Patent Number: 
Section: claims

1. A mask layout determination system comprising:a pattern determination unit for allocating light-transmitting regions and light-blocking regions to each of a plurality of mask layouts adapted to performing in-situ synthesis on probes of a microarray;a selection unit for selecting any one of the mask layouts;a comparison unit for comparing a proportion of the light-transmitting regions in a selected mask layout with a minimum light-transmitting proportion; anda pattern change unit for exchanging a light-blocking region of the selected mask layout with a light-transmitting region of an unselected mask layout if the proportion of the light-transmitting regions in the selected mask layout is smaller than the minimum  light-transmitting proportion. 2. The system of claim 1, wherein the minimum light-transmitting proportion is equal to or greater than about 5% of a total proportion of the  light-transmitting and light-blocking regions. 3. The system of claim 1, wherein the light-transmitting and light-blocking regions respectively correspond to probe cells of the microarray. 4. The system of claim 3, wherein the light-blocking region of the selected mask layout and the light-transmitting region of the unselected mask layout, which are exchanged with each other, correspond to the same probe cell. 5. The system of claim 3, wherein the selected mask layout compared by the comparison unit is a mask layout selected by the selection unit and having at least one of the light-transmitting and light-blocking regions exchanged by the pattern change unit. 6. The system of claim 3, further comprising an examination unit for examining whether a desired target probe is in-situ synthesized using the mask layouts which comprise the mask layout whose light-blocking region is exchanged with the light-transmitting region by the pattern change unit. 7. A mask layout determination method comprising:allocating light-transmitting regions and light-blocking regions to each of a plurality of mask layouts which perform in-situ synthesis on probes of a microarray; andexchanging by a computer a light-blocking region of a mask layout with a light-transmitting region of another mask layout wherein a proportion of the light-transmitting regions in each mask layout is equal to or greater than a minimum light-transmitting proportion. 8. The method of claim 7, wherein the minimum light-transmitting proportion is equal to or greater than about 5% of a total proportion of the  light-transmitting and light-blocking regions. 9. The method of claim 7, wherein the light-transmitting and light-blocking regions respectively correspond to probe cells of the microarray. 10. The method of claim 9, wherein the light-blocking region of a mask layout and the light-transmitting region of the another mask layout, which are exchanged with each other, correspond to the same probe cell. 11. The method of claim 10, wherein any one of synthesis target monomers is allocated to each of the mask layouts, and the light-blocking and  light-transmitting regions are exchanged with each other between different mask layouts to which the same synthesis target monomer has been allocated, wherein an order of the synthesis target monomers allocated to the light-transmitting regions respectively corresponding to the probe cells remains unchanged before and after the exchange. 12. The method of claim 9, further comprising examining whether a desired target probe is in-situ synthesized using the mask layouts which comprise each mask layout whose light-blocking region is exchanged with a light-transmitting region. 13. A method of fabricating a mask set, the method comprising:allocating light-transmitting regions and light-blocking regions to each of a plurality of mask layouts which perform in-situ synthesis on probes of a microarray;exchanging a light-blocking region of a mask layout with a light-transmitting region of another mask layout wherein a proportion of the light-transmitting regions in each mask layout is equal to or greater than a minimum light-transmitting proportion; andfabricating a plurality of masks using the mask layouts which comprise each mask layout whose light-blocking region is exchanged with a light-transmitting region. 14. The method of claim 13, wherein the minimum light-transmitting proportion is equal to or greater than about 5% of a total proportion of the  light-transmitting and light-blocking regions. 15. The method of claim 13, wherein the light-transmitting and light-blocking regions respectively correspond to probe cells of the microarray. 16. The method of claim 15, wherein the light-blocking region of a mask layout and the light-transmitting region of the another mask layout, which are exchanged with each other, correspond to the same probe cell. 17. The method of claim 16, wherein any one of synthesis target monomers is allocated to each of the mask layouts, and the light-blocking and  light-transmitting regions are exchanged with each other between different mask layouts to which the same synthesis target monomer has been allocated, wherein an order of the synthesis target monomers allocated to the light-transmitting regions respectively corresponding to the probe cells remains unchanged before and after the exchange. 18. The method of claim 15, further comprising examining whether a desired target probe is in-situ synthesized using the mask layouts which comprise each mask layout whose light-blocking region is exchanged with a light-transmitting region.