Matsushita Electric Industrial Co., Ltd.

Matsushita Electronics Corporation

Takuma Higashi

Akio Niwa

Tomoko Morita

Yukiharu Ito

Takao Wakitani

Yuji Sekiguchi

Yasuaki Muto

Toshio Wakahara

Kumetsugu Yamamoto

Video data of a field necessary for I/P conversion and scanning line conversion is stored in a field memory part (), vertical frequency conversion is performed by a memory control processing part (), I/P conversion is performed by an I/P conversion processing part (), scanning line conversion is performed by a scanning line conversion part () and horizontal pixel conversion is performed by a horizontal pixel conversion processing part () with the data stored in the field memory part, and a synchronous processing part () supplies a prescribed clock, a horizontal synchronizing signal and a vertical synchronizing signal to each block. A single system performs vertical frequency conversion, I/P conversion, scanning line conversion and horizontal pixel conversion.

Video signal conversion device and video signal conversion method

The plasma display panel having brightness display ranges comprising a gradation brightness display range which displays gradation brightness corresponding to the input signals under a preset input signal level and a constant brightness display range which displays a constant peak brightness greater than the maximum brightness corresponding to input signals greater than the preset input signal level. The plasma display panel can provide the gradation display up to the maximum brightness corresponding to the input signals up to the maximum input and provide the constant peak brightness corresponding to the peak level input by adding one additional weighting bit for the higher gradation. Consequently, a high quality brightness display with high mean value of the brightness and sufficiently high peak brightness can be achieved. Furthermore, the plasma display panel enhances the brightness weighting value and the value of .gamma. for the reverse .gamma. correction when the input signals go over the preset value and decrease the values to the original values when the input signals drop below the preset value. The plasma display panel can provide the gradation display up to the maximum brightness corresponding to the input signals up to the maximum input signal and provide the gradation display up to the peak brightness greater than the maximum brightness corresponding to the input signals over the maximum input signal. Consequently, high quality display with high brightness and high contrast without exceeding the maximum permissible power consumption can be achieved.

Plasma display panel and method of controlling brightness of the same

Growing community of inventors

Osaka, Japan

Takuma Higashi