

(2) low cost: the cost per inch PDP is still relatively expensive, how to make the whole system further price reductions are existing research and development of a large PDP project, which cost the provincial system circuit is also very impressive.

First provincial electric power consumption of the PDP and discharge voltage are closely related, yet to be able to discharge of energy State are bound to use a higher voltage, i.e. about 160V ~ 180V above potential, but also to let cycle potential alternating (AC-PDP), that is, at this point X, Y electrode as 160V electrode to 0V, that was then turned into X electrode to 0V, Y electrode as 160V.

In order to reduce the power consumption of the PDP, Fujitsu-Hitachi (Fujitsu, Hitachi, Fujitsu was the incidence entrepreneurship PDP) presented the TERES (Technology of Reciprocal Sustainer) technology, X, Y electrode potentials alternately by 「introduction 0V: 160V, 160V: 0V 」 into 「introduction + 80V:-80V,-80V: + 80V 」 manner, while at the same time to make up for the driving voltage changes will double alternating frequency.

So, the voltage to minimize potential bit past half enables lower power consumption drops to 1/4 of the past, but the frequency-doubled and doubled power consumption, so still allows the overall power consumption drops to 1/2 of the past.

Second, low-cost circuit system of PDP is higher than LCD, LCD also began to develop a high number of fields, or force the PDP shall be more active than in the past to reduce complexity and cost of circuit.

But why PDP's circuit system is less expensive? reasons include the following:

(1) discharge needs high level can also be used more resistant high-voltage power MOSFET switch type, causing the switching elements more expensive;

(2) shall be prepared for a variety of operating voltage potential bit so that the circuit complexity, thereby increasing the costs;

(3) MOSFET switch in the on-resistance at high pressure will also increase, in order to drive efficiency and discharge more stability, therefore a utility switch mostly carried out by several MOSFET, parallel to achieve so you increase the dosage, the MOSFET increased costs;

(4) high pressure, high flow is consequential to the hyperpyrexia, hence the need for more sophisticated thermal design, increased costs;

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(5) high pressure once a slip, caused by circuit system damage will be larger, sometimes using optical coupler as isolation switch, so that harm would not have greater diffusion, this security design to increase costs.

On these, in fact, most TERES technologies also resolved, because the voltage from 160V down to MOSFET 80V, so the voltage requirements can be reduced, so you can choose low voltage MOSFET, lower internal resistance of the switch, it will no longer need to use parallel switch designed to enhance driver efficiency, stability, reduce the discharge of power MOSFET's number can reduce costs, while at the same time as the overall TERES has halved power consumption, making the effort, thermal design cost to relax.

As regards the second item, the voltage must type too much, too complex, multi circuit is PDP's Y-pole circuit, Y pole to timesharing multiplex mode played two horns, Y pole to perform together with X-pole, discharge driving extremely well at Y and Z are performed with the scan driver (the display of data refresh, update) when the discharge must use the-Y 170V,-70V two voltages, while scanning Y pole you need 0V (earthed), voltage of + 160V, equal to need access to four voltage.

Great use of Y voltage type too much on the operation of the circuit, so that excessive complexity PDP circuit costs remain high, so TERES technology to improve the application of voltage will be reduced to three: + 80V, 0V,-80V, scan using 0V,-for use when discharge 80V, 0V, + 80V, plus scanning order changes, so you can effectively simplify the overall circuit, Y-pole circuit required function module from five to three, thereby reducing costs.

　　

Conclusions and recommendations

Finally, you must understand: PDP's overall system circuit, including the display driver, display control, power management, protection circuit, at this stage are highly original PDP manufacturing factory, even if there are dependent of PDP driver, control of wafer, also is a former factory, and match the factory's own design and use, in addition to the original factory outside of PDP circuit design to highly dependent on their own customized design effort, it is difficult to find can rely on the application of the chip.

However, the overall circuit PDP is still some parts can directly follow the more flexible configurable, programmable-chip, you can use the power part flexibility-set configuration of power management chip, as a response to a variety of PDP is required, such as voltage potential Potentia Semiconductor wafer of PS-2406 (with power supply, to adjust, manage, protect, such as multiple utility) can be used for PDP power circuit design.

And if the CPLD, FPGA Xilinx may also apply the logic of the PDP circuit design.

In addition to these, the PDP system driver circuit, scan circuit, discharge circuits, or to rely on the large proportion of custom design and need based panel specifications, features, performance and design.

　　

　　

　　

Figure a Fairchild (shortcut semiconductor) in PDP circuit system can provide component diagram (dark areas).

　　

　　

　　

Figure 2 PDP display circuit diagram (section structure of viewing angle).

Chen Yin Zhi-finishing

　　

　　

　　

Figure 3 PDP system circuit main function block diagram.

Chen Yin Zhi-finishing

　　

　　

　　

Figure 4 Fujitsu Hitachi introduced the so-called TERES technology to allow PDP power reduced by half, circuit costs halved, schematic diagram for TERES technology.