JP5199940B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

  In recent years, a touch panel that enables intuitive operation input by combining a display unit such as a liquid crystal panel and a position input device such as a touch panel and detecting an operation position with respect to a symbol or icon displayed on the screen. Input devices are widespread.

  For example, Patent Literature 1 discloses a touch panel input device that resets touch position reference data based on a difference between past touch position data and current touch position data that is equal to or greater than a predetermined value. Further, Patent Document 2 discloses a touch panel coordinate conversion method for correcting position detection according to a shift of a detection position with respect to a touch line of a touch position.

  By the way, since it is difficult to make the touch panel completely bonded to the display unit at the time of manufacture, calibration adjustment is performed in order to correct the positional deviation between the touch position of the touch panel and the display position of the display unit. It is carried out.

  In this calibration adjustment, the aim is displayed on the test coordinates on the display unit, and the display position of this aim, that is, the difference between the touch reference position in the ideal state that is pasted without any deviation and the touch position with respect to the aim display. Is stored in a memory or the like.

  In the use stage of the touch panel, the correction value set by the calibration adjustment is read from a storage unit such as a memory, and the touch position is corrected using the read correction value. This absorbs the misalignment between the touch panel and the liquid crystal panel.

JP 07-31655 A Japanese Patent Laid-Open No. 06-35608

  However, in the above prior art, when the touch position is corrected using the correction value after calibration adjustment for correcting the touch position, when the correction value is written and there is an erroneous writing or data corruption, etc. However, since the touch position is corrected using the abnormal value, it is erroneously detected that the operation is performed at a position unrelated to the touch position, and there is a possibility that the touch panel may be erroneously operated.

  Therefore, the present invention has been made to solve the above-described problems (problems) caused by the prior art, and an object of the present invention is to provide a display device that can prevent erroneous operation of the touch panel.

  In order to solve the above-described problems and achieve the object, the display device according to the present invention stores a correction display value obtained from the display position of the aim displayed on the display unit and the operation position of the touch panel for the aim display. It has correction value storage means and appropriate range determination means for determining whether or not the correction value stored in the correction value storage means is in an appropriate range.

  According to the present invention, the correction value obtained from the display position of the aim displayed on the display unit and the operation position of the touch panel with respect to the aim display is stored, and whether or not the stored correction value is within an appropriate range is determined. Since it is configured to make a determination, correction of touch detection position can be prevented by using correction values that are erroneously written or garbled as they are, and the display position and touch position are shifted so as to hinder the use of the touch panel. As a result, it becomes possible to prevent erroneous operation of the touch panel.

FIG. 1 is a functional block diagram showing the configuration of the ASIC according to this embodiment. FIG. 2 is an explanatory diagram for explaining the difference between the present embodiment and the prior art. FIG. 3 is a diagram illustrating an example of correction data stored in the memory. FIG. 4 is an explanatory diagram for explaining calibration adjustment. FIG. 5 is a diagram illustrating an example of appropriate range data stored in the memory. FIG. 6 is a flowchart illustrating a procedure of touch detection coordinate correction processing according to the present embodiment. FIG. 7 is an explanatory diagram for explaining an application example of the present invention.

  Exemplary embodiments of a display device according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, the case where the present invention is applied to an in-vehicle touch panel display will be described, but the present invention can be similarly applied to cases other than in-vehicle.

  First, the configuration of a display device (for example, ASIC) according to the present embodiment will be described. FIG. 1 is a functional block diagram showing the configuration of the ASIC according to this embodiment.

  As shown in FIG. 1, the ASIC 30 is a microcomputer for touch position detection of the touch panel display 10 formed by bonding the liquid crystal panel 10 </ b> A and the touch panel 10 </ b> B, and detects touch coordinates based on the input from the touch panel display 10. Then, the detected touch detection coordinates are output to the microcomputer 50.

  The microcomputer 50 is an in-vehicle microcomputer connected to various on-vehicle devices (not shown), interprets a command assigned to the coordinate position from touch detection coordinates input by the ASIC 30, and executes the interpreted command. . As commands, various commands relating to navigation, digital television, DVD, front camera, back eye camera, and the like are accepted.

  In this embodiment, the correction value obtained from the display position of the aim displayed on the liquid crystal panel 10A and the operation position of the touch panel 10B with respect to the aim display (hereinafter referred to as the touch position) is stored in the memory 31. A feature is that it is determined whether or not the correction value stored in the memory 31 is within an appropriate range.

  In other words, in the above-described prior art, when the correction value is read from the memory, the correction value is checked by a checksum. However, when the correction value is written to the memory after calibration adjustment, the check is performed in the subsequent reading from the memory. There is a case where an erroneous write that results in a normal sum result occurs.

  Even in such a case, as shown in FIG. 2A, the touch detection coordinates are corrected using the correction values (abnormal values) that are erroneously written or garbled as shown in FIG. It is erroneously detected that the operation is performed at a position unrelated to the operation position.

  Therefore, in this embodiment, as shown in FIG. 2B, when the correction value 32 is read from the memory 31, whether the read correction value 32 is a probable value, that is, whether the correction value is appropriate. By determining whether or not the data content is valid, it is determined not depending on error detection such as a checksum.

  In other words, in this embodiment, the correction value 32 read from the memory 31 is within a predetermined numerical range, for example, an appropriate range of correction values stored in the memory 31 to be described later, or the touch panel 10B is divided into a plurality of areas. Compare with the appropriate range based on the correction value of the area.

  In this embodiment, when the determination result that the correction value 32 read from the memory 31 deviates from the appropriate range is obtained, at least the read value (abnormal value) is not used for correcting the touch detection coordinates. Furthermore, other values than the calibration value of the touch panel 10B, for example, correction values empirically obtained by calibration of a large number of touch panels 10B are used as default values (pseudo correction values) in the memory 31 and the control unit 34. And the default value is input to the touch detection coordinate correction unit 38 to be described later.

  That is, if correction is not performed using an abnormal value at the time of correcting touch detection coordinates, an erroneous operation that hinders use of the touch panel 10B is not caused, and further, correction is performed using another appropriate value. As in the case where correction is performed using the calibration value of the touch panel 10B, a shift between the display position of the liquid crystal panel 10A and the touch position of the touch panel 10B can be corrected.

  Therefore, in the present embodiment, it is possible to prevent the touch detection position from being corrected using correction values that are erroneously written or garbled as they are, and the display position and the touch position are shifted so as to hinder the use of the touch panel 10B. As a result, the erroneous operation of the touch panel 10B can be prevented.

  Next, each component of the ASIC 30 shown in FIG. 1 will be specifically described. As shown in FIG. 1, the ASIC 30 includes a memory 31 composed of a non-volatile memory such as a FLASH memory or an EEPROM, and a control unit 34 composed of an arithmetic device such as a CPU or MPU.

  The memory 31 stores correction data 32 indicating correction values for each of a plurality of areas obtained by dividing the touch panel 10B into a predetermined number, and appropriate range data 33 indicating an appropriate range of correction values for each area.

  In the example shown in FIG. 3A, the touch panel 10B is divided into four parts vertically and horizontally from area 1-1 to area 4-4, and each correction value from area 1-1 to area 4-4 is corrected data. 32 is stored in the memory 31 (see FIG. 3B). Note that, here, the case of dividing into 4 × 4 = 16 areas and equally dividing at the time of division is illustrated, but the present invention can also be applied to an arbitrary number of divisions or unequal divisions. Needless to say.

  This correction value is a value obtained by calibration adjustment that is performed when the product is sent to the manufacturer for repair at the manufacturing stage, the shipping stage, or the use stage. The correction value is a value between the display position of the liquid crystal panel 10A and the touch position of the touch panel 10B. This is to correct the deviation.

  In the calibration adjustment, as shown in FIG. 4A, a design such as a mark to be aimed at each of the areas 1-1 to 4-4 is displayed on the liquid crystal panel 10A, and the aiming display is manually performed. The pressing operation by using or a pressing operation using a dedicated device is accepted.

  For example, as shown in FIG. 4B, the aim display coordinates of the area 2-3 of the liquid crystal panel 10A are (x0, y0), whereas the touch detection coordinates of the area 2-3 of the touch panel 10B are ( In the case of x1, y1), “X” in the horizontal direction and “Y” in the vertical direction between the display position of the area 2-3 of the liquid crystal panel 10A and the touch position of the area 2-3 of the touch panel 10B. It can be seen that

  In such a case, the aim display coordinates (x0, y0) and touch detection coordinates (x1, y1) or correction amounts (X, Y) used for correction performed by the touch detection coordinate correction unit 38 described later are correction values. To the memory 31.

  In this embodiment, the contents of the correction values stored in the memory 31 are other than those described above, for example, the correction amount is processed into a function that can be input using environmental factors such as temperature and applied voltage as parameters. As long as the touch detection coordinates can be corrected, the form is not limited.

  As described above, the reason why the correction value is stored in the memory 31 as the correction data 32 for each area from the area 1-1 to the area 4-4 is that the deviation in bonding between the liquid crystal panel 10A and the touch panel 10B is uniform. This is because the resistance value of the touch panel 10B is not necessarily uniform due to partial deterioration.

  Returning to the description of FIG. 1, the appropriate range data 33 is information including an appropriate range of correction values from the area 1-1 to the area 4-4.

  For example, when the correction value of the area is the touch detection coordinate with respect to the aim display coordinate, as shown in FIG. 5A, the touch reference coordinate (which is the ideal state coordinate pasted on the liquid crystal panel 10A without any deviation). The range of ± 10 in the horizontal direction and the range of ± 10 in the vertical direction is set as the appropriate range 33a, and the appropriate range for each area is held in the memory 31.

  The appropriate range 33 does not need to be limited to the appropriate range 33a described above, and may be a range formed including touch reference coordinates. For example, as shown in FIG. 5B, an appropriate triangular range 33b that allows a large horizontal deviation as the vertical downward deviation increases, or as shown in FIG. 5C, touch reference coordinates. An appropriate range 33c that allows a deviation within a certain distance from the center may be used, and the appropriate ranges 33a to 33c may be changed for each area.

  In addition, the appropriate range 33 may allow the user or the like to specify an arbitrary value for coordinates. In the example shown in FIG. 5D, designation of four coordinate points is accepted, and a range formed by the accepted four coordinate points is held in the memory 31 as an appropriate range 33d. Needless to say, the number of coordinates can be set arbitrarily.

  As described above, the peripheral range of the touch reference coordinates is determined as an appropriate range so that the display position of the liquid crystal panel 10A and the touch position of the touch panel 10B are separated by bonding, but the display position and the touch position are substantially the same. This is because the pasting is performed in most cases, and it is rare that the position is deviated excessively from the touch reference coordinates.

  In the present embodiment, the case where the correction value of the area is the touch detection coordinate with respect to the aiming display coordinate has been described. However, the appropriate range of the correction amount can be similarly held. When setting the appropriate range of the correction amount, it is not necessary to consider the difference in coordinates for each area, so that the appropriate range can be shared and held in the same row, the same column, or all areas.

  The control unit 34 is a control unit that controls the ASIC 30 as a whole, and includes a touch coordinate detection unit 35, an appropriate range determination unit 36, a use correction value selection unit 37, and a touch detection coordinate correction unit 38. Actually, a program corresponding to such a functional unit is stored in a ROM or a non-volatile memory (not shown), and these programs are loaded and executed on the CPU or MPU, and the touch coordinate detection unit 35 and the appropriate range determination unit 36 are executed. The processes corresponding to the use correction value selection unit 37 and the touch detection coordinate correction unit 38 are executed.

  The touch coordinate detection unit 35 is a processing unit that detects coordinates touched (pressed down) on the touch panel 10B based on a signal input from the touch panel 10B. In this touch coordinate detection, various operation principles such as an infrared method and an electromagnetic induction method can be used in addition to the resistance film method and the capacitance method, and the touch panel 10B and the touch coordinate detection are configured according to the operation principle. Any part 35 can be adopted.

  The appropriate range determination unit 36 is a processing unit that determines whether or not the correction value stored as the correction data 32 in the memory 31 is the appropriate range stored as the appropriate range data 33 in the memory 31. Specifically, since touch coordinates are detected by the touch coordinate detection unit 35 in response to a touch operation on the touch panel 10B, a correction value corresponding to the area to which the touch detection coordinates belong is read from the memory 31 and A corresponding appropriate range is read from the memory 31, and it is determined whether or not the read correction value is within the appropriate range.

  The use correction value selection unit 37 is a processing unit that selects a correction value to be used by the touch detection coordinate correction unit 38 based on the determination result by the appropriate range determination unit 36.

  For example, when the appropriate range determination unit 36 determines that the correction value is included in the appropriate range, the use correction value selection unit 37 confirms the correct value, that is, as a correction value without erroneous writing or data garble. Since it has been confirmed that it is appropriate, the touch detection coordinate correction unit 38 is requested to use the correction value as it is.

  On the other hand, if it is determined by the appropriate range determination unit 36 that the correction value is not included in the appropriate range, it is likely that there has been an erroneous writing or data corruption, and the fact that the correction value is not valid has been confirmed. Therefore, the use correction value selection unit 37 requests the touch detection coordinate correction unit 38 to use a default value stored in an arbitrary storage device such as the memory 31, the control unit 34, or an external memory.

  As such default values, pseudo correction values empirically obtained by calibration of a large number of touch panels 10B, for example, an average value of a large number of sample correction values of the touch panel 10B of the same type and the same type, or manifested at a shipping factory of the touch panel display 10 are disclosed. It is possible to set a value that incorporates the tendency of deviation. Although the default value is used here, the touch detection coordinate input to the touch detection coordinate correction unit 38 as the correction amount (0, 0) may be output as it is, or other values described later may be used. It may be used.

  The touch detection coordinate correction unit 38 is a processing unit that corrects the touch detection coordinates detected by the touch coordinate detection unit 35 using the correction value selected by the use correction value selection unit 37. Specifically, when the touch detection coordinate obtained at the time of calibration adjustment is a correction value, the touch detection coordinate at the time of calibration adjustment selected by the use correction value selection unit 37 and the touch reference corresponding to the area. A correction amount (α, β) is calculated from the coordinates (= aiming display coordinates), and the calculated correction amount (α, β) is added to the touch detection coordinates detected by the touch coordinate detection unit 35. When the correction amount calculated at the time of calibration adjustment is a correction value, the correction amount may be added to the touch detection coordinates detected by the touch coordinate detection unit 35 as they are.

  Next, touch detection coordinate correction processing according to the present embodiment will be described. This correction process is started when a touch coordinate is detected by the touch coordinate detection unit 35 in response to a touch operation on the touch panel 10B, for example.

  FIG. 6 is a flowchart illustrating a procedure of touch detection coordinate correction processing according to the present embodiment. As shown in the figure, the appropriate range determination unit 36 reads out a correction value corresponding to the area to which the touch detection coordinates detected by the touch coordinate detection unit 35 belong from the memory 31 and sets the appropriate range corresponding to the area to the memory 31. (Step S601 and step S602), it is determined whether or not the correction value read from the memory 31 is within the appropriate range read from the memory 31 (step S603).

  Here, when the appropriate range determination unit 36 determines that the correction value is included in the appropriate range (Yes in step S603), the use correction value selection unit 37 uses the touch detection coordinates so as to use the correction value as it is. The correction unit 38 is requested (step S604), and the touch detection coordinate correction unit 38 corrects the touch detection coordinates detected by the touch coordinate detection unit 35 using the correction value read from the memory 31 (step S605). The process ends.

  On the other hand, when the appropriate range determination unit 36 determines that the correction value is not included in the appropriate range (No in step S603), the use correction value selection unit 37 selects the memory 31, the control unit 34, an external memory, or the like. The touch detection coordinate correction unit 38 is requested to use the default value stored in the storage device (step S606), and the touch detection coordinate correction unit 38 substitutes the default value for the correction value to detect the touch coordinate detection unit. The touch detection coordinates detected by step 35 are corrected (step S605), and the process ends.

  As described above, according to the present embodiment, the correction value obtained from the display position of the aim displayed on the liquid crystal panel 10A and the touch position of the touch panel 10B with respect to the aim display is stored in the memory 31, and the memory 31 Since it is configured to determine whether or not the correction value stored in 31 is within the proper range, it is possible to prevent correction of the touch detection position using correction values with erroneous writing or garbled data as they are, and the touch panel. As a result, the misalignment between the display position and the touch position is prevented so that the use of the touch panel 10B is hindered. As a result, an erroneous operation of the touch panel 10B can be prevented.

  In the above embodiment, it is determined whether or not the correction value is a probable value using the appropriate range data 33 stored in the memory 31, but information other than the correction data 32 is not necessarily retained. There is no need to keep it.

  For example, in the present invention, among the correction values of a plurality of areas stored as the correction data 32 in the memory 31, the correction value of the area corresponding to the touch detection coordinate detected by the touch coordinate detection unit 35 is between the area. You may make it determine whether it exists in an appropriate range from the average value of the correction value between the areas which satisfy | fill predetermined conditions.

  That is, the misalignment of the bonding between the liquid crystal panel 10A and the touch panel 10B often occurs uniformly in all areas from the area 1-1 to the area 4-4, particularly between the areas belonging to the same column or the same row. In many cases, the same correction amount is shared.

  Therefore, the correction value of the determination target area to which the touch detection coordinates detected by the touch coordinate detection unit 35 belong, the correction value of the area belonging to the same row, and / or the correction value of the area belonging to the same column. Can be regarded as a similar value.

  Furthermore, correction values that deviate excessively from the average value of correction values in the area of the same row including the area to be judged or the average value of correction values in the area of the same column may be erroneously written or garbled. Therefore, it is possible to determine whether the correction value is a probable value using only the correction data 32 without using the appropriate range data 33.

  Specifically, in the appropriate range determination unit 36, only the correction value corresponding to the touch detection coordinates detected by the touch coordinate detection unit 35 in response to the touch operation on the touch panel 10B is read from the memory 31. Rather, the correction value of the area in the same row and / or the same column as the area to which the touch detection coordinate belongs is also read out.

  For example, when the touch detection coordinates detected by the touch coordinate detection unit 35 exist in the area 2-2, the correction value of the area 2-2 is naturally the area 2 as shown in FIG. -2, the correction values of the area 2-1, area 2-3, and area 2-4 in the second row that are the same as -2 are read, and the average value of the correction values of the read areas of the same row is calculated. Further, the correction values of the area 1-2, area 3-2 and area 4-2 in the same second column are read together with the correction value of the area 2-2, and the average value of the read correction values of the areas in the same column is read. Is calculated.

  Then, the appropriate range determination unit 36 determines whether the horizontal component (X coordinate) of the correction value in the area 2-2 is within the appropriate range from the horizontal component of the average value of the areas in the same column, and the area 2 It is determined whether or not the vertical component (Y coordinate) of −2 is within the appropriate range from the vertical component of the average value of the area in the same row. As described with reference to FIG. 5, the appropriate range referred to here is a range of ± 10 in the horizontal direction and ± 10 in the vertical direction (see FIG. 5A) based on the average value. The range described in the above can be arbitrarily used.

  At this time, when both the horizontal component (X coordinate) of the correction value of area 2-2 and the vertical component (Y coordinate) of area 2-2 are within the appropriate range, the use correction value selection unit 37 determines that the same line Therefore, the touch detection coordinate correction unit 38 is requested to use the correction value as it is without being overwritten from the correction value in the same column. .

  On the other hand, when either the horizontal component (X coordinate) of the correction value of area 2-2 or the vertical component (Y coordinate) of area 2-2 is not included in the appropriate range, the use correction value selection unit 37 Since it is confirmed that there is a possibility of erroneous writing or garbled data and is not valid as a correction value, the use correction value selection unit 37 can store any memory such as the memory 31, the control unit 34, or an external memory. The touch detection coordinate correction unit 38 is requested to use the default value stored in the device.

  In this way, it is possible to determine whether or not the correction value is a probable value by using only the correction data 32 without using the appropriate range data 33, and the amount of data to be stored as a preset is reduced. can do.

  In addition, when the appropriate range determination unit 36 determines that either the horizontal component (X coordinate) of the correction value of the area 2-2 or the vertical component (Y coordinate) of the area 2-2 is not included in the appropriate range. Is likely to have been erroneously written or garbled in the correction value of the area 2-2, and is unlikely to be usable thereafter.

  Therefore, as shown in FIG. 7B, the horizontal component of the average value of the areas 1-2, 3-2, and 4-2 in the same column excluding the area 2-2 is the horizontal component of the correction value. The vertical component of the average value of the area 2-1, area 2-3, and area 2-4 on the same line excluding the area 2-2 is used as the vertical component of the correction value, and the cache memory 39 in the control unit 34 or a register or external It can also be held in a storage device such as a memory as a substitute correction value for area 2-2, and can be substituted when reading the correction value for area 2-2 thereafter. In this case, it is preferable to use only the correction value of the area determined to be within the appropriate range from the average value as the substitute correction value.

  Furthermore, in the present invention, the correction value held in the control unit 34, that is, the correction value that has already been confirmed to be a probable value is used as a comparison target, and the correction value of an area that is subsequently determined is probable. Whether it is a value or not can be determined.

  That is, since most cases occur uniformly in all areas from area 1-1 to area 4-4, is it within the appropriate range from the correction value held in the control unit 34 or the average value of a plurality of correction values? By determining whether or not, the access speed to the comparison target can be improved. In this case, it is preferable that the correction value of the area highly related to the area to be determined, for example, the correction value of the area in the same row, the area in the same column, the adjacent area, or the like is used as the comparison target.

  Here, the horizontal component of the average value in the area of the same row is set as the comparison target, and the vertical component of the average value of the area in the same row is set as the comparison target. The horizontal and vertical components of the average value in either the same column or the same row area may be compared, and adjacent areas (in this example, not all areas in the same column or same row) may be compared. , Area 1-2, area 2-1, area 2-3, area 3-2, or a combination thereof) may be used for comparison.

  In the present invention, it is also possible to determine whether or not the correction values of one or a plurality of areas are probable values using the correction values of all areas. For example, the average value of the correction values of all the areas 1-1 to 4-4 is calculated, and the correction value of the area within the appropriate range from the horizontal component and the vertical component of the average value of all the areas is determined as the normal value. On the other hand, the correction value of the area that is not within the appropriate range from the horizontal component and the vertical component of the average value of all the areas is determined as an abnormal value.

  As a result, it is possible to determine whether the correction value is included in the appropriate range using the average value in the presence of samples in a large number of areas, and to determine whether the correction value is a probable value. Can be performed more accurately.

  In the above-described embodiment, each time the touch coordinates are detected by the touch coordinate detection unit 35 in response to a touch operation on the touch panel 10B, the touch detection coordinates detected by the touch coordinate detection unit 35 belong to the area to which the touch detection coordinates belong. Although it was decided to determine whether or not the correction value is in the appropriate range, it is not always necessary to determine whether or not the correction value is included in the appropriate range in response to a touch operation. Whether it is included in the appropriate range at the timing can be determined.

  For example, it is determined whether or not the correction values of all the areas 1-1 to 4-4 are within an appropriate range when the touch panel display 10 is activated, or all the areas 1-1 to 1 are activated when the touch panel display 10 is first activated. It is possible to determine whether or not the correction value 4-4 is in the proper range, and thereafter, the determination of whether or not the correction value is in the proper range can be omitted.

  That is, if a correction value without erroneous writing or data corruption can be read once, it can be determined that there is no flaw in writing at the time of calibration adjustment. As a result, in subsequent readings, it is clear that abnormal values are read due to data corruption due to noise etc. during reading, and errors during this reading can be detected by checksum etc. The determination of the appropriate range by the determination unit 36 and the use correction value selection by the use correction value selection unit 37 can be made unnecessary.

  At this time, for correction value areas not included in the appropriate range, the default value is used as a substitute correction value, or the horizontal component of the average value of the area in the same column and the vertical component of the average value of the area in the same row are used as substitute correction values. Alternatively, an average value of adjacent areas may be used as a substitute correction value, and if the substitute correction value is registered in the control unit 34 or in an external memory, only an area that is not erroneously written or garbled during calibration adjustment. Instead, a reasonable correction value can be used for all areas.

  Further, in the present invention, in order to accurately determine whether or not there is a flaw in writing at the time of calibration adjustment, the correction value of the same area is repeatedly read from the memory 31 a predetermined number of times, and the correction value read repeatedly It is determined whether or not each is in the proper range, and if it is determined that the correction value is in the proper range even once, the correction value in the area should be free from writing during calibration adjustment. It is possible to determine more reliably.

  In the present invention, when the appropriate range determination unit 36 determines that the correction value is not included in the appropriate range, an abnormal value, an area having an abnormality, an appropriate range compared with the abnormal value, a display for prompting calibration adjustment, and the like are displayed. It can be displayed on the touch panel display 10 and other display units, or can be output as audio by other audio output units.

  In the above-described embodiment, the correction data 32 and the appropriate range data 33 are stored in the memory 31. However, the correction data 32 and the appropriate range data 33 may be stored in a storage device such as a cache memory or a register in the control unit 34. It is good also as making it hold in the external memory which does not.

  In the above embodiment, the correction data 32 and the appropriate range data 33 are stored in the memory 31 in advance. However, the correction data 32 and the appropriate range data 33 are acquired from the microcomputer 50 and stored in the memory 31. It doesn't matter if you keep it.

  As described above, the display device according to the present invention is suitable for preventing erroneous operation of the touch panel.

10A LCD panel 10B Touch panel 30 ASIC
31 Memory 32 Correction Data 33 Appropriate Range Data 34 Control Unit 35 Touch Coordinate Detection Unit 36 Appropriate Range Determination Unit 37 Use Correction Value Selection Unit 38 Touch Detection Coordinate Correction Unit 50 Microcomputer

Claims (2)

For each of the plurality of divided display unit area, and the correction value storing means for storing the correction value obtained from said display unit to display display position of the aiming and the operating position of the touch panel with respect to the sight display,
Among the correction values of the plurality of areas stored in the correction value storage means, the correction value of the area to be determined satisfies the predetermined value with respect to the area or the average value of the correction values between the areas or all the areas. And a proper range determining means for determining whether or not the average value of the correction values is within the proper range. When it is determined by the appropriate range determination means that the correction value of the area to be determined is not within the appropriate range, the correction value of the area within the appropriate range from the average value among the correction values of other areas of the display device according to claim 1, characterized in that further have a correction value holding means for holding the correction value.

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