JP2016099419A - Display device and display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device and a display method with which a reduction of video quality can be suppressed while reducing a ghost.SOLUTION: There is provided an organic EL display 100 including a wobbling part that changes a display position of an image to be displayed on an organic EL panel 10, where each of a plurality of pixel parts P constituting the organic EL panel has first sub pixel parts PR, PG, and PB corresponding to each of colors: RGB and a second sub pixel part PW corresponding to a mixed color obtained by mixing at least two colors of the plurality of colors; the wobbling part moves the center of gravity of the brightness of each of the plurality of display pixels constituting an image by an amount smaller than one pixel part.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a display device and a display method capable of displaying an image using a plurality of colors.

  In an organic EL (electroluminescence) display or plasma display, for example, control for shifting the position of an image about once every few minutes to several tens of minutes in order to reduce deterioration in image quality due to burn-in (hereinafter referred to as “wobbling” as appropriate) (Refer to Patent Document 1, for example). The display device of Patent Document 1 has a display panel in which a plurality of pixel portions are arranged in a matrix. Each of the plurality of pixel portions corresponds to each display pixel constituting an image indicated by the video signal. In the display device of Patent Document 1, the display position of an image is shifted in units of one pixel unit in the vertical and horizontal directions for wobbling. Thereby, the brightness | luminance in each of the several pixel part which comprises a display panel can be changed.

JP 2004-45815 A

  However, when the position of the image is shifted in units of one pixel unit, there is a problem that the user can recognize that the position of the image is shifted and the video quality may be deteriorated.

  The present disclosure provides a display device and a display method capable of suppressing deterioration in video quality while reducing burn-in.

  The display device according to the present disclosure is a display device including a display control unit that changes a display position of an image displayed on the display panel, and each of the plurality of pixel units constituting the display panel has a plurality of colors. A plurality of first sub-pixel units corresponding to each of the first sub-pixel units, and a second sub-pixel unit corresponding to a combined color obtained by combining at least two of the plurality of colors, and the display control unit Moves the center of gravity of each of the plurality of display pixels constituting the image by an amount smaller than that of one pixel portion.

  The display device and the display method according to the present disclosure are effective for suppressing deterioration in video quality while reducing burn-in.

The figure which shows an example of the external appearance of the organic electroluminescent display concerning embodiment The figure which shows an example of a structure of the organic electroluminescent display concerning embodiment Circuit diagram showing an example of configuration of sub-pixel unit Block diagram showing an example of TCON functions according to an embodiment The block diagram which shows an example of a structure of the brightness | luminance conversion part concerning embodiment The figure which shows the display method of two pixel parts adjacent to right and left in time series The figure which shows an example of arrangement | positioning of the sub pixel part in the modification 1 of embodiment. The figure which shows an example of arrangement | positioning of the sub pixel part in the modification 2 of embodiment. The figure which shows an example of arrangement | positioning of the sub pixel part in the modification 2 of embodiment. The figure which shows an example of arrangement | positioning of the sub pixel part in the modification 3 of embodiment. The figure which shows an example of arrangement | positioning of the sub pixel part in the modification 3 of embodiment. Diagram showing conventional display method in time series Diagram showing conventional display method in time series

(Details of issues and knowledge underlying this disclosure)
As described above, when the image position is shifted in units of one pixel unit, the user viewing the display panel may notice that the image position is shifted. In this case, there is a problem that the video quality is degraded.

  On the other hand, as a method of moving the image by an amount smaller than one pixel portion, for example, an intermediate image between the image before the movement and the image after the movement is generated by image processing, and the intermediate image is displayed on the display panel. A method of making it possible is conceivable.

  Specifically, the luminance value of each of the intermediate pixels constituting the intermediate image corresponds to the intermediate pixel in the image before the movement, for example, when moving the image in the right direction by an amount of 0.5 pixels. This is the median value of the luminance value of the display pixel and the luminance value of the display pixel adjacent to the left side of the display pixel. The luminance value of the intermediate pixel becomes the luminance value of the corresponding pixel portion of the display panel.

  However, in this case, since the luminance value of the pixel portion is the median value of the luminance values of the two display pixels, there is a problem that the edge portion of the luminance is blurred and the video quality is deteriorated.

  For this reason, in order to suppress degradation in video quality due to burn-in of the display device, the display position of the image can be moved without blurring the image and in a state where the user cannot recognize the change in the position of the image. Technology is desired.

  Here, the display device generally includes a plurality of pixel portions arranged in a matrix. Each of the plurality of pixel portions has a plurality of sub-pixel portions corresponding to a plurality of colors. The display device includes a plurality of first sub-pixel portions corresponding to a plurality of colors such as red (R), green (G), and blue (B), and a second sub-portion corresponding to a composite color such as white (W). Some have a pixel portion.

  The present inventor, in a display device including the above-described second sub-pixel unit that outputs a color for composite color, as a composite color expression method, a method of expressing a composite color by combining a plurality of first sub-pixel units, A plurality of methods such as a method of expressing a composite color using a second sub-pixel unit that outputs a color for color, and a method of expressing a composite color by combining a plurality of first sub-pixel units and second sub-pixel units. We focused on the expression method.

  Furthermore, the present inventor shows that in the display device corresponding to the plurality of colors and the composite color described above, the center of luminance of each of the plurality of display pixels constituting the image displayed on the display panel differs depending on the expression method. It was found that the center of gravity of the luminance can be moved by an amount smaller than that of one pixel portion by using a plurality of expression methods in combination. Note that the luminance center of gravity is the position of the luminance peak in each of the display pixels constituting the image.

  However, in general, the configuration of the plurality of sub-pixel units that form the pixel unit differs depending on the display device (see the following embodiment and Modifications 1 to 3). A general display device is not configured to perform control in units of sub-pixel units from the outside of the display device. For this reason, it is difficult to specify the luminance value of each of the plurality of sub-pixel units directly from the outside of the display device.

  Note that, for example, the above-described image processing can be considered as a method of changing the position of the center of gravity of the luminance of the display pixel by control outside the apparatus. However, since the video signal input from the outside of the apparatus is composed of pixel values (luminance values, saturation, etc.) of each of the plurality of display pixels constituting the image, it is only possible to specify the luminance value in so-called pixel unit units. Not possible. When moving the display position of an image by image processing, the position of the center of gravity of the luminance of the image depends on the configuration of the sub-pixel unit, so the determination of the arrangement of the sub-pixel unit and the content of the image processing depending on the determination result Need to change. Further, as described above, the image processing has a problem that the luminance edge may be blurred.

  However, wobbling to change the display position of the image displayed on the display panel is not controlled by an external control signal input from the outside, but is an internal control executed inside the apparatus. Can be specified. Furthermore, in the case of wobbling, since it is internal control, there is no need to change the process according to the difference in the configuration of the sub-pixel unit.

  The present inventor has found that wobbling can be controlled in units of sub-pixel units, and the method of expressing a composite color can be changed by control in units of sub-pixel units.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The inventor provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims. Absent.

(Embodiment)
Hereinafter, an embodiment will be described with reference to FIGS. In the present embodiment, a case where the display device is an organic EL display will be described as an example.

  In the following description, a pixel as a physical device constituting the display panel is referred to as a “pixel portion” or a “sub-pixel portion”, and a pixel constituting an image indicated by the video signal is referred to as a “display pixel”. .

  The display device of this embodiment includes a plurality of first sub-pixel units that output light of a plurality of colors (for example, a single color) and a composite color obtained by combining at least two of the plurality of colors. And a second sub-pixel unit that outputs the light. In wobbling, the display device according to the present embodiment moves the luminance gravity center of each of a plurality of display pixels constituting an image by an amount smaller than that of one pixel unit.

[1. Configuration of display device]
FIG. 1 is a diagram illustrating an example of an appearance of an organic EL display according to an embodiment. FIG. 2 is a diagram illustrating an example of the configuration of the organic EL display according to the embodiment.

  As shown in FIG. 2, the organic EL display 100 includes an organic EL panel 10, a data line driving circuit 20, a scanning line driving circuit 30, and a timing controller (hereinafter abbreviated as “TCON”) 40. Yes.

[1-1. Configuration of organic EL panel]
As shown in FIG. 2, the organic EL panel 10 includes a plurality of data lines DR1, DG1, DB1, and DW1 to DRn, DGn, DBn, and DWn extending in the column direction, a plurality of scanning lines Scan1 to Scanm extending in the row direction, And a plurality of pixel portions P arranged at a plurality of intersections of the data lines and the plurality of scanning lines. In other words, the plurality of pixel portions P are arranged in a matrix of m rows and n columns.

  The pixel unit P includes a plurality of first sub-pixel units corresponding to a plurality of colors and a second sub-pixel unit corresponding to a synthesized color obtained by synthesizing at least two of the plurality of colors. ing. In the present embodiment, the pixel portion P includes a first sub-pixel portion PR that emits red (R) light, a first sub-pixel portion PG that emits green (G) light, and blue (B). The first sub-pixel portion PB that emits the light of the above is provided. Further, the pixel portion P includes a second sub-pixel portion PW that emits white (W) light obtained by combining red light, green light, and blue light.

  Hereinafter, the configurations of the first sub-pixel portions PR, PG, PB and the second sub-pixel portion PW will be described with reference to FIG. However, the configurations of the first sub-pixel portions PR, PG, PB and the second sub-pixel portion PW are the same except for the color filter. For this reason, for the configuration other than the color filter, the first sub-pixel portion PR will be described, and the description of the other sub-pixel portions will be omitted.

  FIG. 3 is a circuit diagram illustrating an example of the configuration of the first sub-pixel unit PR. As illustrated in FIG. 3, the first sub-pixel unit PR includes an organic EL element OEL, a capacitive element Cs, a selection transistor Trs, and a drive transistor Trd.

  The organic EL element OEL is a light emitting element that emits light according to a drive current. In the present embodiment, the organic EL element OEL is a light emitting element that outputs white light. The drive current is supplied from the drive transistor Trd. The organic EL element OEL has an anode electrode connected to the source electrode of the drive transistor Trd and a cathode electrode connected to a power supply line VEL (VEL is a ground voltage, for example).

  The capacitive element Cs is a capacitive element that accumulates charges according to the voltage of the data line DR. The capacitive element Cs has a first electrode connected to the gate electrode of the drive transistor Trd, and a second electrode connected to a connection node Ns between the anode terminal of the organic EL element OEL and the source electrode of the drive transistor Trd.

  The driving transistor Trd supplies the organic EL element OEL with a driving current corresponding to the amount of charge of the capacitive element Cs accumulated according to the voltage of the data line DR. The drive transistor Trd is a thin film transistor, and has a gate electrode connected to the first electrode of the capacitive element Cs, a source electrode connected to the anode electrode of the organic EL element OEL, and a drain electrode connected to the power supply line VTFT.

  The selection transistor Trs is a switch element that switches between conduction and non-conduction between the data line DR and the first electrode of the capacitive element Cs in accordance with the voltage of the scanning line Scan. More specifically, the selection transistor Trs is a thin film transistor, the gate electrode is connected to the scanning line Scan, the source electrode is connected to the data line DR, and the drain electrode is connected to the first electrode of the capacitor Cs and the gate voltage of the driving transistor Trd. Each is connected to a node Ng.

  Furthermore, as shown in FIG. 2, in the present embodiment, in the pixel portion P, the first sub-pixel portions PR, PG, PB and the second sub-pixel portion PW are arranged in this order in the row direction. In other words, the first sub-pixel parts PR, PG, PB and the second sub-pixel part PW are alternately arranged in units of columns.

  In the region where the first sub-pixel portion PR is formed, a color filter that allows light having a red wavelength to pass is formed on the light emission surface side of the organic EL element OEL. Similarly, in the region where the first sub-pixel portion PG is formed, a color filter that allows light having a green wavelength to pass is formed on the light emission surface side of the organic EL element OEL. In the region where the first sub-pixel portion PB is formed, a color filter that allows light of a blue wavelength to pass is formed on the light emission surface side of the organic EL element OEL. Note that no color filter is formed in the region where the second sub-pixel portion PW is formed. By configuring in this way, the first sub-pixel portions PR, PG, PB and the second sub-pixel portion PW can be formed.

  In addition, although it is possible to form a color filter by mask vapor deposition, for example, it is not limited to this. For example, a blue light emitting organic EL element may be formed, and a color conversion layer (CCM: Color Change Medium) for converting blue light into R, G, and B colors may be provided.

  Further, in the present embodiment, a case has been described in which all the sub-pixel portions are configured by white organic EL elements OEL, and a color filter that allows light of each color to pass is provided in the first sub-pixel portion. is not. For example, the organic EL element OEL may be formed using a material corresponding to the corresponding color.

  In this embodiment, the case where the selection transistor Trs and the drive transistor Trd are thin film transistors has been described as an example. However, the present invention is not limited to this. The selection transistor Trs and the drive transistor Trd may be FETs, MOS-FETs, MOS transistors, bipolar transistors, or the like. Furthermore, the selection transistor Trs is not limited to a transistor, and may be an analog switch or the like.

[1-2. Configuration of Data Line Drive Circuit, Scan Line Drive Circuit, and TCON]
The data line driving circuit 20 is a circuit that applies a data signal corresponding to the first control signal from the TCON 40 to the source line.

  The scanning line driving circuit 30 applies a scanning signal for turning on or off the selection transistor Trs connected to the scanning line Scan according to the second control signal from the TCON 40 to each of the scanning lines Scan. To do.

  The TCON 40 is an example of a control unit that controls display of video using a plurality of pixel units P. The TCON 40 has a function of controlling the data line driving circuit 20 and the scanning line driving circuit 30. During the display operation, the TCON 40 outputs a first control signal having a voltage value corresponding to a video signal input from the outside to the data line driving circuit 20 and outputs a second control signal to the scanning line driving circuit 30. Is output.

  In the present embodiment, the TCON 40 is described as an example of a dedicated LSI (Large Scale Integration), but the present invention is not limited to this. The TCON 40 may be configured by a computer system including a microprocessor (MPU), a ROM, a RAM, and the like, for example. In this case, each operation described above can be realized by the microprocessor operating in accordance with a computer program for executing each operation described above.

  FIG. 4 is a block diagram illustrating an example of the functions of the TCON 40. As shown in FIG. 4, the TCON 40 has a function as an image processing unit 41 that performs processing on a video signal input from the outside. The image processing unit 41 includes a signal processing unit 42 and a wobbling unit 43.

  The signal processing unit 42 performs decoding of the encoded signal, adjustment of the image size, and the like.

  The wobbling unit 43 is an example of a display control unit that changes the display position of an image displayed on the organic EL panel 10 in order to prevent burn-in. The wobbling unit 43 includes a center of gravity determination unit 44 and a luminance conversion unit 45.

  The center-of-gravity determination unit 44 sequentially changes the position of the center of gravity of the luminance.

  The luminance conversion unit 45 determines the luminance of the composite color expressed by the first sub-pixel unit PR, PG, PB and the second sub-pixel unit PW according to the luminance centroid (position) determined by the centroid determination unit 44. The luminance is distributed to the first sub-pixel parts PR, PG, PB and the second sub-pixel part PW so that the value matches the gradation value of the video signal.

  FIG. 5 is a block diagram illustrating an example of the configuration of the luminance conversion unit 45. In FIG. 5, L (n) is the gradation value of the target pixel among the plurality of display pixels constituting the image before conversion, and L (n−1) is the left adjacent pixel adjacent to the left side of the target pixel. Gradation value. p indicates the relative position of the barycenter of luminance when the length of the pixel portion P in the row direction is 1. That is, 0 ≦ p <1. Each of R (n), G (n), B (n), and W (n) is a first sub-pixel portion PR, PG, PB and second sub-pixel when displaying the converted image on the display panel. This is the luminance value of each pixel unit PW.

[2. Operation]
The operation of the organic EL display 100 will be described with reference to FIG. In this embodiment, for the sake of explanation, a case where the gradation value of the video signal is 10 is considered.

  FIG. 6 is a diagram showing the display method of two pixel portions P1 (an example of a first pixel portion) and a pixel portion P2 (an example of a second pixel portion) adjacent to the left and right in time series. In FIG. 6, the position of the barycenter of luminance when the white color is displayed by the three sub-pixel parts PR, PG, and PB is set to zero. In FIG. 6, the position indicated by the black circle is the center of gravity of the luminance. In FIG. 6, the sub-pixel portion whose luminance value is other than 0 is indicated by a solid line, and the sub-pixel portion whose luminance value is 0 is indicated by a broken line.

  Hereinafter, a method of calculating the luminance of the first sub-pixel units PR, PG, PB and the second sub-pixel unit PW in the image after movement, which is executed by the luminance conversion unit 45, will be described.

  In the case of 0 ≦ p <0.55, the converted luminance values R (n), G (n), B (n), and W (n) can be obtained by the following equations 1 and 2.

  R (n) = G (n) = B (n) = L (n) × (0.55-p) /0.55 (Equation 1)

  W (n) = (L (n) × p) /0.55 (Expression 2)

  In the case of 0.55 ≦ p <1, the converted luminance values R (n), G (n), B (n), and W (n) can be obtained by the following equations 3 and 4.

  R (n) = G (n) = B (n) = L (n−1) × (p−0.55) /0.45 (Equation 3)

  W (n) = L (n) × (1-p) /0.45 (Expression 4)

  Here, consider the case of L (n) = 10, L (n−1) = 0, and L (n + 1) = 0.

  When 0 is designated as p at time t1, R (n) = G (n) = B (n) = 10 and W (n) = 0 are obtained from Equation 1 and Equation 2. Further, R (n + 1) = G (n + 1) = B (n + 1) = 0 and W (n + 1) = 0.

  That is, at time t1, as shown in FIG. 6, the first sub-pixel portion PR, PG, PB of the pixel portion P1 is used, and the white value of 10 is displayed without using the second sub-pixel portion PW. ing.

  When p is specified to be 0.275 at time t2, R (n) = G (n) = B (n) = 5 and W (n) = 5 from Equations 1 and 2. Further, R (n + 1) = G (n + 1) = B (n + 1) = 0 and W (n + 1) = 0.

  That is, at time t2, as shown in FIG. 6, white having a luminance value of 10 is displayed using the first sub-pixel portions PR, PG, PB and the second sub-pixel portion PW of the pixel portion P1. At time t2, the luminance values of the first sub-pixel portions PR, PG, PB and the second sub-pixel portion PW are all the same value, but the present invention is not limited to this. When p is determined to be smaller than 0.275, the luminance values of the first sub-pixel portions PR, PG, and PB are considered to be larger than the luminance value of the second sub-pixel portion PW. When p is determined to be a value between 0.275 and 0.55, it is considered that the luminance values of the first sub-pixel portions PR, PG, and PB are smaller than the luminance value of the second sub-pixel portion PW.

  When p is determined to be 0.55 at time t3, R (n) = G (n) = B (n) = 0 and W (n) = 10 from Equation 3 and Equation 4. Further, R (n + 1) = G (n + 1) = B (n + 1) = 0 and W (n + 1) = 0.

  That is, at time t3, as shown in FIG. 6, white having a luminance value of 10 is displayed using the second sub-pixel portion PW of the pixel portion P1. Until the time t3, it can be said that the center of gravity of the luminance moves within the pixel portion P1.

  When p is determined to be 0.775 at time t4, R (n) = G (n) = B (n) = 0 and W (n) = 5 from Equation 3 and Equation 4. Further, R (n + 1) = G (n + 1) = B (n + 1) = 5 and W (n + 1) = 0.

  That is, at time t4, as shown in FIG. 6, white having a luminance value of 10 is obtained using the second sub-pixel unit PW of the pixel unit P1 and the first sub-pixel units PR, PG, and PB of the pixel unit P2. it's shown. At time t4, the luminance value of the second sub-pixel unit PW of the pixel unit P1 and the luminance value of the first sub-pixel units PR, PG, and PB of the pixel unit P2 are the same value. It is not limited. When p is determined to be a value smaller than 0.775, the luminance value of the second sub-pixel unit PW of the pixel unit P1 is larger than the luminance values of the first sub-pixel units PR, PG, and PB of the pixel unit P2. It is considered to be. When p is determined to be a value between 0.775 and 1, the luminance value of the second sub-pixel unit PW of the pixel unit P1 is equal to the luminance value of the first sub-pixel units PR, PG, and PB of the pixel unit P2. It is considered to be smaller than the luminance value.

  At time t5, the pixel is moved by the amount of one pixel portion from the state at time t1. That is, at time t5, as shown in FIG. 6, white having a luminance value of 10 is displayed using the first sub-pixel portions PR, PG, and PB of the pixel portion P2.

  As described above, in this embodiment, the positions of the center of gravity of the display pixels are 0, 0.275, 0.55, and 0.775, and are moved in the row direction by an amount smaller than that of one pixel portion. Further, in FIG. 6, the combination of the sub-pixel portions that express white is changed at each time from time t1 to time t5. At times t1 to t3, the combination of sub-pixel portions used for white expression is changed in the pixel portion P1. At times t4 and t5, a part of the plurality of sub-pixel parts constituting the pixel part P1 and a part of the plurality of sub-pixel parts constituting the pixel part P2 are combined. Accordingly, at the times t4 and t5, the center of gravity of the luminance moves from the pixel portion P1 to the pixel portion P2.

  In the present embodiment, at times t1 to t4, p is determined to be 0, 0.275, 0.55, and 0.775. However, the present invention is not limited to this. p may be specified more finely. In particular, if p is determined so that the luminance values of the first sub-pixel parts PR, PG, PB and the second sub-pixel part PW are integers, the calculation can be facilitated and the calculation load on the TCON 40 is reduced. I think it can be done. Moreover, p should just be determined at least one numerical value other than 0.

  Furthermore, in the present embodiment, the sub-pixel portions are arranged in the order of the first sub-pixel portions PR, PG, PB, and the second sub-pixel portion PW. However, the present invention is not limited to this. The first sub-pixel portion PR, the second sub-pixel portion PW, the first sub-pixel portion PB, PG, etc. may be in any order. However, it is preferable that the high-luminance green (G) first sub-pixel portion PB and the white (W) second sub-pixel portion PW are not adjacent to each other.

  By executing the processing described above for all the pixel portions, the display position of the image can be shifted without blurring the image.

[3. Modification 1: Sub-pixel portions are arranged in a line in the column direction]
In the above embodiment, the case where the first sub-pixel portions PR, PG, PB, and the second sub-pixel portion PW are arranged in the row direction has been described as an example. However, the first sub-pixel portions PR, PG, PB are arranged in a row in the column direction. In the same way, the center of luminance of the display pixel can be moved in the column direction by an amount smaller than that of one pixel portion.

  FIG. 7 is a diagram illustrating an example of the case where the sub-pixel portions are arranged side by side in the column direction. FIG. 7 illustrates two pixel portions P11 and P12 that are adjacent in the column direction. The pixel part P11 is located above the pixel part P12.

  In FIG. 7, at time t1, the first sub-pixel portions PR, PG, and PB of the pixel portion P11 are used, and white is displayed without using the second sub-pixel portion PW. At time t2, white is displayed using the first sub-pixel portions PR, PG, PB and the second sub-pixel portion PW of the pixel portion P11. At time t3, the second sub-pixel portion PW of the pixel portion P11 is used, and white is displayed without using the first sub-pixel portions PR, PG, and PB. At time t4, white is displayed using the second sub-pixel unit PW of the pixel unit P11 and the first sub-pixel units PR, PG, and PB of the pixel unit P12. At time t5, the first sub-pixel part PR, PG, PB of the pixel part P12 is used, and white is displayed without using the second sub-pixel part PW.

  Also in this modified example, as shown by the dotted line in FIG. 7, by sequentially changing the configuration of the sub-pixel unit expressing white (shifting in the moving direction), the luminance centroids are arranged in an amount smaller than that of one pixel unit. Can be moved in the direction.

[4. Modification 2: Subpixels are arranged in a square shape]
In the above-described embodiment, the case where the sub-pixel portions are arranged in a row and the case where the sub-pixel portions are arranged in a row are described in the first modification. A case where the pixel portions are arranged in a matrix of 2 rows × 2 columns will be described.

  FIG. 8A and FIG. 8B are diagrams illustrating an example of the arrangement of sub-pixel units in the present modification. 8A and 8B, the sub-pixel unit corresponding to the target pixel among the plurality of display pixels constituting the image indicated by the video signal is indicated by a solid line, and the sub-pixel unit corresponding to the display pixel other than the target pixel. Is indicated by a broken line.

  FIG. 8A shows two pixel portions P21 and P22 adjacent in the row direction. The pixel portions P21 and P22 are respectively a red (R) first sub-pixel portion PR on the upper left, a white (W) second sub-pixel portion PW on the lower left, and a green (G) first sub-pixel portion PG on the upper right. The blue (B) first sub-pixel portions PB are arranged at the lower right.

  Hereinafter, for the sake of explanation, a case where a still image is displayed will be described as an example.

  At time t1, white having a predetermined luminance is displayed on the left pixel portion P21. The luminance values of the first sub-pixel portions PR, PG, PB and the second sub-pixel portion PW of the pixel portion P21 depend on the gradation value of the target pixel among the plurality of display pixels constituting the image indicated by the video signal. Brightness value.

  At time t2, the first sub-pixel portions PG and PB located on the right side of the sub-pixel portions constituting the left-side pixel portion P21 and the left-side portion of the sub-pixel portions constituting the right-side pixel portion P22 are located. The luminance values of the first sub-pixel portion PR and the second sub-pixel portion PW that are to be used are luminance values according to the gradation value of the target pixel. As a result, at time t2, the center of luminance shifts by about 0.5 pixel portion compared to the case at time t1.

  At time t3, the luminance value of the pixel unit P22 becomes a luminance value according to the gradation value of the target pixel. As a result, at time t3, the luminance center of gravity is further shifted by about 0.5 pixel portion as compared with the case at time t2.

  With this configuration, it is possible to move the gravity center of gravity by an amount smaller than that of one pixel unit.

  FIG. 8B illustrates a case where the pixel portions P21 and P23 having different sub pixel portion arrangements are alternately arranged in units of columns.

  The arrangement of the sub pixel portions in the left pixel portion P21 in FIG. 8B is the same as that in FIG. 8A. The arrangement of the sub pixel portions in the pixel portion P23 on the right side of FIG. 8B is different from the arrangement of the sub pixel portions in the pixel portion P shown in FIG. 8A. In the pixel portion P23, the white (W) second sub-pixel portion PW in the upper left, the red (R) first sub-pixel portion PR in the lower left, the blue (B) first sub-pixel portion PB in the upper right, and the lower right The green (G) first sub-pixel portions PG are respectively arranged.

  In the case of FIG. 8B, the target pixel of the image indicated by the video signal using the pixel portion P21 at time t1, the right half of the pixel portion P21 and the left half of the pixel portion P23 at time t2, and the pixel portion P23 at time t2. Is displayed. With this configuration, it is possible to move the gravity center of gravity by an amount smaller than that of one pixel unit.

  As described above, in both FIG. 8A and FIG. 8B, the luminance center of gravity is set to one pixel by adopting not only one pixel unit unit but also display using a part of a plurality of sub-pixel units belonging to a plurality of pixel units. It can be moved by an amount smaller than the part.

  Also in this modification, the combination of sub-pixel units used for white expression may be changed in the same pixel unit. In this case, the center of gravity of the brightness of the display pixel moves not only in the row direction but also in the column direction. However, since the movement in the column direction is slight, it is difficult for the user to recognize the movement of the image. It is thought that.

  8A and 8B, if a method similar to the above-described method is applied to two pixels adjacent in the column direction, the center of brightness of the wobbling in the column direction is smaller than that of one pixel unit. It can be moved with.

[5. Modification 3: Sub-pixels are arranged in a diamond shape]
In the above-described embodiment, when the sub-pixel portions are arranged in a row, in the first modification, the sub-pixel portions are arranged in one row in the first modification, and in the second modification, the sub-pixel portions are two rows. The case where they are arranged in a matrix of × 2 columns has been described. On the other hand, in this modification, a case where the sub-pixel portions are arranged in a diamond shape will be described.

  FIG. 9A and FIG. 9B are diagrams illustrating an example of the arrangement of sub-pixel units in the present modification.

  In the second modification, the pixel portions P21 to P23 are formed in a square region, but in the present modification, the pixel portions P21 to P23 are formed in a rhombus region. In other words, the row direction and the column direction are inclined by −45 degrees with respect to FIG. 8A or 8B.

  FIG. 9A shows four pixel portions P30 to P33. The four pixel portions P30 to P33 are arranged in a rhombus shape, with the pixel portion P30 on the upper side, the pixel portion P31 on the left side, the pixel portion P32 on the right side, and the pixel portion P33 on the lower side. Note that only a part of the pixel portions P30 and P33 is shown for explanation.

  The pixel portions P30 to P33 each have a first sub-pixel portion PR on the upper side, a second sub-pixel portion PW on the left side, a first sub-pixel portion PB on the lower side, and a first sub-pixel portion PG on the right side. . In FIG. 9A, the arrangement of the sub-pixel portions P30 to P33 is the same.

  In FIG. 9A, at time t1, white is displayed using the pixel portion P31. At time t2, the first sub-pixel unit PG of the pixel unit P31, the first sub-pixel unit PB of the pixel unit P30, the first sub-pixel unit PR of the pixel unit P33, and the second sub-pixel unit PW of the pixel unit P32 Are used to display white. At time t3, white is displayed using the pixel portion P32. Between time t1 and time t3, the center of luminance shifts by the amount of one pixel portion, but between time t1 and time t2 and between time t2 and time t3, the center of luminance is 0.5 pixel portion. It will deviate to some extent.

  With this configuration, it is possible to move the gravity center of gravity by an amount smaller than that of one pixel unit.

  FIG. 9B illustrates a case where two types of pixel portions having different arrangements of sub-pixel portions are alternately arranged. FIG. 9B shows four pixel portions P30, P31, P34, and P35. The four pixel portions P30 to P33 are arranged in a rhombus shape, with the pixel portion P30 on the upper side, the pixel portion P31 on the left side, the pixel portion P34 on the right side, and the pixel portion P35 on the lower side. Note that only a part of the pixel portions P30 and P35 is shown for explanation.

  9B, the arrangement of the sub-pixel parts in the pixel parts P30 and P31 is the same as the arrangement of the sub-pixel parts in the pixel parts P30 to 33 shown in FIG. 9A. In the pixel part P34 and the pixel part P35, the second sub-pixel part PW is arranged on the upper side, the first sub-pixel part PR on the left side, the first sub-pixel part PB on the right side, and the first sub-pixel part PG on the lower side. Yes.

  In FIG. 9B, at time t1, white is displayed using the pixel portion P31. At time t2, the first sub-pixel unit PG of the pixel unit P31, the first sub-pixel unit PB of the pixel unit P30, the second sub-pixel unit PW of the pixel unit P35, and the first sub-pixel unit PR of the pixel unit P34. Are used to display white. At time t3, white is displayed using the pixel portion P34. Between time t1 and time t3, the center of luminance shifts by the amount of one pixel portion, but between time t1 and time t2 and between time t2 and time t3, the center of luminance is 0.5 pixel portion. It will deviate to some extent. Therefore, also in the case of FIG. 9B, the center of gravity of the luminance can be moved by an amount smaller than that of one pixel portion.

  From the above, in both FIG. 9A and FIG. 9B, the luminance center of gravity is set to 1 by adopting not only the pixel unit unit but also the display using the plurality of sub-pixel units belonging to the plurality of pixel units (fifth display). It can be moved by a smaller amount than the pixel portion.

  Note that in this modification as well, in the same pixel portion, the combination of sub-pixel portions used for white expression may be changed in the same pixel portion.

  In this modification, the center of gravity of the luminance moves not only in the row direction but also in the column direction. However, since the movement in the column direction is slight, it is difficult for the user to recognize the movement of the image. It is believed that there is.

  Also in FIGS. 9A and 9B, by applying the above method by exchanging the row direction and the column direction, it is possible to move the luminance center of gravity by an amount smaller than that of one pixel unit in the wobbling in the column direction. it can.

[6. Effect]
As described above, in the embodiment and the first to third modifications, the center of luminance of each display pixel is moved by an amount smaller than that of one pixel unit in wobbling. As a result, it is possible to suppress degradation in video quality due to burn-in.

  Further, in the embodiment and the first to third modifications, the center of luminance of each display pixel is moved by an amount smaller than that of one pixel portion, so that it is difficult for the user to recognize the movement of the image due to wobbling.

  10A and 10B are diagrams illustrating an example of wobbling in a conventional display device. In FIGS. 10A and 10B, the position of the image is shifted in units of one pixel part (because it moves directly from the pixel part P101 to the pixel part P102), so that the user perceives the movement of the image due to wobbling. there were. On the other hand, in the above embodiment and Modifications 1 to 3, the center of luminance of each display pixel is moved by an amount smaller than that of one pixel portion, so that it is difficult for the user to recognize the movement of the image due to wobbling. It can prevent the quality from deteriorating.

  Further, in the above embodiment and Modifications 1 to 3, since the luminance value of each of the plurality of display pixels is not changed, the luminance edge in the image can be maintained and the image can be prevented from blurring.

  In the embodiment and the first to third modifications, the composite color displayed by the plurality of first sub-pixel units and the second sub-pixel unit is changed according to the center of brightness while appropriately changing the center of brightness. The distribution of the luminance distributed to the plurality of first sub-pixel units and the second sub-pixel unit is changed so that the luminance value becomes the same value as the luminance value when the image display position is not moved. Since the distribution of the luminance to be distributed is changed so that the luminance value of the composite color is the same as the luminance value when the display position of the image is not moved, the luminance edge of the image displayed on the organic EL panel 10 is blurred. Can be prevented.

  Further, in the embodiment and the first to third modifications, the calculation of the luminance values of the first sub-pixel unit and the second sub-pixel unit is realized by a simple calculation as shown in the above formulas 1 to 4. Therefore, it is possible to suppress an increase in the calculation load of the TCON 40. By using Equations 1 to 4, it is possible to sequentially move the luminance gravity center of the image by an amount smaller than that of the one pixel portion P with a simple configuration in which the luminance gravity center is substituted while being sequentially changed. For this reason, it is possible to simplify the apparatus configuration and suppress an increase in manufacturing cost.

  Furthermore, in the said embodiment and the modifications 1-3, the combination of the sub pixel part which displays a display pixel is changed as a result. Here, as shown in the embodiment and the first to third modifications, the arrangement method of the sub-pixel portion differs depending on the display device. For this reason, in general, a display device such as the organic EL display 100 is not configured to perform control in units of sub-pixel units from the outside of the display device. However, since wobbling is control executed inside the apparatus regardless of an external control signal or the like input from the outside, control in units of sub-pixel units is possible. In the display device according to the above embodiment and the first to third modifications, the wobbling that is the internal control of the display device is controlled in units of sub-pixel units, thereby maintaining the edge of the luminance of the image while maintaining the edge of the image pixel. The center of gravity of the luminance can be moved not in units of one pixel unit but in units smaller than one pixel unit P.

  Further, in the above-described embodiment and Modifications 1 to 3, the high-luminance green (G) first sub-pixel portion PG and the white (W) second sub-pixel portion PW are arranged at positions separated from each other. . When the first sub-pixel portion PG of high luminance green (G) and the second sub-pixel portion PW of white (W) are adjacent to each other, the luminance center of gravity is drawn to the center of the two pixels, and 1 It may be difficult to move the center of gravity of the luminance by an amount smaller than the pixel portion. In the above-described embodiment and Modifications 1 to 3, since the high-luminance green (G) first sub-pixel portion PG and the white (W) second sub-pixel portion PW are arranged apart from each other, The luminance center of gravity can be moved well.

(Other embodiments)
As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  (1) In the said embodiment and the modifications 1-3, although the case where the display apparatus was an organic EL display was demonstrated to the example, it does not restrict to this. The display device may be another display device such as a plasma display. Note that the above embodiment and the first to third modifications are particularly useful for a display having a large influence of image sticking, such as an organic EL display.

  (2) In the above-described embodiment and Modifications 1 to 3, the sub-pixel unit (first sub-pixel unit, second sub-pixel unit) is a sub-pixel unit using an organic EL element having a 2Tr configuration including two transistors. Although a case has been described as an example, the present invention is not limited to this. A configuration including three or more transistors such as a transistor for controlling application of a reference voltage, application of an initialization voltage, or enable, or a configuration including two or more capacitors may be used.

  (3) In the above embodiment and Modifications 1 to 3, the RGBW format display device has been described as an example, but the present invention is not limited to this. For example, a display device of the R (red) G (green) B (blue) Y (yellow, red and green combined color) format may be used. The present disclosure includes a plurality of first sub-pixel units corresponding to each of a plurality of colors, and a second sub-pixel unit corresponding to a combined color obtained by combining at least two of the plurality of colors. The present invention can be applied to any display device including a pixel portion.

  (4) The present disclosure can be realized not only as a display device but also as a display method having steps executed by a wobbling unit constituting the display device, or as a program for causing a computer to execute these steps. Or a recording medium such as a computer-readable CD-ROM in which the program is recorded, or information, data, or a signal indicating the program. These programs, information, data, and signals may be distributed via a communication network such as the Internet.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The present disclosure is applicable to a display device that performs wobbling. Specifically, the present disclosure is applicable to a plasma display, an organic EL display, a mobile phone using these, a smartphone, a tablet, and the like.

10 Organic EL Panel 20 Data Line Drive Circuit 30 Scan Line Drive Circuit 40 TCON
41 Image processing unit 42 Signal processing unit 43 Wobbling unit 44 Center of gravity determination unit 45 Brightness conversion unit 100 Organic EL display Cs Capacitance element OEL Organic EL elements P, P1, P2, P11, P12, P21, P22, P23, P30, P31, P32, P33, P34, P35, P101, P102 Pixel part PR, PG, PB First sub-pixel part PW Second sub-pixel part Trd Drive transistor Trs Select transistor

Claims (8)

A display device including a display control unit that changes a display position of an image displayed on a display panel,
Each of the plurality of pixel portions constituting the display panel is obtained by combining a plurality of first sub-pixel portions corresponding to each of a plurality of colors and at least two of the plurality of colors. A second sub-pixel portion corresponding to the color,
The display control unit moves the center of gravity of each of the plurality of display pixels constituting the image by an amount smaller than that of one pixel unit;
Display device. The display control unit, for each of the plurality of pixel units, the luminance of the composite color expressed by the plurality of first sub-pixel units and the second sub-pixel unit according to the center of gravity of the luminance after movement Changing the distribution of luminance distributed to the plurality of first sub-pixel units and the second sub-pixel unit so that the value is the same as the luminance value when the display position of the image is not moved.
The display device according to claim 1. The display control unit sequentially changes the luminance center of gravity, and changes the distribution of luminance distributed to the plurality of first sub-pixel units and the second sub-pixel unit according to the change of the luminance center of gravity,
The display device according to claim 2. The display control unit changes a combination of the plurality of first sub-pixel units and the second sub-pixel unit for displaying display pixels.
The display device according to claim 1. The display control unit
Processing for displaying display pixels on a reference pixel portion of the plurality of pixel portions;
A part of the plurality of first sub-pixel portions and the second sub-pixel portion constituting the reference pixel portion, and the plurality of first sub-pixel portions adjacent to the reference pixel portion. A combination of a process of displaying the display pixel using a part of the one sub-pixel unit and the second sub-pixel unit.
The display device according to claim 4. The display panel includes a sub-pixel unit that emits green light to the plurality of first sub-pixel units, and the second sub-pixel unit is a sub-pixel unit that emits white light. The sub-pixel unit that emits light for use and the sub-pixel unit that emits light for white are arranged so as not to be adjacent to each other.
The display apparatus of any one of Claims 1-5. The display device is an organic electroluminescence display,
The plurality of first sub-pixel portions and second sub-pixel portions have organic electroluminescence elements.
The display apparatus of any one of Claims 1-6. A display method executed by a display control unit that changes a display position of an image displayed on a display panel,
Each of the plurality of pixel portions constituting the display panel is obtained by combining a plurality of first sub-pixel portions corresponding to each of a plurality of colors and at least two of the plurality of colors. A second sub-pixel portion corresponding to the color,
The display control unit moves the center of gravity of each of the plurality of display pixels constituting the image by an amount smaller than that of one pixel unit;
Display method.

Images