Drive circuit and method for screen horizontal scroll and an electronic device using the same
OwnerTian-Hau Chen, Chih-Heng Chu +1inventors
InventorsTian-Hau Chen, Chih-Heng Chu, Zc-Chen Chen
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Abstract
A drive circuit and method for screen horizontal scroll and an electronic device using the same are provided. Channel data is shifted between channels, such that the distance and the rate required for the screen horizontal scroll are achieved. The scrolled (shifted) channel data will be written back into a memory inside the electronic device to update the memory. The memory sends out the updated channel data, without re-calculating the channel data by a microprocessor. With channel data shifted and written back into the memory, the screen image shown in the electronic device is horizontally scrolled.
Claims16
A drive circuit adapted for use in an electronic device, wherein the electronic device comprises a memory, a buffer memory and a display device, the buffer memory receives data from the memory as buffer data corresponding to a plurality of channels, and the drive circuit performs a screen horizontal scroll function to the display device, the drive circuit comprising:
- a control unit, for sending out a write back signal and a select signal, the write back signal being actuated when the screen horizontal scroll function is active;
- a data switching block, for receiving the buffer data, wherein when the screen horizontal scroll function is inactive, the data switching block bypasses the buffer data and when the screen is to be horizontally scrolled, the data switching block shifts the buffer data for outputting according to the select signal;
- a source driver, for receiving the bypassed or shifted buffer data, so as to drive the display device;
- and
- a data write back unit, for writing the shifted buffer data back into the memory according to the write back signal.
An electronic device with a screen horizontal scroll function, comprising:
- a microprocessor for calculating and sending out channel data;
- a memory coupled to the microprocessor, for receiving and outputting the channel data output by the microprocessor;
- a buffer memory coupled to the memory, for receiving and outputting the channel data output by the memory as buffer data;
- a drive circuit coupled to the buffer memory, for generating a write back signal and a select signal, wherein when the screen horizontal scroll function is active, the drive circuit shifts and then outputs the buffer data according to the select signal, and then writes the shifted buffer data back into the memory;
- and when the screen horizontal scroll function is inactive, the drive circuit bypasses the buffer data;
- and
- a display device, coupled to the drive circuit and driven according to the shifted buffer data or the buffer data.
A method for screen horizontal scroll adapted for use in an electronic device having a display device and a memory, comprising the steps of:
- receiving buffer data from the memory;
- shifting the buffer data and writing the shifted buffer data back into the memory when the screen horizontal scroll is active;
- bypassing the buffer data when the screen horizontal scroll is inactive;
- and
- driving the display device according to the shifted buffer data or the bypassed buffer data.
A method for screen horizontal scroll adapted for use in a display device, comprising steps of:
- receiving a frame signal;
- horizontally scrolling the frame signal according to a select signal, so as to generate a scrolled frame signal;
- storing the scrolled frame signal;
- and
- displaying the frame according to the scrolled frame signal.
Dependencies are inferred from the claim text.