Abstract:
A display device including independent power sources for a display use and a detection use, display elements, switches ( 21, 22  and  23 ) for independently connecting the power sources and the individual elements, a circuit ( 10 ) for controlling the switches, and a variable amplifier ( 16 ) as detection means, which reads a state of each pixel of a display panel section ( 2 ), which generates a read result in a controllable shape, and which can change-over a detection result from an external sensor section ( 3 ) and an internal detection result through a timing control, so as to convert the detection result into a value corresponding to a subject to-be-detected, whereby detections can be performed with a detection circuit of one loop.

Description:
CLAIM OF PRIORITY 
     The present application claims priority from Japanese application serial no. 2007-237165 filed on Sep. 12, 2007, the content of which is hereby incorporated by reference into this application. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a display device whose luminance is controllable in accordance with a current quantity applied to a display element, or a light emitting time period. More particularly, it relates to a display device which is configured of display elements represented by an emissive type, also termed “organic EL (ElectroLuminescence) or organic light emitting diodes”. 
     2. Description of the Related Art 
     Owing to the spread of various information processors, there are various display devices complying with roles. Among them, a display employing organic EL elements (an organic EL display device) has been highlighted as a display device of emissive type. An OLED or the like light emitting element for use in the display device does not require backlight as in a liquid-crystal display (liquid-crystal display device), and it is suited to a lower power consumption. Moreover, as compared with the liquid-crystal display, the organic EL element has merits such as a higher pixel visibility and a higher response rate. 
     Further, the organic EL element has characteristics similar to those of a diode, and its luminance can be controlled by a current quantity which is caused to flow through the element. Driving methods in such an emissive type display device are disclosed in JP-A-2006-91709, etc. Besides, regarding a configuration in which a touch panel or the like input device is incorporated into such a display device, JP-A-10-49305, etc. can be mentioned. 
     As the characteristic of the organic EL element (OLED), the internal resistance value of the element changes, depending upon a service period or an ambient environment. Especially, the organic EL element has the property that, when the service period increases, the internal resistance heightens secularly, so a current to flow through the element decreases. Therefore, when the pixels of an identical place within a screen, for example, a menu display are lit up for a long time, an burn-in phenomenon occurs in the place. For coping with the burn-in phenomenon, the state of the pixel needs to be detected. A method for the detection is one in which the pixel state is detected in the blanking period of display data. In the blanking period, the pixel is not caused to emit light, and hence, a displaying voltage is not applied. Therefore, using a power source separate from a power source for the light emission, a certain fixed current is applied to the pixel in the blanking period, and a voltage in this state is detected, whereby a degradation in the burn-in is detected from the change of the voltage. Besides, since the current cannot be applied to the pixel during a display period, a circuit for the above detection is used only in the blanking period. 
     Meanwhile, in order to detect a temperature characteristic and an ambient brightness and to detect a touch panel or the like input sensor used, similar detection circuits are respectively necessitated. In furnishing the system of the display device with the detection circuits, further controllers or the like control means are necessitated for coping with the burn-in detection, the temperature characteristic detection and the ambient brightness detection, and a circuit scale becomes large. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to cope with the detection of the burn-in degradation of an OLED, the detection of the temperature characteristic of the OLED, the detection of a sensor panel, etc. by a circuit of one detection loop, and to share the circuit of one detection loop, thereby to reduce a circuit scale. 
     According to one aspect of performance of the invention, a display device includes independent power sources for a display use and a detection use, display elements, switches for independently connecting the power sources and the individual elements, a circuit for controlling the switches, and a variable amplifier as detection means, which has the function of reading the state of each pixel and the internal detection function of generating the read result in a controllable shape, and which can change-over a detection result from an external sensor and an internal detection result through a timing control, so as to convert the detection result into a value corresponding to a subject to-be-detected, whereby the detections can performed by the detection circuit of one loop. 
     In the above configuration, detection devices which are connected to the detection circuit are sequentially changed-over in a display period and a blanking period, and the gain and timing of an adaptive amplifier are controlled in accordance with the subject to-be-detected, thereby to obtain an image display device in which the plurality of detection devices are detectable with the identical detection circuit. 
     The circuit and controller of the detection loop are shared for a plurality of detection loops, whereby the circuit scale can be reduced. 
     By way of example, according to the first embodiment of the invention to be described later, an internal pixel state and an external detection device can be detected by an identical detection circuit. Besides, according to the second embodiment of the invention, a plurality of external detection devices and an internal pixel state can be detected by an identical detection circuit. In addition, according to the third embodiment of the invention, an internal pixel state and an external detection device which needs to be regularly detected can be detected by an identical detection circuit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a system architectural diagram for explaining the whole configuration of an image display device according to the present invention; 
         FIG. 2  is a diagram for explaining the configuration of a pixel which exists within a display panel section  2  in  FIG. 1 ; 
         FIGS. 3A and 3B  are circuit diagrams for explaining configurational examples of changeover switches within a driver  1  in  FIG. 1 , respectively; 
         FIGS. 4A and 4B  are diagrams for explaining the configuration of an adaptive amplifier  16  in  FIG. 1 , respectively; 
         FIG. 5  is a system architectural diagram for explaining the internal configuration of a controller  10  in  FIG. 1 ; 
         FIG. 6  is a diagram for explaining the timings of displays and detections in the first embodiment of the invention; 
         FIG. 7  is a control flow chart of the controller  10  in  FIG. 1 ; 
         FIG. 8  is a control flow chart of a control loop in  FIG. 1 ; 
         FIG. 9  is a control flow chart of a detection loop in  FIG. 1 ; 
         FIG. 10  is a circuit diagram for explaining the second embodiment of the invention, in which parts relevant to  FIGS. 3A and 3B  for explaining the first embodiment are differently configured; 
         FIG. 11  is a diagram for explaining the timings of displays and detections in the second embodiment of the invention; and 
         FIG. 12  is a diagram for explaining the timings of displays and detections in the third embodiment of the invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Now, the best mode for carrying out the present invention will be described in detail with reference to the drawings. 
     First Embodiment 
       FIG. 1  is a system architectural diagram for explaining the whole configuration of an image display device according to the invention. When broadly divided, the configuration consists of a display driver  1 , a display panel section  2  and a sensor section  3 . The display panel section  2  includes a plurality of pixel circuits which are matrix-arrayed in a row direction (scanning line direction) and a column direction (data line direction). The sensor section  3  includes operating environment sensors such as an burn-in sensor, a temperature sensor and an ambient light sensor, and external input equipments such as a touch panel being information input means. 
     A RAM  5  and a CPU  6  are connected to the display driver  1  through a control bus  4 . Although only the RAM  5  and the CPU  6  are mentioned as principal devices here, other devices such as a ROM and various I/O controllers may well be connected. The display driver  1  includes a controller  10 , which controls various portions within the display driver  1 . Besides, the controller  10  performs the controls of writing detection data from the various sensors, into the RAM  5 , and fetching display data to be displayed in the display panel section  2 , from the RAM  5 . 
     A data line  11  and a detection line  14  are connected to the controller  10 . Although only one data line  11  and only one detection line  14  are shown in  FIG. 1 , such lines are actually laid in the number of columns (the number of data lines) of the pixels of a display panel constituting the display panel section  2 . A D/A converter  12  and an amplifier  13  exist on the data line  11 . Besides, an A/D converter  15 , an adaptive amplifier  16  and a power source  18  exist on the detection line  14 . The data line  11  is also an output line from the controller  10 . The display data and precharge data are outputted to the output line so as to be inputted to the D/A converter  12 , the output value of which is amplified by the amplifier  13 . The data line  14  is also an input line to the controller  10 . 
     The input line serves to input several sorts of detection results to the controller  10 . The detection results are converted into digital values by the A/D converter  15  through the adaptive amplifier  16 , and the digital value is inputted to the controller  10 . The adaptive amplifier  16  plays the role of clamping detection values of different voltage levels into a certain fixed range. The controller  10  controls the adaptive amplifier  16  and the detecting power source  18  through a control line  17 . The driver  1  and the display panel section  2  are connected by a control line  19 , while the driver  1  and the sensor section  3  are connected by a control line  20 . 
     The control line  19  is connected with the data line  11  through a switch  21 , and with the detection line  14  through a switch  22 . The control line  20  is connected with the detection line  14  through a switch  23 . The switches  21 ,  22  and  23  are controlled by a control line  24  led from the controller  10 . The control line  24  may control the switches  21 ,  22  and  23  either independently or collectively, and this control line  24  is configured of a plurality of lines in the case of the independent controls. Various detection devices which include the temperature sensor, an illuminance sensor, a chromaticity sensor and a sound sensor, and the touch panel and other input devices, can be connected in the sensor section  3 . 
       FIG. 2  is a diagram for explaining the configuration of the pixel which exists within the display panel section  2  in  FIG. 1 . The invention relates to the image display device, and an organic EL display device (OLED) will be described as one example of the image display device here. Referring to  FIG. 2 , a voltage source  27  is a displaying power source, and it is connected with a display element  25  by a pixel control unit  26 . The control line  19  serves as an input/output line for sending and receiving data. An input to the display panel section  2 , that is, display data is processed by the pixel control unit  26  so as to drive the display element  25  by the displaying power source  27 . An output from the display panel unit  2 , that is, detection data passes through a selection switch  28  from the display element  25 , and it is inputted to the driver  1  through the control line  19 . The drive power source of the display element  25  on this occasion is the power source  18 . Since the detection data indicates a pixel state, it can be used for the detection of burn-in. 
       FIGS. 3A and 3B  are circuit diagrams for explaining configurational examples of the changeover switches within the driver  1  in  FIG. 1 , respectively.  FIG. 3A  shows the configuration in which the respective switches are controlled by independent lines. Here, the control line  30  controls the connection of the control line  19  and the data line  11  by the switch  21 . Besides, the control line  31  controls the connection of the control line  19  and the detection line  14  by the switch  22 . In addition, the control line  32  controls the connection of the control line  20  and the detection line  14  by the switch  23 . Since the control lines  30 ,  31  and  32  can perform the control operations independently of one another, the ON/OFF operations of the switches  21 ,  22  and  23  can be respectively controlled at any desired timings. 
     On the other hand,  FIG. 3B  shows the configuration in which the respective switches are uniquely controlled. A control line  33  controls the connection of the control line  19  and the data line  11  by the switch  21 , and it controls the connection of the control line  20  and the detection line  14  by the switch  23 . Besides, an inverter  35  serves to invert the signal of the control line  33 , and a control line  34  receiving the output of the inverter  35  controls the connection of the control line  19  and the detection line  14  by the switch  22 . The control lines  33  and  34  bear inverted signals, so that the switch  22  falls into an OFF state when the switches  21  and  23  are in ON states, and it falls into an ON state when the switches  21  and  23  are in OFF states. These operations are simultaneously performed. In  FIG. 3A , the number of the control lines is large, but any desired switch controls are possible. In  FIG. 3B , the number of the control lines is small, but the operations are fixed. 
       FIGS. 4A and 4B  are diagrams for explaining the configuration of the adaptive amplifier  16  in  FIG. 1 .  FIG. 4A  shows the internal configuration of the adaptive amplifier  16 . This adaptive amplifier  16  includes a variable resistor  40  which can be controlled by the control signal  17  from the controller  10 , a fixed resistor  41 , and an amplifier  42 . 
       FIG. 4B  shows the contents of a table  44  which indicates the set modes  45  of the adaptive amplifier  16  and the resistance values  46  of the variable resistor  40 . Each set mode  45  pairs with a subject for detection. The controller  10  selects the set mode  45  in accordance with the detection range of the detection portion, and it sets the amplifier by using the resistance value  46  corresponding to the set mode. In a case where the resistance values  46  are used as fixed values, the table  44  may be stored in a memory within the driver  1 , and it may well be stored in a memory outside the driver  1 . On the other hand, in a case where the resistance values  46  are set at any desired values, they may be dynamically computed in conformity with the set modes  45 . 
       FIG. 5  is a system architectural diagram for explaining the internal configuration of the controller  10  in  FIG. 1 . Referring to  FIG. 5 , outside the driver  1 , a memory access unit  50  sends and receives data to and from the RAM  5  which is an external memory connected by the bus  4 . Besides, inside the driver  1 , the memory access unit  50  is connected with a correction control unit  51  and a display control unit  52  which are used in a display mode, and a precharge control unit  53  which is used in a detection mode, a switch control unit  56 , and an amplifier control unit  57 . The correction control unit  51  is a calculation unit for subjecting display data to correction processing on the basis of data obtained by detection. Regarding the correction processing, separate processes are executed for the sorts of the detections of a detection loop. By way of example, in case of the burn-in detection, a degradation is corrected in correspondence with the degree of burn-in, and in case of the temperature characteristic detection, a temperature fluctuation component is corrected. 
     The display control unit  52  transmission-controls the display data corrected by the correction control unit  51 , in agreement with the timing of the display panel. The precharge control unit  53  fixes the voltage of the data line  11  in the detection mode, and it is used for improving a response rate. A changeover control unit  54  adjusts a signal timing within the controller  10  and the timing of an external signal. A signal selection unit  55  changes-over the outputs of the display control unit  52  and the precharge control unit  53  and transmits either output to the data line  11  under the control of the changeover control unit  54 . The switch control unit  56  controls the control line  24 . 
     This control line  24  controls the selection switches of lines led to the data line  11  and the detection line  14 , and it consists of a single line or a plurality of lines in accordance with the control configuration of the switches. The amplifier control unit  57  controls the state of the adaptive amplifier from the changeover control unit  54 , and in the case of employing the setting table in order to set the adaptive amplifier, and this amplifier control unit  57  alters the setting of the adaptive amplifier with the setting information of the table prepared in a memory  58 . 
       FIG. 6  is a diagram for explaining the timings of displays and detections in the first embodiment of the invention. In this embodiment, the timings are those of the displays, the temperature detections, and the burn-in detections. Reference numeral  60  designates one frame period, which is constituted by a display period and a blanking period (non-display period) in a display loop. The display period may well further include a write period for writing the display data or display voltage into the pixel circuit, and a display (luminescence) period which presents a display (luminescence) in accordance with the written display data or display voltage. In a detection loop, one frame period  60  is constituted by a temperature detection period and an burn-in detection period. Within one horizontal period, the display period and the blanking period (non-display period) may well be included in the display loop, and the temperature detection period and the burn-in detection period in the detection loop. The timings will be explained on the basis of the configuration shown in  FIG. 3A . It is assumed that the display panel is connected to the control line  19 , while the temperature detection sensor is connected to the control line  20 . In the control of the control loop, in order to connect the data line  11  and the control line  19  in the display period  61 , the switch  21  is turned ON by the control line  30 , and the switch  22  is turned OFF by the control line  31 . 
     Besides, this period corresponds to the temperature detection period  63  in the detection loop. In the control of the detection loop, the switch  23  is turned ON by the control line  32  in order to connect the detection line  14  and the control line  20  for the purpose of the temperature detection. Thus, in these periods, the temperature detection is performed while the display is being presented. Subsequently, in the control of the display loop, in order to connect the detection line  14  and the control line  19  in the blanking period  62 , the switch  22  is turned ON by the control line  31 , and the switch  21  is turned OFF by the control line  30 . This period corresponds to the burn-in detection period  64  in the detection loop. In the control of the detection loop, the switch  23  is turned OFF by the control line  32  in order to disconnect the detection line  14  and the control line  20 . 
     Thus, in such a period, the pixel state (for example, a voltage or current) is detected. Besides, in a case where the setting of the temperature detection state is a setting-A  65  and where the setting of the burn-in detection state is a setting-B  66 , the adaptive amplifier is set in the state of the setting-A  65  during the temperature detection period  63 , and it is set in the state of the setting-B  66  during the burn-in detection period  64 , whereby the state of the amplifier is set. These operations are performed every frame, and the displays and detections are made compatible. 
       FIG. 7  is a control flow chart of the controller  10  in  FIG. 1 . When the controller  10  starts its control at a control start step  70 , the routine shifts to a step  71 . Initialization processing is performed at the step  71 , followed by a step  72 . A display operation is started at the step  72 , followed by a step  73 . At the step  73 , a detection operation is started. In the initialization processing at the step  71 , the initialization controls of various states and state inspections are carried out, thereby to initialize the interior of the system. Although the operations at the steps  72  and  73  will be stated later, the interior of the controller  10  is initialized by these steps. 
     Subsequently, at a step  74 , the signal selection unit  55  within the controller  10  is changed-over. At a step  75 , the adaptive amplifier is set by the control line  17 . At a step  76 , the changeover switches are set by the control line  24 . A detection flag is reset at a step  77 , and a display flag is set at a step  78 . The detection flag and the display flag are contained within the controller  10 , and they serve to store the state of the display loop. The display period is decided at a step  79 . The decision of the display period is rendered by a timer or a counter. 
     In a case where the display period has ended, it is shifted to the blanking period. The signal selection unit  55  within the controller  10  is changed-over at a step  80 . The adaptive amplifier is set by the control line  17  at a step  81 . The changeover switches are set by the control line  24  at a step  82 . The display flag is reset at a step  83 , and the detection flag is set at a step  84 . The blanking period is decided at a step  85 . The decision of the blanking period is rendered by a timer or a counter. In a case where the blanking period has ended, it is shifted to the display period, and the routine shifts to the step  74 . In this example, the display flag and the detection flag are simultaneously changed-over, but they can also be changed-over with a time difference. 
       FIG. 8  is a control flow chart of the display loop in  FIG. 1 . When the process of the display loop is started at a step  90 , the state of the display flag is monitored at a step  91 . In a case where the display flag is “0”, the monitoring is continued at the step  91 . When the display flag changes to “1”, the routine shifts to a step  92 , at which the memory controller unit fetches display data. Further, the memory controller unit fetches correction data at a step  93 , and conversion data are created from the display data and the correction data at a step  94 . The conversion data are transmitted to the display unit at a step  95 . At a step  96 , if the display period of one frame has ended is decided. In a case where the display of one frame has not ended, the routine is repeated from the step  92 , and the display data are transmitted to the display panel. When the display of one frame has ended, the routine shifts to a step  97 , at which the display flag is reset. In addition, the routine shifts to the step  91  so as to continue the monitoring of the display flag state. 
       FIG. 9  is a control flow chart of the detection loop in  FIG. 1 . When the process of the detection loop is started at a step  100 , the state of the display flag is monitored at a step  101 . When the display flag changes to “1”, that is, the display period begins, the detections of the sensor section are performed at a step  102 . If the display flag is in the state of “1” at a step  103 , whether or not all the detections of one time have ended is judged at a step  104 . When all the detections have not been ended, the operations from the step  102  are repeated. In a case where the display flag is “0” at the step  103 , it is indicated that the display period has ended in the course of the detection. Therefore, the routine shifts to a step  111 . 
     In a case where all the detections of one time have ended at the step  104 , the routine shifts to a step  105 . In a case where the display flag is “1” at the step  105 , the routine waits until the display flag becomes “0”. When the display flag changes to “0”, the routine shifts to the step  101 . In a case where the display flag is “0” at the step  101 , the routine shifts to a step  106 . In a case where the detection flag is “0” at the step  106 , the routine shifts to the step  101 , at which the state of the display flag is monitored. On the other hand, in a case where the detection flag is “1” at the step  106 , the routine shifts to a step  107 . Detections from the display panel section are performed at the step  107 . 
     If the detection flag is in the state of “1” at a step  108 , whether or not all the detections of one time have ended is judged at a step  109 . When all the detections have not been ended, the operations from the step  107  are repeated. In a case where the detection flag is “0” at the step  108 , it is indicated that the blanking period has ended in the course of the detection. Therefore, the routine shifts to the step  111 . In a case where all the detections of one time have ended at the step  109 , the routine shifts to a step  110 . In a case where the detection flag is “1” at the step  110 , the routine waits until the detection flag becomes “0”. When the detection flag changes to “0”, the routine shifts to the step  101 . The step  111  executes an error process. As an example of the error process, in a case where the display period or the detection period has timed-out, a procedure is traced in which the interrupted state of the routine is transmitted from the controller  10  to the CPU  6 , and in which the CPU  6  having received the signal executes the exceptional process of the operating system. 
     Second Embodiment 
       FIG. 10  is a circuit diagram for explaining the second embodiment of the invention, in which parts relevant to  FIGS. 3A and 3B  for explaining the first embodiment are differently configured. The configuration is a configuration in which inputs from a plurality of sensor sections are used for a detection loop, and it is a configuration in which respective switches are controlled by independent lines. A control line  120  controls the connection of the control line  19  and the data line  11  by the switch  21 . 
     A control line  121  controls the connection of the control line  19  and the detection line  14  by the switch  22 . A control line  122  controls the connection of the detection line  14  and any desired one of control lines  124 ,  125  and  126  by the corresponding one of the switches  123 . Since the control lines  120 ,  121  and  122  can perform the independent controls, the ON/OFF operations of the switches  21 ,  22  and  123  can be controlled at any desired timings. Further, the switches  123  have a kind of selector configuration. Therefore, in a case where the control line  122  is formed of a single line, the switches  123  can be sequentially changed-over, and in a case where the control line  122  is formed of a plurality of lines, any desired changeover of the switches  123  becomes possible. The sorts of sensors which are changed-over by the switches  123  may be in any number. 
       FIG. 11  is a diagram for explaining the timings of displays and detections in the second embodiment of the invention.  FIG. 11  indicates the timings in the case where the sensors connected to the switches  123  in  FIG. 10  detect a temperature and an illuminance alternately. Reference numeral  60  designates one frame period, which is constituted by a display period and a blanking period in a display loop. The detection loop is constituted by a temperature detection period, an illuminance detection period, and an burn-in detection period. It is assumed that the display panel is connected to the control line  19 , that the temperature detection sensor is connected to the control line  124 , and that the illuminance detection sensor is connected to the control line  125 . 
     In the control of the display loop, in order to connect the data line  11  and the control line  19  in a display period  61 , the switch  21  is turned ON by the control line  120 , and the switch  22  is turned OFF by the control line  121 . Besides, in such a period, a temperature detection period  130  and an illuminance detection period  132  are alternately set every frame in the detection loop. In the control of the detection loop, accordingly, the switches  123  are selected by the control line  122  in order to connect the detection line  14  and the control line  124  when the temperature is detected, and to connect the detection line  14  and the control line  125  when the illuminance is detected. Thus, in these periods, the detections of the sensor sections are performed while displays are being presented. 
     Subsequently, in the control of the display loop, in order to connect the detection line  14  and the control line  19  in the blanking period  62 , the switch  22  is turned ON by the control line  121 , and the switch  21  is turned OFF by the control line  120 . This period corresponds to an burn-in detection period  131  in the detection loop. In the control of the detection loop, in order to disconnect the detection line  14  and the control line  124  or  125 , all the switches  123  are turned OFF by the control line  122 . Thus, a pixel state is detected in such a period. 
     Besides, in a case where the setting of the temperature detection state is a setting-A  133 , where the setting of the burn-in detection state is a setting-B  134 , and where the setting of the illuminance detection state is a setting-C  135 , the adaptive amplifier is set in the state of the setting-A  133  during the temperature detection period  130 , it is set in the state of the setting-B  134  during the burn-in detection period  131 , and it is set in the state of the setting-C  135  during the illuminance detection period  132 , whereby the state of the amplifier is set. The detection operations by the different sensors are performed in 2-frame units, and the displays and detections are made compatible. 
     Third Embodiment 
       FIG. 12  is a diagram for explaining the timings of displays and detections in the third embodiment of the invention. In  FIG. 12 , parts relevant to  FIG. 11  for explaining the second embodiment are differently configured. The configuration is a configuration in which inputs from a plurality of sensor sections are used for a detection loop. Especially,  FIG. 12  is a timing diagram in the case where a sensor which needs must perform the detection in a certain cycle is coped with. This example indicates the timings in the case where the sensors connected to the switches  123  in  FIG. 10  detect a temperature and the touch coordinates of a touch panel alternately. 
     An input device such as the touch panel needs to be accessed at fixed intervals, and when the interval of the access changes, an inconvenience sometimes occurs in a process after the detection. That is, a highest priority level can be set for the specified input device. Reference numeral  60  designates one frame period, which is constituted by a display period and a blanking period in a display loop. In the detection loop, one frame period is constituted by temperature detection periods, touch panel detection periods, and burn-in detection periods. 
     It is assumed that the display panel, the temperature detection sensor and the touch panel sensor are respectively connected to the control line  19 , the control line  124  and the control line  125 . In the control of the display loop, in order to connect the data line  11  and the control line  19  in the display period  61 , the switch  21  is turned ON by the control line  120 , and the switch  22  is turned OFF by the control line  121 . Besides, in this period, the temperature detection periods  140  and the touch panel detection periods  141  are alternately set within one frame in the detection loop. In the control of the detection loop, the switches  123  are selected by the control line  122  in order to connect the detection line  14  and the control line  124  when the temperature is detected, and to connect the detection line  14  and the control line  125  when the touch panel is detected. Thus, in such a period, the detections of the sensor sections are performed while the display is being presented. 
     Subsequently, in the control of the display loop, the switch  21  is turned OFF by the control line  120  during the blanking period  62 . In this embodiment, the control line  125  needs to be connected to the control line  14  even during the blanking period. Therefore, in order to alternately connect the control line  19  and the control line  125  to the detection line  14 , either of the switch  22  and the switch  123  is turned ON, and the other of them is turned OFF, by the control line  121  and the control line  122 . Thus, an burn-in detection period  142  is set in a state where the detection line  14  and the control line  19  are connected, and the touch panel detection period  141  is set in a state where the detection line  14  and the control line  125  are connected. 
     Besides, in a case where the setting of the temperature detection state is a setting-A  143 , where the setting of the touch panel detection state is a setting-B  144 , and where the setting of the burn-in detection state is a setting-C  145 , the adaptive amplifier is set in the state of the setting-A  143  during the temperature detection period  140 , in the state of the setting-B  144  during the touch panel detection period  141 , and in the state of the setting-C  145  during the burn-in detection period  142 , whereby the state of the amplifier is set. The series of detection operations are performed in single-frame units, and the displays and the detections are made compatible. 
     The invention is applicable to a simple display device or a panel incorporating the display device, or the display device of an information processing terminal.