Ki-Duck Cho

High-speed driving method using bipolar scan waveform in AC plasma display panel

This paper proposes a new high-speed driving method using the bipolar scan waveform with a scan width of 1 /spl mu/s in an ac-plasma display panel. The bipolar scan waveform in an address period consists of a two-step pulse with two different polarities, i.e., a forward scan pulse with a negative polarity and reverse scan pulse with a positive polarity, which can produce two address discharges, including a primary address discharge for generating wall charges and secondary address discharge for accumulating wall charges. To produce the fast address discharge stably using the bipolar scan pulse during an address period, a new reset waveform is designed based on a V/sub t/ close curve analysis, and the address discharge characteristics examined under various reset and address waveforms. As a result of adopting the proposed driving method, a high-speed address with a scan width of 1 /spl mu/s is successfully obtained when using a checkered pattern on a 4-in test panel.

New driving method and circuits for low cost AC plasma display panel

A new driving method and circuit layout is proposed to reduce the cost of a plasma display panel (PDP). The proposed driving method, which uses only two electrodes in a three-electrode type AC-PDP, can reduce the cost of the driving circuits by 25%, thereby achieving a low cost AC-PDP.

Improvement of color temperature using independent control of red, green, blue luminance in AC plasma display panel

This paper presents a new driving scheme for the improvement and flexibility of a color temperature without sacrificing a peak white luminance using an independent control of the red (R), green (G), and blue (B) luminance in an alternating current plasma display panel (AC-PDP). The independent control for the R, G, and B emissions can be achieved by selective application of the various narrow auxiliary pulses to the R, G, and B address electrodes during a sustain-period. The auxiliary pulses can control the luminance levels independently from the R, G, and B cells by forming the fast and efficient plasma or by slight disturbing of the wall charge accumulation. By the application of various auxiliary pulses leading to the simultaneous control of each colors luminance, it is observed that the new driving scheme can improve the color temperature from 5396 K to 10 980 K in a 4-in test panel with almost the same peak white luminance as that of the conventional driving scheme.

Improvement in the luminous efficiency using ramped-square sustain waveform in an AC surface-discharge plasma display panel

This paper proposes a new sustain waveform to improve the luminous efficiency of an AC plasma display panel (AC-PDP). The new sustain waveform is a superimposed waveform, which adds a ramp-waveform to a square-waveform, and has an increasing voltage slope between the rising and falling edge. This waveform can induce a longer-sustained discharge at the rising edge plus a self-erasing discharge at the falling edge, thereby improving the luminous efficiency, When compared with the conventional square sustain waveform, the proposed sustain waveform with a 9.3 V//spl mu/s voltage slope achieved a 65% higher luminous efficiency in a 4-in AC-PDP test panel even at a low frequency (62 kHz).

Improvement of low gray scale linearity using multi-luminance-level subfield method in plasma display panel

A new multi-luminance-level subfield method is proposed to improve the low gray-level color reproducibility of a plasma display panel. Multi-luminance levels can be expressed per sustain pulse in low gray scale by applying the different auxiliary pulses in the same sustain-pulse subfields, thereby suppressing the low gray-level contour.

Color reproduction error correction for color temperature conversion in PDP-TV

It is often desirable that manufacturers and users can convert the reference white of display into the preferred color temperature that is one of representative color characteristics of a light source. An efficient method of correcting color reproduction error is proposed for displaying the NTSC-based video signal in plasma display panel televisions (PDP-TVs) and is also shown to be successfully coupled with flexible color temperature conversion based on the signal processing technique. As a result, this method can contribute to providing a range of user-preferred color temperature in PDP-TVs.

New driving scheme for improving color temperature of plasma display panel-HDTV

This paper presents a new driving scheme for improving the color temperature of plasma display panel-televisions (PDP-TVs). Auxiliary address pulses, plus sustain pulses applied to sustain electrodes, are applied only to address electrodes with blue phosphor layers during a sustain-period, thereby resulting in increasing the luminance of blue cells among the red, green, and blue cells. When compared with the conventional driving scheme, the proposed driving scheme can improve the color temperature of PDP-TVs without reducing the luminance.

New color-enhancing discharge mode using self-erasing discharge in AC plasma display panel

A new color-enhancing discharge mode using a self-erasing discharge is proposed based on an analysis of the Ne emission mechanism in a Ne-Xe gas mixture. The effects of the new color-enhancing discharge mode produced by a ramped-square sustain waveform on improving the color reproducibility are examined in an alternate current plasma display panel (ac-PDP) filled with a Ne-Xe gas mixture. When the ramped-square sustain pulses are applied at 150 kHz, the color purities of the blue and green visible emissions are both improved, thereby expanding the color gamut area by about 5.4% without reducing the luminance.

P‐64: Improvement of Color Temperature Using Address Voltage Pulse During Sustain Period of AC‐PDP

A new driving technique of applying the auxiliary pulses to only the address electrodes with the blue phosphor layers during sustain-period is proposed to improve the color temperature of an AC-PDP. This auxiliary pulses can increase the intensity of blue light, such that the color temperature of an AC-PDP can be improved without any modification of cell structure and degradation of image quality.

Improvement of color temperature using auxiliary address pulse driving scheme in 42‐in. WVGA plasma display panel

Abstract Auxiliary address pulse driving scheme is proposed for controlling and improving the color temperature of the 42‐inch WVGA ac‐plasma display panel (ac‐PDP) without sacrificing total luminance. Under a white‐background, the color temperature of 42‐inch ac‐PDP is improved by about 1,700 K, whereas under a black‐background, the color temperature of 42‐inch ac‐PDP is improved by about 3,200 K. In addition, by properly controlling the luminance in the R, G, and B cells, the color temperature of 42‐inch ac‐PDP can be raised from 5,827K to 10,705K.