Switching method and switching device for display channel, display driving device and display device
The present disclosure provides a method and device for switching a display channel, a display driving device and a display device. The method includes: sending a first switching signal to a write controller of a current display channel when a switching instruction for switching from the current display channel to a target display channel is received; acquiring a frame address in which final write operation of data is completed, and taking the frame address as a first address and a next frame address as a second address; sending a second switching signal to a write controller of the target display channel; and sending a third switching signal to a read controller.
1. A method for switching display channels, comprising:
sending a first switching signal to a write controller of a current display channel when a switching instruction for switching from the current display channel to a target display channel is received, so as to control the write controller of the current display channel to stop writing image data to a memory;
acquiring a frame address in which a final write operation of data is completed in the memory, and taking the frame address as a first address and a frame address immediately after the first address as a second address;
sending a second switching signal to a write controller of the target display channel, so as to enable the write controller of the target display channel to, starting from the second address, sequentially write frames of image data of the target display channel into frame addresses of the memory in a predetermined order; and
sending a third switching signal to a read controller, so that the read controller, under the control of a read control signal, reads image data in the first address again immediately after the read controller reads out the image data in the first address, and then sequentially reads the image data in the frame addresses of the memory.
2. The method of claim 1 , wherein the step of sending the first switching signal to the write controller of the current display channel comprises:
synchronizing the switching instruction to a clock domain of a field synchronization signal of the current display channel to generate the first switching signal, and
sending the first switching signal to the write controller of the current display channel.
3. The method of claim 2 , wherein
the first switching signal is a pulse signal,
a pulse width of the first switching signal is smaller than that of the field synchronization signal of the current display channel, and
a falling edge of the first switching signal and a falling edge of the switching instruction occur at the same time.
4. The method of claim 3 , wherein
sending the second switching signal to the write controller of the target display channel comprises:
synchronizing the switching instruction to a clock domain of a field synchronization signal of the target display channel to generate the second switching signal, and
sending the second switching signal to the write controller of the target display channel.
5. The method of claim 4 , wherein
the second switching signal is a pulse signal,
a pulse width of the second switching signal is smaller than that of the field synchronization signal of the target display channel, and
a falling edge of the second switching signal and a falling edge of a pulse, immediately after the switching instruction, of the field synchronization signal of the target display channel occur at the same time.
6. The method of claim 5 , wherein
sending the third switching signal to the read control module comprises:
synchronizing the switching instruction to a current clock domain of the read control signal to generate the third switching signal, and
sending the third switching signal to the read controller.
7. The method of claim 6 , wherein
the third switching signal is a pulse signal,
a pulse width of the third switching signal is smaller than that of the read control signal, and
a falling edge of the third switching signal and a falling edge of a pulse of the read control signal immediately after the switching instruction occur at the same time.
8. The method of claim 7 , wherein
the read control signal, the field synchronization signal of the current display channel, and the field synchronization signal of the target display channel have a same timing,
the read control signal is synchronized with the field synchronization signal of the current display channel, and
the read control signal is not synchronized with the field synchronization signal of the target display channel.
9. A device for switching display channels, comprising:
a processor; and
a storage with computer executable instructions stored therein, wherein when the computer executable instructions are executed, the processor performs the following steps:
receiving a switching instruction for switching from a current display channel to a target display channel,
sending a first switching signal to a write controller of the current display channel when the switching instruction is received, so as to control the write controller of the current display channel to stop writing image data to a memory,
acquiring a frame address in which a final write operation of data is completed, and taking the frame address as a first address and a frame address immediately after the first address as a second address when the first switching signal is received by the write controller of the current display channel,
sending a second switching signal to a write controller of the target display channel to enable the write controller to, starting from the second address, sequentially write frames of image data of the target display channel into frame addresses of the memory in a predetermined order, and
sending a third switching signal to a read controller, so that the read controller, under the control of a read control signal, reads image data in the first address again immediately after the read controller reads out the image data in the first address, and then sequentially reads the image data in the frame addresses of the memory.
10. The device of claim 9 , wherein
sending the first switching signal to the write controller of the current display channel comprises:
synchronizing the switching instruction to a clock domain of a field synchronization signal of the current display channel to generate the first switching signal, and
sending the first switching signal to the write controller of the current display channel.
11. A display driving device, comprising:
the device for switching the display channels of claim 10 ;
at least two write controllers in one-to-one correspondence with at least two display channels, and configured to respectively write image data of corresponding display channels to the memory in a time-division manner under the control of the field synchronization signals of the corresponding display channels; and
the read controller configured to read the image data from the memory under the control of the read control signal.
12. A display device, comprising the display driving device of claim 11 and a display module configured to display based on the image data read by the read controller.
13. The device of claim 10 , wherein
the first switching signal is a pulse signal,
a pulse width of the first switching signal is smaller than that of the field synchronization signal of the current display channel, and
a falling edge of the first switching signal and a falling edge of the switching instruction occur at the same time.
14. The device of claim 13 , wherein
sending the second switching signal to the write controller of the target display channel comprises:
synchronizing the switching instruction to a clock domain of a field synchronization signal of the target display channel to generate the second switching signal, and
sending the second switching signal to the write controller of the target display channel.
15. The device of claim 14 , wherein
the second switching signal is a pulse signal,
a pulse width of the second switching signal is smaller than that of the field synchronization signal of the target display channel, and
a falling edge of the second switching signal and a falling edge of a pulse, immediately after the switching instruction, of the field synchronization signal of the target display channel occur at the same time.
16. The device of claim 15 , wherein
sending the third switching signal to the read controller comprises:
synchronizing the switching instruction to a current clock domain of the read control signal to generate the third switching signal, and
sending the third switching signal to the read controller.
17. The device of claim 16 , wherein
the third switching signal is a pulse signal,
a pulse width of the third switching signal is smaller than that of the read control signal, and
a falling edge of the third switching signal and a falling edge of a pulse of the read control signal immediately after the switching instruction occur at the same time.
18. The device of claim 17 , wherein
a pulse interval of the read control signal, a pulse interval of the field synchronization signal of the current display channel and a pulse interval of the field synchronization signal of the target display channel are equal to one another,
the read control signal is synchronized with the field synchronization signal of the current display channel, and
the read control signal is not synchronized with the field synchronization signal of the target display channel.