Light-emitting substrate, display device, splicing screen display device and method for operating display device

Abstract

A light emitting substrate is provided. The light emitting substrate includes a plurality of types of light emitting elements. The different types of light emitting elements are configured to emit light of the same color but different wavelength ranges. Each of the plurality of types of light emitting elements is substantially uniformly distributed in the light emitting substrate.

Description

Technical Field

[0001] The present invention relates to display technology, and in particular to a light-emitting substrate, a display device, a spliced ​​screen display device, and a method for operating the display device. Background Art

[0002] Mini light-emitting diodes (mini LEDs) refer to light-emitting diodes with a size between 80μm and 300μm. Mini LEDs can be used in self-luminous LED displays, or as backlight modules for display panels (such as liquid crystal display panels). Compared with related light-emitting diodes, mini LEDs achieve higher resolution. Compared with traditional edge-type light-emitting diode backlight modules, direct-type mini LED backlight modules can reduce the light mixing distance through denser chip arrangement, thereby realizing ultra-thin backlight modules. Through proper local dimming control, mini LEDs can achieve better contrast and high dynamic range (HDR) image display effects. Summary of the invention

[0003] On the one hand, the present disclosure provides a light-emitting substrate, comprising multiple types of light-emitting elements; wherein different types of light-emitting elements are configured to emit light of the same color but different wavelength ranges; and each type of light-emitting element among the multiple types of light-emitting elements is basically uniformly distributed in the light-emitting substrate.

[0004] Optionally, the different types of light emitting elements are configured to emit blue light but in different wavelength ranges.

[0005] Optionally, the respective percentages of each type of light emitting elements in each of the plurality of regions of the light emitting substrate are substantially the same; and each of the plurality of regions of the light emitting substrate comprises at least 10 light emitting elements.

[0006] Optionally, the light emitting elements of the light emitting substrate are arranged in an array comprising a plurality of rows and a plurality of columns; and the plurality of types of light emitting elements are alternately arranged in at least one row of the array.

[0007] Optionally, the multiple types of light emitting elements are arranged alternately in each row of the array.

[0008] Optionally, the light emitting elements of the light emitting substrate are arranged in an array including a plurality of rows and a plurality of columns; and the plurality of types of light emitting elements are alternately arranged in at least one column of the array.

[0009] Optionally, the multiple types of light emitting elements are arranged alternately in each column of the array.

[0010] Optionally, the light emitting elements of the light emitting substrate are arranged in an array including a plurality of rows and a plurality of columns; and the plurality of types of light emitting elements are alternately arranged in at least one row of the array and in at least one column of the array.

[0011] Optionally, the plurality of types of light emitting elements are alternately arranged in each row of the array and in each column of the array.

[0012] Optionally, the light emitting substrate includes N types of light emitting elements, N is an integer greater than or equal to 2; and the percentage of the nth type of light emitting elements in each of the multiple regions of the light emitting substrate is substantially the same, 2≤n≤N.

[0013] Optionally, the light-emitting substrate comprises a first type of light-emitting elements and a second type of light-emitting elements; wherein the first type of light-emitting elements and the second type of light-emitting elements are configured to emit blue light.

[0014] Optionally, the first type of light emitting elements are configured to emit blue light with a wavelength in the range of 447nm to 448nm; and the second type of light emitting elements are configured to emit blue light with a wavelength in the range of 452nm to 453nm.

[0015] On the other hand, the present disclosure provides a display device including the light emitting substrate described herein and a display panel configured to receive light emitted from the light emitting substrate.

[0016] Optionally, the display device also includes a color conversion layer; wherein the color conversion layer includes: a plurality of color conversion blocks, which are configured to convert the light emitted from the light-emitting substrate into light of different colors; and a plurality of light-transmitting blocks, which are configured to allow the light emitted from the light-emitting substrate to pass through without color conversion.

[0017] Optionally, the display device further comprises one or more driving circuits configured to adjust driving currents respectively provided to the plurality of types of light emitting elements.

[0018] On the other hand, the present disclosure provides a spliced ​​screen display device, comprising: a plurality of display units; wherein the plurality of display units comprise a plurality of display panels and a plurality of light-emitting substrates configured to provide light to the plurality of display panels; each of the plurality of display units comprises a corresponding display panel among the plurality of display panels and a corresponding light-emitting substrate among the plurality of light-emitting substrates; and the plurality of display panels are spliced ​​together to display images; wherein the corresponding light-emitting substrate comprises a plurality of types of light-emitting elements; wherein different types of light-emitting elements are configured to emit light of the same color but different wavelength ranges; and each type of light-emitting element among the plurality of types of light-emitting elements is substantially uniformly distributed in the light-emitting substrate.

[0019] Optionally, the multiple display units also include multiple color conversion layers, which are configured to convert light emitted from the multiple light-emitting substrates; each display unit in the multiple display units includes a corresponding color conversion layer in the multiple color conversion layers; the corresponding color conversion layer includes: a plurality of color conversion blocks, which are configured to convert the light emitted from the light-emitting substrate into light of different colors; and a plurality of light-transmitting blocks, which are configured to allow the light emitted from the light-emitting substrate to pass through without color conversion.

[0020] Optionally, each display unit also includes one or more driving circuits, which are configured to adjust the driving current provided to the multiple types of light-emitting elements respectively; and the one or more driving circuits are configured to independently adjust the driving current provided to the multiple types of light-emitting elements for each of the multiple types.

[0021] Optionally, the multiple display units include multiple types of driving circuits; each display unit includes a corresponding driving circuit of each type; the driving current in each of the multiple display units is independently adjusted by the multiple types of driving circuits; and the color coordinates of light emitted from each of the multiple display units are independently adjusted by the multiple types of driving circuits.

[0022] On the other hand, the present disclosure provides a method for operating a display device, wherein the display device includes a light-emitting substrate and a display panel configured to receive light emitted from the light-emitting substrate; wherein the light-emitting substrate includes multiple types of light-emitting elements; and each type of the multiple types of light-emitting elements is substantially uniformly distributed in the light-emitting substrate; wherein the method includes: adjusting driving currents respectively provided to the multiple types of light-emitting elements; and driving different types of light-emitting elements to emit light of the same color but different wavelength ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] According to various disclosed embodiments, the following drawings are examples only for illustration purposes and are not intended to limit the scope of the present invention.

[0024] Figure 1 is a schematic diagram showing the structure of a related display device.

[0025] Figure 2 It is a schematic diagram showing the structure of a related splicing screen display device.

[0026] Figure 3 The color difference observed in the relevant spliced ​​screen display device is shown.

[0027] Figure 4 A shows the absorption spectrum of the green quantum dot material.

[0028] Figure 4 B shows the absorption spectrum of the red quantum dot material.

[0029] Figure 4 C shows the photoluminescence spectrum of the green quantum dot material.

[0030] Figure 4 D shows the photoluminescence spectrum of the red quantum dot material.

[0031] Figure 5 The spectrum of light generated by the light emitting substrate and the color conversion layer in some embodiments according to the present disclosure is shown.

[0032] Figure 6 The color coordinates of light generated by the light emitting substrate and the color conversion layer in some embodiments according to the present disclosure are shown.

[0033] Figure 7 The color coordinate transitions in some embodiments according to the present disclosure are shown.

[0034] Figure 8 is a schematic diagram showing the structure of a display device in some embodiments of the present disclosure.

[0035] Fig. 9 is a schematic diagram showing the structure of a light-emitting substrate in some embodiments of the present disclosure.

[0036] Fig.10 is a schematic diagram showing the structure of a light-emitting substrate in some embodiments of the present disclosure.

[0037] Fig.11 is a schematic diagram showing the structure of a light-emitting substrate in some embodiments of the present disclosure.

[0038] Fig.12 is a schematic diagram showing the structure of a light-emitting substrate in some embodiments of the present disclosure.

[0039] Fig.13 A is a plan view of a light emitting substrate according to some embodiments of the present disclosure.

[0040] Fig.13 B is a cross-sectional view of a light emitting substrate according to some embodiments of the present disclosure.

[0041] Fig.13 C is a cross-sectional view of a light emitting substrate according to some embodiments of the present disclosure.

[0042] Fig.14A is a schematic diagram showing the structure of a first color conversion block according to some embodiments of the present disclosure.

[0043] Fig. 14B is a schematic diagram showing the structure of a second color conversion block according to some embodiments of the present disclosure.

[0044] Fig. 14C is a schematic diagram showing the structure of a light-transmitting block in some embodiments of the present disclosure.

[0045] Fig.15 is a schematic diagram showing the structure of a corresponding display unit in some embodiments of the present disclosure.

[0046] Fig.16 is a schematic diagram showing the structure of a spliced ​​screen display device according to some embodiments of the present disclosure.

[0047] Fig.17 is a circuit diagram showing the structure of a corresponding pixel driving circuit in some embodiments according to the present disclosure. DETAILED DESCRIPTION

[0048] The present disclosure will now be described in more detail with reference to the following examples. It should be noted that the following description of some of the embodiments presented herein is for illustration and description purposes only. It is not intended to be exhaustive or limited to the precise form disclosed.

[0049] LCD splicing screens have been developed, especially those combined with mini LED backlights. When mini LED backlights are used in combination with LCD splicing screens, high color gamut and high dynamic contrast can be achieved using local dimming technology.

[0050] Figure 1 Schematic diagram showing the structure of a related display device. Figure 1In some embodiments, the display device includes a backlight BL, a light diffusion plate LD located on the backlight BL, a color conversion layer CCL located on a side of the light diffusion plate LD away from the backlight BL, a light enhancement layer LEL located on a side of the color conversion layer CCL away from the backlight BL, and a display panel DP located on a side of the light enhancement layer LEL away from the backlight BL. In some embodiments, the display panel DP is a liquid crystal display panel. In some embodiments, the color conversion layer CCL is a quantum dot color conversion layer including one or more quantum dot materials. Optionally, the color conversion layer CCL is a color conversion film. In some embodiments, the light enhancement layer LEL includes a dual brightness enhancement film (DBEF). In some embodiments, the light enhancement layer LEL includes a prism layer including a plurality of prisms.

[0051] Figure 2 Schematic diagram showing the structure of a related splicing screen display device. Figure 2 , the spliced ​​screen display device includes a plurality of display panels spliced ​​together. The inventors of the present disclosure have found that the color characteristics of light converted by the color conversion layer in the relevant display device fluctuate due to various factors, including the composition of the quantum dot material, the material of the barrier film used in the color conversion layer, the amount of adhesive used in the manufacturing process, and the coating uniformity. Because the relevant spliced ​​screen display device includes a plurality of display panels spliced ​​together, and each display panel has its own color conversion layer. The difference between the color characteristics of light converted by the color conversion layers in the plurality of display panels leads to color differences between the plurality of display panels, especially when the color conversion layers in the plurality of display panels are manufactured in different batches. Figure 3 The color difference observed in the relevant spliced ​​screen display device is shown. Figure 3 , display panels 1, 3, 5, 6 and 7 show a color shift toward yellow.

[0052] Therefore, the present disclosure provides, in particular, a light-emitting substrate, a display device, a spliced ​​screen display device, and a method for operating a display device, which substantially eliminates one or more problems caused by the limitations and disadvantages of the prior art. On the one hand, the present disclosure provides a light-emitting substrate. In some embodiments, the light-emitting substrate includes multiple types of light-emitting elements. Optionally, different types of light-emitting elements are configured to emit light of the same color but different wavelength ranges. Optionally, each type of light-emitting element in the multiple types of light-emitting elements is substantially uniformly distributed in the light-emitting substrate.

[0053] The inventors of the present disclosure discovered that light absorption by a color conversion material (eg, quantum dot material) in a color conversion layer depends on the wavelength of light (eg, blue light) impinging on the color conversion material. Figure 4 A shows the absorption spectrum of green quantum dot material. Figure 4 A, the light absorption of the green quantum dot material depends on the wavelength of the light (e.g., blue light) irradiated on the green quantum dot material in the color conversion layer. The smaller the wavelength of blue light, the higher the absorption, and thus the higher the excitation of the green quantum dot material, resulting in converted light with a color shift toward green.

[0054] Figure 4 B shows the absorption spectrum of the red quantum dot material. Figure 4 B, the light absorption of the red quantum dot material depends on the wavelength of the light (e.g., blue light) irradiated on the red quantum dot material in the color conversion layer. The smaller the wavelength of blue light, the higher the absorption, so the higher the excitation of the red quantum dot material, resulting in converted light with a color shift toward green.

[0055] In some embodiments, the color conversion layer includes both green quantum dot material and red quantum dot material. The color conversion layer optionally also includes a plurality of light-transmitting regions that allow blue light to pass through without color conversion. The red light converted by the red quantum dot material, the green light converted by the green quantum dot material, and the blue light that passes through without color conversion are mixed together to produce white light. Figure 4 A and Figure 4 B, when the quantum dot material is excited by blue light with a relatively short wavelength, the white light generated by the color conversion layer has a color shift toward yellow. When the quantum dot material is excited by blue light with a relatively long wavelength, the white light generated by the color conversion layer has a color shift toward blue.

[0056] Figure 4 C shows the photoluminescence spectrum of green quantum dot material. Figure 4 C. In one example, the photoluminescence spectrum of the green quantum dot material has a peak wavelength of 558 nm and a full width at half maximum of 44 nm. Figure 4 D shows the photoluminescence spectrum of the red quantum dot material. Figure 4 D. In one example, the photoluminescence spectrum of the red quantum dot material has a peak wavelength of 632 nm and a half-peak width of 60 nm.

[0057] Figure 5 Spectra of light generated by a light-emitting substrate and a color conversion layer in some embodiments according to the present disclosure are shown. Figure 5, the solid line (white light 1) represents the spectrum of light generated by the light-emitting substrate and the color conversion layer when blue light with a relatively short wavelength is used to excite the quantum dot material in the color conversion layer; the dotted line (white light 2) represents the spectrum of light generated by the light-emitting substrate and the color conversion layer when blue light with a relatively long wavelength is used to excite the quantum dot material in the color conversion layer. When blue light with a relatively short wavelength is used to excite the quantum dot material in the color conversion layer, the proportion of red light and green light in the white light spectrum increases (for example, increases by 10%), while the proportion of blue light in the white light spectrum decreases (for example, decreases by 10%). When blue light with a relatively long wavelength is used to excite the quantum dot material in the color conversion layer, the proportion of red light and green light in the white light spectrum decreases (for example, decreases by 10%), while the proportion of blue light in the white light spectrum increases (for example, increases by 10%).

[0058] In some embodiments, the color coordinates of the spectrum can be calculated according to the following formula:

[0059] x=X / (X+Y+Z); and y=Y*(X+Y+Z);

[0060] in,

[0061] as well as

[0062]

[0063] in, denotes a spectrum; and x(λ), y(λ), and z(λ) denote tristimulus values.

[0064] Figure 6 Graphs 1 and 2 show the color coordinates of light generated by the light-emitting substrate and the color conversion layer in some embodiments of the present disclosure. Figure 6 The color coordinates of white light 1 (light generated by the light-emitting substrate and the color conversion layer when blue light with a relatively short wavelength is used to excite the quantum dot material in the color conversion layer) correspond to a color shift toward yellow; the color coordinates of white light 2 (light generated by the light-emitting substrate and the color conversion layer when blue light with a relatively long wavelength is used to excite the quantum dot material in the color conversion layer) correspond to a color shift toward blue.

[0065] Figure 7 2 shows the color coordinate transformation in some embodiments according to the present disclosure. Figure 7 , the color coordinates of white light 1 and white light 2 are as described above. White light 3 represents the color coordinates of light generated by the light-emitting substrate and the color conversion layer when a mixed blue light including a relatively short wavelength blue light and a relatively long wavelength blue light is used to excite the quantum dot material in the color conversion layer. Figure 7As shown, the color coordinates of white light 3 are between the color coordinates of white light 1 and the color coordinates of white light 2. The color of the white light changes from yellowish at point A to bluish at point B, as shown by the accompanying rectangle.

[0066] The inventors of the present disclosure have discovered that by using a light-emitting substrate having multiple types of light-emitting elements (e.g., a first type of light-emitting element and a second type of light-emitting element), the light-emitting substrate can generate mixed light including light of multiple wavelength ranges (e.g., mixed blue light including blue light with a relatively short wavelength and blue light with a relatively long wavelength). By adjusting the driving currents respectively provided to the multiple types of light-emitting elements (e.g., the driving currents respectively provided to the first type of light-emitting element and the second type of light-emitting element), the proportion of light of multiple wavelength ranges in the mixed light (e.g., the proportion of blue light with a relatively short wavelength and blue light with a relatively long wavelength in the mixed blue light) can be adjusted to generate mixed light with target color coordinates.

[0067] Reference Figure 3 , the color difference between the multiple display panels in the relevant splicing screen display device is observed, for example, the display panels 1, 3, 5, 6 and 7 present a color shift to yellow. The inventors of the present disclosure have found that the color difference problem between the multiple display panels can be corrected by using a light-emitting substrate including multiple types of light-emitting elements. Specifically, the color coordinates of the multiple display panels can be adjusted by adjusting the driving current provided to the multiple types of light-emitting elements to achieve substantially uniform color coordinates between the multiple display panels. For example, the light-emitting substrate for multiple display panels in the relevant splicing screen display device can be replaced by a light-emitting substrate according to the present disclosure. For display panels 1, 3, 5, 6 and 7 (which present a color shift to yellow), the driving current provided to the first type of light-emitting element can be reduced and / or the driving current provided to the second type of light-emitting element can be increased to adjust the color coordinates of the light emitted from the display panels 1, 3, 5, 6 and 7 until the color coordinates are substantially the same as the color coordinates of the light emitted from the display panels 2, 4, 8 and 9.

[0068] Figure 8 Schematic diagram showing the structure of a display device in some embodiments of the present disclosure. Figure 8In some embodiments, the display device includes a light emitting substrate LES, a light diffusion plate LD located on the light emitting substrate LES, a color conversion layer CCL located on a side of the light diffusion plate LD away from the light emitting substrate LES, a light enhancement layer LEL located on a side of the color conversion layer CCL away from the light emitting substrate LES, and a display panel DP located on a side of the light enhancement layer LEL away from the light emitting substrate LES. In some embodiments, the display panel DP is a liquid crystal display panel. In some embodiments, the color conversion layer CCL is a quantum dot color conversion layer including one or more quantum dot materials. Optionally, the color conversion layer CCL is a color conversion film. In some embodiments, the light enhancement layer LEL includes a dual brightness enhancement film. In some embodiments, the light enhancement layer LEL includes a prism layer including a plurality of prisms. Figure 8 The display device shown in may be part of a spliced ​​screen display device.

[0069] The inventors of the present disclosure have found that, surprisingly and unexpectedly, by using a unique light-emitting substrate according to the present disclosure, the color difference between multiple display panels can be reduced or eliminated. In some embodiments, the light-emitting substrate includes multiple types of light-emitting elements. For example, the light-emitting substrate includes a first type of light-emitting element and a second type of light-emitting element. The light emitted from different types of light-emitting elements has the same color but different wavelength ranges. In one example, the light emitted from different types of light-emitting elements has a blue color, but has different wavelength ranges. As used herein, the term "same color" does not mean the same wavelength or the same wavelength range.

[0070] In some embodiments, the light emitting substrate includes N types of light emitting elements, where N is an integer greater than or equal to 2. In one example, N=2. In another example, N=3. In another example, N=4.

[0071] In some embodiments, each type of light-emitting element in a plurality of types of light-emitting elements is substantially uniformly distributed in the light-emitting substrate. As used herein, the term "substantially uniformly distributed" means that the respective percentages of the respective types of light-emitting elements in each of the plurality of regions of the light-emitting substrate are substantially the same. As used herein, the term "substantially the same" means that the difference between two values ​​does not exceed 20% of a base value (e.g., one of the two values), such as no more than 18% of the base value, no more than 16%, no more than 14%, no more than 12%, no more than 10%, no more than 8%, no more than 6%, no more than 4%, no more than 2%, no more than 1%, no more than 0.5%, no more than 0.1%, no more than 0.05%, and no more than 0.01%.

[0072] In some embodiments, each of the multiple regions of the light-emitting substrate includes at least 10 light-emitting elements, for example, at least 15 light-emitting elements, at least 20 light-emitting elements, at least 25 light-emitting elements, at least 30 light-emitting elements, at least 35 light-emitting elements, at least 40 light-emitting elements, at least 45 light-emitting elements, at least 50 light-emitting elements, at least 55 light-emitting elements, at least 60 light-emitting elements, at least 65 light-emitting elements, at least 70 light-emitting elements, at least 75 light-emitting elements, at least 80 light-emitting elements, at least 85 light-emitting elements, at least 90 light-emitting elements, at least 95 light-emitting elements or at least 100 light-emitting elements.

[0073] In some embodiments, the plurality of regions have substantially the same number of light emitting elements. In some embodiments, the plurality of regions have substantially the same size. In some embodiments, the plurality of regions have substantially the same shape.

[0074] In another example, the light-emitting substrate includes N types of light-emitting elements, N being an integer greater than or equal to 2. The percentage of the nth type of light-emitting element in each of the multiple regions of the light-emitting substrate is substantially the same, 2≤n≤N. In some embodiments, the corresponding percentages of the N types of light-emitting elements in each of the multiple regions of the light-emitting substrate are expressed as p1, p2, ..., pn, p(n+1), ..., pN. In one example, at least two of p1, p2, ..., pn, p(n+1), ..., pN are different from each other. In another example, p1, p2, ..., pn, p(n+1), ..., pN are substantially the same.

[0075] In some embodiments, the light-emitting substrate includes a first type of light-emitting element and a second type of light-emitting element. In one example, the percentage of the first type of light-emitting element in each of the multiple regions of the light-emitting substrate is in the range of 40% to 60%; and the percentage of the second type of light-emitting element in each of the multiple regions of the light-emitting substrate is in the range of 40% to 60%. In another example, the percentage of the first type of light-emitting element in each of the multiple regions of the light-emitting substrate is 50%; and the percentage of the second type of light-emitting element in each of the multiple regions of the light-emitting substrate is 50%. In one example, the percentage of the first type of light-emitting element in each of the multiple regions of the light-emitting substrate and the percentage of the second type of light-emitting element in each of the multiple regions of the light-emitting substrate are substantially the same. In another example, the percentage of the first type of light-emitting element in each of the multiple regions of the light-emitting substrate and the percentage of the second type of light-emitting element in each of the multiple regions of the light-emitting substrate are different from each other.

[0076] In some embodiments, the light-emitting elements of the light-emitting substrate are arranged in an array including multiple rows and multiple columns. In some embodiments, multiple types of light-emitting elements are alternately arranged in at least one row of the array. Optionally, multiple types of light-emitting elements are alternately arranged in each row of the array. In one example, the light-emitting substrate includes a first type of light-emitting element, a second type of light-emitting element, and a third type of light-emitting element; and the first type of light-emitting element, the second type of light-emitting element, and the third type of light-emitting element are alternately arranged in at least one row of the array. In another example, the light-emitting substrate includes a first type of light-emitting element and a second type of light-emitting element; and the first type of light-emitting element and the second type of light-emitting element are alternately arranged in at least one row of the array.

[0077] In some embodiments, multiple types of light-emitting elements are alternately arranged in at least one column of the array. Optionally, multiple types of light-emitting elements are alternately arranged in each column of the array. In one example, the light-emitting substrate includes a first type of light-emitting element, a second type of light-emitting element, and a third type of light-emitting element; and the first type of light-emitting element, the second type of light-emitting element, and the third type of light-emitting element are alternately arranged in at least one column of the array. In another example, the light-emitting substrate includes a first type of light-emitting element and a second type of light-emitting element; and the first type of light-emitting element and the second type of light-emitting element are alternately arranged in at least one column of the array.

[0078] In some embodiments, multiple types of light-emitting elements are alternately arranged in at least one row of the array and in at least one column of the array. Optionally, multiple types of light-emitting elements are alternately arranged in each row of the array and in each column of the array. In one example, the light-emitting substrate includes a first type of light-emitting element, a second type of light-emitting element, and a third type of light-emitting element; the first type of light-emitting element, the second type of light-emitting element, and the third type of light-emitting element are alternately arranged in at least one row of the array; and the first type of light-emitting element, the second type of light-emitting element, and the third type of light-emitting element are alternately arranged in at least one column of the array. In another example, the light-emitting substrate includes a first type of light-emitting element and a second type of light-emitting element; the first type of light-emitting element and the second type of light-emitting element are alternately arranged in at least one row of the array; and the first type of light-emitting element and the second type of light-emitting element are alternately arranged in at least one column of the array.

[0079] Fig. 9 Schematic diagram showing the structure of a light-emitting substrate in some embodiments of the present disclosure. Fig. 9In some embodiments, the light-emitting substrate includes a first type of light-emitting element le1 and a second type of light-emitting element le2. The first type of light-emitting element le1 and the second type of light-emitting element le2 are alternately arranged in at least one row of the light-emitting element array. The first type of light-emitting element le1 and the second type of light-emitting element le2 are alternately arranged in at least one column of the light-emitting element array. Fig. 9 As shown, the first type of light emitting element le1 and the second type of light emitting element le2 are alternately arranged in each row and each column of the light emitting element array. The light emitted from the first type of light emitting element le1 and the second type of light emitting element le2 has the same color but different wavelength ranges. In one example, the light emitted from the first type of light emitting element le1 is blue light with a wavelength in the range of 447nm to 448nm, and the light emitted from the second type of light emitting element le2 is blue light with a wavelength in the range of 452nm to 453nm. The inventors of the present disclosure have found that by distributing multiple types of light emitting elements substantially evenly, the color difference between multiple display panels can be reduced or eliminated.

[0080] Fig.10 Schematic diagram showing the structure of a light-emitting substrate in some embodiments of the present disclosure. Fig.10 In some embodiments, the light-emitting substrate includes a first type of light-emitting element le1, a second type of light-emitting element le2, and a third type of light-emitting element le3. The first type of light-emitting element le1, the second type of light-emitting element le2, and the third type of light-emitting element le3 are alternately arranged in at least one row of the light-emitting element array. The first type of light-emitting element le1, the second type of light-emitting element le2, and the third type of light-emitting element le3 are alternately arranged in at least one column of the light-emitting element array. Fig.10 As shown, the first type of light emitting element le1, the second type of light emitting element le2, and the third type of light emitting element le3 are alternately arranged in each row and each column of the light emitting element array. The light emitted from the first type of light emitting element le1, the second type of light emitting element le2, and the third type of light emitting element le3 has the same color but different wavelength ranges. The inventors of the present disclosure have found that by distributing multiple types of light emitting elements substantially uniformly, the color difference between multiple display panels can be reduced or eliminated.

[0081] Various suitable embodiments may be practiced in the present disclosure to achieve substantially uniform distribution of multiple types of light emitting elements. Fig.11 Schematic diagram showing the structure of a light-emitting substrate in some embodiments of the present disclosure. Fig.11In some embodiments, the light-emitting substrate includes a first type of light-emitting element le1 and a second type of light-emitting element le2. The first type of light-emitting element le1 and the second type of light-emitting element le2 are not alternately arranged in any row of the light-emitting element array. The first type of light-emitting element le1 and the second type of light-emitting element le2 are not alternately arranged in any column of the light-emitting element array. However, because the percentage of the first type of light-emitting element in each of the multiple regions of the light-emitting substrate is substantially the same, the first type of light-emitting element le1 is substantially uniformly distributed; and because the percentage of the second type of light-emitting element in each of the multiple regions of the light-emitting substrate is substantially the same, the second type of light-emitting element le2 is substantially uniformly distributed. Fig.11 Regions are indicated by dashed lines.

[0082] In some embodiments, multiple types of light emitting elements are arranged alternately on diagonals along at least a first direction of the array. Optionally, multiple types of light emitting elements are arranged alternately on diagonals along the first direction of the array and alternately on diagonals along the second direction of the array. Fig.11 The first type light emitting elements 1e1 and the second type light emitting elements 1e2 are alternately arranged on a diagonal line along a first direction DR1 of the array, and are alternately arranged on a diagonal line along a second direction DR2 of the array.

[0083] Fig.12 Schematic diagram showing the structure of a light-emitting substrate in some embodiments of the present disclosure. Fig.12 In some embodiments, the light-emitting substrate includes a first type of light-emitting element le1, a second type of light-emitting element le2, and a third type of light-emitting element le3. The first type of light-emitting element le1, the second type of light-emitting element le2, and the third type of light-emitting element le3 are alternately arranged in at least one row of the light-emitting element array. The first type of light-emitting element le1, the second type of light-emitting element le2, and the third type of light-emitting element le3 are not alternately arranged in any column of the light-emitting element array. However, because the percentage of the first type of light-emitting element le1 in each of the multiple regions of the light-emitting substrate is substantially the same, the first type of light-emitting element le1 is substantially uniformly distributed; because the percentage of the second type of light-emitting element le2 in each of the multiple regions of the light-emitting substrate is substantially the same, the second type of light-emitting element le2 is substantially uniformly distributed; and because the percentage of the third type of light-emitting element le3 in each of the multiple regions of the light-emitting substrate is substantially the same, the third type of light-emitting element le3 is substantially uniformly distributed. Fig.12 Regions are indicated by dashed lines.

[0084] Reference Fig.12The first type light emitting elements le1, the second type light emitting elements le2 and the third type light emitting elements le3 are alternately arranged on a diagonal line along a first direction DR1 of the array, and are alternately arranged on a diagonal line along a second direction DR2 of the array.

[0085] Fig.13 A is a plan view of a light emitting substrate according to some embodiments of the present disclosure. Fig.13 B is a cross-sectional view of a light emitting substrate according to some embodiments of the present disclosure. Fig.13 C is a cross-sectional view of a light-emitting substrate in some embodiments of the present disclosure. The arrangement of multiple types of light-emitting elements is similar to Fig. 9 Along the row direction DRx, the light emitting elements have a first pitch (in Fig.13 Along the column direction DRy, the light emitting elements have a second pitch (in Fig.13 Along the row direction DRx, two adjacent first-type light-emitting elements are spaced apart by twice the first pitch (in Fig.13 B is represented as "X pitch * 2"), and two adjacent second-type light-emitting elements are spaced at twice the first pitch (in Fig.13 C is represented as "X spacing * 2").

[0086] The light emitting substrate LES is separated from the display panel DP by a distance H. To ensure that the display panel has no mura, the first distance and the distance H satisfy H / (2*(first distance))>0.5; the second distance and the distance H satisfy H / (2*(second distance))>0.5.

[0087] On the other hand, the present disclosure provides a display device. In some embodiments, the display device includes the light-emitting substrate described herein and a display panel configured to receive light emitted from the light-emitting substrate. In some embodiments, the display device also includes one or more drive circuits. In some embodiments, the one or more drive circuits are configured to adjust the drive currents provided to multiple types of light-emitting elements respectively (for example, the drive currents provided to the first type of light-emitting elements and the second type of light-emitting elements respectively). By adjusting the drive currents provided to the multiple types of light-emitting elements respectively, the proportion of light of multiple wavelength ranges in the mixed light (for example, the proportion of blue light with a relatively short wavelength and blue light with a relatively long wavelength in the mixed blue light) can be adjusted to produce a mixed light with a target color coordinate.

[0088] In some embodiments, the display device further comprises a color conversion layer. In some embodiments, the color conversion layer comprises a plurality of color conversion blocks and a plurality of light-transmitting blocks, the plurality of color conversion blocks being configured to convert light emitted from the light-emitting substrate into light of different colors, and the plurality of light-transmitting blocks being configured to allow light emitted from the light-emitting substrate to be transmitted through without color conversion.

[0089] Fig.14A is a schematic diagram showing the structure of the first color conversion block according to some embodiments of the present disclosure. Fig.14A , the first color conversion block CCB1 is a color conversion block configured to convert light of a third color (e.g., blue light) into light of a first color (e.g., red light). In some embodiments, the first color conversion block includes a first matrix MS1, a plurality of first scattering particles SP1 dispersed in the first matrix MS1, and a plurality of first quantum dots QD1. The first matrix MS1 may include a polymer material, such as an organic polymer material. Examples of suitable polymer materials for preparing the first matrix MS1 include epoxy resins, acrylic resins, polyurethane resins, silicone resins, and silane resins. Examples of suitable materials for preparing the plurality of first scattering particles SP1 include TiO2, ZnO, ZrO2, Al2O3, SiO2. Examples of suitable quantum dot materials for manufacturing the plurality of first quantum dots QD1 include quantum dot materials of the first color (e.g., red). The quantum dot material may include a material selected from the group consisting of CdS, CdSe, ZnSe, InP, PbS, CsPbCl3, CsPbBr3, CsPhI3, CdS / ZnS, CdSe / ZnS, InP / ZnS, PbS / ZnS, CsPbCl3 / ZnS, CsPbBr3 / ZnS and CsPhI3 / ZnS.

[0090] Fig. 14B is a schematic diagram showing the structure of the second color conversion block according to some embodiments of the present disclosure. Fig. 14B, the second color conversion block CCB2 is a color conversion block configured to convert light of a third color (e.g., blue light) into light of a second color (e.g., green light). In some embodiments, the second color conversion block CCB2 includes a second matrix MS2, a plurality of second scattering particles SP2 dispersed in the second matrix MS2, and a plurality of second quantum dots QD2. The second matrix MS2 may include a polymer material, such as an organic polymer material. Examples of suitable polymer materials for preparing the second matrix MS2 include epoxy resins, acrylic resins, polyurethane resins, silicone resins, and silane resins. Examples of suitable materials for preparing the plurality of second scattering particles SP2 include TiO2, ZnO, ZrO2, Al2O3, SiO2. Examples of suitable quantum dot materials for manufacturing the plurality of second quantum dots QD2 include quantum dot materials of the second color (e.g., green). The quantum dot material may include a material selected from the group consisting of CdS, CdSe, ZnSe, InP, PbS, CsPbCl3, CsPbBr3, CsPhI3, CdS / ZnS, CdSe / ZnS, InP / ZnS, PbS / ZnS, CsPbCl3 / ZnS, CsPbBr3 / ZnS and CsPhI3 / ZnS.

[0091] Fig. 14C Schematic diagram showing the structure of a light-transmitting block in some embodiments of the present disclosure. Fig. 14C In some embodiments, the light-transmitting block LTB includes a third matrix MS3 and a plurality of third scattering particles SP3 dispersed in the third matrix MS3. The third matrix MS3 may include a polymer material, such as an organic polymer material. Examples of suitable polymer materials for preparing the third matrix MS3 include epoxy resins, acrylic resins, polyurethane resins, silicone resins, and silane resins. Examples of suitable materials for preparing the plurality of third scattering particles SP3 include TiO2, ZnO, ZrO2, Al2O3, and SiO2.

[0092] In one example, the first matrix MS1, the second matrix MS2, and the third matrix MS3 include the same polymer material. In another example, at least two of the first matrix MS1, the second matrix MS2, and the third matrix MS3 include different polymer materials.

[0093] In one example, the first scattering particles SP1, the second scattering particles SP2, and the third scattering particles SP3 include the same scattering material. In another example, at least two of the first scattering particles SP1, the second scattering particles SP2, and the third scattering particles SP3 include different scattering materials.

[0094] In some embodiments, reference Figure 8The display device further includes a light diffusion plate LD located on the light emitting substrate LES. In some embodiments, the display device further includes a light enhancement layer LEL located on a side of the color conversion layer CCL away from the light emitting substrate LES.

[0095] On the other hand, the present disclosure provides a spliced ​​screen display device. In some embodiments, the spliced ​​screen display device includes multiple display units. The multiple display units include multiple display panels and multiple light-emitting substrates configured to provide light to the multiple display panels. Each display unit in the multiple display units includes a corresponding display panel in the multiple display panels and a corresponding light-emitting substrate in the multiple light-emitting substrates. Optionally, the multiple display panels are spliced ​​together to display an image.

[0096] In some embodiments, the plurality of display units further include a plurality of color conversion layers, the plurality of color conversion layers being configured to convert light emitted from the plurality of light-emitting substrates. Each of the plurality of display units includes a corresponding color conversion layer of the plurality of color conversion layers. In some embodiments, each color conversion layer includes a plurality of color conversion blocks and a plurality of light-transmitting blocks, the plurality of color conversion blocks being configured to convert light emitted from the light-emitting substrates into light of different colors, and the plurality of light-transmitting blocks being configured to allow light emitted from the light-emitting substrates to pass through without color conversion.

[0097] In some embodiments, each display unit further comprises a light diffusion plate located on the corresponding light emitting substrate. In some embodiments, each display unit further comprises a light enhancement layer located on a side of the corresponding color conversion layer away from the light emitting substrate.

[0098] In some embodiments, each display unit includes a corresponding light-emitting substrate (e.g., a light-emitting substrate described herein) and a corresponding display panel configured to receive light emitted from the corresponding light-emitting substrate. In some embodiments, each display unit also includes one or more drive circuits. In some embodiments, one or more drive circuits are configured to adjust the drive currents provided to multiple types of light-emitting elements (e.g., drive currents provided to the first type of light-emitting element and the second type of light-emitting element, respectively). By adjusting the drive currents provided to the multiple types of light-emitting elements, the proportion of light in multiple wavelength ranges in the mixed light (e.g., the proportion of blue light with a relatively short wavelength and blue light with a relatively long wavelength in the mixed blue light) can be adjusted to produce a mixed light with a target color coordinate.

[0099] In some embodiments, one or more drive circuits are configured to independently adjust the drive current provided to multiple types of light-emitting elements for each of the multiple types. For example, a first drive current provided to a first type of light-emitting element and a second drive current provided to a second type of light-emitting element are independently adjusted by one or more drive circuits.

[0100] In some embodiments, the one or more driving circuits include multiple types of driving circuits, which are respectively connected to multiple types of light emitting elements. The corresponding driving circuits of each type are configured to adjust the driving current provided to the corresponding type of light emitting element. Fig.15 is a schematic diagram showing the structure of a corresponding display unit in some embodiments of the present disclosure. Fig.15 In some embodiments, the one or more driving circuits include a corresponding first driving circuit RDC1 and a corresponding second driving circuit RDC2. The corresponding first driving circuit RDC1 is connected to the first type of light emitting element le1 and is configured to adjust the driving current of the first type of light emitting element le1. The corresponding second driving circuit RDC2 is connected to the second type of light emitting element le2 and is configured to adjust the driving current of the second type of light emitting element le2.

[0101] Fig.16 Schematic diagram showing the structure of a spliced ​​screen display device according to some embodiments of the present disclosure. Fig.16 In some embodiments, the plurality of display units include a plurality of types of driving circuits. The respective display units RDU include a respective driving circuit of each type. Fig.16 As shown, in some embodiments, the corresponding display unit RDU includes a corresponding first drive circuit RDC1 and a corresponding second drive circuit RDC2. Optionally, the drive current in each of the multiple display units can be independently adjusted, and the color coordinates of the light emitted from each of the multiple display units can be independently adjusted. By independently adjusting the color coordinates of the light emitted from the multiple display units, substantially uniform color coordinates can be achieved throughout the multiple display units.

[0102] In the present light-emitting substrate and display device, various suitable light-emitting elements can be used. Examples of suitable light-emitting elements include mini light-emitting diodes, organic light-emitting diodes, quantum dot light-emitting diodes, and micro light-emitting diodes. Optionally, the light-emitting element is a mini light-emitting diode.

[0103] In the present light-emitting substrate and display device, various suitable pixel driving circuits can be used. Examples of suitable driving circuits include 3T1C, 2T1C, 4T1C, 4T2C, 5T2C, 6T1C, 7T1C, 7T2C, 8T1C and 8T2C. In some embodiments, each of the plurality of pixel driving circuits is a 3T1C driving circuit.

[0104] Fig.17 is a circuit diagram showing the structure of a corresponding pixel driving circuit in some embodiments of the present disclosure. Fig.17, the corresponding pixel driving circuit RPDC is connected to the corresponding light emitting element RLE. In some embodiments, the corresponding pixel driving circuit RPDC includes: a corresponding storage capacitor RCst having a first capacitor electrode coupled to the first node N1 and a second capacitor electrode coupled to the second node N2; a driving transistor T1 having a first electrode coupled to the corresponding voltage supply line RVdd, a second electrode coupled to the second node N2, and a gate coupled to the first node N1; a switching transistor T2 having a first electrode coupled to the corresponding data line RDL, a second electrode coupled to the first node N1, and a gate coupled to the corresponding first gate line RGL1; and a sensing transistor T3 having a first electrode coupled to the corresponding sensing line RSL, a second electrode coupled to the second node N2, and a gate coupled to the corresponding second gate line RGL2. The first node N1 is coupled to the gate of the driving transistor T1, the second electrode of the switching transistor T2, and the first capacitor electrode of the corresponding storage capacitor RCst. The second node N2 is coupled to the second electrode of the driving transistor T1 , the second electrode of the sensing transistor T3 , the second capacitor electrode of the corresponding storage capacitor RCst, and the anode of the corresponding light emitting element RLE.

[0105] On the other hand, the present disclosure provides a method for operating a display device, which includes a light-emitting substrate described herein and a display panel configured to receive light emitted from the light-emitting substrate. In some embodiments, the light-emitting substrate includes multiple types of light-emitting elements. Each type of light-emitting element in the multiple types of light-emitting elements is substantially uniformly distributed in the light-emitting substrate. In some embodiments, the method includes: adjusting the driving current provided to the multiple types of light-emitting elements respectively. Optionally, the method also includes driving different types of light-emitting elements to emit light of the same color but different wavelength ranges. Optionally, the method includes: driving different types of light-emitting elements to emit blue light but different wavelength ranges.

[0106] In some embodiments, the display device further comprises a color conversion layer. In some embodiments, the method further comprises: converting light emitted from the light-emitting substrate into light of different colors by a plurality of color conversion blocks of the color conversion layer; and allowing the light emitted from the light-emitting substrate to transmit through the plurality of light-transmitting blocks without color conversion.

[0107] On the other hand, the present disclosure provides a method for operating a spliced ​​screen display device, which includes multiple display units. In some embodiments, the multiple display units include multiple display panels and multiple light-emitting substrates. Optionally, each display unit in the multiple display units includes a corresponding display panel in the multiple display panels and a corresponding light-emitting substrate in the multiple light-emitting substrates. In some embodiments, the method includes: providing light to the multiple display panels through the multiple light-emitting substrates; and displaying an image in the multiple display panels spliced ​​together.

[0108] In some embodiments, the method further comprises: adjusting the driving currents respectively provided to the light emitting elements of the plurality of types. Optionally, the method comprises: independently adjusting the driving currents provided to the light emitting elements of the plurality of types for each of the plurality of types.

[0109] In some embodiments, the method further includes: independently adjusting a driving current in each of the plurality of display units by a plurality of types of driving circuits; and independently adjusting a color coordinate of light emitted from each of the plurality of display units by a plurality of types of driving circuits.

[0110] For the purpose of illustration and description, the above description of the embodiments of the present invention has been given. It is not exhaustive, nor is it intended to limit the present invention to the precise form or exemplary embodiments disclosed. Therefore, the foregoing description should be considered illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to explain the principles of the present invention and its best mode practical application, so that those skilled in the art can understand the various embodiments of the present invention and the various modifications suitable for the specific use or implementation under consideration. The scope of the present invention is intended to be defined by the appended claims and their equivalents, wherein all terms are meant to have the broadest reasonable meaning unless otherwise stated. Therefore, the term "the present invention" and the like do not necessarily limit the scope of the claims to a specific embodiment, and the reference to the exemplary embodiments of the present invention does not mean a limitation of the present invention, and such limitation should not be inferred. The present invention is limited only by the spirit and scope of the appended claims. In addition, these claims may involve the use of "first", "second", etc., followed by a noun or element. These terms should be understood as nomenclature, and should not be interpreted as limiting the number of elements modified by these nomenclatures, unless a specific number has been given. Any advantages and benefits described may not apply to all embodiments of the present invention. It should be understood that those skilled in the art may make changes to the described embodiments without departing from the scope of the present invention as defined by the appended claims. In addition, the elements and assemblies in this disclosure are not intended to be contributed to the public, regardless of whether the element or assembly is clearly described in the appended claims.

Claims

1. A light-emitting substrate comprising a plurality of types of light-emitting elements; in, Different types of light emitting elements are configured to emit light of the same color but in different wavelength ranges; and The light emitting elements of each type among the plurality of types of light emitting elements are substantially uniformly distributed in the light emitting substrate.

2. The light-emitting substrate according to claim 1, wherein: The different types of light emitting elements are configured to emit blue light but at different wavelength ranges.

3. The light-emitting substrate according to claim 1, wherein: The light emitting elements of the light emitting substrate are arranged in an array including a plurality of rows and a plurality of columns; and The plurality of types of light emitting elements are alternately arranged in at least one row of the array.

4. The light-emitting substrate according to any one of claims 1 to 3, wherein The respective percentages of each type of light emitting elements in each of the plurality of regions of the light emitting substrate are substantially the same; and Each of the plurality of regions of the light emitting substrate includes at least 10 light emitting elements.

5. The light emitting substrate according to claim 4, wherein: The plurality of types of light emitting elements are alternately arranged in each row of the array.

6. The light-emitting substrate according to any one of claims 1 to 3, wherein The light emitting elements of the light emitting substrate are arranged in an array including a plurality of rows and a plurality of columns; and The plurality of types of light emitting elements are arranged alternately in at least one column of the array.

7. The light-emitting substrate according to claim 6, wherein: The plurality of types of light emitting elements are alternately arranged in each column of the array.

8. The light-emitting substrate according to any one of claims 1 to 3, wherein The light emitting elements of the light emitting substrate are arranged in an array including a plurality of rows and a plurality of columns; and The plurality of types of light emitting elements are alternately arranged in at least one row of the array and in at least one column of the array.

9. The light emitting substrate according to claim 8, wherein: The plurality of types of light emitting elements are alternately arranged in each row of the array and in each column of the array.

10. The light-emitting substrate according to any one of claims 1 to 9, wherein The light-emitting substrate includes N types of light-emitting elements, where N is an integer greater than or equal to 2; as well as The percentage of the n-th type of light emitting elements in each of the plurality of regions of the light emitting substrate is substantially the same, 2≤n≤N.

11. The light-emitting substrate according to any one of claims 1 to 10, wherein: The light-emitting substrate includes a first type of light-emitting element and a second type of light-emitting element; Wherein, the first type of light emitting elements and the second type of light emitting elements are configured to emit blue light.

12. The light emitting substrate according to claim 11, wherein: The first type of light emitting element is configured to emit blue light having a wavelength in the range of 447 nm to 448 nm; and The second type of light emitting elements are configured to emit blue light having a wavelength in the range of 452 nm to 453 nm. 13 . A display device comprising the light emitting substrate according to claim 1 , and a display panel configured to receive light emitted from the light emitting substrate.

14. The display device according to claim 13, further comprising a color conversion layer; in, The color conversion layer comprises: a plurality of color conversion blocks configured to convert light emitted from the light emitting substrate into light of different colors; and A plurality of light-transmitting blocks are configured to allow light emitted from the light-emitting substrate to be transmitted therethrough without color conversion. 15 . The display device according to claim 13 , further comprising one or more driving circuits configured to adjust driving currents respectively provided to the plurality of types of light emitting elements.

16. A spliced ​​screen display device, comprising: multiple display units; Wherein, the plurality of display units include a plurality of display panels and a plurality of light emitting substrates configured to provide light to the plurality of display panels; Each of the plurality of display units includes a corresponding display panel of the plurality of display panels and a corresponding light emitting substrate of the plurality of light emitting substrates; and The plurality of display panels are spliced ​​together to display images; Wherein, the corresponding light-emitting substrate includes multiple types of light-emitting elements; wherein different types of light emitting elements are configured to emit light of the same color but in different wavelength ranges; and The light emitting elements of each type among the plurality of types of light emitting elements are substantially uniformly distributed in the light emitting substrate.

17. The spliced ​​screen display device according to claim 16, wherein: The plurality of display units further include a plurality of color conversion layers configured to convert light emitted from the plurality of light emitting substrates; Each display unit of the plurality of display units includes a corresponding color conversion layer of the plurality of color conversion layers; The corresponding color conversion layer comprises: a plurality of color conversion blocks configured to convert light emitted from the light emitting substrate into light of different colors; as well as A plurality of light-transmitting blocks are configured to allow the light emitted from the light-emitting substrate to be transmitted therethrough without color conversion.

18. The spliced ​​screen display device according to claim 16, wherein: Each display unit further includes one or more driving circuits, wherein the one or more driving circuits are configured to adjust driving currents respectively provided to the plurality of types of light emitting elements; as well as The one or more drive circuits are configured to independently adjust a drive current provided to the plurality of types of light emitting elements for each of the plurality of types.

19. The spliced ​​screen display device according to claim 16, wherein: The plurality of display units include a plurality of types of driving circuits; Each display unit includes a corresponding drive circuit of each type; The driving current in each of the plurality of display cells is independently regulated by the plurality of types of driving circuits; as well as The color coordinates of light emitted from each of the plurality of display units are independently adjusted by the plurality of types of driving circuits.

20. A method of operating a display device, the display device comprising a light emitting substrate and a display panel configured to receive light emitted from the light emitting substrate; in, The light-emitting substrate includes multiple types of light-emitting elements; as well as Each type of light emitting element of the plurality of types of light emitting elements is substantially uniformly distributed in the light emitting substrate; The method comprises: adjusting the driving currents respectively provided to the plurality of types of light emitting elements; and Different types of light emitting elements are driven to emit light of the same color but in different wavelength ranges.

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