JP2020148954A - Display device - Google Patents

Abstract

To provide a display device including an OLED capable of suppressing burning in consideration of deterioration due to ultraviolet influence in an environment exposed to sunlight.SOLUTION: A display device includes a display unit 10 including a plurality of pixels including an OLED, and a control unit 11 that controls driving of the plurality of pixels. The control unit 11 includes a deterioration estimation unit 12 that estimates the amount of deterioration in OLED, an illuminance information acquisition unit 14 that acquires illuminance information of sunlight in the display unit 10, and a correction unit 18 that corrects the condition of driving the pixels. The deterioration estimation unit 12 calculates the amount of electrification deterioration, which is the amount of deterioration in OLED due to electrification, and estimates the total amount of deterioration including the amount of deterioration due to ultraviolet influence. The correction unit 18 corrects the condition of driving the OLED on the basis of the total amount of deterioration. Thus, the driving condition is corrected based on the total amount of deterioration in OLED including the ultraviolet influence in addition to the electrification influence, and thus, the display device that can suppress the burning as appropriate can be provided.SELECTED DRAWING: Figure 2

Description

The present invention relates to a display device having pixels made of an organic light emitting diode (OLED) and mounted on a moving body such as an automobile.

In recent years, in the display field, the development of various display devices that can be mounted on vehicles such as automobiles has progressed, and in particular, display devices using OLEDs, which are self-luminous elements, are promising because they can improve the display quality. There is. Further, it is considered to mount this kind of display device on, for example, a windshield of an automobile, and for example, the display device described in Patent Document 1 has been proposed.

The display device described in Patent Document 1 includes a transparent OLED film in which an OLED is formed on a transparent film, and a control unit for displaying an image on the OLED. This display device has a configuration in which a transparent OLED film is attached to a windshield and is connected to an image pickup unit mounted on an automobile to display an image or the like obtained by shooting by the image pickup unit.

Japanese Unexamined Patent Publication No. 2005-122981

By the way, when OLED is continuously emitted, the luminous efficiency is lowered according to the light emitting time, and the light emitting brightness is lowered even under the same driving conditions. The larger the light emitting brightness is, that is, the driving current value. The larger the value, the greater the degree of deterioration of the characteristics. Further, in the display device, various images or the like are displayed on the display unit, and the drive history is usually different for each pixel constituting the display unit. Therefore, the degree of deterioration of the light emitting characteristics varies depending on the pixels configured by the OLED, and the pixels that are frequently used are deteriorated more than the pixels that are used less frequently, and a difference in brightness occurs even under the same driving conditions. So-called burn-in, which looks like it is burnt in, occurs.

As a method of suppressing the seizure in the OLED, the deterioration amount of each pixel is estimated from the information such as the current amount and the energization time which are the deterioration factors, and the brightness difference of each pixel is determined based on the estimated deterioration amount. It is possible to correct the driving condition so as to keep it within the range of.

In addition, the characteristics of OLED deteriorate even when it is irradiated with ultraviolet rays (UV). In particular, when used in an environment exposed to sunlight including ultraviolet rays as in the display device described in Patent Document 1, the characteristics of OLED are deteriorated by the influence of ultraviolet rays in addition to the influence of energization.

However, the display device described in Patent Document 1 does not take into consideration the deterioration of the characteristics of the OLED due to the influence of ultraviolet rays, and even if the conventional driving conditions are corrected, the suppression of seizure may be insufficient.

In view of the above points, it is an object of the present invention to provide a display device capable of appropriately suppressing seizure even in an environment exposed to sunlight.

In order to achieve the above object, the display device according to claim 1 is a display device mounted on the moving body (2), and includes a display unit (10) including a plurality of pixels having an OLED. A deterioration estimation unit (12) that estimates the amount of deterioration of the OLED, an illuminance information acquisition unit (14) that acquires illuminance information of sunlight on the display unit, and a correction unit (18) that corrects driving conditions of a plurality of pixels. ), And the deterioration estimation unit calculates the amount of deterioration due to energization of the OLED, and the deterioration due to ultraviolet rays in the OLED based on the illuminance information. The amount is estimated, the total deterioration amount is estimated by adding the deterioration amount due to ultraviolet rays to the energization deterioration amount, and the correction unit makes a correction for setting the OLED to a predetermined brightness based on the total deterioration amount.

According to this, when each pixel is deteriorated by energization, under the condition of being exposed to sunlight, the total deterioration amount including the deterioration amount due to the influence of ultraviolet rays contained in sunlight is estimated and based on the total deterioration amount. This is a display device that corrects the driving conditions of each pixel. Therefore, in an environment exposed to sunlight, the display device can appropriately suppress seizure in consideration of the amount of deterioration of the OLED due to ultraviolet rays.

The reference reference numerals in parentheses attached to each component or the like indicate an example of the correspondence between the component or the like and the specific component or the like described in the embodiment described later.

It is a figure which shows the appearance that the display device of 1st Embodiment was mounted on a vehicle. It is a block diagram which shows the outline structure of the display device of FIG. It is a top view which shows an example of the arrangement of the sub-pixel which has OLED which is a component of a display part. It is sectional drawing which shows the cross-sectional structure between IV-IV in FIG. It is sectional drawing which shows the sectional structure between V and V in FIG. It is a graph which shows the relationship between the relative brightness and cumulative driving time in OLED. It is a figure which shows an example of the UV deterioration table of OLED by sunlight. It is a figure which shows an example of the relationship between the relative brightness of OLED and the cumulative irradiance of sunlight. It is a figure which shows an example which corrected the reference curve for estimating the energization deterioration amount of an OLED in consideration of the deterioration due to the influence of ultraviolet rays. It is a figure which shows an example of the distribution of the irradiation amount of sunlight with the curvature of a display part. It is a figure which shows an example of the positional relationship between the sun and an automobile.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the following embodiments, parts that are the same or equal to each other will be described with the same reference numerals.

(First Embodiment)
The display device 1 of the first embodiment will be described with reference to FIGS. 1 to 10. In FIG. 3, the boundary between the main pixel MPs, which will be described later, is shown by a broken line for convenience. In FIGS. 4 and 5, in order to make the configuration easy to understand and to help understanding, the thickness and dimensions are exaggerated and deformed.

The display device 1 of the present embodiment is preferably applied to a windshield display used by being attached to a windshield 21 of a vehicle 2 such as an automobile, as shown in FIG. 1, for example, but of course, other It can also be applied to the applications of. For example, the display device 1 may be used by being attached to another transparent body such as a side window or a rear window in addition to the windshield. Further, the display device 1 can be applied not only to a windshield display, but also to a meter display, a center display, an electronic mirror, and the like, and the mounting position is appropriately changed according to the application. In this embodiment, the display device 1 when applied to a windshield display will be described.

As shown in FIG. 1, the display device 1 of the present embodiment includes a display unit 10 mounted on the windshield 21 of the vehicle 2. As shown in FIG. 2, the display device 1 includes a display unit 10, a deterioration estimation unit 12, a time information acquisition unit 13, an illuminance information acquisition unit 14, a position information acquisition unit 15, a storage unit 16, and a correction amount calculation unit 17. A control unit 11 including a correction unit 18 and a correction unit 18 is provided.

The display unit 10 is in the form of a flexible film, and in the present embodiment, it is used in a state where it is attached to the windshield 21 to have a predetermined curved surface shape along the windshield 21. As shown in FIG. 2, for example, the display unit 10 displays various images from other in-vehicle devices (not shown) based on the image signals. The display unit 10 is, for example, a transparent OLED film, and as shown in FIG. 3, includes a plurality of main pixel MPs composed of three sub-pixels SP1 to SP3 having different emission colors. The display unit 10 has a configuration in which a plurality of main pixel MPs are arranged along each of the vertical direction and the horizontal direction, for example, the left-right direction of the paper surface of FIG. The subpixels SP1 to SP3 include light emitting regions SP1a to SP3a having an OLED and a thin film transistor (TFT) for driving control thereof, and other non-light emitting regions. The non-light emitting region of each of the subpixels SP1 to SP3 is a transparent region having a higher visible light transmittance than the light emitting regions SP1a to SP3a. The display unit 10 is configured to have a high visible light transmittance as a whole by appropriately adjusting the proportion of the non-light emitting region of each of the subpixels SP1 to SP3, for example. For example, although not limited, the display unit 10 has a visible light transmittance of 70% or more as a whole including the windshield 21 in a state of being attached to the windshield 21.

Note that FIG. 1 shows an example in which the display unit 10 is arranged on almost the entire surface of the windshield 21, but the present invention is not limited to this, and the area of the display unit 10 and its arrangement may be appropriately changed. For example, the display unit 10 has an area similar to the area of the area where an image is displayed in a known head-up display device, and may be arranged in a portion of the windshield 21 located in front of the driver's seat. , May be placed in other parts.

In the display unit 10, for example, as shown in FIG. 4, in the light emitting regions SP1a to SP3a, the barrier layer 5, the TFT layer 6, and the OLED layer 7 are laminated in this order on the transparent film 4, and the adhesive material is placed on the OLED layer 7. Another transparent film 4 is attached via the third transparent film 4. As shown in FIG. 5, for example, the display unit 10 is formed in a non-light emitting region, which is a region different from the light emitting regions SP1a to SP3a, in which a portion of the TFT layer 6 and the OLED layer 7 having a low visible light transmittance is formed. There is no configuration. The display unit 10 is used in a state where the transparent film 4 on the TFT layer 6 side is attached to the windshield 21 via the adhesive material 3.

The transparent film 4 that sandwiches the TFT layer 6 and the OLED layer 7 is made of an arbitrary transparent resin material that is flexible so that it can be attached by following a curved surface such as a windshield 21. These transparent films 4 may be made of the same material or may be made of different materials. Further, the adhesive material 3 is an arbitrary optical adhesive.

As shown in FIG. 4, the TFT layer 6 has a semiconductor layer 61, a gate insulating layer 62, a gate electrode 63, an interlayer insulating layer 64, and a drain on a barrier layer 5 made of a transparent oxide or the like having a low water permeability. The electrode 65, the source electrode 66, and the flattening layer 67 are laminated in this order. In the TFT layer 6, the drain electrode 65 and the source electrode 66 are connected to the semiconductor layer 61 by wiring, and the source electrode 66 is connected to the lower electrode 71 of the OLED layer 7 formed on the flattening layer 67 via through wiring. Has been done. The TFT layer 6 has a configuration in which a predetermined voltage can be applied to the gate electrode 63 by an internal wiring (not shown). The TFT layer 6 causes carrier movement in the semiconductor layer 61 by applying a voltage to the gate electrode 63, and supplies a current to the lower electrode 71 of the OLED layer 7 via the source electrode 66, thereby causing the OLED layer 7 to move. Drive control is performed.

The TFT layer 6 is made of a known material for TFT and is formed by an arbitrary method. Further, the TFT layer 6 is not limited to the example shown in FIG. 4, and other known structures may be adopted.

The OLED layer 7 has a structure in which a lower electrode 71, a partition wall 72, a functional layer 73, an upper electrode 74, and a sealing layer 75 are laminated in this order on a flattening layer 67. In the OLED layer 7, at least the upper electrode 74 and the sealing layer 75 are made of a transparent material, and an electric field is applied between the pair of electrodes 71 and 74 to cause the light emitting layer of the functional layer 73 to emit light, and this light is emitted to the upper electrode. It is configured to be transparent to the 74 side. The functional layer 73 is partitioned by a partition wall 72, and in this order from the anode side of the pair of electrodes 71 and 74, for example, a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer made of a known OLED material. , The electron injection layer is laminated in this order.

The OLED layer 7 is made of a known material for OLED and is formed by an arbitrary method. Further, the functional layer 73 is not limited to the above configuration example, and may have a configuration having a hole block layer, an electron block layer, or the like, or another known configuration may be adopted. Further, the emission colors of the sub-pixels SP1 to SP3 are not limited, but are, for example, red, blue, and green.

The control unit 11 comprises, for example, a storage medium such as a ROM or RAM (not shown), a CPU, or the like mounted on a substrate (not shown) provided with a drive circuit for driving the display unit 10, and an ECU (Electronic Control Unit 11). It constitutes an electronic control unit such as (abbreviation of Unit). For example, as shown in FIG. 2, the control unit 11 is connected to the display unit 10, and when a video signal from another in-vehicle device or the like is input, a CPU (not shown) is stored in the storage unit 16 in advance. It is configured to read and execute various programs to control the driving conditions of the display unit 10.

The control unit 11 controls other in-vehicle devices and their control via an arbitrary in-vehicle communication network (not shown) such as CAN (abbreviation of Controller Area Network, registered trademark) and LIN (abbreviation of Local Interconnect Network). It is connected to the vehicle body ECU and the like. Examples of other in-vehicle devices include, but are not limited to, navigation devices, in-vehicle cameras, vehicle information and communication systems, temperature sensors, illuminance sensors, and the like.

First, the deterioration estimation unit 12 deteriorates due to the influence of energization of each pixel (OLED) constituting the display unit 10 based on the drive history of each pixel based on the video signal, for example, the energization history (hereinafter referred to as "energization deterioration amount"). To estimate. The deterioration estimation unit 12 estimates the amount of energization deterioration of each pixel by using, for example, the following equation (1) used in a known OLED estimated life method as an estimated life curve.

L = α ₀ × exp (−t × β ₀ ) + α ₁ × exp (−t × β ₁ ) ・ ・ ・ (1)
The formula (1) is a known theoretical formula obtained by dividing the deterioration of the OLED into two components, an initial deterioration having a large amount of deterioration and a normal deterioration having a small amount of deterioration thereafter. Further, in the equation (1), L is the luminance, α ₀ and β ₀ are the coefficients in the initial deterioration, α ₁ and β ₁ are the coefficients in the normal deterioration after the initial deterioration, and t is the elapsed time.

When the OLED constituting the pixel is driven by a predetermined constant current, various coefficients are calculated by applying the measured value of the change with time of the brightness of the OLED to the above equation (1), and as shown in FIG. 6, for example. , An estimated life curve showing the relationship between the elapsed time and the brightness of the pixel is created in advance. Further, for the OLED, the acceleration coefficient corresponding to the initial brightness is calculated, and various estimated life curves corresponding to the amount of current, that is, the reference curve are created. The deterioration estimation unit 12 calculates the brightness by applying the elapsed time of each pixel to the obtained data of the reference curve. Thereby, the current brightness with respect to the initial brightness (for example, at the time of product shipment), that is, the relative brightness can be calculated using the reference curve, and the amount of energization deterioration of each pixel can be estimated.

The relative brightness in FIG. 6 is the ratio of the current brightness to the initial brightness, and is an index indicating that the smaller the value, the more the deterioration progresses, that is, the larger the amount of deterioration. Further, the estimation of the energization deterioration amount of each pixel is not limited to the above-mentioned method, and other known methods may be adopted.

Further, the OLED has a characteristic that the brightness decreases when exposed to light including ultraviolet rays (for example, sunlight) even under the same driving conditions, and the brightness gradually decreases as the cumulative irradiation amount of ultraviolet rays increases. Continue to do. Therefore, the deterioration estimation unit 12 estimates the energization deterioration amount of the OLED described above, and corrects the energization deterioration amount in consideration of the deterioration of the OLED due to the influence of ultraviolet rays. That is, the deterioration estimation unit 12 estimates the amount of deterioration of the OLED (hereinafter referred to as "total deterioration amount") in consideration of the effects of both energization and ultraviolet rays.

For example, the deterioration estimation unit 12 corrects the amount of energization deterioration by using a data table of the degree of decrease in brightness with respect to the cumulative irradiance of sunlight as shown in FIG. 7 (hereinafter referred to as “UV deterioration table”). This UV deterioration table is stored in, for example, a storage unit 16, and is used by the deterioration estimation unit 12 for estimating the total deterioration amount, if necessary.

In addition, in FIG. 7, the brightness at the time of driving the OLED in the state where the cumulative irradiance of sunlight is zero at a predetermined gradation value (current value) is set to "100%", and the same gradation value is used for each cumulative irradiance. The brightness of the OLED is quantified for each of the emission colors of red (R), green (G), and blue (B). Since the amount of deterioration of the OLED due to the influence of ultraviolet rays differs depending on the configuration of the OLED, the emission color, and the like, the UV deterioration table is not limited to the example shown in FIG. 7, and may be appropriately changed according to the configuration of the OLED and the like.

Further, instead of the UV deterioration table, the deterioration estimation unit 12 corrects the amount of energization deterioration based on the UV reference curve that graphs the relative brightness with respect to the cumulative irradiance of sunlight, for example, as shown in FIG. , The total amount of deterioration may be calculated. The UV degradation table and UV reference curve can be created by any method such as luminance measurement.

That is, as shown in FIG. 9, for example, the deterioration estimation unit 12 corrects the estimation curve X1 of the energization deterioration amount shown by the broken line based on the UV deterioration table or the like, and obtains the corrected estimation curve X2 shown by the solid line. Based on this, the total amount of deterioration is calculated. In other words, the deterioration estimation unit 12 adds the deterioration amount due to ultraviolet rays to the energization deterioration amount, and estimates the total deterioration amount as the deterioration amount of the OLED.

The "calculation by adding the amount of deterioration due to ultraviolet rays to the amount of deterioration of energization" here may be a calculation method such as multiplying the amount of deterioration of energization by the relative brightness corresponding to the cumulative irradiance, and is simply addition. It is not limited to.

The time information acquisition unit 13 acquires information on time and time from an arbitrary timer or the like. The time information acquisition unit 13 acquires information on time and time from an external electronic device (not shown) or the like, and outputs a signal corresponding to the information to the deterioration estimation unit 12. The time information data may be transmitted to the deterioration estimation unit 12, or may be stored in the storage unit 16 as the drive time of each pixel and the cumulative drive time obtained by integrating the drive time, and may be read by the deterioration estimation unit 12. Further, the information regarding the time acquired by the time information acquisition unit 13 is output to the illuminance information acquisition unit 14 and the position information acquisition unit 15 as necessary, and is used for estimating the illuminance distribution of sunlight in the vehicle interior of the vehicle 2. It may be used.

The illuminance information acquisition unit 14 acquires information on the illuminance due to sunlight in the vehicle interior of the vehicle 2. As shown in FIG. 1, the illuminance information acquisition unit 14 is connected to an arbitrary illuminance sensor 22 installed in the vehicle interior by in-vehicle communication (not shown), and illuminance information is input by inputting a signal corresponding to the illuminance. To get. The illuminance sensor 22 is not limited to the mounting example shown in FIG. 1, and can be mounted at any position in the vehicle interior.

Further, the illuminance information acquisition unit 14 determines the distribution of the irradiance (unit: MJ / m ² ) in the display unit 10 based on the illuminance information acquired from the illuminance sensor 22 and the illuminance distribution table stored in the storage unit 16 in advance. presume. Specifically, for example, as shown in FIG. 10, the display unit 10 has a curved surface shape, so that the irradiation amount when exposed to sunlight is distributed. For example, the portion of the display unit 10 that is arranged closer to perpendicular to the sunlight irradiation direction (white arrow in FIG. 10) has a relatively larger irradiation amount and is arranged closer to parallel to the irradiation direction. The amount of irradiation is relatively small as the portion is marked with. In the present embodiment, the irradiance distribution table is a data table having an irradiation illuminance distribution corresponding to the shape of the display unit 10 attached to the windshield 21, and is stored in the storage unit 16. The illuminance information acquisition unit 14 estimates the illuminance distribution in the display unit 10 having a predetermined curvature based on this illuminance distribution table. This curvature is appropriately set according to the portion to which the display unit 10 is attached (in this embodiment, the windshield 21).

The illuminance distribution data in the display unit 10 obtained by the illuminance information acquisition unit 14 is stored in the storage unit 16 together with the time information from the time information acquisition unit 13, and is stored as the cumulative irradiance of sunlight. Further, when acquiring illuminance information from an in-vehicle device that operates in conjunction with ON / OFF of the ignition of the vehicle 2 such as the illuminance sensor 22, the illuminance information when the ignition of the vehicle 2 is OFF is as follows, for example. Can be estimated in various ways. For example, when the ignition of the vehicle 2 is turned off, the control unit 11 stores the first time information when the ignition of the vehicle 2 is turned off, and then turns the ignition of the vehicle 2 on. The second time information of the time is stored. Then, the control unit 11 calculates the integrated illuminance while the illuminance sensor 22 is in the OFF state based on the difference between the first time information and the second time information and the illuminance distribution table, and integrates it in the storage unit 16. Control is performed to store the illuminance and store it as the cumulative irradiance of sunlight. By calculating the cumulative irradiance by the above method or the like, the estimation accuracy of the total deterioration amount can be further improved.

The position information acquisition unit 15 acquires the position information in the vehicle interior of each of the display unit 10 and the illuminance sensor 22. For example, the position information acquisition unit 15 can acquire these position information by in-vehicle communication with the vehicle body ECU that controls the functions of various in-vehicle devices. Specifically, when the vehicle body ECU communicates with the display device 1, the vehicle body ECU estimates the position of the display unit 10 based on the coordinate data in the vehicle interior stored in advance in the storage unit of the vehicle body ECU, and obtains the estimated position information. It is transmitted to the control unit 11 of the display device 1 by in-vehicle communication. This also applies to the acquisition of the position information of the illuminance sensor 22. In this case, the position information of the display unit 10 and the illuminance sensor 22 is transmitted from the vehicle body ECU by in-vehicle communication when the first ignition of the vehicle 2 on which the display device 1 is mounted is turned on, and then stored. It may continue to be held by the unit 16. Further, these position information may be transmitted by in-vehicle communication each time the ignition of the vehicle 2 is turned on after the display device 1 is mounted, stored in the storage unit 16, and updated every time. ..

The user or the like may input the coordinate data of the display device 1 or the illuminance sensor 22, and the storage unit 16 may hold this information. As described above, the position information of the display unit 10 and the illuminance sensor 22 can be acquired by any method.

The storage unit 16 is a storage medium in which various programs and various data tables executed by the control unit 11 are stored, and may be composed of, for example, a ROM (not shown), a RAM, a non-volatile RAM, or the like (not shown). The storage unit 16 stores various data such as the total deterioration amount of each pixel constituting the display unit 10 and the cumulative irradiance of sunlight.

The correction amount calculation unit 17 of each pixel estimated by the deterioration estimation unit 12 using the time information from the time information acquisition unit 13, the illuminance information from the illuminance information acquisition unit 14, the position information from the position information acquisition unit 15, and the like. Based on the total deterioration amount, the correction amount of the gradation value with each pixel as a predetermined brightness is calculated. That is, the correction amount calculation unit 17 calculates the gradation value required to maintain each pixel at a predetermined brightness based on the total deterioration amount of each pixel.

The correction unit 18 corrects the driving conditions of each pixel based on the correction amount calculated by the correction amount calculation unit 17 so that the brightness of each pixel becomes a predetermined value. The correction of this drive condition is, for example, adjustment of the drive current value that makes each pixel the same brightness as the initial EL brightness, or the correction of the drive current value that makes each pixel the same brightness as the EL brightness of the other pixels. Adjustment and the like can be mentioned, and any method can be adopted. In this way, the display unit 10 displays various images based on the driving conditions corrected by the correction unit 18.

The display device 1 of the present embodiment has the above-described configuration. The control unit 11 estimates the amount of deterioration of the energization of the OLED, estimates the total amount of deterioration of the OLED in consideration of the deterioration of the influence of ultraviolet rays based on the illuminance information, and corrects the driving conditions of the OLED. However, it is not limited to the configuration example and the processing example shown in FIG.

By the way, in a conventional display device provided with an OLED, it has been proposed to arrange a UV blocking layer having a high ultraviolet absorption rate in a color filter or the like in order to suppress the burning of the OLED due to the influence of ultraviolet rays (for example, special feature). Open 2010-237566). As a result, deterioration of the OLED due to the influence of ultraviolet rays can be suppressed, and seizure of the OLED can be suppressed.

However, if the color filter includes a UV blocking layer, the user can visually recognize the light emission of the OLED through the UV blocking layer, and the chromaticity may change, so that the original optical characteristics of the OLED may change. .. Further, it is conceivable to arrange the UV blocking layer on the transparent film 4 side of the transparent OLED film to be attached to the windshield 21, but in this case, the UV blocking layer generates excessive heat due to the absorption of ultraviolet rays, and the windshield 21 can be damaged.

On the other hand, since the display device 1 of the present embodiment does not have the above-mentioned UV blocking layer, the optical characteristics of the original OLED do not change, and excessive heat generation due to ultraviolet absorption does not occur. .. Further, even if the brightness of the OLED is lowered by ultraviolet rays, the display device 1 estimates the amount of deterioration due to the influences of both energization and ultraviolet rays by the deterioration estimation unit 12, and corrects the driving conditions, so that seizure is appropriately performed. It is a configuration that can be suppressed.

According to the present embodiment, the display device 1 is subjected to correction of driving conditions in consideration of deterioration due to the influence of ultraviolet rays in addition to the influence of energization in a situation exposed to sunlight. Therefore, the deterioration of the OLED due to the influence of ultraviolet rays, which has not been considered in the conventional display device, is also taken into consideration, and the display device can perform appropriate seizure suppression.

(Other embodiments)
The display device shown in each of the above-described embodiments shows an example of the display device of the present invention, and is not limited to each of the above-described embodiments, but is within the scope of claims. Can be changed as appropriate.

(1) The illuminance information acquisition unit 14 may be configured to estimate the illuminance of the display unit 10 based on the traveling direction of the vehicle 2 and the positional relationship between the vehicle 2 and the sun in conjunction with the position information acquisition unit 15. Good. Specifically, for example, the position information acquisition unit 15 is configured to acquire information on the traveling direction of the vehicle 2 by another in-vehicle device such as GPS in addition to the functions of the first embodiment. Then, the illuminance information acquisition unit 14 acquires the date and time information from the time information acquisition unit 13, and estimates the positional relationship between the vehicle 2 and the sun based on the traveling direction of the vehicle 2, as shown in FIG. Then, the storage unit 16 stores in advance an illuminance distribution table in the vehicle interior corresponding to the positional relationship between the vehicle 2 and the sun. For example, as shown in FIG. 11, at time T1, vehicle 2 is illuminated by the sun from the front, at time T2, vehicle 2 is illuminated by the sun from above, and at time T3, vehicle 2 is illuminated by the sun from behind. Prepare an illuminance distribution table in the vehicle interior according to the positional relationship. The illuminance information acquisition unit 14 selects the corresponding one from the plurality of illuminance distribution tables, and estimates the illuminance of the display unit 10 based on the selected illuminance distribution table.

As a result, the control unit 11 estimates the irradiance of the display unit 10 based on the positional relationship between the vehicle 2 and the sun and corrects the driving conditions of each pixel, so that the accuracy of the correction is expected to be further improved. Will be done. Further, when the display device according to the present disclosure is applied to a different purpose from the windshield display, that is, when the display unit 10 is mounted in a place other than the windshield 21 such as a meter device, the display unit 10 The total amount of deterioration can be calculated appropriately.

(2) In each of the above embodiments, the control unit 11 may acquire various information such as the date and time and the weather by wireless communication via the communication unit mounted on the vehicle 2 via the Internet, cloud computing, or the like. In particular, in calculating the integrated illuminance during the period when the illuminance sensor 22 is OFF, it is preferable to use the weather information or the like during the period because the calculation accuracy of the integrated illuminance and the estimation accuracy of the total deterioration amount of the OLED are improved.

(3) In each of the above embodiments, an example in which the display device is mounted on an automobile has been described, but the present invention is not limited to this example, and is also mounted on other moving bodies exposed to sunlight, such as motorcycles, trains, and aircraft. It goes without saying that it can be done.

(4) In the above first embodiment, when the display unit 10 is applied to an application in which the visible light transmittance when the windshield 21 or the like is mounted, for example, a meter display or the like, the display unit 10 is made of a transparent OLED film. It does not have to be. In this case, the display unit 10 may be configured such that the transparent film 4 is arranged on the side from which the light emission of the OLED is taken out, and is arbitrary instead of the transparent film 4 attached to the mounted member such as the instrument panel. A resin film may be used.

1 Display device 10 Display unit 12 Deterioration estimation unit 14 Illuminance information acquisition unit 18 Correction unit 2 Moving object (vehicle)
21 Windshield

Claims (5)

A display device mounted on the moving body (2).
A display unit (10) having a plurality of pixels having an OLED, and
A deterioration estimation unit (12) that estimates the amount of deterioration of the OLED, an illuminance information acquisition unit (14) that acquires illuminance information of sunlight on the display unit, and a correction that corrects driving conditions of a plurality of the pixels. A control unit (11) having a unit (18) is provided.
The deterioration estimation unit calculates the amount of deterioration due to energization in the OLED, estimates the amount of deterioration due to ultraviolet rays in the OLED based on the illuminance information, and determines the amount of deterioration due to ultraviolet rays in the amount of energization deterioration. Estimate the total amount of deterioration including the amount,
The correction unit is a display device that performs the correction for making the OLED a predetermined brightness based on the total deterioration amount. The display portion is used in a state of being a flexible film and having a curved surface shape.
The display device according to claim 1, wherein the illuminance information acquisition unit estimates an illuminance distribution according to the curvature of the display unit having a curved surface shape. The moving body is a vehicle and
The display device according to claim 2, wherein the display unit is a transparent OLED film and is mounted on the windshield (21) of the vehicle. The moving body is a vehicle equipped with an illuminance sensor (22).
The display unit and the position information acquisition unit (15) for acquiring the position information of the illuminance sensor in the vehicle interior of the vehicle are further provided.
The display device according to any one of claims 1 to 3, wherein the illuminance information acquisition unit estimates the illuminance of the display unit based on the position information of the display unit and the illuminance sensor in the vehicle interior. Further equipped with a time information acquisition unit (13) for acquiring time information,
The position information acquisition unit estimates the positional relationship between the vehicle and the sun based on the time information, and determines the positional relationship between the vehicle and the sun.
The display device according to claim 4, wherein the illuminance information acquisition unit estimates the illuminance distribution in the vehicle interior based on the positional relationship and estimates the illuminance of the display unit based on the illuminance distribution.

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