JP2011112888A - Display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce unevenness of light emission due to burning, even when image information constituted with a plurality of kinds of display colors is fixed and displayed. <P>SOLUTION: In a display device 1 for a vehicle which includes a self-luminous indicator 15, including a display screen 15a constituted of a plurality of pixels; a display control means P1 that makes image information display on the self-luminous indicator 15, making a display pattern which is constituted with the plurality of kinds of display colors display on the display screen 15a; a display time measuring means P2 that measures the display period of the self-luminous indicator 15; and a degradation amount estimation means P3 for estimating the degradation amount of the plurality of pixels constituting the display screen 15a, based on a display pattern indicated by the measured display period and the display information displayed on the display screen 15a by the display control means P1; and a correction means P4, that corrects respective brightness of the plurality of pixels so that the plurality of pixels becomes identical in brightness, based on the degradation amount estimated by the degradation amount estimation means P3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a self-luminous display having a display screen, a first display unit for fixed display of a desired display pattern, and a lower luminance than the first display unit formed in a region different from the first display unit. The present invention relates to a display device for a vehicle having display control means for displaying image information having a second display section on a display screen of the self-luminous display.

  In general, a display device for a vehicle provided in a passenger compartment of a vehicle is provided in an instrument panel in front of the driver's seat so that a driver seated in the driver's seat can visually recognize the display of each instrument device via the steering wheel. Has been placed. This vehicular display device has a plurality of display areas indicating the traveling speed of the vehicle, the number of revolutions of the engine per unit time, the remaining amount of fuel in the fuel tank, the temperature of engine coolant, and the like. . These display areas are arranged efficiently in the same case so that the driver can understand the vehicle state at a glance.

  The vehicle display device includes a self-luminous display such as an organic EL (Electro Luminescence) element, an inorganic EL element, a fluorescent display tube (VFD), a field discharge display (FED), and the like. Some display devices display a display pattern such as a speedometer or a tachometer. In such a self-luminous display, as disclosed in Patent Document 1 and the like, the light emission characteristics of the light emitting element deteriorate with the lapse of the light emission time, and the luminance obtained by the same input current decreases. Therefore, when an icon is always displayed at a certain position on the screen, when a certain pixel has a high emission luminance, a problem of “burn-in” occurs in which the emission characteristics of these pixels are significantly deteriorated compared to other pixels. It is known to do.

  In the matrix drive type display shown in Patent Document 1, input data for each pixel is integrated for each pixel at a fixed period in a state where the display panel is driven, and the integrated value for all the pixels in a non-use state thereafter. Describes a technical idea of generating correction data for aligning the pixels with the same value and causing each pixel to emit light based on the correction data.

JP 2003-228329 A

  However, in the display shown in Patent Document 1, since it is necessary to monitor each pixel based on input data, a circuit or the like for monitoring the input signal to the light emitting element and storing the accumulation is necessary. Measures were necessary. Therefore, when the light emitting element to be used is changed, the correction method, the circuit configuration, and the like must be changed, which is not versatile. In particular, when the image information to be fixedly displayed is a plurality of types of display colors (gradation), it is necessary to monitor each input data, and there is a problem that the correction method and the hardware configuration become complicated.

  Therefore, in view of the above-described problems, the present invention has an object to provide a vehicle display device that can reduce variations in light emission due to image burn-in even when image information composed of a plurality of types of display colors is fixedly displayed. Yes.

  In order to solve the above problems, the vehicle display device according to claim 1, which is made according to the present invention, has a self-luminous display 15 having a display screen 15 a composed of a plurality of pixels, as shown in the basic configuration diagram of FIG. 1, In the vehicle display device 1 having display control means P1 for displaying image information indicating a display pattern composed of a plurality of types of display colors on the display screen 15a of the self-light-emitting display 15, the self-light-emitting display 15 The display time measuring means P2 for measuring the display time, the display time measured by the display time measuring means P2, and the display pattern indicated by the image information displayed on the display screen 15a by the display control means P1. Deterioration amount estimation means P3 for estimating the deterioration amounts of a plurality of pixels constituting the display screen 15a, and the plurality of images based on the deterioration amounts estimated by the deterioration amount estimation means P3. There characterized by having a correction means P4 for correcting each of the luminance of the plurality of pixels so that the same luminance.

  According to the vehicle display device of the present invention described in claim 1, when image information or the like is displayed on the self-luminous display 15 by the display control means P1, the display time measuring means P2 displays the self-luminous display 15 on the display. Display time is measured. Then, the deterioration amount estimation means P3 estimates the deterioration amounts of the plurality of pixels constituting the display screen based on the display time and the display pattern of the image information, so that the brightness of each of the plurality of pixels becomes the same brightness. In addition, the adjusting means P4 corrects the estimated deterioration amount.

  According to the second aspect of the present invention, as shown in the basic configuration diagram of FIG. 1, each of the plurality of pixels has the same luminance based on each display color of the display pattern indicated by the image information and the amount of deterioration. The transmission image information creating means P5 for creating the transmission image information that transmits the image information, and the correction means P4 halves the transmission image information created by the transmission image information creation means and the image information. It is a means for correcting the luminance of each of the plurality of pixels by performing transparent composition.

  According to the vehicle display device of the present invention described in the second aspect, when the transmission image information based on the display color and the deterioration amount of the image information is generated by the transmission image information generation unit P5, the correction unit P4 The transmission image information is semitransparently combined, and the brightness of each of the plurality of pixels in the self-luminous display is corrected.

  According to a third aspect of the present invention, as shown in the basic configuration diagram of FIG. 1, in the vehicle display device according to the second aspect, the correction means P4 differs from the image information G1 by the display control means P1. Means for correcting the brightness of each of the plurality of pixels by translucently combining the second image information G2 and the transmissive image information when switching the display content of the self-luminous display 15 to the second image information G2. It is characterized by being.

  According to the vehicle display device of the present invention described in claim 3, when the display content of the self-luminous display 15 is switched from the image information G1 to the second image information G2, the second image information is displayed by the display control means P1. G2 and transmission image information are translucently combined and displayed on the self-luminous display 15.

  According to a fourth aspect of the present invention, as shown in the basic configuration diagram of FIG. 1, in the vehicle display device according to any one of the first to third aspects, a temperature at which the temperature of the self-luminous display 15 is measured. A measuring unit 18, and the deterioration amount estimating unit P3 corrects the display time from the relationship between the temperature measured by the temperature measuring unit 18 and the lifetime of the self-luminous display 15, and the corrected display time It is a means for estimating a deterioration amount of the self-luminous display based on the display pattern.

  According to the vehicle display device of the present invention described in claim 4, when the temperature of the self-luminous display 15 is measured by the temperature measuring means 18, the measured temperature and the lifetime of the self-luminous display 15 are calculated. From the relationship, the actually measured display time is corrected. The relationship between the temperature and the lifetime of the self-luminous display 15 has been found to be longer when the temperature is used at a low temperature than when the temperature is used at a high temperature. Correct the display time so that Then, the luminance deterioration amount of the self-luminous display 15 based on the corrected display time and display pattern is estimated by the deterioration amount estimating means P3.

  As described above, according to the vehicle display device of the present invention described in claim 1, the deterioration of the plurality of pixels constituting the display screen based on the display time of the self-luminous display and the display pattern of the image information. Since the amount is estimated and corrected based on the estimated amount of deterioration so that each pixel has the same luminance, it is displayed on the display screen of the self-luminous display due to aging, etc. Even if variations in luminance deterioration (brightness spots) occur between pixels of different colors, the entire display screen can be displayed with the same luminance. Accordingly, since it is not necessary to monitor each pixel of the self-luminous display using dedicated hardware or the like, it is possible to reduce variations in luminance due to burn-in without complicating the device configuration. Further, since the device configuration is not complicated, the cost of the device can be prevented from increasing, which can contribute to the spread of low-priced vehicles and the like. Furthermore, even if the brightness of the self-luminous display is deteriorated during a guarantee period (for example, 10 years) required for a vehicle equipped with a vehicle display device, it is possible to reduce the occurrence of brightness spots on the display screen.

  According to the vehicle display device of the present invention described in claim 2, in addition to the effect of the invention of claim 1, transmission image information based on the display color of the image information and the predicted deterioration amount of each pixel is obtained. The self-luminous display deteriorated due to the semi-transparent composition of the image information since the transmission image information and the image information are translucently synthesized to correct the brightness of each of the plurality of pixels in the self-luminous display. For example, it is possible to correct the brightness of the image by using a function of a graphic controller or the like, so that the apparatus can be prevented from becoming complicated and the existing function can be effectively used to reduce the cost. it can.

  According to the vehicle display device of the present invention described in claim 3, in addition to the effect of the invention described in claim 2, when the display content of the self-luminous display is switched from the image information to the second image information, Since the second image information and the transmission image information for correcting pixel degradation are translucently combined and displayed on the self-luminous display, the luminance corresponding to the image information on the display screen of the self-luminous display Even if spots occur, an area where deterioration is delayed based on transmission image information can be used as the adjustment brightness. Therefore, even if the display content of the self-luminous display is switched to the second image information, the display screen is burned. This makes it possible to make the variation in the light emission inconspicuous.

  According to the vehicle display device of the present invention as set forth in claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the display time of the self-luminous display is suitable for the temperature. Since the amount of deterioration of a plurality of pixels constituting the display screen is estimated on the basis of the corrected display time and the display pattern of the image information, the more accurate self-luminous display Since the amount of deterioration can be estimated, the entire display screen can be displayed with the same luminance without being affected by the use environment of the self-luminous display.

It is a block diagram which shows the basic composition of the display apparatus for vehicles of this invention. It is a block diagram which shows schematic structure of the display apparatus for vehicles to this invention. It is a figure which shows the example of a display of the image information of this invention. It is a figure which shows the example of a display of 2nd image information. It is a graph which shows the relationship between the brightness | luminance and display time in a self-light-emitting display. It is a graph which shows the relationship between the brightness | luminance in a self-light-emitting display, and a gradation. It is a graph which shows the relationship between the gradation and alpha value in a self-light-emitting display. It is a graph which shows the relationship between the alpha value and display time in a self-light-emitting display. It is a graph which shows the relationship between the alpha value with respect to each display color, and display time, (a) shows the display color black, (b) shows the display color gray, (c) shows the display color white. It is a flowchart which shows an example of the luminance adjustment process which concerns on this invention which CPU of FIG. 2 performs. It is a graph which shows the relationship between each brightness | luminance and display time of the 1st display area in a display screen, a 2nd display area, and a 3rd display area.

  Hereinafter, an embodiment of a display device for a vehicle according to the present invention will be described with reference to the drawings of FIGS.

  In FIG. 2, the vehicle display device 1 is incorporated in a vehicle as a graphic meter or the like, for example. The vehicular display device 1 includes a central processing unit (CPU) 11 that performs various processes and controls according to a predetermined program, a ROM 12 that is a read-only memory storing a program for the CPU 11, and the like. A RAM 13 that is a readable / writable memory that stores data and has an area necessary for processing operations of the CPU 11, a graphics controller (GC) 14, a self-luminous display (also referred to as a display) 15, A VRAM (Video Random Access Memory) 16, an EEPROM (electrically erasable programmable read-only memory) 17, and a temperature sensor 18 are included.

  In the CPU 11, a ROM 12, a RAM 13, a GC 14, and a temperature sensor 18 are electrically connected to each other. The CPU 11 is communicably connected to a vehicle-mounted LAN of the vehicle on which the vehicle display device 10 is mounted via a communication device (not shown). The display 14 and the VRAM 16 are connected to the GC 14 via a bus 18 so that various data can be input and output.

  The ROM 12 stores a program for controlling the entire processing in the vehicle display device 1, and the CPU 11 executes the program to output a display request for a desired display image to the GC 14. 15 displays are controlled. That is, the ROM 12 stores various programs for causing the CPU 11 to function as various means such as the display time measuring means P2 and the deterioration amount estimating means P3 in the claims shown in FIG.

  Upon receiving a display request from the CPU 11, the GC 14 causes the display 15 to draw the first image information G1 shown in FIG. 3 and the second image information G2 shown in FIG. 4 based on various information (data) in the VRAM 16. Thus, the first image information G1 and the second image information G2 are switched and displayed on the display 15. In this embodiment, the case where the GC 14 functions as the display control means P1 and the correction means P4 in the claims shown in FIG. 1 will be described. However, the CPU 11 functions as the display control means P1 and the GC 14 functions only as the correction means P4. Various embodiments such as an embodiment and an embodiment in which both the display control unit P1 and the correction unit P4 are caused to function by the CPU 11 can be used.

  The display 15 has a display screen 15a on which various image information shown in FIGS. 3 and 4 are displayed, and the display screen 15a is provided on the instrument panel of the vehicle so as to be visible from the driver. The display device 15 functions as a known meter by displaying the first image information G1 shown in FIG. 3 on the display screen 15a at the normal time. The display unit 15 is configured to be capable of dot matrix display that can turn on / off display units (pixels) arranged in a vertical and horizontal matrix and draw characters and figures on the display screen 15a. A display device such as an EL (Electro Luminescence) element is arbitrarily used. The display 15 is configured to turn on / off each pixel under the control of the GC 14 to switch the first image information G1, the second image information G2, and the like to the display screen 15a.

  As is well known, the VRAM 16 shown in FIG. 2 is a memory that retains and stores the contents displayed on the display unit 15, and includes the first image information G1 and the second image information G2 described above, and the transmission image. Various information such as information is stored. Then, the CPU 11 accesses the VRAM 16 via the GC 14.

  As shown in FIG. 3, the first image information G1 is information for displaying a speedometer that is a desired display pattern. The first image information G1 is a first display portion G11 that displays a plurality of scales arranged in an arc shape, and a number corresponding to the scale of the first display portion G11 is displayed in a display color different from the scale. 2 display part G12, 3rd display part G13 equivalent to the background of 1st display part G11 and 2nd display part G12, and it is rotated to the indication position of the index according to the amount of measurement (vehicle speed etc.). And an instruction unit G14 displayed on the screen. In this embodiment, the case where a desired display pattern is a design pattern of a speedometer will be described. However, the present invention is not limited to this, and the display form of the embodiment such as a tachometer, a fuel gauge, and the like is used. It is determined arbitrarily.

  The first display unit G11 is a region for displaying with a desired high luminance. The second display portion G12 is a region that displays with lower luminance than the first display portion G11. The third display part G13 is a lower display area than the first display part G11 and the second display part G12 or a non-display area, that is, the background of the display pattern, for example, black, dark gray, amber, etc. The dark color system has a lower luminance than the above index. The instruction unit G14 corresponds to a known pointer such as a speedometer, and a predetermined rotation range is updated in accordance with a change in the measurement amount, and the first display unit starts from the center of the first image information G1. Displayed in a substantially straight line toward G11. Note that the third display unit G13 may have a plurality of display colors such as a background color corresponding to a dangerous range such as a scale as a warning color.

  When the first image information G1 is displayed on the display screen 15a of the display device 15, the portion displaying the first display portion G11 is the first display region 15b, and the portion displaying the second display portion G12 is the second display region 15c. A portion for displaying the third display portion G13 is a third display region 15d. The display 15 controls the display of the corresponding pixel elements (pixels) in the first display area 15b, the second display area 15c, and the third display area 15d.

  The second image information G2 is an image that can be switched at a switching request from a user or at a predetermined switching timing from the first display unit G1 that is normally displayed on the display unit 15. That is, the second screen information G2 is displayed in the same area as the first screen information G1 on the display screen 15a of the display 15. As shown in FIG. 4, the second image information G2 is image information indicating a menu screen for selecting “NAVI (navigation)”, “AUDIO”, and “A / C (air conditioner)”.

  The transmission image information indicates a region (display pattern) of the display screen 15a in which the luminance deterioration is delayed due to secular change or the like, and the portions corresponding to the second display unit G12 and the third display unit G13 are different from the adjusted luminance. The mask image is transmitted so as to be. The transmission image information can specify a portion that is desired to be transmitted, that is, an image that defines a background portion of the first display portion G11 corresponding to a display pattern such as a speedometer, and an image that defines a portion of the second display portion G12. This information is used for the alpha blend (α blend) function of the GC 14.

  As is well known, alpha blending is a function of translucently combining two images using a coefficient (alpha value). The alpha value means the transparency information set for each pixel (point) in the digital image data handled by the computer, and is completely transparent (colorless) to incompletely opaque (not passing the background color at all). ) Can be set. When the computer handles an image, the color information includes information on the three primary colors R (red), G (green), and B (blue) for each pixel, and the color is expressed by a combination thereof (CMYK). 4 colors for mode). When expressing the transparency of a pixel, an alpha value is added to it, and one pixel is displayed by combining four pieces of information.

  Therefore, in this embodiment, it is set as the structure which can specify the 2nd display area 15c and the 3rd display area 15d of the display screen 15a corresponding to the 2nd display part G12 and the 3rd display part G13 with transparent image information, A case will be described in which an alpha value is calculated based on the luminance deterioration of each of the display areas 15c and d, and the transmittance for each pixel in the display area is defined based on the alpha value. Then, when two alpha values are input from the CPU 11 to the GC 14, the transmission image information in which the portion corresponding to the second display portion G12 becomes the second alpha value and the portion corresponding to the third display portion G13 becomes the third alpha value. Is created or extracted and stored in the VRAM 16, and the transparent image information and the first image information G1 of the VRAM 16 are alpha blended and displayed on the display 15. Accordingly, the display 15 displays the first image information G1 in which the luminance of the entire screen of the first display unit G11, the second display unit G12, and the third display unit G13 is uniformly adjusted. Further, when the GC 14 receives a switching request from the CPU 11, the GC 14 alpha-blends the second image information G 2 and the transmission image information in the VRAM 16 and causes the display 15 to display them.

  The temperature sensor 18 has a sensor element provided in the display 15. The sensor element outputs a temperature signal corresponding to the temperature of the installation location to the CPU 11. The CPU 11 is configured to detect the temperature of the display 15 based on the temperature signal from the temperature sensor 18 and use the temperature for the deterioration determination (estimation) of the display 15 or the like. In addition, when not using temperature for determination of brightness | luminance degradation, it can also delete from the structure of the display apparatus 1 for vehicles.

  Next, an example of a method for deriving the relationship between the display time of the display unit 15 and the alpha value will be described below with reference to the drawings of FIGS. The gamma characteristic will be described on the assumption that it is set to 1.0.

  First, as shown in FIG. 5, the relationship between the display time and the luminance drop (deterioration) for the display 15 used in the vehicle display device 1 is derived from the results of actual measurement or simulation. In this way, the luminance degradation characteristic specific to the display 15 is derived. In FIG. 5, the vertical axis represents luminance, and the horizontal axis represents display time.

  On the display screen 15a of the display 15, the relationship between the brightness and the gradation shown in FIG. 6 and the relation between the gradation and the alpha value shown in FIG. Derived from the results of 6 and 7, the upper limit of the gradation and the alpha value is 100%. Note that the characteristics of the graphs of FIGS. 6 and 7 change depending on the gamma characteristics.

  Based on the graphs of FIGS. 5 to 7, the relationship between the display time and the alpha value is derived. Then, based on the graph showing the relationship between the display time and the alpha value shown in FIG. 8, the alpha value information such as the alpha value table, the alpha value calculation formula, etc. is converted from the display time to the second alpha value, the third alpha described above. It is created corresponding to the value and stored in advance in the VRAM 16. Thereby, by measuring the display time of the display 15, the second display unit G12 and the third display unit G13 corresponding to the luminance deterioration of the first display unit G11 based on the display time and the alpha value information. It is possible to obtain an alpha value for specifying each adjustment luminance.

  Next, an example of the alpha value and display time corresponding to each display color will be described. First, when the display color shown in FIG. 9A is black, the display color shown in FIG. 9B is gray, and the display color shown in FIG. 9C is white. When the display color is white, it is not necessary to reduce the alpha value almost even after the display time has elapsed. On the other hand, when the display color is black, it is necessary to gradually reduce the alpha value as the display time elapses. Further, when the display color is gray, although not as much as black, it is necessary to gradually decrease the alpha value as the display time elapses. Considering such a relationship, a table corresponding to the display color, a calculation program, and the like are stored in the VRAM 16 in advance.

  Regarding the adjusted luminance, various embodiments such as estimating the luminance degradation from the display time and specifying the alpha value, the adjusted luminance, etc. based on the estimated luminance degradation and a predetermined table, calculation formula, etc. It can be.

  Next, the CPU 11 described above executes a display time measurement processing program stored in advance in the ROM 12 and functions as the display time measurement means P2 in the claims shown in FIG. Is displayed and the display time indicating the display time, the counter value, etc. is periodically stored in the EEPROM 17.

  Next, an example of the brightness adjustment processing according to the present invention executed by the CPU 11 of the vehicle display device 1 described above will be described below with reference to the flowchart shown in FIG. Note that this brightness adjustment processing is premised on being called from the upper module when the system of the vehicle display device 1 is activated, for example.

  When the system of the vehicle display device 1 is activated and the luminance adjustment processing program is executed by the CPU 11, the display time is acquired from the EEPROM 17 and stored in the RAM 13 in step S11 shown in FIG. 10, and then the process proceeds to step S12.

  In step S12, a cumulative deterioration amount corresponding to each of the cumulative deterioration amounts of the plurality of pixels is estimated for each display area from the display time of the RAM 13, and an alpha value is calculated from the cumulative deterioration amount and stored in the VRAM 16, Thereafter, the process proceeds to step S13. By this processing, based on the display time and the accumulated deterioration amount, the second display unit G12 and the third display unit G13 in which the first display unit G11, the second display unit G12, and the third display unit G13 have the same brightness. The second alpha value and the third alpha value are specified (calculated) and stored in the VRAM 16. In the present embodiment, since the alpha value information is prepared in advance so that the alpha value can be specified from the display time, the process is simplified by using the alpha value information.

  In step S13, alpha value information indicating the second alpha value, the third alpha value, and the like is output to the GC 14, whereby the alpha value information is stored in the VRAM 16, and control based on the alpha value information of the GC 14 is performed. As a result, the display 15 is displayed, and then the process proceeds to step S14. Note that since the luminance deterioration proceeds slowly, the alpha value information may be output to the GC 14 once at the time of system startup, but the alpha value information can be output to the GC 14 at an arbitrary timing.

  In step S14, it is determined whether a system down request has been received. If it is determined that the system down request has not been received (N in S14), it is determined in step S15 whether or not a predetermined time has elapsed. The predetermined time is a predetermined sampling time. In the present embodiment, the predetermined time is determined using a clock function, a timer function, or the like that the CPU 11 has. If it is determined that the predetermined time has not elapsed (N in S15), the process returns to step S14, and a series of processes is repeated. On the other hand, if it is determined that the predetermined time has elapsed (Y in S15), the process proceeds to step S16.

  In step S16, it is determined whether or not the first image information G1 is being displayed based on whether or not the first image information G1 is being displayed on the display 15. When it is determined that the first image information G1 is not being displayed (N in S16), the process returns to step S14, and a series of processes is repeated. On the other hand, if it is determined that the first image information G1 is being displayed (Y in S16), the display time in the RAM 13 is counted up by a predetermined time in step S17, and then the process returns to step S14.

  On the other hand, if it is determined in step S14 that a system down request has been received (Y in S14), the display time of the RAM 13 is stored and saved (stored) in the EEPROM 17 in step S18, and then the process ends. By storing the display time in the EEPROM 17 in this way, it is not necessary to store the deterioration amount for each display unit, so that the processing can be simplified and the capacity of the storage area can be reduced.

  As is apparent from the above description, in the present best mode, the CPU 11 executes the above-described brightness adjustment processing program, so that the display time measuring means P2 and the deterioration amount estimating means P3 in the claims shown in FIG. Will work.

  Next, an example of the operation (action) of the vehicular display device 1 according to the present invention will be described below with reference to the drawings of FIGS.

  As shown in FIG. 3, the vehicle display device 1 displays the first image information G1 on the display screen 15a of the display unit 15 when the system is activated in response to turning on the ignition switch of the vehicle. On the display screen 15a, the first display portion G11 corresponding to the design pattern of the speedometer is fixedly displayed with high luminance, and the second display portion G12 corresponding to the background is in a non-display state such as black. Thereby, in the display device 15, the first display area 15b corresponding to the first display section G11 is deteriorated due to secular change or the like, whereas the second display area 15c corresponding to the second display section G12 is the first display area 15c. Since the luminance is lower than that of the display area 15b, the progress of deterioration is delayed, and further, the third display area 15d corresponding to the third display unit G13 is delayed more than the second display area 15c. The difference between the deteriorations gradually increases as the display time elapses, and luminance spots are generated between the display areas depending on the size.

  Further, when the vehicle display device 1 samples the speed signal at a predetermined sampling interval and measures the speed (measurement amount) of the vehicle, the vehicular display device 1 sets the instruction unit G14 to indicate the design pattern corresponding to the speed. Displayed on the display unit G13. That is, the tip of the instruction part G14 is moved and displayed on the third display part G13 according to the measurement amount so as to follow the design pattern. Therefore, since the instruction unit G14 moves according to the measurement amount, the deterioration of the pixel elements corresponding to the movement range of the instruction unit G14 in the third display unit G13 of the display unit 15 is also delayed.

  When the display 15 of the vehicle display device 1 always displays the first image information G1, as shown in FIG. 10, the first display area 15b deteriorates as shown in the graph L1 according to the display time, and the second display information 15 It can be seen that the display area 15c deteriorates so as to follow the graph L1 like the graph L2, and the third display area 15d hardly deteriorates as shown in the graph L3. In FIG. 10, the vertical axis represents luminance, and the horizontal axis represents display time. Therefore, the brightness variation can be eliminated by adjusting the brightness so that the second display area 15c and the third display area 15d are matched with the most deteriorated first display area 15b.

  Therefore, the vehicular display device 1 measures the display time of the display 15 and, for example, at the time of system activation, at an arbitrary timing, etc., the first display area 15b and the second display area 15c according to the display time. Corresponding to the second display area 15c is obtained by determining the cumulative deterioration amount indicating the luminance deterioration of each of the first display area, specifying each alpha value (correction amount) of the second display area 15c and the third display area 15d corresponding to the cumulative deterioration quantity. The transmission image information in which the portion to be processed has the second alpha value and the portion corresponding to the third display region 15d has the third alpha value is created, and the transmission image information and the first image information G1 are alpha blended to the display unit 15. Display.

  As a result, on the display screen 15a, the transmittance of the first display region 15b that has deteriorated is 100%, that is, alpha blending is not performed, and the transmittance of the second display region 15c that has been delayed in deterioration is The luminance is adjusted in accordance with the advanced first display area 15b, for example, 95%, and the transmittance of the third display area 15d in which the deterioration is further delayed is the luminance in accordance with the first display area 15b in which the deterioration is advanced. Adjustment is made, for example 80%. As described above, in the present invention, since each alpha value is specified by software according to the characteristics of the display screen 15a, it is not necessary to provide a dedicated circuit or the like.

  In addition, the vehicle display device 1 can be used by a driver or the like via an in-vehicle LAN in a state where luminance variation occurs in the first display area 15b, the second display area 15c, and the third display area 15d of the display screen 15a. When the display of the second image information G2 is requested, the second image information G2 in the VRAM 16 and the transparent image information corresponding to the latest alpha value described above are alpha blended and displayed on the display unit 15. Thereby, since the indicator 15 is adjusting the brightness | luminance of the whole screen of the 1st display part G11, the 2nd display part G12, and the 3rd display part G13 uniformly, 2nd image information G2 displayed on the display screen 15a. The brightness variation due to image sticking becomes inconspicuous.

  According to the vehicle display device 1 described above, based on the display time of the self-luminous display 15 and the display pattern of image information, the amount of deterioration of the plurality of pixels constituting the display screen 15a is estimated, and the plurality of pixels Since the luminance is corrected based on the estimated deterioration amount so that the respective luminances are the same luminance, the display color of the display screen 15a of the self-luminous display 15 is different from that of a pixel having a different display color due to secular change or the like. Even if variations in luminance (brightness spots) occur in the meantime, the entire display screen 15a can be displayed with the same luminance. Therefore, since it is not necessary to monitor each pixel of the self-luminous display 15 using dedicated hardware or the like, it is possible to reduce variations in luminance due to burn-in without complicating the device configuration. Further, since the device configuration is not complicated, the cost of the device can be prevented from increasing, which can contribute to the spread of low-priced vehicles and the like. Furthermore, even if the luminance of the self-luminous display is deteriorated during a guarantee period (for example, 10 years) required for a vehicle equipped with the vehicle display device 1, the occurrence of luminance spots on the display screen can be reduced. .

  Moreover, according to the display device 1 for vehicles, the transmission image information based on the display color of the first image information G1 and the predicted deterioration amount of each pixel is created, and the transmission image information and the first image information G1 are obtained. Since the luminance of each of the plurality of pixels in the self-luminous display 15 is corrected by translucent composition, the pixels of the self-luminous display 15 deteriorated by the translucent composition of the first image information G1 are corrected. For example, since brightness adjustment can be performed using a function such as a graphic controller, the apparatus can be prevented from becoming complicated and cost can be reduced by effectively using existing functions.

  Further, according to the vehicle display device 1, when the display content of the self-luminous display 15 is switched from the first image information G1 to the second image information G2, the second image information G2 and the first image information G1 are supported. Since the transmitted transmission image information is semitransparently synthesized and displayed on the self-luminous display 15, the first display area 15b, the second display area 15c, and the third display on the display screen 15a of the self-luminous display 15 are displayed. Even if a luminance unevenness occurs between the region 15d and the second display region 15c and the third display region 15d whose deterioration has been delayed based on the transmission image information can be set as the adjustment luminance, the self-luminous display Even if the display content of 15 is switched to the second image information G2, the variation in light emission due to the burn-in of the display screen 15a can be made inconspicuous.

  In addition, in this embodiment mentioned above, although the case where the display apparatus 1 for vehicles switched and displayed the 1st image information G1 and the 2nd image information G2 was demonstrated, for example, three or more image information is switched and displayed. In this case, it is possible to set the display area of the display screen 15a based on each display time of each image information and specify and adjust the adjustment luminance.

  In the above-described embodiment, the first display unit G11 corresponding to the scale of the first image information G1 is displayed with a higher gradation (display color) than the second display unit G12 corresponding to numbers and units. As described above, the second display part G12 can be displayed as a higher gradation than the first display part G11. When there are four or more different gradations, it is possible to estimate the deterioration amount for each gradation and specify an alpha value corresponding to the deterioration amount.

  Furthermore, in the above-described embodiment, the case where the CPU 11 executes the brightness adjustment process illustrated in FIG. 10 when the system is activated has been described. It can replace with this and it can be set as embodiment which CPU11 performs a brightness | luminance adjustment process in multiple times at arbitrary timings, when the display apparatus 1 for vehicles is operate | moving.

  Further, in the above-described embodiment, the case where the temperature detected by the temperature sensor 18 is not used for estimating the luminance degradation of the display 15 has been described. However, the present invention is not limited to this, and the temperature, The adjustment brightness can be specified using various parameters such as the display time of the one-image information G1.

  It is known that the display 15 generally has a longer life when used in a low temperature state such as 25 ° C. than in a high temperature state such as 80 ° C. Therefore, the temperature of the display 15 is measured, and life conversion information for correcting the display time from the relationship between the temperature and the life of the display 15 is created in advance. And the display apparatus 1 for vehicles can obtain | require the display time suitable for the use environment of the indicator 15 by correct | amending display time from measured temperature and lifetime conversion information.

  For example, the above-described vehicle display device 1 acquires the temperature detected by the temperature sensor 18 when measuring the display time, obtains the lifetime of the display 15 corresponding to the temperature from the lifetime conversion information, and calculates the lifetime from the lifetime. Correct the display time. Then, the vehicle display device 1 performs a correction for increasing the display time when it can be estimated that the calculated lifetime is shorter than the actual life for the guarantee period of the display 15, and based on the corrected display time and display pattern. The amount of deterioration of the display 15 is estimated. Therefore, since the deterioration amount of the self-luminous display can be estimated more accurately, the entire display screen can be displayed with the same luminance without being affected by the use environment of the self-luminous display.

  As described above, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 vehicle display device 11 CPU
14 Graphic controller (GC)
15 Self-luminous display (display)
15a display screen 15b first display area 15c second display area 15d third display area 16 VRAM
G1 1st image information G11 1st display part G12 2nd display part G13 3rd display part G2 2nd image information P1 Display control means (GC)
P2 Display time measuring means (CPU)
P3 Degradation amount estimation means (CPU)
P4 Correction means (GC)
P5 Transmission image information creation means (GC)

Claims (4)

A vehicle comprising: a self-luminous display having a display screen composed of a plurality of pixels; and display control means for displaying image information indicating a display pattern composed of a plurality of types of display colors on the display screen of the self-luminous display. Display device,
Display time measuring means for measuring the display time of the self-luminous display;
A deterioration amount for estimating a deterioration amount of a plurality of pixels constituting the display screen based on a display time measured by the display time measuring means and a display pattern indicated by image information displayed on the display screen by the display control means. Guessing means,
Correction means for correcting the luminance of each of the plurality of pixels based on the deterioration amount estimated by the deterioration amount estimating means so that the plurality of pixels have the same luminance;
A vehicle display device characterized by comprising: Transmission image information creation for creating transmission image information that transmits the image information so that each of the plurality of pixels has the same luminance based on each display color of the display pattern indicated by the image information and the deterioration amount Having means,
The correction means is means for correcting the luminance of each of the plurality of pixels by translucently combining the transmission image information created by the transmission image information creation means and the image information. The vehicle display device according to 1.   When the correction means switches the display content of the self-luminous display to second image information different from the image information by the display control means, the second image information and the transmissive image information are translucently combined. The vehicle display device according to claim 2, wherein the display device is means for correcting the luminance of each of the plurality of pixels. Having temperature measuring means for measuring the temperature of the self-luminous display,
The deterioration amount estimating means corrects the display time from the relationship between the temperature measured by the temperature measuring means and the lifetime of the self-luminous display, and based on the corrected display time and the display pattern, The vehicle display device according to any one of claims 1 to 3, wherein the vehicle display device is means for estimating a deterioration amount of the light emitting display.