Display drive control device and electric device including display device
View Patent ↗In a system including a color liquid crystal panel, a drive control device for driving the panel, and a microprocessor, the drive control device reduces the burden on the microprocessor as well as power consumption. In a liquid crystal display drive control device that incorporates a memory for storing image data displayed on a color liquid crystal panel, reads out the image data sequentially from the memory, generates image signals of the three primary colors for each pixel of the panel, and outputs the image signals from external output terminals, the drive control device includes a transparency arithmetic circuit that applies calculation processing to two image data read out from built-in memory and generates data for a transparent display, supplies display data generated by the transparency arithmetic circuit to a driver, and makes the driver generate and output drive signals to the liquid crystal panel.
1. A display drive control device on a semiconductor chip, the display drive control device comprising:
a display memory that stores display image data including first and second image data, the display memory having a storage capacity capable of storing an amount of display image data larger than display data for one screen of a display device;
a transparency arithmetic circuit coupled to an output of the display memory, the transparency arithmetic circuit executing transparency arithmetic processing to the first image data read out from the display memory and the second image data read out from the display memory to provide transparent display data relating to the first and second image data;
an output circuit coupled to receive an output of the transparency arithmetic circuit and providing drive signals to the display device; and
a plurality of registers capable of setting positions in which the second image data are displayed.
2. A display drive control device according to claim 1 ,
wherein the second image data stored in the display memory include codes of each of three primary colors and codes representing a transparency rate or a bit-shifting quantity.
3. A display drive control device according to claim 2 ,
wherein the transparency arithmetic circuit executes bit shifting processing to the first image data read out from the display memory and the second image data read out from the display memory in accordance with the codes representing the transparency rate or bit-shifting quantity, thereafter adding the bit-shifted data to provide the transparent display data.
4. A display drive control device according to claim 2 , further comprising:
a plurality of registers capable of setting storage locations inside the display memory in which the second image data are stored.
5. A display drive control device according to claim 4 , further comprising:
a register capable of setting storage locations inside the display memory in which the first image data are stored.
6. A display drive control device according to claim 2 ,
wherein the first image data and the second image data are read out by means of a time-division system during the transparency arithmetic processing by the transparency arithmetic circuit.
7. A display drive control device according to claim 6 , wherein the transparency arithmetic circuit includes:
a first bit shifter,
a second bit shifter, and
an adder, and
wherein the first bit shifter executes a bit shifting to the first image data read out from the display memory, the second bit shifter executes the bit shifting to the second image data read out from the display memory, and thereafter the adder adds the first and second image data having experienced the bit shifting.
8. A display drive control device according to claim 7 , wherein each of the first and second bit shifters is capable of one-bit shifting.
9. A display drive control device according to claim 8 , wherein the transparency arithmetic circuit includes:
a latch circuit coupled to an output of the adder, and
a path that transmits the first image data or the second image data latched by the latch circuit to the first or the second bit shifter.
10. A display drive control device according to claim 2 , further comprising:
a bit processing circuit that switches any bits of the codes each representing the three primary colors of the second image data inputted from the outside and bits of the codes representing the transparency rate or the bit-shifting quantity to supply to the display memory.
11. An electronic device, comprising a display drive control device according to claim 1 , a display device driven by the display drive control device, and a system control device that executes setting related to generation of display data written in the display memory and write position information of the display data,
wherein when the system control device makes the display device display image data synthesized, read out from the display memory, or when it makes the display device display image data not being synthesized, the system control device transfers the image data of the same format.
12. A display drive control device on a semiconductor chip, the display drive control device comprising:
a display memory which stores display image data including:
first image data having first codes of each of three primary colors, and
second image data having second codes of each of the three primary colors and third codes representing a transparency rate;
a transparency arithmetic circuit which is coupled to outputs of the display memory and which executes a transparency arithmetic processing to the first codes of the first image data read out from the display memory and the second codes of the second image data in accordance with the third codes so as to provide transparent display data with respect to the first and second image data;
an output circuit coupled to receive transparent display data and providing drive signals to a display panel; and
a plurality of registers capable of setting positions in which the second image data are displayed.
13. A display drive control device according to claim 12 , further comprising:
a plurality of registers capable of setting storage locations inside the display memory in which the second image data are stored.
14. A display drive control device according to claim 13 , further comprising:
a register capable of setting storage locations inside the display memory in which the first image data are stored.
15. A liquid crystal display drive control device on a semiconductor chip, the liquid crystal display drive control device comprising:
a display memory which stores display image data to be displayed on a liquid crystal display panel, the display image data including:
first image data including a plurality of pixel data each of which has a first code relating to red, green and blue color, and
second image data including a plurality of pixel data each of which has a second code relating to red, green and blue color, and a third code representing a transparency rate;
a transparency arithmetic circuit which is coupled to an output of the display memory and which executes transparency arithmetic processing to the first code of the first image data read out from the display memory and the second code of second image data in accordance with the third code so as to provide transparent display data with respect to the first and the second image data;
an output circuit coupled to receive transparent display data and providing drive signals to a liquid crystal display panel; and
a plurality of registers capable of setting positions in which the second image data are displayed.
16. A liquid crystal display drive control device according to claim 15 , further comprising:
a plurality of registers capable of setting storage locations inside the display memory in which the second image data are stored.
17. A liquid crystal display drive control device according to claim 16 , further comprising:
a register capable of setting storage locations inside the display memory in which the first image data are stored.
18. A liquid crystal display drive control device according to claim 15 , wherein the transparency rate of the third code indicates one of:
a first condition in which the first image data is displayed on the liquid crystal display panel in 100% display and the second image data is not displayed on the liquid crystal display panel,
a second condition in which the first and the second image data are displayed on the liquid crystal display panel in 50% transparent display, or
a third condition in which the first image data is not displayed on the liquid crystal display panel and the second image data is displayed on the liquid crystal display panel in 100% display.
19. A liquid crystal display drive control device on a semiconductor chip, the liquid crystal display drive control device comprising:
a display memory which stores display image data to be displayed on a liquid display panel, the display image data including:
first image data including a plurality of pixel data each of which has a first code relating to red, green and blue color, and
second image data including a plurality of pixel data each of which has a second code relating to red, green and blue color, and a third code representing a transparency rate;
a transparency arithmetic circuit which is coupled to an output of the display memory and which executes transparency arithmetic processing to the first code of the first image data read out from the display memory and the second code of second image data in accordance with the third code so as to provide transparent display data with respect to the first and second image data, the transparency rate of the third code indicating one of a first condition in which the first image data is displayed on the liquid crystal display panel in 100% display and the second image data is not displayed on the liquid crystal display panel, a second condition in which the first and second image data are displayed on the liquid crystal display panel in 50% transparent display, or a third condition in which the first image data is not displayed on the liquid crystal display panel and the second image data is displayed on the liquid crystal display panel in 100% display;
an output circuit coupled to receive transparent display data and providing drive signals to a liquid crystal display panel; and
a plurality of registers capable of setting positions in which the second image data are displayed.
20. A liquid crystal display drive control device according to claim 19 , further comprising:
a plurality of registers capable of setting storage locations inside the display memory in which the second image data are stored.
21. A liquid crystal display drive control device according to claim 20 , further comprising:
a register capable of setting storage locations inside the display memory in which the first image data are stored.
22. A display drive control device on a semiconductor chip, the display drive control device comprising:
a display memory which stores display image data including:
first image data having first codes of each of three primary colors, and
second image data having second codes of each of the three primary colors and third codes representing a transparency rate;
a transparency arithmetic circuit which is coupled to an output of the display memory and which executes transparency arithmetic processing to the first codes of the first image data read out from the display memory and the second codes of second image data in accordance with the third codes so as to provide transparent display data with respect to the first and second image data;
an output circuit coupled to receive transparent display data and providing drive signals to a display panel; and
a plurality of registers capable of setting positions in which the second image data are displayed,
wherein the transparency rate of the third codes indicate one of:
a first condition in which the first image data is displayed on the liquid crystal display panel in 100% display and the second image data is not displayed on the liquid crystal display panel,
a second condition in which the first and second image data are displayed on the liquid crystal display panel in 50% transparent display, or
a third condition in which the first image data is not displayed on the liquid crystal display panel and the second image data is displayed on the liquid crystal display panel in 100% display.
23. A liquid crystal display drive control device according to claim 22 , further comprising:
a plurality of registers capable of setting storage locations inside the display memory in which the second image data are stored.
24. A liquid crystal display drive control device according to claim 23 , further comprising:
a register capable of setting storage locations inside the display memory in which the first image data are stored.