| 摘要 |
PURPOSE:To obtain the titled indicator which can set the address of a point displayed with black color and pointed by using a light pen in the CRT picture and also can make color assignment to any displaying points. CONSTITUTION:When a light pen is contacted on a piture displaying area (a) in a CRT picture, an address determining circuit 3 is opened, a coordinate signal CS is impressed upon an address judging circuit 4, and a picture area signal DS is obtained. At the same time, an address signal AD (XO, YO) is impressed upon a selecting circuit 6. The selecting circuit 6 inpresses the address signal (XO, YO) upon a picture memory 7 in the period other than the displaying period, by judging that the address signal (XO, YO) is effective as the address to the picture memory 7. Moreover, when the light pen 1 is pressed against a color assigning area (b), a color information take-in signal CI and a chrominance component CL are obtained from the address judging circuit 4 and they are written into a chrominance component register 5. The chrominance component is written into the picture memory 7 in the same way as the case of the address signal when a write signal is obtained from a gate 12. |
