Abstract: A correction voltage retaining capacitor C2, a correction voltage write transistor Tr4, and a switching transistor Tr5 are added to a pixel structure of an SES drive method provided with an organic EL element E1 as a light emitting element, a light emission drive transistor Tr1, a data write transistor Tr2, and an erase transistor Tr3 which can erase electrical charges in a light emission maintaining capacitor C1. With the ON operation of the erase transistor Tr3, the correction voltage write transistor Tr4 is turned on, and the switching transistor Tr5 is turned off. In this state, the threshold voltage (Vth) of the light emission drive transistor Tr1 is written in the correction voltage retaining capacitor C2. When pixels are lit, by a gate-to-source voltage obtained by adding the threshold voltage written in the correction voltage retaining capacitor C2 to a data voltage written in the light emission maintaining capacitor C1, drain current of the light emission drive transistor Tr1 flows.

Abstract: In a self light emitting display device of the present invention, a first electrode 3 for example formed of a thin film of ITO is formed in a striped pattern on a glass substrate 2, and a film of a light emission functional layer 6 is formed thereon. A metallic second electrode 7 is formed on the light emission functional layer 6, and a light transmitting sealing member 8 for example formed of a glass material is superimposed on the second electrode 7. Apertures 7a for allowing image light from the light emission functional layer 6 to pass through are formed on a part of the second electrode 7, a first light emitting area L1 is formed in the glass substrate 2 side, and a second light emitting area L2 is formed in the sealing member 8 side. As a result, display images can be visually recognized on both front and rear surfaces.

Abstract: A display data detection means 4b detects whether arrangements of video data corresponding to one scan and video data corresponding to the next scan are the same. When it is judged that the arrangements are not the same, the display data detection means 4b issues instructions to open gates to AND gates 6 and 7. Therefore, when the arrangements of the video data of two consecutive scanning lines are not the same, the data driver 2 operates for every scan, and outputs display data which are different for every scan to a display panel. When the above-mentioned display data detection means 4b judges that the arrangements of the video data of the two consecutive scanning lines are the same, the gates of AND gates 6 and 7 are closed. Thus, the operation of the data driver 2 is stopped, and a latch circuit in the data driver 2 holds the previous video data and outputs the same display data for every scan to the display panel.

Abstract: In a related art mobile telephone system, the generation of an RBT (ring back tone) and a busy tone is realized by transmitting data registered in a network system to a calling telephone. In a mobile telephone system according to this invention, RBT data and the like are previously registered in a called telephone, and when a calling telephone originates a call to this called telephone, data corresponding to an operating state of the called telephone is transmitted to the calling telephone. Accordingly, an RBT and the like can be easily changed with a user's original melody or the like, whereby it is possible to improve service for the user.

Abstract: An apparatus for driving a self-luminescent display panel is provided with a plurality of luminescent elements 14 that are arranged at intersection positions of a plurality of data lines and a plurality of scanning lines. One frame period is time-divided into N subframe periods (N is a positive integer). A gradation display is set by an accumulated sum of one or plural lighting control periods. The apparatus is provided with first gradation control means (21, 24, 25, 26, 30) for lighting at least two other subframe periods at a brightness level a in addition to subframe periods lit at a brightness level a-1, assuming that a is an integer satisfying 0<a<N.

Abstract: A driving device 100 of a luminescent display panel in which luminescent elements 14 each having luminescence controlled by a luminescence driving transistor 12 are arranged at intersecting positions of a plurality of data lines and a plurality of scanning lines and in which pixels each including a plurality of sub-pixels 30 having different luminescent colors are arranged at the luminescent elements 14, includes: scanning means 25 that scans all of the pixels formed on the luminescent display panel by scanning the sub-pixels during a plurality of sub-pixel scanning periods set at different timings for the respective luminescent colors in one frame period or in respective sub-frame periods formed by time-dividing the one frame period; and color balance controlling means 21 that controls a ratio of relative luminescence times of the respective different luminescent colors in the sub-pixel scanning period.

Abstract: A drive device for a light-emitting display panel in which pixels respectively including light-emitting elements are arranged at crossing positions of a plurality of data lines and a plurality of scanning selection lines in the form of a matrix. A 1-frame period is time-divided into a plurality of sub-frame periods, grayscale bits for setting ON periods are allocated to the sub-frames, respectively, to perform weighting, grayscale display is performed by summing the ON periods of the sub-frames, and a frame frequency of the 1-frame period is set within a range of 100 Hz to 150 Hz.

Abstract: A correction voltage retaining capacitor C2, a correction voltage write transistor Tr4, and a switching transistor Tr5 are added to a pixel structure of an SES drive method provided with an organic EL element E1 as a light emitting element, a light emission drive transistor Tr1, a data write transistor Tr2, and an erase transistor Tr3 which can erase electrical charges in a light emission maintaining capacitor C1. With the ON operation of the erase transistor Tr3, the correction voltage write transistor Tr4 is turned on, and the switching transistor Tr5 is turned off. In this state, the threshold voltage (Vth) of the light emission drive transistor Tr1 is written in the correction voltage retaining capacitor C2. When pixels are lit, by a gate-to-source voltage obtained by adding the threshold voltage written in the correction voltage retaining capacitor C2 to a data voltage written in the light emission maintaining capacitor C1, drain current of the light emission drive transistor Tr1 flows.

Abstract: A drive device of a self light emitting display panel which is equipped with a plurality of light emitting elements arranged at intersection positions between a plurality of data lines and plurality of scan lines comprises a first gradation control means (21, 24, 25, 26, 30) for time-dividing one frame period into N (N is a positive integer) subframe periods to set gradation display by the total of one or plural lighting control periods wherein where a and b are integers which satisfy 0<a<b<N, at an intensity level a, in addition to subframe periods during which lighting is performed at an intensity level a-1, the first gradation control means allows other one subframe period to be lit, and at an intensity level b, in addition to subframe periods during which lighting is performed at an intensity level b-1, the first gradation control means allows at least other two or more subframe periods to be lit.

Abstract: A drive device of a self light emitting display panel which is equipped with a plurality of organic EL elements 14 arranged at intersection positions between a plurality of data lines and plurality of scan lines comprises a first gradation control means for time-dividing a frame period into a plurality of subframe periods and setting gradation of each pixel by the sum of lighting periods of one or plural subframe periods, a second gradation control means for treating mutually adjacent plural pixels as a group and performing dither processing on a per group basis, and a reverse bias voltage applying means 27 for applying a reverse bias voltage to the light emitting elements. A subframe period to be a non-lighting period is provided in the plural subframes so that during this period the reverse bias voltage is applied to all light emitting elements by the reverse bias voltage applying means.

Abstract: In a drive device of a light emitting display panel by a pixel structure of a SES drive method comprising an organic EL element E1 as a light emitting element, a light emission drive transistor Tr1, a scan selection transistor Tr2, and an erase transistor Tr3, in order to remove electrical charges accumulated in the EL element E1, a reset transistor Tr4 is arranged between both terminals of the EL element E1 in parallel thereto, and the gate of the reset transistor is commonly connected to the gate of the erase transistor. With this structure, the erase transistor Tr3 and the reset transistor Tr4 are both turned on by an erase signal from an erase driver so that electrical charges accumulated in the EL element E1 and electrical charges of a light emission maintaining capacitor can be discharged at the same time. Thus, a rising characteristic of light emission of the EL element E1 in each subframe can be made nearly uniform.

Abstract: An external power source control system for a portable telephone includes: a regulator 5 connected at an input thereof to a battery power source 1 or an external power source 2 and outputting a power supply voltage; a one-shot pulse generating circuit 6 generating a one-shot pulse when the external power source 2 is connected to the portable telephone; a reset circuit 7 outputting a reset signal when the power supply voltage reaches a predetermined threshold level; and a controller maintaining an output of the power supply voltage from said regulator 5, based on the one-shot pulse, and canceling the maintenance of the output of the power supply voltage from said regulator 5, based on a predetermined instruction indicating that the power is not necessary.

Abstract: A self light emission display device which substantially enables dual scan drive by one data driver comprises a plurality of scan lines K1, K2, . . . which are arranged in a horizontal direction, a plurality of data lines A1, A2, . . . which intersect these scan lines and are arranged in a vertical direction, and a plurality of light emitting elements Ra11, Rb11, . . . arranged on intersecting areas of the scan lines and the data lines. Cathode terminals of the light emitting elements whose anode terminals are connected respectively to the two adjacent data lines A1, A2 are connected to different scan lines one by one. Any two of the scan lines are selected for scanning simultaneously. Thus, since light emission duty of each EL element can also be approximately doubled, instantaneous light emission intensity of each EL element can be set low, and stress on the EL elements can be reduced.

Abstract: An active matrix type EL display device is constructed in such a way that a reverse bias voltage can be effectively applied to an EL element without decreasing the lighting time rate thereof. An EL element E1 constituting one pixel 10 is driven to be lit by a write transistor Tr1 and a driving transistor Tr2 and the lighting time of the EL element is controlled by an erase transistor Tr3 so that a multi-gradation expression is realized. The drain of a reverse bias applying transistor is connected to the anode terminal of the EL element E1, and the gate and the source of the same transistor Tr4 are connected to the respective gates of the erase transistor Tr3 and the write transistor Tr1, respectively. By this structure, an ON operation of the reverse bias applying transistor Tr4 is implemented in synchronization with an ON operation of the erase transistor Tr3 so that a reverse bias voltage can be supplied to the EL element E1.

Abstract: In a self light emitting display device of the present invention, a first electrode 3 for example formed of a thin film of ITO is formed in a striped pattern on a glass substrate 2, and a film of a light emission functional layer 6 is formed thereon. A metallic second electrode 7 is formed on the light emission functional layer 6, and a light transmitting sealing member 8 for example formed of a glass material is superimposed on the second electrode 7. Apertures 7a for allowing image light from the light emission functional layer 6 to pass through are formed on a part of the second electrode 7, a first light emitting area L1 is formed in the glass substrate 2 side, and a second light emitting area L2 is formed in the sealing member 8 side. As a result, display images can be visually recognized on both front and rear surfaces.

Abstract: The present invention is to provide a dot matrix type display device by self light emitting elements in which a display burning phenomenon can be prevented from occurring. With the dot matrix type display device according to the present invention, in the display device in which a plurality of self light emitting elements are arranged in a dot matrix pattern, one or more icons, pictures, letters/characters, and the like are displayed at least on a part of a display area of the display device. The display origin of said one or more icons, pictures, letters/characters, and the like are moved at least one dot or more and displayed by movement display means one after another.

Abstract: Power saving is more realized when a partial display is executed in active matrix type EL display elements. When the partial display is executed, a scan driver 2 repeatedly scans all the scan lines as executed ordinarily. In contrast, when a scan shifts from a display region to a non-display region, black display data is captured by a shift resister 1a in a data driver 1 for one horizontal period and latched by a latch circuit 1b. Then, while the non-display region is being scanned, the drive of the data driver 1 is stopped. Accordingly, in the scan of the non-display region, a non-display state is achieved by the black display data latched by the latch circuit 1b. Low power consumption can be realized because the drive of the data driver 1 operating at a high speed is stopped while the non-display region is being scanned.

Abstract: In order to provide, as a lighting means for a pixel including a driving TFT and an EL element, a driving device of a light emitting display panel which can dissolve respective technical problems which occur in cases where respective constant voltage driving and constant current driving techiniques are adopted, a light emitting power holding capacitor C2 is connected in series to the driving TFT (Tr2) and the EL element E1. A diode D1 for charging electrical charges in the capacitor C2 and a switching element SW2 for supplying current to the diode D1 are provided. By an ON operation of the switching element SW2 both ends of the capacitor C2 is subjected to a charge operation so as to become equipotentials. By an OFF operation of the switching element SW2, driving current flows in the EL element E1 via the driving TFT (Tr2). The amount of current flowing in the EL element E1 is controlled by the repeat frequency of ON/OFF of the switching element SW2.

Abstract: In a related art mobile telephone system, the generation of an RBT (ring back tone) and a busy tone is realized by transmitting data registered in a network system to a calling telephone. In a mobile telephone system according to this invention, RBT data and the like are previously registered in a called telephone, and when a calling telephone originates a call to this called telephone, data corresponding to an operating state of the called telephone is transmitted to the calling telephone. Accordingly, an RBT and the like can be easily changed with a user's original melody or the like, whereby it is possible to improve service for the user.

Abstract: Power saving is more realized when a partial display is executed in active matrix type EL display elements.