Image display method and image display device

An image display device for expressing gray levels by using a Frame Rate Control (FRC) method, comprising:

• a display panel having a plurality of pixels including P (P is a positive integer) sub-pixels;
• a driver for display-driving each of the pixels of the display panel in accordance with P J-bit (J is a positive integer) driving data values corresponding to the P sub-pixels;
• and
• a signal processing circuit for distributing K-bit (K is a positive integer of K>J) input image data to time-shared frame data values including M (M is a positive integer of M<2K−J) frames arranged in time series each of which includes P J-bit data values and supplying the time-shared frame data values to the driver as driving data,
• wherein said signal processing circuit generates 2K−J gray levels insufficient due to a difference between numbers of bits of the K-bit input image data and the J-bit time-shared frame data by using at least some of combinations of said time-shared frame data of (P×M) ways performed for each of the pixels in accordance with the 2K−J gray levels, and
• when a total number of combinations of (P×M) ways of the time-shared frame data to the P sub-pixels is less than 2K−J gray levels, i.e., P×M<2K−J, a shortage is compensated by using at least some of (Q×M) {Q is a positive integer of (Q×M)<2K−J} time-shared frame data values.

An image display method using Frame Rate Control (FRC) method of a display panel having a plurality of pixels, said method comprising:

• supplying K-bit input image data (K is positive integer) for a pixel including P (P is a positive integer) sub-pixels to a signal processing circuit;
• dividing said K-bit input image data into J-bit (J<K) driving image data and (K−J)-bit data;
• forming M time-shared frame data for each of said P sub-pixels so that (P×M) combination data correspond to said (K−J)-bit data;
• and
• driving each of P sub-pixels M dines using based on said (K−J)-bit data to display 2K−J (2K−J<P×M) gray levels for each J-bit driving image data having 2j gray levels so that said pixel including P sub-pixels display 2K gray levels,
• wherein, when a total number of combinations of (P×M) ways of the time-shared frame data to the P sub-pixels is less than 2K−J gray levels, i.e., P×M<2K−J, a shortage is compensated by using at least some of (Q×M) {Q is a positive integer of (Q×M)<2K−J} time-shared frame data values.