초록 ▼

A reader unit for use in a radio frequency identification (RFID) system delays the initiation of an interrogation operation when potentially interfering radio frequency (RF) energy is detected within an operational frequency range of the system. The reader unit waits a quasi-random period of time af

A reader unit for use in a radio frequency identification (RFID) system delays the initiation of an interrogation operation when potentially interfering radio frequency (RF) energy is detected within an operational frequency range of the system. The reader unit waits a quasi-random period of time after the detection and then senses the spectral environment again to determine whether the energy is still present. If the energy is still present, the reader unit waits another quasi-random period and the process repeats. If there is no energy present or the energy is below a threshold value, the reader unit immediately initiates the interrogation operation. By delaying the initiation of the interrogation operation until the operative frequency range is free of potential interferers, the likelihood of harmful interference effects is significantly reduced.

대표청구항 ▼

A reader unit for use in a radio frequency identification (RFID) system delays the initiation of an interrogation operation when potentially interfering radio frequency (RF) energy is detected within an operational frequency range of the system. The reader unit waits a quasi-random period of time af

A reader unit for use in a radio frequency identification (RFID) system delays the initiation of an interrogation operation when potentially interfering radio frequency (RF) energy is detected within an operational frequency range of the system. The reader unit waits a quasi-random period of time after the detection and then senses the spectral environment again to determine whether the energy is still present. If the energy is still present, the reader unit waits another quasi-random period and the process repeats. If there is no energy present or the energy is below a threshold value, the reader unit immediately initiates the interrogation operation. By delaying the initiation of the interrogation operation until the operative frequency range is free of potential interferers, the likelihood of harmful interference effects is significantly reduced. ing a plurality of row electrode pairs extending on a backside of a front substrate in a row direction and arranged thereon in a column direction to form display lines, and a plurality of column electrodes extending in the column direction and arranged in the row direction on a face of a back substrate which is opposite to the front substrate with interposing a space and constituting a discharge cell at each intersecting position with the row electrode pair in the space formed by the back substrate and the front substrate, and phosphor layers in the three primary colors of red, green and blue, respectively, which are respectively formed in a plurality of the resulting discharge cells in order, said plasma display panel comprising: a partition wall including vertical wall portions arranged between the front substrate and the back substrate to extend in the column direction and transverse wall portions arranged between the front substrate and the back substrate to extend in the row direction, to partition the space between the front substrate and the back substrate into said discharge cells in the row direction and the column direction, wherein each of said transverse wall portions of said partition wall defining said discharge cell formed with said red phosphor layer, said discharge cell formed with said green phosphor layer and said discharge cell formed with said blue phosphor layer is varied in width in the column direction in accordance with each luminance of red, green and blue colors, to set an opening area of a front face of said each discharge cell opposing to said front substrate. 2. The plasma display panel according to claim 1, further comprising: a dielectric layer formed on a backside of said front substrate to overlay said row electrode pairs, and formed with additional portions at portions thereof facing said transverse wall portions of said partition wall to jut out toward the transverse wall portions, wherein said additional portion is set to vary in width in the column direction in accordance with the width of said transverse wall portion of said partition wall facing the additional portion in the column direction. 3. The plasma display panel according to claim 2, wherein said additional portions is formed on portions of said dielectric layer facing said transverse wall portions to jut out toward the transverse wall portions not to form a space between the additional portion and said transverse wall portion, a space is formed between the additional portion and said vertical wall portion of said partition wall. 4. The plasma display panel according to claim 1, wherein the phosphor layers are formed on side faces of said vertical wall portions and said transverse wall portions of said partition wall and a front surface of the back substrate. 5. The plasma display panel according to claim 1, further comprising: a light absorption layer formed on a portion of said partition wall opposite to said front substrate. 6. The plasma display panel according to claim 1, comprising: a light absorption layer formed on a portion between bus electrodes of said row electrodes adjacent to each other in the two display lines. 7. The plasma display panel according to claim 1, wherein each row electrode of said row electrode pair comprises a transparent electrode opposite to the other transparent electrode with interposing a discharge gap in said each discharge cell, and a bus electrode connected to an end of the transparent electrode, locating distance from the discharge gap, said transparent electrode being formed in an independent island state for each discharge cell. 8. The plasma display panel according to claim 1, wherein each of said vertical wall portions of said partition wall defining said discharge cell formed with said red phosphor layer, said discharge cell formed with said green phosphor layer and said discharge cell formed with said blue phosphor layer is equal in width in the row direction