A non-display signal encoding method cooperating with a matrix substrate of a display module including a plurality of electrodes (111, 112) crossing each other and transmitting a plurality of display signals required for displaying an image on the display module and a plurality of non-display signals containing data information for an external receiving object, the non-display signal encoding method comprising steps of: transmitting the non-display signals by at least one of the electrodes (111, 112) during a first time; and receiving by coupling at least a part of the non-display signals by the external receiving object, wherein the electrodes (111, 112) of the matrix substrate include a plurality of first electrodes arranged along a first direction and a plurality of second electrodes arranged along a second direction, and at least one of the first electrodes or second electrodes transmits the non-display signals, wherein the first electrodes or the second electrodes include a first electrode group and a second electrode group, and each of the electrode groups (G1, G2) includes at least an electrode, wherein the first electrodes or second electrodes further include a third electrode group, wherein the second electrode group spatially separates the first electrode group from the third electrode group, wherein the non-display signals have a first state, a second state, and a third state or their any combination, and the first state, second state and third state are different from one another, wherein the method further comprises encoding the data information in the non-display signals with the first state and the third state, the first state and the third state representing respectively the encoding of "1" and "0", and the method further comprises including the second state in the non-display signals, wherein the second state is not encoding the data information but is for separating the first state and the third state, and wherein said transmitting the non-display signals during the first time comprises: transmitting by the first electrode group the non-display signals of the first state or third state, transmitting by the second electrode group the non-display signals of only the second state and transmitting by the third electrode group the non-display signals of the first state, second state or third state. transmitting the non-display signals by at least one of the electrodes (111, 112) during a first time; and receiving by coupling at least a part of the non-display signals by the external receiving object, wherein the electrodes (111, 112) of the matrix substrate include a plurality of first electrodes arranged along a first direction and a plurality of second electrodes arranged along a second direction, and at least one of the first electrodes or second electrodes transmits the non-display signals, wherein the first electrodes or the second electrodes include a first electrode group and a second electrode group, and each of the electrode groups (G1, G2) includes at least an electrode, wherein the first electrodes or second electrodes further include a third electrode group, wherein the second electrode group spatially separates the first electrode group from the third electrode group, wherein the non-display signals have a first state, a second state, and a third state or their any combination, and the first state, second state and third state are different from one another, wherein the method further comprises encoding the data information in the non-display signals with the first state and the third state, the first state and the third state representing respectively the encoding of "1" and "0", and the method further comprises including the second state in the non-display signals, wherein the second state is not encoding the data information but is for separating the first state and the third state, and wherein said transmitting the non-display signals during the first time comprises: transmitting by the first electrode group the non-display signals of the first state or third state, transmitting by the second electrode group the non-display signals of only the second state and transmitting by the third electrode group the non-display signals of the first state, second state or third state.