Signal processing device, signal processing method, and display apparatus

A signal processing method of supplying a drive voltage signal to a display panel, the display panel including two substrates which oppose each other, electrodes disposed on the respective two substrates, and a plurality of display elements arranged along a scanning line and driven by the drive voltage signal supplied to the electrodes, at least one of the two substrates being transparent, the method comprising the steps of:

• inputting the drive voltage signal by input means;
• detecting, from a drive voltage signal to be supplied to a display element inputted by the inputting step, a luminance level of the pixel displayed by the display element;
• selecting a first correction factor and a second correction factor in accordance with the luminance level of a pixel detected by the luminance level detecting step, from a memory storing a first correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to a first adjacent display element adjacent to the display element in the forward direction of the scanning line, and a second correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a second adjacent display element adjacent to the display element in the reverse direction of the scanning line;
• computing, from a drive voltage signal inputted by the input means, a first voltage level difference indicating a voltage level difference between a drive voltage signal to be supplied to the display element and a drive voltage signal supplied to the first adjacent display element, and a second voltage level difference indicating a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to the second adjacent display element;
• computing a first correction voltage level from the first correction factor selected by the selecting step and the first voltage level difference computed by the differential computing step, and a second correction voltage level from the second correction factor selected by the select step and the second voltage level difference computed by the differential computing step;
• and
• adding the first correction voltage level and the second correction voltage level computed by the correction voltage level computing step, to the voltage level of a drive voltage signal supplied to the display element inputted by the input means, and supplying the resulting level to the display element of the display panel.

A display apparatus comprising:

• a display panel including two substrates which oppose each other, at least one of the two substrate being transparent;
• electrodes disposed on the respective two substrates;
• a plurality of display elements arranged along a scanning line and driven by a drive voltage applied to the electrodes;
• and
• a signal processing device to supply the drive voltage signal to the display panel,
• wherein the signal processing device includes:
• input means for inputting the drive voltage signal;
• luminance detecting means for detecting, from a drive voltage signal supplied to a display element inputted by the input means, a luminance level of a pixel displayed by the display element;
• means for storing a first correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to a first adjacent display element adjacent to the display element in the forward direction of the scanning line, and a second correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a second adjacent display element adjacent to the display element in the reverse direction of the scanning line;
• selecting means for selecting from the store means a first correction factor and a second correction factor in accordance with a luminance level of a pixel detected by the luminance detecting means;
• differential computing means for computing, from a drive voltage signal inputted by the input means, a first voltage level difference indicating a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to the first adjacent display element, and a second voltage level difference indicating a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to the second adjacent display element;
• correction voltage level computing means for computing a first correction voltage level from the first correction factor selected by the selecting means and the first voltage level difference computed by the differential computing means, and a second correction voltage level from the second correction factor selected by the selecting means and the second voltage level difference computed by the differential computing means;
• and
• means for adding the first correction voltage level and the second correction voltage level computed by the correction voltage level computing means to the voltage level of a drive voltage signal to be supplied to the display element inputted by the input means, and supplying the resulting level to the display element of the display panel.

A signal processing device for supplying a drive voltage signal to a display panel, the display panel having two substrates which oppose each other, electrodes disposed on the respective two substrates, and a plurality of display elements arranged along a scanning line and driven by the drive voltage signal supplied to the electrodes, at least one of the two substrates being transparent, the signal processing device comprising:

• an input unit to input the drive voltage signal;
• a luminance detector to detect, from a drive voltage signal supplied to a display element inputted by the input unit, a luminance level of a pixel displayed by the display element;
• a memory to store a first correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to a first adjacent display element adjacent to the display element in the forward direction of the scanning line, and a second correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a second adjacent display element adjacent to the display element in the reverse direction of the scanning line;
• a selector to select from the memory a first correction factor and a second correction factor in accordance with a luminance level of a pixel detected by the luminance detector;
• a differential computing unit to compute, from a drive voltage signal inputted by the input unit, a first voltage level difference indicating a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to the first adjacent display element, and a second voltage level difference indicating a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to the second adjacent display element;
• a correction voltage level computing unit to compute a first correction voltage level from the first correction factor selected by the selector and the first voltage level difference computed by the differential computing unit, and a second correction voltage level from the second correction factor selected by the selector and the second voltage level difference computed by the differential computing unit;
• and
• an adder to add the first correction voltage level and the second correction voltage level computed by the correction voltage level computing unit to the voltage level of a drive voltage signal to be supplied to the display element inputted by the input unit, and supplying the resulting level to the display element of the display panel.

A display apparatus comprising:

• a display panel including two substrates which oppose each other, at least one of the two substrates being transparent;
• electrodes disposed on the respective two substrates;
• a plurality of display elements arranged along a scanning line and driven by a drive voltage applied to the electrodes;
• and
• a signal processing device to supply the drive voltage signal to the display panel,
• wherein the signal processing device includes:
• an input unit to input the drive voltage signal;
• a luminance detector to detect, from a drive voltage signal supplied to a display element inputted by the input unit, a luminance level of a pixel displayed by the display element;
• a memory to store a first correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to a first adjacent display element adjacent to the display element in the forward direction of the scanning line, and a second correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a second adjacent display element adjacent to the display element in the reverse direction of the scanning line;
• a selector to select from the memory a first correction factor and a second correction factor in accordance with a luminance level of a pixel detected by the luminance detector;
• a differential computing unit to compute, from a drive voltage signal inputted by the input unit, a first voltage level difference indicating a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to the first adjacent display element, and a second voltage level difference indicating a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to the second adjacent display element;
• a correction voltage level computing unit to compute a first correction voltage level from the first correction factor selected by the selector and the first voltage level difference computed by the differential computing unit, and a second correction voltage level from the second correction factor selected by the selector and the second voltage level difference computed by the differential computing unit;
• and
• an adder to add the first correction voltage level and the second correction voltage level computed by the correction voltage level computing unit to the voltage level of a drive voltage signal to be supplied to the display element inputted by the input unit, and supplying the resulting level to the display element of the display panel.