Patent Grant
11889732
This application is a national stage application under 35 U.S.C. 371 and claims the benefit of PCT Application No. PCT/JP2021/013943, having an international filing date of 31 Mar. 2021, which designated the United States, which PCT application claimed the benefit of Japanese Patent Application No. 2020-064477, filed 31 Mar. 2020, the entire disclosures of each of which are incorporated herein by reference.
The present disclosure relates to a display device.
In recent years, an LED display device in which a plurality of light emitting diode elements (hereinafter referred to as “LED elements”) is two-dimensionally arranged has been widely known. In an LED display device, one pixel includes LEDs of three colors of red (R), green (G), and blue (B) (see Patent Document 1, for example).
However, in the LED display device described above, since LED elements of three colors of R, G, and B are used, there is a problem that the number of wirings on the substrate increases. In particular, in a high-resolution LED display device, since the number of LED elements increases, the problem of the number of wires becomes significant.
An object of the present disclosure is to provide a display device capable of reducing the number of wirings on a substrate and simplifying manufacturing by changing the pixel configuration.
In order to solve the above-described problem, a first disclosure provides a display device including:
According to a second disclosure, there is provided a display device including:
According to a third disclosure, there is provided a display device including:
According to a fourth disclosure, there is provided a display device including:
Embodiments of the present disclosure will be described in the following order. Note that in all the drawings of the following embodiments, the same or corresponding parts are denoted by the same reference numerals.
Since the human eye has low resolution and recognition for the color blue (less M cones), the sense of resolution is not largely affected even if blue LED elements are thinned out from pixels having LED elements of three colors of red, green, and blue. Furthermore, since the resolution and recognition for the color red is less visible than the color green, the sense of resolution is not largely affected even if red LED elements are thinned out from pixels having LED elements of three colors.
In the display device according to the first embodiment, a plurality of first pixels having LED elements of two colors of red and green and a plurality of second pixels having LED elements of two colors of green and blue are two-dimensionally arranged on the basis of the above viewpoint.
The substrate 11 is, for example, a printed circuit board (PCB). A plurality of scanning lines, a plurality of signal lines, and driver integrated circuits (IC) for controlling the plurality of SMDs 12 via the plurality of scanning lines and the plurality of signal lines are provided on the substrate 11.
The plurality of SMDs 12 is two-dimensionally arranged in a lattice shape on the substrate 11. In the following description, a row direction of the two-dimensional arrangement is referred to as an X-axis direction (first direction), and a column direction orthogonal to and intersecting the row direction is referred to as a Y-axis direction (second direction). The SMD 12 is an SMD (4 in 1 SMD) in which four pixels are integrated into one chip.
The pixel 21P1 and the pixel 21P2 include a green LED element (first LED element) 20G and a red LED element (second LED element) 20R as a set of LED elements having different colors. The pixel 22P1 and the pixel 22P2 include a green LED element (third LED element) 20G and a blue LED element (fourth LED element) 20B as a set of LED elements having different colors.
The pixels 21P and the pixels 22P are two-dimensionally arranged in a lattice shape (matrix shape) so as to be alternately arranged in the X-axis direction and alternately arranged in the Y-axis direction orthogonal to and intersecting the X-axis direction. That is, the pixels 21P and the pixels 22P are two-dimensionally arranged in a staggered manner. While
The SMD 12 is of a cathode common type in which the cathode is a common terminal. The SMD 12 includes cathode terminals (gate terminals) 24GT1 and 24GT2 which are common terminals, an anode terminal 24R1, anode terminals 24G1 and 24G2, and an anode terminal 24B1.
The cathodes of the green LED element 20G and the red LED element 20R included in the pixel 21P1 and the cathodes of the green LED element 20G and the blue LED element 20B included in the pixel 22P1 are connected to a scanning line GT1 via the common cathode terminal 24GT1. The cathodes of the green LED element 20G and the red LED element 20R included in the pixel 21P2 and the cathodes of the green LED element 20G and the blue LED element 20B included in the pixel 22P2 are connected to a scanning line GT2 via the common cathode terminal 24GT2.
The anode of the green LED element 20G included in the pixel 21P1 and the anode of the green LED element 20G included in the pixel 22P2 are connected to a signal line G1 via the anode terminal 24G1. The anode of the green LED element 20G included in the pixel 21P2 and the anode of the green LED element 20G included in the pixel 22P1 are connected to a signal line G2 via the anode terminal 24G2.
The anode of the red LED element 20R included in the pixel 21P1 and the anode of the red LED element 20R included in the pixel 21P2 are connected to a signal line R1 via the anode terminal 24R1.
The anode of the blue LED element 20B included in the pixel 22P1 and the anode of the blue LED element 20B included in the pixel 22P2 are connected to a signal line B1 via the anode terminal 24B1.
The scanning lines GT1 and GT2 are connected to gates (not illustrated) as switches. The signal lines R1, B1, G1, and G2 are connected to DC sources DC1, DC2, DC3, and DC4, respectively. In the cathode common type SMD 12, a current flows from the driver into each of the LED elements 20R, 20G, and 20B.
As described above, the display device 10 according to the first embodiment includes the plurality of pixels 21P including the green LED element 20G and the red LED element 20R, and the plurality of pixels 22P including the green LED element 20G and the blue LED element 20B. The pixels 21P and the pixels 22P are alternately arranged in the X-axis direction and alternately arranged in the Y-axis direction orthogonal to and intersecting the X-axis direction.
With the above configuration, in the display device 10, since the number of LED elements can be reduced, the number of components of the display device 10 can be reduced. Hence, the reliability of the display device 10 can be improved. Furthermore, manufacturing can be simplified by changing the pixel configuration.
Furthermore, in the display device 10, since the number of driving wirings can be reduced, the wiring rule of the substrate 11 can be relaxed, and the number of driver ICs can be reduced.
Furthermore, since the number of components and the driver ICs can be reduced as described above, the cost of the display device 10 can be reduced.
Furthermore, by reducing the number of driver ICs described above, the amount of heat generation (i.e., power consumption) of the display device 10 can be reduced, and the luminance of the display device 10 can be improved.
Since the pixels 21P1 and 21P2 are formed by thinning out the blue LED element 20B from the pixel having the LED elements 20R, 20G, and 20B of three colors, and the pixels 22P1 and 22P2 are formed by thinning out the red LED element 20R from the pixel having the LED elements 20R, 20G, and 20B of three colors, the total signal amount can be reduced to ⅔. This is equivalent to Y chrominance conversion of a video signal (RGB). Furthermore, since video signal transmission, signal processing, and the like can also be reduced to ⅔, the cost of the circuit can be reduced. Moreover, it is also possible to extend the signal transmission distance between the controller and the display unit, since a reduction in the total amount of signals can curb deterioration in signal quality.
Since both the pixel 21P and the pixel 22P have the green LED element 20G having high visibility, it is possible to curb degradation in the sense of resolution (image quality) even in a screen formed by two-dimensionally arranging a plurality of pixels 21P having only the LED elements 20G and 20R of two colors and a plurality of pixels 22P having only the LED elements 20G and 20B of two colors.
As illustrated in
In the case of the pixel configuration described above, an SMD 12 includes an anode terminal 24Y1 instead of the anode terminal 24G2 (see
Each of pixels 21P1 and 21P2 has the green LED element 20G having high visibility, and each of the pixels 22P1 and 22P2 has the yellow LED element 20Y having high visibility. As a result, it is possible to curb degradation in the sense of resolution (image quality) even in a screen formed by two-dimensionally arranging the plurality of pixels 21P1 and 21P2 having only the LED elements 20G and 20R of two colors and the plurality of pixels 22P1 and 22P2 having only the LED elements 20Y and 20B of two colors.
Furthermore, since yellow is a mixture of green and red, in a display state with low chroma such as a white display state, the pixels 22P1 and 22P2 emit light close to white, and the sense of resolution is enhanced.
As illustrated in
In the case of the pixel configuration described above, an SMD 12 includes an anode terminal 24W1 instead of the anode terminal 24G2 (see
The pixels 21P1 and 21P2 have the green LED element 20G having high visibility, and the pixels 22P1 and 22P2 have the white LED element 20W having high visibility. As a result, it is possible to curb degradation in the sense of resolution (image quality) even in a screen formed by two-dimensionally arranging the plurality of pixels 21P1 and 21P2 having only the LED elements 20G and 20R of two colors and the plurality of pixels 22P1 and 22P2 having only the LED elements 20W and 20B of two colors.
Furthermore, since white is a mixture of green, red, and blue, in a display state with low chroma such as a white display state, the pixels 22P1 and 22P2 emit light close to white, and the sense of resolution is enhanced.
As illustrated in
In the case of the above configuration, an SMD 12 further includes an anode terminal 24R2 in addition to cathode terminals 24GT1 and 24GT2, an anode terminal 24R1, anode terminals 24G1 and 24G2, and an anode terminal 24B1 (see
An SMD 12 may have a circuit configuration different from that of Modification 3. For example, as illustrated in
Similarly, the red LED elements 20R included in pixels 22P1 and 21P2 adjacent in the Y-axis direction may be connected in parallel between the signal line R1 and a scanning line GT2. Specifically, the anodes of the red LED elements 20R included in the pixels 22P1 and 21P2 adjacent in the Y-axis direction may both be connected to the signal line R1 via the anode terminal 24R1, and the cathodes of the red LED elements 20R may both be connected to the scanning line GT2 via a cathode terminal 24GT2.
Since the SMD 12 has the above-described circuit configuration, as illustrated in
In the first embodiment, an example in which the SMD 12 is of a cathode common type in which the cathode is a common terminal has been described. However, the SMD 12 may be of an anode common type in which the anode is a common terminal. In an anode common type SMD 12, the gate (switch) is provided on the common anode side of each of LED elements 20R, 20G, and 20B, switching is performed on the power supply side (high potential side), and a current is drawn from each of the LED elements 20R, 20G, and 20B by a current source on the cathode side.
The anodes of the green LED element 20G and the red LED element 20R included in a pixel 21P1 and the anodes of the green LED element 20G and the blue LED element 20B included in a pixel 22P1 are connected to a scanning line GT1 via the common anode terminal 25GT1. The anodes of the green LED element 20G and the red LED element 20R included in a pixel 21P2 and the anodes of the green LED element 20G and the blue LED element 20B included in a pixel 22P2 are connected to a scanning line GT2 via the common anode terminal 25GT2.
The cathode of the green LED element 20G included in the pixel 21P1 and the cathode of the green LED element 20G included in the pixel 22P2 are connected to a signal line G1 via the cathode terminal 25G1. The green LED element 20G of the pixel 21P2 and the cathode of the green LED element 20G of the pixel 22P1 are connected to a signal line G2 via the cathode terminal 25G2.
The cathode of the red LED element 20R included in the pixel 21P1 and the cathode of the red LED element 20R included in the pixel 21P2 are connected to a signal line R1 via the cathode terminal 25R1.
The cathode of the blue LED element 20B included in the pixel 22P1 and the cathode of the blue LED element 20B included in the pixel 22P2 are connected to a signal line B1 via the cathode terminal 25B1.
The scanning lines GT1 and GT2 are connected to gates (not illustrated) as switches. The signal lines R1, B1, G1, and G2 are connected to DC sources DC1, DC2, DC3, and DC4, respectively.
Note that in Modifications 1 to 4, too, the SMD 12 may be an anode common type instead of the cathode common type.
In the first embodiment, an example has been described in which each of the plurality of SMDs 12 includes 2×2 of the pixels 21P1 and 21P2. However, each of the plurality of SMDs 12 may include n×m of the pixels 21P1 and 21P2 (where n and m are, for example, an integer of 1 or more, preferably an integer of 2 or more, n is the number of pixels in the X-axis direction, and m is the number of pixels in the Y-axis direction.). Note that the pixel arrangement in the first embodiment corresponds to an example in which each of the number n of pixels in the X-axis direction and the number m of pixels in the Y-axis direction is two.
The substrate 111 is similar to the substrate 11 in the first embodiment except that it includes a plurality of SMDs 121 and a plurality of signal lines, a plurality of scanning lines and driver ICs, and the like for controlling the plurality of SMDs 122.
The plurality of SMDs 121 and the plurality of SMDs 122 are two-dimensionally arranged in a lattice shape (matrix shape) such that the SMDs 121 and 122 are alternately arranged in the X-axis direction and alternately arranged in the Y-axis direction. The SMDs 121 and 122 are SMDs (1 in 1 SMD) in which one pixel is integrated into one chip. In the following description, the positions of the plurality of SMDs 121 and 122 two-dimensionally arranged in a lattice shape are represented by (N, M) (where N indicates the numbers of the columns of the SMDs 121 and 122, and M indicates the numbers of the rows of the SMDs 121 and 122.).
The cathodes of a green LED element 20G and a red LED element 20R included in the SMD 121 (i.e., pixel 21P1) located at (N, M+1) are connected to a scanning line GT1 via the common cathode terminal 24GT. The cathodes of the green LED element 20G and a blue LED element 20B included in the SMD 122 (i.e., pixel 22P1) located at (N+1, M+1) are connected to the scanning line GT1 via the common cathode terminal 24GT.
The cathodes of the green LED element 20G and the red LED element 20R included in the SMD 121 (i.e., pixel 21P1) located at (N+1, M) are connected to a scanning line GT2 via the common cathode terminal 24GT. The cathodes of the green LED element 20G and the blue LED element 20B included in the SMD 122 (i.e., pixel 22P1) located at (N, M) are connected to the scanning line GT2 via the common cathode terminal 24GT.
The anode of the green LED element 20G included in the SMD 121 (i.e., pixel 21P1) located at (N, M+1) is connected to a signal line G1 via the anode terminal 24G. The anode of the red LED element 20R included in the SMD 121 (i.e., pixel 21P1) located at (N, M+1) is connected to a signal line R1 via the anode terminal 24R.
The anode of the green LED element 20G included in the SMD 122 (i.e., pixel 22P1) located at (N+1, M+1) is connected to a signal line G2 via the anode terminal 24G. The anode of the blue LED element 20B included in the SMD 122 (i.e., pixel 22P1) located at (N+1, M+1) is connected to a signal line B1 via the anode terminal 24B.
The anode of the green LED element 20G included in the SMD 121 (i.e., pixel 21P1) located at (N+1, M) is connected to the signal line G2 via the anode terminal 24G. The anode of the red LED element 20R included in the SMD 121 (i.e., pixel 21P1) located at (N+1, M) is connected to the signal line R1 via the anode terminal 24R.
The anode of the green LED element 20G included in the SMD 122 (i.e., pixel 22P1) located at (N, M) is connected to the signal line G1 via the anode terminal 24G. The anode of the blue LED element 20B included in the SMD 122 (i.e., pixel 22P1) located at (N, M) is connected to the signal line B1 via the anode terminal 24B.
As described above, the display device 110 according to the second embodiment includes the plurality of SMDs 121 each having one pixel 21P1 and the plurality of SMDs 122 each having one pixel 22P1, and the SMDs 121 and 122 are alternately arranged in the X-axis direction and alternately arranged in the Y-axis direction. Therefore, an operation and effect similar to that of the display device 10 according to the first embodiment can be obtained.
The above second embodiment describes an example in which the display device 110 includes the four pixels 21P1, 21P2, 22P1, and 22P2, which are included in one SMD 12 (see
In the second embodiment, an example in which the SMDs 121 and 122 are of the cathode common type has been described. However, the SMDs 121 and 122 may be of an anode common type.
The substrate 211 is similar to the substrate 11 in the first embodiment except that it includes a plurality of signal lines, a plurality of scanning lines and driver ICs, and the like for controlling the plurality of SMDs 212.
The display device 210 according to the third embodiment is similar to the display device 10 according to the first embodiment in points other than the above.
As described above, in the display device 210 according to the third embodiment, instead of providing the blue LED element 20B to each of the pixels 22P1 and 22P2, the blue LED 23B is arranged in the central part of the basic lattice L. As a result, the number of blue LED elements 20B can be reduced as compared with the display device 10 according to the first embodiment. Therefore, the display device 210 can be reduced in cost.
In the above-described third embodiment, an example in which the pixel 22P1 and the pixel 22P2 of the SMD 212 each include only the green LED element 20G has been described. However, as illustrated in
In a case where an SMD 212 has the above-described pixel configuration, as illustrated in
The SMD 212 may have a circuit configuration different from the above-described circuit configuration (
Similarly, the red LED elements 20R included in the pixels 22P1 and 21P2 adjacent in the Y-axis direction may be connected in parallel between the signal line R1 and the scanning line GT2. Specifically, the anodes of the red LED elements 20R included in the pixels 22P1 and 21P2 adjacent in the Y-axis direction may both be connected to the signal line R1 via the anode terminal 24R1, and the cathodes of the red LED elements 20R may both be connected to the scanning line GT2 via the cathode terminal 24GT2.
Since the SMD 212 has the above-described circuit configuration, the anode terminal 24R2 (see
In the above-described first to third embodiments, an example in which the display devices 10, 110, and 210 include the plurality of SMDs 12, 121, 122, and 212 having the plurality of LED elements 20R, 20B, and 20G has been described. However, instead of the plurality of SMDs 12, 121, 122, and 212, a plurality of chip on boards (COBs) or glue on boards (GOBs) having the plurality of LED elements 20R, 20B, and 20G may be included. A GOB includes a protective layer covering a plurality of pixels 21P and a plurality of pixels 22P on a display surface. The protective layer includes a resin layer or a film, for example.
In the above-described first to third embodiments, an example in which the plurality of SMDs 12, 121, 122, and 212 is secondarily arranged on the substrate has been described. However, the plurality of pixels 21P and the plurality of pixels 22P may be two-dimensionally arranged directly on the substrates 11, 111, and 211. In this case, the plurality of LED elements 20R, 20B, and 20G may be embedded in the substrates 11, 111, and 211. The LED elements 20R, 20B, and 20G may be micro LED elements.
In the first to third embodiments described above, an example has been described in which the pixels 21P1, 21P2, 22P1, and 22P2 (hereinafter referred to as pixel 21P1 and the like) include the red LED element 20R, the green LED element 20G, the blue LED element 20B, and the yellow LED element 20Y as light emitting units. However, the light emitting units are not limited thereto. For example, the pixel 21P1 and the like may include, instead of the red LED element 20R, a white LED element 20W and a red filter provided on the white LED element 20W, and include a red light emitting unit capable of emitting red light. The pixel 21P1 and the like may include, instead of the green LED element 20G, a white LED element 20W and a green filter provided on the white LED element 20W, and include a green light emitting unit capable of emitting green light. The pixel 21P1 and the like may include, instead of the blue LED element 20B, a white LED element 20W and a blue filter provided on the white LED element 20W, and include a blue light emitting unit capable of emitting blue light. The pixel 21P1 and the like may include, instead of the yellow LED element 20Y, a white LED element 20W and a yellow filter provided on the white LED element 20W, and include a yellow light emitting unit capable of emitting yellow light.
Furthermore, in the third embodiment, instead of the blue LED 23B, the SMD 212 may include a white LED element 20W and a blue filter provided on the white LED element 20W, and include a blue light emitting unit capable of emitting blue light.
Furthermore, a light emitting unit may have the following configuration. For example, the pixel 21P1 and the like may include a blue LED and a red light emitting element by quantum dot (QD) color conversion instead of the red LED element 20R. The pixel 21P1 and the like may include a blue LED and a green light emitting element by quantum dot (QD) color conversion instead of the green LED element 20G. The pixel 21P1 and the like may include a blue LED and a yellow light emitting element by quantum dot (QD) color conversion instead of the yellow LED element 20Y.
While embodiments and modifications of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments and modifications, and various modifications based on the technical idea of the present disclosure are possible.
For example, the configurations, methods, shapes, and the like described in the above embodiments and modifications are merely examples, and different configurations, methods, shapes, and the like may be used as necessary.
The configurations, methods, shapes, and the like of the above-described embodiments and modifications can be combined with each other without departing from the gist of the present disclosure.
Furthermore, the present disclosure can adopt the following configurations.
(1)
A display device including:
(2)
The display device according to (1), in which
(3)
The display device according to (1), in which
(4)
The display device according to (1), in which
(5)
The display device according to (1), in which
(6)
The display device according to (5), in which the red light emitting diode elements that are included in the first pixel and the second pixel adjacent to each other in the second direction are connected in parallel.
(7)
The display device according to any one of (1) to (6), further including a plurality of surface mount devices, in which
(8)
The display device according to (7), in which the number n of pixels in the first direction is two and the number m of pixels in the second direction is two.
(9)
The display device according to any one of (1) to (6), further including:
(10)
The display device according to any one of (1) to (6), further including a substrate, in which
(11)
The display device according to any one of (1) to (10), further including a protective layer that covers a plurality of the first pixels and a plurality of the second pixels.
(12)
A display device including:
The display device according to (12), in which each of the second pixels further includes a red light emitting diode element.
(14)
A display device including:
(15)
The display device according to (14), in which
(16)
The display device according to (14), in which
(17)
The display device according to (14), in which
(18)
The display device according to (14), in which
(19)
A display device including:
(20)
The display device according to (19), in which
| Number | Date | Country | Kind |
|---|---|---|---|
| 2020-064477 | Mar 2020 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2021/013943 | 3/31/2021 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2021/201139 | 10/7/2021 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20110199474 | Wang | Aug 2011 | A1 |
| 20120175650 | Tomiyoshi | Jul 2012 | A1 |
| 20150015466 | Feng | Jan 2015 | A1 |
| 20150201479 | Braunstein | Jul 2015 | A1 |
| 20160240593 | Gu | Aug 2016 | A1 |
| 20170084671 | Hack et al. | Mar 2017 | A1 |
| 20170278904 | Park | Sep 2017 | A1 |
| 20180069059 | Hack et al. | Mar 2018 | A1 |
| 20180166512 | Hack | Jun 2018 | A1 |
| 20190081113 | Gu et al. | Mar 2019 | A1 |
| 20200402440 | Takasugi | Dec 2020 | A1 |
| 20210383767 | Tomizawa | Dec 2021 | A1 |
| 20230076449 | Luty | Mar 2023 | A1 |
| Number | Date | Country |
|---|---|---|
| 103366683 | Oct 2013 | CN |
| 103474001 | Dec 2013 | CN |
| 104885141 | Sep 2015 | CN |
| 105989793 | Oct 2016 | CN |
| 106549034 | Mar 2017 | CN |
| 108492723 | Sep 2018 | CN |
| 208753326 | Apr 2019 | CN |
| 110620135 | Dec 2019 | CN |
| 2001-075508 | Mar 2001 | JP |
| 2006-292858 | Oct 2006 | JP |
| 2012-212152 | Nov 2012 | JP |
| 2015-018242 | Jan 2015 | JP |
| 2016-537688 | Dec 2016 | JP |
| 10-2015-0007992 | Jan 2015 | KR |
| 10-2017-0034307 | Mar 2017 | KR |
| 201503343 | Jan 2015 | TW |
| WO 2015062110 | May 2015 | WO |
| WO-2019216196 | Nov 2019 | WO |
| WO 2020093948 | May 2020 | WO |
| Entry |
|---|
| International Search Report and Written Opinion prepared by the Japan Patent Office dated Jun. 16, 2021, for International Application No. PCT/JP2021/013943, 3 pgs. |
| Number | Date | Country | |
|---|---|---|---|
| 20230124835 A1 | Apr 2023 | US |
