Scan-type display device control circuit

摘要

A scan-type display device control circuit is suitable for receiving successive frame data and driving a light-emitting diode (LED) display device accordingly. The scan-type display device control circuit includes a ping-pong buffer, a data storage controller, a line scan controller, a display buffer, and a scrambled pulse width modulation (PMW) signal generating device. The scan-type display device control circuit can utilize frame data circularly and repeatedly, so as to prevent a great mass of data from being transmitted repeatedly. Therefore, a band width for inputting data can be reduced significantly. Furthermore, the scrambled PMW signal generating device can scramble a PMW signal with a long period into a plurality of scrambled PMW signals with a short period. Therefore, the refresh rate can be efficiently enhanced without changing the band width for inputting data.

主权项

1. A scan-type display device control circuit, suitable for receiving a plurality of successive frame data and driving a light-emitting diode (LED) display device accordingly, comprising:
a ping-pong buffer, comprising a first storage area and a second storage area; a data storage controller, for receiving the frame data in sequence and storing the frame data in the first storage area or the second storage area alternately; a line scan controller, logically connected to the ping-pong buffer, for capturing a plurality of line data of the frame data from the first storage area or the second storage area alternately; a display buffer, logically connected to the line scan controller, for temporarily storing the line data; and a scrambled pulse width modulation (PWM) signal generating device, logically connected to the display buffer or the line scan controller, wherein the scrambled PWM signal generating device captures the line data and generates a scrambled PWM signal according to the line data; wherein for each frame,
a displaying period is divided into a first number of sub-periods, each sub-period is divided into a second number of scan line changing periods, the frame data is divided into the second number of line data, and each line data is scrambled by the scrambled PWM signal generating device into the first number of sub-line data, such that each sub-line data corresponds to one scan line changing period;in each sub-period, the corresponding sub-line data of each of the second number of line data is sequentially transmitted for displaying an image of the frame, such that each frame is displayed the first number of times in the displaying period; andthe line data is M bits, the scan line changing period is 2N cycles plus a deadtime period, and N is smaller than M.