Backlight module, display device and driving method of display device

Abstract

The embodiment of the invention provides a backlight module, a display device and a driving method of the display device. According to the backlight module, the light-emitting color of the second light-emitting chip is the same as that of the first light-emitting chip, and the wavelength of the light emitted by the second light-emitting chip is larger than that of the light emitted by the first light-emitting chip, so that the spectrum of the light emitted by the two light-emitting chips with different wavelengths is close to that of natural light; the eye protection effect is improved, the current output to the first light-emitting chip by the driving substrate is smaller than the current output to the second light-emitting chip by the driving substrate, the brightness uniformity of light emitted by the first light-emitting chip and the second light-emitting chip is good, and the display effect is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a backlight module, a display device and a driving method thereof. Background Technology

[0002] With the widespread use and increasing adoption of electronic products by younger users, displays are playing an increasingly important role in daily life. Eye health, superior image quality, and portability are becoming key considerations for consumers when purchasing electronic products. To improve eye protection, existing display devices adjust the spectrum of the emitted light to closely resemble or even match the spectrum of natural light. However, during the actual manufacturing process, uneven brightness on the light-incident side has been observed, resulting in the "firefly" phenomenon (where light emitted from multiple LEDs is projected at a certain angle, creating dark bands in areas not illuminated by the light, resulting in alternating bright and dark areas, hence the term "firefly"). This leads to poor display quality.

[0003] Therefore, existing display devices have a technical problem of uneven brightness on the light-incident side. Summary of the Invention

[0004] This application provides a backlight module, a display device, and a driving method thereof to alleviate the technical problem of uneven brightness on the light-incident side of existing display devices.

[0005] To achieve the above objectives, according to a first aspect of this application, a backlight module is provided, the backlight module including a light strip, the light strip comprising: Drive substrate; A first light-emitting chip is disposed on one side of the driving substrate, and the first light-emitting chip is electrically connected to the driving substrate; The second light-emitting chip is disposed on the same side of the driving substrate as the first light-emitting chip. The second light-emitting chip is electrically connected to the driving substrate. The second light-emitting chip and the first light-emitting chip are alternately disposed. The light emission color of the second light-emitting chip is the same as that of the first light-emitting chip. The wavelength of the light emitted by the second light-emitting chip is greater than that of the light emitted by the first light-emitting chip. The current output from the driving substrate to the first light-emitting chip is less than the current output from the driving substrate to the second light-emitting chip.

[0006] According to a second aspect of this application, a display device is provided, the display device comprising: The display panel and the backlight module as described in any of the above embodiments, wherein the backlight module is disposed on one side of the display panel.

[0007] According to a third aspect of this application, a driving method for a display device is also provided, which drives a display device as described in any of the above embodiments, the driving method comprising: When the display device is used in DC dimming mode, the brightness change data of the display device is acquired; Based on the brightness change data, the display control parameters of the display device are adjusted to adjust the chromaticity of the display device, and the display device is controlled to display according to the adjusted display control parameters and chromaticity.

[0008] This application provides a backlight module, a display device, and a driving method thereof. The backlight module makes the light emission color of the second light-emitting chip the same as that of the first light-emitting chip, and the wavelength of the light emitted by the second light-emitting chip is greater than that of the light emitted by the first light-emitting chip. This makes the spectrum of the light emitted by the two light-emitting chips with different wavelengths close to the spectrum of natural light, thereby improving the eye protection effect. In addition, the current output from the driving substrate to the first light-emitting chip is less than the current output from the driving substrate to the second light-emitting chip, thereby improving the brightness uniformity of the light emitted by the first and second light-emitting chips and improving the display effect.

[0009] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0011] Figure 1 The spectrum of natural light and the spectrum of each contrast display device provided for embodiments of this application.

[0012] Figure 2 This is a schematic diagram of a backlight module provided in an embodiment of this application.

[0013] Figure 3 This is a first schematic diagram of a light strip provided in an embodiment of this application.

[0014] Figure 4 This is a planar schematic diagram of the light strip and light guide plate in the backlight module provided in the embodiments of this application.

[0015] Figure 5 This is a second schematic diagram of a light strip provided in an embodiment of this application.

[0016] Figure 6 This is a schematic diagram of a display device provided in an embodiment of this application.

[0017] Figure 7 This is a plan view of the display panel and light strip in the display device provided in the embodiments of this application.

[0018] Figure 8 This is a flowchart of a driving method for a display device provided in an embodiment of this application.

[0019] Figure 9 Another flowchart of a driving method for a display device provided in an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 1. Backlight module; 201. Display area; 201a. First display sub-area; 201b. Second display sub-area; 21. Display panel; 211. First substrate; 212. Second substrate; 221. Back plate; 221a. Bottom plate; 221b. Side plate; 221c. Top plate; 222. First reflective sheet; 223. Light guide plate; 223a. Dot pattern; 224. Optical film; 224a. Light-diffusing film; 224b. Prism sheet; 224c. 225. Diffuser sheet; 226. Lamp strip; 227. Second reflector sheet; 23. First tape; 24. Second tape; 251. First polarizer; 252. Second polarizer; 31. Driver substrate; 32. First type of light-emitting diode; 321. First light-emitting chip; 322. Third light-emitting chip; 33. Second type of light-emitting diode; 331. Second light-emitting chip; 34. Third type of light-emitting diode; 341. First region; 342. Second region. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0022] To illustrate the principle behind the technical problems in the embodiments of this application, some comparative display devices are provided. It should be understood that these comparative display devices are not considered prior art in the embodiments of this application. Figure 1 As shown, Figure 1 (a) in the image represents the spectrum of natural light (sunlight). Figure 1(b) shows the spectrum of a typical light-emitting diode (LED). To achieve a natural light-like effect, several contrast display devices have been proposed. The first type of contrast display device uses a blue light chip with a wavelength of 460 nanometers, combined with green, yellow, and red phosphors to emit light. The spectrum of the emitted light is as follows: Figure 1 As shown in (c), it can be seen that it uses a single-crystal light-emitting diode, which has a small package and is suitable for small and medium-sized display devices. However, its blue light intensity is high and the maximum concentration of phosphor cannot achieve a full spectrum similar to natural light.

[0023] The second type of contrast display device uses a blue light chip with a wavelength of 440 nanometers and a blue light chip with a wavelength of 460 nanometers, combined with green, yellow, and red phosphors to emit light, resulting in a light spectrum of [missing information]. Figure 1 As shown in (d), its excitation efficiency is relatively high, but the blue light spectrum has poor continuity and the phosphor concentration is high, making it impossible to manufacture small-sized packages. There are two ways to achieve this: one is to use dual-crystal packaging, but the package is too large and not suitable for making narrow-bezel thin and light products; the other is to use single-crystal light-emitting chip packaging and hybrid assembly, but there will be brightness blockage and metamerism issues, resulting in color difference and firefly problems on the light-incident side.

[0024] The third type of contrast display device uses blue light chips with a wavelength of 440 nm, 450 nm, and 465 nm, combined with green, yellow, and red phosphors to emit light, resulting in a light spectrum of [missing information]. Figure 1 As shown in (e), its blue light spectrum has high continuity, but it has many chips and high phosphor concentration, making it impossible to manufacture small-size packages.

[0025] The fourth type of contrast display device uses a chip that emits ultraviolet light, combined with blue, green, yellow, and red phosphors to emit light, resulting in a light spectrum of [missing information]. Figure 1 As shown in (f), its blue light spectrum has high continuity, but its ultraviolet light excitation efficiency is low, the phosphor concentration is high, the brightness is low, and the existing PPA (Polyphthalamide) cannot withstand long-term ultraviolet light irradiation.

[0026] The above analysis shows that in terms of natural light-like effects: the fourth type of contrast display device is superior to the third type, the third type is superior to the second type, and the second type is superior to the first type. However, the third and fourth types require larger LED packages, making them unsuitable for small to medium-sized displays. The first type has a severe yellow tint. Therefore, the second type is more suitable for small to medium-sized displays, but using dual-crystal packaging results in a larger package size, making it unsuitable for narrow-bezel, thin products. In the design of mixed single-crystal packaging, the different efficiencies of the chips in different wavelengths excitation phosphors lead to different brightness levels and spectra of the LEDs. This results in color difference and the "firefly effect" (where light from multiple LEDs is emitted at a certain angle, creating dark bands in areas not illuminated by the light, creating an alternating bright and dark pattern) on the light-incident side, leading to poor display quality. Therefore, existing display devices suffer from uneven brightness on the light-incident side.

[0027] This application provides a backlight module, a display device, and a driving method thereof to address the aforementioned technical problems.

[0028] Figure 2 This is a schematic diagram of a backlight module provided in an embodiment of this application. Figure 3 This is a first schematic diagram of a light strip provided in an embodiment of this application. Figure 4 This is a planar schematic diagram of the light strip and light guide plate in the backlight module provided in the embodiments of this application. Figure 5 This is a second schematic diagram of a light strip provided in an embodiment of this application. Figure 6 This is a schematic diagram of a display device provided in an embodiment of this application. Figure 7 This is a plan view of the display panel and light strip in the display device provided in the embodiments of this application. Figure 8 This is a flowchart of a driving method for a display device provided in an embodiment of this application. Figure 9 Another flowchart of a driving method for a display device provided in an embodiment of this application.

[0029] like Figure 2As shown, this application embodiment provides a backlight module 1, which includes a backplate 221, a first reflective sheet 222, a light guide plate 223, a second reflective sheet 226, an optical film 224, and a light strip 225. The backplate 221 includes a bottom plate 221a, a side plate 221b, and a top plate 221c. The bottom plate 221a, side plate 221b, and top plate 221c of the backplate 221 are connected to form an accommodating space. The light strip 225 is disposed between the side plate and the light guide plate 223 on one side of the backplate 221. The first reflective sheet 222, the light guide plate 223, the second reflective sheet 226, and the optical film 224 are disposed within the accommodating space, and the first reflective sheet 222, the light guide plate 223, and the optical film 224 are arranged sequentially along the direction away from the bottom plate 221a of the backplate 221.

[0030] Specifically, such as Figure 2 As shown, the optical film 224 includes a light-diffusing film 224a, a prism sheet 224b, and a diffuser 224c. However, the embodiments of this application are not limited to this. For example, the optical film 224 may also include a color conversion film, or the optical film 224 may include a lower diffuser, a lower prism sheet, an upper prism sheet, and an upper diffuser.

[0031] Specifically, such as Figure 3 As shown, the light strip 225 includes a driving substrate 31 and light-emitting diodes disposed on the driving substrate 31. The light-emitting diodes include a first type of light-emitting diode 32 and a second type of light-emitting diode 33. The first type of light-emitting diode 32 includes a first light-emitting chip 321 and phosphor, and the second type of light-emitting diode 33 includes a second light-emitting chip 331 and phosphor, so that both the first type of light-emitting diode 32 and the second type of light-emitting diode 33 can emit white light.

[0032] Specifically, the first light-emitting chip 321 and the second light-emitting chip 331 can emit blue light. The phosphor can be a mixture of green phosphor, yellow phosphor and red phosphor. The green phosphor can be a nitride-based green phosphor, the yellow phosphor can be a silicate-based yellow phosphor, and the red phosphor can be a nitride-based red phosphor.

[0033] Specifically, the light strip in this embodiment can be set on the side near the side panel or on the bottom plate. That is, the backlight module in this embodiment can be a side-lit design or a direct-lit design. The following embodiments use the side-lit design as an example for explanation. When the backlight module is a direct-lit design, please refer to the following description.

[0034] Specifically, the backlight module may include only one LED strip or two LED strips.

[0035] like Figure 2 , Figure 3As shown in the figure, this application embodiment provides a backlight module 1, which includes a light strip 225. The light strip 225 includes a driving substrate 31, a first light-emitting chip 321, and a second light-emitting chip 331. The first light-emitting chip 321 is disposed on one side of the driving substrate 31 and is electrically connected to the driving substrate 31. The second light-emitting chip 331 is disposed on the same side of the driving substrate 31 as the first light-emitting chip 321 and is electrically connected to the driving substrate 31. The second light-emitting chip 331 and the first light-emitting chip 321 are alternately arranged. The light emission color of the second light-emitting chip 331 is the same as that of the first light-emitting chip 321. The wavelength of the light emitted by the second light-emitting chip 331 is greater than the wavelength of the light emitted by the first light-emitting chip 321. The current output from the driving substrate 31 to the first light-emitting chip 321 is less than the current output from the driving substrate 31 to the second light-emitting chip 331.

[0036] This application provides a backlight module 1. The backlight module 1 makes the light emission color of the second light-emitting chip 331 the same as that of the first light-emitting chip 321. The wavelength of the light emitted by the second light-emitting chip 331 is greater than that of the light emitted by the first light-emitting chip 321. This makes the spectrum of the light emitted by the two light-emitting chips with different wavelengths close to the spectrum of natural light, thus improving the eye protection effect. In addition, the current output from the driving substrate 31 to the first light-emitting chip 321 is less than the current output from the driving substrate 31 to the second light-emitting chip 331, so that the brightness uniformity of the light emitted by the first light-emitting chip 321 and the second light-emitting chip 331 is better, thus improving the display effect.

[0037] Specifically, under the same current, the light-emitting chip with a shorter wavelength has higher brightness, while the light-emitting chip with a longer wavelength has lower brightness. This results in different brightness levels between the first and second light-emitting chips, leading to uneven display. In this embodiment, the current output from the driving substrate 31 to the first light-emitting chip 321 is less than the current output from the driving substrate 31 to the second light-emitting chip 331, so that the brightness of the light emitted by the first light-emitting chip 321 is equal to the brightness of the light emitted by the second light-emitting chip 331. This improves the uniformity of brightness of the light emitted by the backlight module and enhances the display effect.

[0038] Specifically, the first and second light-emitting chips can be driven separately, allowing them to receive different currents.

[0039] In some embodiments, such as Figure 2 , Figure 4As shown, the backlight module 1 further includes a back plate 221 and a light guide plate 223. The back plate 221 includes a bottom plate 221a, a side plate 221b, and a top plate 221c. The bottom plate 221a, the side plate 221b, and the top plate 221c are connected to form an accommodating space. The light guide plate 223 is disposed within the accommodating space, and the lamp strip 225 is disposed between the side plate 221b and the light guide plate 223. The density of the dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331 is greater than the density of the dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321. By making the density of the dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331 greater than the density of the dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321, the light emitted by the first light-emitting chip 321 and the second light-emitting chip 331 will have similar or even the same brightness after being guided out by the light guide plate 223, thereby improving the brightness uniformity.

[0040] In some embodiments, such as Figure 4 As shown, the light guide plate 223 includes a first region 341 near the light strip and a second region 342 away from the light strip. In the first region 341, the density of dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331 is greater than the density of dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321. In the second region 342, the density of dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331 is equal to the density of dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321. By making the density of dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331 greater than the density of dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321 in the same region as the light strip 225, the brightness of the light emitted by the first light-emitting chip 321 after passing through the light guide plate 223 is similar to or even the same as the brightness of the light emitted by the second light-emitting chip 331 after passing through the light guide plate 223, thus improving brightness uniformity. Furthermore, in the second region 342 of the light guide plate 223 away from the light strip 225, the density of dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331 is equal to the density of dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321, reducing manufacturing difficulty.

[0041] Specifically, it can be understood that in a side-lit backlight module, the LED strip 225 is set on one side of one side panel of the back panel, and the LED strip 225 is not set on the other three side panels. As a result, on the side where the LED strip 225 is set, the light emitted by the first light-emitting chip 321 and the second light-emitting chip 331 cannot be fully mixed, causing the light emitted by the first light-emitting chip 321 and the light emitted by the second light-emitting chip 331 to be in different areas. Since the brightness of the light emitted by the first light-emitting chip 321 is different from that of the light emitted by the second light-emitting chip 331, the brightness is uneven. In this embodiment, the density of dots 223a in the first region 341 of the light guide plate 223 near the lamp strip 225 is made greater than the density of dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331. This ensures that the brightness of the light emitted by the second light-emitting chip 331 after passing through the light guide plate is similar to or even the same as the brightness of the light emitted by the first light-emitting chip 321 after passing through the light guide plate, thus improving brightness uniformity. In the second region of the light guide plate 223 far from the lamp strip 225, due to the greater distance, the light emitted by the first and second light-emitting chips 321 may mix more thoroughly, preventing brightness unevenness. Therefore, the density of dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331 can be made equal to the density of dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321.

[0042] In some embodiments, in the first region 341, the density of dots 223a in the portion of the light guide plate 223 corresponding to the region between the first light-emitting chip 321 and the second light-emitting chip 331 is greater than the density of dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321, and the density of dots 223a in the portion of the light guide plate 223 corresponding to the region between the first light-emitting chip 321 and the second light-emitting chip 331 is less than the density of dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331; this makes the brightness of the light passing through the light guide plate 223 and the portion corresponding to the region between the first light-emitting chip 321 and the second light-emitting chip 331 similar to or even the same as the brightness of other regions, thereby improving brightness uniformity.

[0043] Specifically, it can be understood that in the first region 341 of the light guide plate 223 near the lamp strip 225, the brightness of the region corresponding to the region between the first light-emitting chip 321 and the second light-emitting chip 331 may be between the brightness of the region corresponding to the first light-emitting chip 321 and the brightness of the region corresponding to the second light-emitting chip 331. Therefore, the density of dots in the light guide plate 223 corresponding to the first light-emitting chip 321, the region between the first light-emitting chip 321 and the second light-emitting chip 331, and the portion corresponding to the second light-emitting chip 331 can be increased, thereby improving the brightness uniformity.

[0044] In some embodiments, in any region of the light guide plate 223, the density of the dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331 is greater than the density of the dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321; this allows the brightness of any region to be adjusted by the density of the dots 223a in the light guide plate 223, so that the brightness of the light emitted from the portion of the light guide plate 223 corresponding to the first light-emitting chip 321 is close to or even the same as the brightness of the light emitted from the portion of the light guide plate 223 corresponding to the second light-emitting chip 331, thereby improving brightness uniformity.

[0045] Specifically, in any region of the light guide plate 223, the density of dots 223a in the portion of the light guide plate 223 corresponding to the region between the first light-emitting chip 321 and the second light-emitting chip 331 is greater than the density of dots 223a in the portion of the light guide plate 223 corresponding to the first light-emitting chip 321, and the density of dots 223a in the portion of the light guide plate 223 corresponding to the region between the first light-emitting chip 321 and the second light-emitting chip 331 is less than the density of dots 223a in the portion of the light guide plate 223 corresponding to the second light-emitting chip 331.

[0046] In some embodiments, such as Figure 5As shown, the light strip 225 also includes a third light-emitting chip 322, which is disposed between the first light-emitting chip 321 and the second light-emitting chip 331. The light emitted by the third light-emitting chip 322 is the same as that emitted by the first light-emitting chip 321. The wavelength of the light emitted by the third light-emitting chip 322 is greater than that emitted by the first light-emitting chip 321, and less than that emitted by the second light-emitting chip 331. By distributing the third light-emitting chip 322 between the first and second light-emitting chips 321, the wavelength of the light emitted by the third light-emitting chip 322 is greater than that emitted by the first light-emitting chip 321, and less than that emitted by the second light-emitting chip 331. This results in the brightness of the light emitted by the third light-emitting chip 322 being between the brightness of the light emitted by the first and second light-emitting chips 321, thus optimizing the display effect through a gradual brightness gradient.

[0047] Specifically, for example, the wavelength of light emitted by the first light-emitting chip 321 can be 440 nanometers, the wavelength of light emitted by the second light-emitting chip 331 can be 460 nanometers, and the wavelength of light emitted by the third light-emitting chip 322 can be 450 nanometers.

[0048] Specifically, such as Figure 5 As shown, the light strip 225 includes a third type of light-emitting diode 34, which includes a third light-emitting chip 322 and phosphor.

[0049] Specifically, the third light-emitting chip 322 can emit blue light, and the phosphor can be a mixture of green phosphor, yellow phosphor and red phosphor. The green phosphor can be a nitride-based green phosphor, the yellow phosphor can be a silicate-based yellow phosphor, and the red phosphor can be a nitride-based red phosphor.

[0050] Meanwhile, this application provides a display device, which includes a backlight module as described in any of the above embodiments.

[0051] like Figure 6As shown in the figure, this application provides a display device, which includes a display panel 21 and a backlight module 1. The backlight module 1 is disposed on one side of the display panel 21 and includes a lamp strip 225. The lamp strip 225 includes a driving substrate 31, a first light-emitting chip 321 and a second light-emitting chip 331. The first light-emitting chip 321 is disposed on one side of the driving substrate 31 and is electrically connected to the driving substrate 31. The second light-emitting chip 331 is disposed on the same side of the driving substrate 31 as the first light-emitting chip 321 and is electrically connected to the driving substrate 31. The second light-emitting chip 331 and the first light-emitting chip 321 are alternately arranged. The light emission color of the second light-emitting chip 331 is the same as that of the first light-emitting chip 321. The wavelength of the light emitted by the second light-emitting chip 331 is greater than the wavelength of the light emitted by the first light-emitting chip 321. The current output from the driving substrate 31 to the first light-emitting chip 321 is less than the current output from the driving substrate 31 to the second light-emitting chip 331.

[0052] This application provides a display device that improves eye protection by making the light emitted by the second light-emitting chip 331 the same as that of the first light-emitting chip 321, and by making the wavelength of the light emitted by the second light-emitting chip 331 greater than that of the first light-emitting chip 321. Furthermore, the device ensures that the current output from the driving substrate 31 to the first light-emitting chip 321 is less than the current output from the driving substrate 31 to the second light-emitting chip 331, resulting in better brightness uniformity of the light emitted by the first and second light-emitting chips 321.

[0053] In some embodiments, such as Figure 6 , Figure 7 As shown, the display panel 21 includes a display area 201. Within the display area 201, the transmittance of the portion of the display panel 21 corresponding to the second light-emitting chip 331 is greater than the transmittance of the portion of the display panel 21 corresponding to the first light-emitting chip 321. By making the transmittance of the portion of the display panel 21 corresponding to the second light-emitting chip 331 greater than the transmittance of the portion of the display panel 21 corresponding to the first light-emitting chip 321, the brightness of the light emitted through the display panel 21 is similar or even the same, thereby improving brightness uniformity and display uniformity.

[0054] Specifically, transmittance can be measured under CIE standard light source D65 and perpendicular incidence conditions.

[0055] Specifically, it can be understood that the display panel 21 includes a display area 201 and a non-display area. The non-display area can be disposed on the four sides of the display area 201, and the non-display area can be disposed around the display area 201. Specifically, the non-display area may include a lower border area corresponding to the binding area, an upper border area disposed opposite to the binding area, and a left border area and a right border area. When the backlight module's light strip is disposed on the side plate of the back panel, in order to avoid increasing the size of other borders, the light strip can be disposed on one side of the lower border.

[0056] In some embodiments, within the display area 201, the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331 is greater than the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321. By making the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331 greater than the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321, the brightness of the light emitted through the display panel 21 is similar or even the same, thereby improving brightness uniformity and display uniformity.

[0057] Specifically, the aperture ratio can be defined as the percentage of the effective light-transmitting area of ​​a subpixel to its total area.

[0058] Specifically, the display panel includes sub-pixels. By adjusting the aperture ratio of the sub-pixels, the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331 is made greater than the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321. This results in the transmittance of the portion of the display panel 21 corresponding to the second light-emitting chip 331 being greater than the transmittance of the portion of the display panel 21 corresponding to the first light-emitting chip 321, thereby improving brightness uniformity and display uniformity.

[0059] In some embodiments, such as Figure 7As shown, the display area 201 includes a first display sub-area 201a on the side closer to the light strip 225 and a second display sub-area 201b on the side farther from the light strip 225. In the first display sub-area 201a, the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331 is greater than the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321. In the second display sub-area 201b, the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331 is equal to the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321. By making the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331 greater than the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321 within the first display sub-region 201a, the brightness of the light emitted by the first light-emitting chip 321 after passing through the display panel 21 is similar to or even the same as the brightness of the light emitted by the second light-emitting chip 331 after passing through the display panel 21 in the region near the lamp strip 225, thus improving brightness uniformity. Furthermore, by making the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331 equal to the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321 within the second display sub-region 201b, the manufacturing difficulty is reduced.

[0060] Specifically, it can be understood that in a side-lit backlight module, the LED strip 225 is disposed on one side panel of the back panel, while the other three side panels do not have LED strips 225. This results in insufficient light mixing between the first LED chip 321 and the second LED chip 331 on the side near where the LED strip 225 is disposed. Consequently, the light emitted by the first LED chip 321 and the second LED chip 331 will be in different areas, and the brightness of the light emitted by the first LED chip 321 will differ from that of the second LED chip 331, leading to uneven brightness. This embodiment improves brightness uniformity by making the aperture ratio of the portion of the display panel 21 corresponding to the second LED chip 331 greater than the aperture ratio of the portion of the display panel 21 corresponding to the first LED chip 321 within the first display sub-area 201a. This ensures that the brightness of the light emitted by the second LED chip 331 after passing through the display panel is similar to or even the same as the brightness of the light emitted by the first LED chip 321 after passing through the display panel. As for the second display sub-area 201b, since it is far from the light strip 225, the light emitted by the first light-emitting chip 321 and the second light-emitting chip 331 may be mixed more fully, and there will be no problem of uneven brightness. Therefore, the aperture ratio of the part of the display panel 21 corresponding to the second light-emitting chip 331 can be equal to the aperture ratio of the part of the display panel 21 corresponding to the first light-emitting chip 321.

[0061] In some embodiments, within the first display sub-region 201a, the aperture ratio of the portion of the display panel 21 corresponding to the area between the first light-emitting chip 321 and the second light-emitting chip 331 is less than the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331, and the aperture ratio of the portion of the display panel 21 corresponding to the area between the first light-emitting chip 321 and the second light-emitting chip 331 is greater than the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321. This ensures that the brightness of the light passing through the portion of the display panel corresponding to the area between the first light-emitting chip 321 and the second light-emitting chip 331 is similar to or even the same as the brightness of other areas, improving brightness uniformity.

[0062] Specifically, it can be understood that in the first display sub-region 201a, the brightness of the area corresponding to the region between the first light-emitting chip 321 and the second light-emitting chip 331 may be between the brightness of the area corresponding to the first light-emitting chip 321 and the brightness of the area corresponding to the second light-emitting chip 331. Therefore, the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321, the region between the first light-emitting chip 321 and the second light-emitting chip 331, and the portion corresponding to the second light-emitting chip 331 can be increased, thereby improving the brightness uniformity.

[0063] In some embodiments, in any region of the display area 201, the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331 is greater than the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321. This allows the brightness of any region to be adjusted by the aperture ratio of the display panel, making the brightness of light passing through the portion of the display panel 21 corresponding to the first light-emitting chip 321 close to or even the same as the brightness of light passing through the portion of the display panel 21 corresponding to the second light-emitting chip 331, thereby improving brightness uniformity.

[0064] Specifically, in any area of ​​the display area 201, the aperture ratio of the portion of the display panel 21 corresponding to the area between the first light-emitting chip 321 and the second light-emitting chip 331 can be greater than the aperture ratio of the portion of the display panel 21 corresponding to the first light-emitting chip 321, and the aperture ratio of the portion of the display panel 21 corresponding to the area between the first light-emitting chip 321 and the second light-emitting chip 331 can be less than the aperture ratio of the portion of the display panel 21 corresponding to the second light-emitting chip 331.

[0065] In some embodiments, the width of the first display sub-region 201a ranges from 2 mm to 3 mm, thereby improving brightness uniformity by changing the transmittance and / or aperture ratio of each region to make the brightness of each region similar or even the same.

[0066] Specifically, the display panel 21 includes a first substrate 211, a second substrate 212 and a liquid crystal layer (not shown). The first substrate 211 and the second substrate 212 are disposed opposite to each other, and the bonding portion of the first substrate 211 may extend beyond the second substrate 212.

[0067] Specifically, the first substrate 211 can be an array substrate, and the second substrate 212 can be a color filter substrate. That is, the first substrate 211 can include various film layers for forming thin-film transistors and pixel electrode layers, such as a gate layer, active layer, source / drain layer, pixel electrode layer, insulating layer, and planarization layer. The second substrate 212 can include a common electrode layer, a color filter layer, and a black matrix, etc. Alternatively, the first substrate 211 can be a COA (Color On Array) substrate, and the second substrate 212 is a substrate opposite to the COA substrate. The second substrate 212 can have a common electrode layer and a black matrix, but no color filter layer, or it can have a common electrode layer but no black matrix or color filter layer. Alternatively, the first substrate 211 can have both a pixel electrode layer and a common electrode layer.

[0068] Specifically, the display device also includes a first tape 23, a second tape 24, a first polarizer 251 and a second polarizer 252. The first polarizer 251 and the second polarizer 252 are attached to both sides of the display panel 21, and the second tape 24 is attached to the back plate and the display panel 21.

[0069] Specifically, the first polarizer 251 is disposed on the side of the first substrate 211 away from the second substrate 212 and is attached to the first substrate 211, and the second polarizer 252 is disposed on the side of the second substrate 212 away from the first substrate 211 and is attached to the second substrate 212.

[0070] Meanwhile, this application provides a driving method for a display device, which is used to drive any of the display devices described in the above embodiments.

[0071] In some embodiments, such as Figure 8 As shown, the driving method of the display device includes: When the display device uses DC dimming mode for display, acquire the brightness change data of the display device; Based on the brightness change data, the display control parameters of the display device are adjusted to adjust the chromaticity of the display device, and the display device is controlled to display according to the adjusted display control parameters and chromaticity.

[0072] When the display device is set to DC dimming mode, the color compensation function is activated to improve the problem that the color point of the light-emitting device changes significantly with brightness in DC dimming mode, thereby improving color difference.

[0073] Specifically, in addition to the problem of uneven brightness, the first and second light-emitting chips also have the problem of metamerism. When the color filter layer cannot take into account the spectrum of the first and second light-emitting chips, the display device can be lit up and a surface scan can be performed to generate chromaticity data of the entire surface. Then, the gamma voltage of each area can be adjusted according to the chromaticity data to improve the color difference.

[0074] When correcting color points by setting different brightness levels, the step of adjusting the display control parameters of the display device based on the brightness change data includes: Determine whether the brightness change data equals the preset brightness value; When the brightness change data equals the preset brightness value, the data voltage received by multiple sub-pixels in the display device is adjusted according to the relationship between the preset brightness value and the data voltage.

[0075] Optionally, a device such as a timing controller can be used to determine whether the brightness change data is equal to a preset brightness value. The data voltage can be adjusted using a timing controller, source driver, or other devices.

[0076] After the step of determining whether the brightness change data is equal to the preset brightness value, the method further includes: when the brightness change data is not equal to the preset brightness value, performing the determination again whether the brightness change data is equal to the preset brightness value.

[0077] When the brightness change data equals the preset brightness value, the data voltage received by multiple sub-pixels in the display device can be adjusted according to the relationship between the preset brightness value and the data voltage to correct the color point. The adjustment can be performed in advance to obtain and store the relationship between the preset brightness value and the data voltage.

[0078] Accordingly, before the step of adjusting the data voltage received by multiple sub-pixels in the display device according to the relationship between the preset brightness value and the data voltage, the method includes: When the display device is in DC dimming mode and displays the test screen, acquire the brightness change data of the display device; When the brightness change data equals the preset brightness value, determine whether the chromaticity data corresponding to the preset brightness value equals the target chromaticity data; When the chromaticity data corresponding to the preset brightness value is not equal to the target chromaticity data, the data voltage received by multiple sub-pixels is adjusted so that the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data. The preset brightness value and the data voltage received by the sub-pixel when the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data are associated and stored to obtain the relationship between the preset brightness value and the data voltage.

[0079] The test screen can include pure red, pure green, pure blue, etc. When the display device is in DC dimming mode, the brightness change data corresponds to changing from 100% brightness to 1%. The target chromaticity data can be the specification center value. The specification center value can be the chromaticity data corresponding to the central display area of ​​the display panel in the display device. The central display area includes at least one pixel, each pixel includes multiple sub-pixels, and the emission colors of multiple sub-pixels located in the same pixel can be different.

[0080] It should be noted that multiple sub-pixels can correspond to sub-pixels with different emission colors. For example, multiple sub-pixels may include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the first, second, and third sub-pixels emit different emission colors. Understandably, the data voltage received by the first, second, and third sub-pixels can be set differently depending on the actual display requirements.

[0081] Optionally, the first sub-pixel emits light in red, the second sub-pixel emits light in green, and the third sub-pixel emits light in blue.

[0082] Optical equipment such as a colorimeter can be used to help determine whether the chromaticity data corresponding to the preset brightness value is equal to the target chromaticity data. The relationship between the preset brightness value and the data voltage can be stored using devices such as memory.

[0083] For ease of use, the compensation processes for different color point correction levels can be integrated into the same control logic. This allows the relationship between the preset brightness value and the data voltage for different color point correction levels to be invoked based on the changes in brightness data as the brightness data gradually changes from 100% to 1%.

[0084] Optionally, the color point correction level can be set to two or more levels. To make the above driving method applicable to multiple display devices, the relationship between preset brightness values ​​and data voltages can be obtained for multiple display devices, and then the average of the preset brightness values ​​and data voltages for multiple display devices can be obtained to obtain a driving method applicable to multiple display devices. Accordingly, in scenarios where color point fluctuations in the film layer materials, light guide plates, or light-emitting devices used in the display device result in a large range of color point specifications for the display device, the above driving method can also be used to correct the color points.

[0085] In addition, multiple display devices can each have a corresponding preset brightness value and data voltage relationship. The preset brightness value and data voltage relationship of each of the multiple display devices can be centrally stored and individually called when needed, so that the above driving method can be applied to scenarios with strict color point specifications, thereby realizing individual adjustment of each display device.

[0086] Please continue reading. Figure 9 In practical applications, the process involves several steps: illuminating the display panel, controlling the color temperature to meet design requirements, and ensuring DC dimming is not activated. By collecting tristimulus values ​​at different grayscale levels corresponding to different display images, and analyzing this data, the process determines whether to enable adjustments to the display control parameters by calling the algorithm interface (i.e., corresponding...). Figure 9 (The part in auto_gamma_Library.dll). Afterwards, the adjusted display control parameters are stored in a storage device, and the color point and brightness detection processes (i.e., ΔE control process and optical detection process) are activated to verify whether the adjusted display control parameters can make the color point meet the requirements. The storage device can be integrated into the timing controller. Optionally, the storage device is volatile memory or non-volatile memory. After storing the adjusted display control parameters in the storage device, it can be determined whether the data has been successfully stored. If it is determined that the data has not been successfully stored, the timing controller is reset, and the steps of controlling the display color to meet the design requirements and ensuring that the DC dimming mode is not activated are re-executed. If it is determined that the data has been successfully stored, the color point and brightness detection processes can proceed.

[0087] Specifically, it is understood that the embodiments of this application provide multiple solutions to improve the image quality and / or metamerism problem of the brightness difference between the first light-emitting chip and the second light-emitting chip. When there is no conflict between the embodiments, the embodiments can be combined. For example, the backlight module further includes a back plate and a light guide plate. The back plate includes a bottom plate, a side plate, and a top plate. The bottom plate, the side plate, and the top plate are connected to form an accommodating space. The light guide plate is disposed in the accommodating space, and the light strip is disposed between the side plate and the light guide plate. The dot density of the portion of the light guide plate corresponding to the second light-emitting chip is greater than the dot density of the portion of the light guide plate corresponding to the first light-emitting chip. The light strip also includes a third light-emitting chip, which is disposed between the first light-emitting chip and the second light-emitting chip. The emission color of the third light-emitting chip is the same as the emission color of the first light-emitting chip. The wavelength of the light emitted by the third light-emitting chip is greater than the wavelength of the light emitted by the first light-emitting chip, and the wavelength of the light emitted by the third light-emitting chip is less than the wavelength of the light emitted by the second light-emitting chip.

[0088] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A backlight module, characterized in that, Includes a light strip, the light strip comprising: Drive substrate; A first light-emitting chip is disposed on one side of the driving substrate, and the first light-emitting chip is electrically connected to the driving substrate; The second light-emitting chip is disposed on the same side of the driving substrate as the first light-emitting chip. The second light-emitting chip is electrically connected to the driving substrate. The second light-emitting chip and the first light-emitting chip are alternately disposed. The light emission color of the second light-emitting chip is the same as that of the first light-emitting chip. The wavelength of the light emitted by the second light-emitting chip is greater than that of the light emitted by the first light-emitting chip. The current output from the driving substrate to the first light-emitting chip is less than the current output from the driving substrate to the second light-emitting chip.

2. The backlight module according to claim 1, characterized in that, The backlight module further includes a back plate and a light guide plate. The back plate includes a bottom plate, a side plate, and a top plate. The bottom plate, the side plate, and the top plate are connected to form an accommodating space. The light guide plate is disposed within the accommodating space, and the light strip is disposed between the side plate and the light guide plate. The dot density of the portion of the light guide plate corresponding to the second light-emitting chip is greater than the dot density of the portion of the light guide plate corresponding to the first light-emitting chip.

3. The backlight module according to claim 2, characterized in that, The light guide plate includes a first region close to the light strip and a second region away from the light strip; In the first region, the dot density of the portion of the light guide plate corresponding to the second light-emitting chip is greater than the dot density of the portion of the light guide plate corresponding to the first light-emitting chip. In the second region, the dot density of the portion of the light guide plate corresponding to the second light-emitting chip is equal to the dot density of the portion of the light guide plate corresponding to the first light-emitting chip.

4. The backlight module according to claim 3, characterized in that, In the first region, the dot density of the portion of the light guide plate corresponding to the region between the first light-emitting chip and the second light-emitting chip is greater than the dot density of the portion of the light guide plate corresponding to the first light-emitting chip, and the dot density of the portion of the light guide plate corresponding to the region between the first light-emitting chip and the second light-emitting chip is less than the dot density of the portion of the light guide plate corresponding to the second light-emitting chip.

5. The backlight module according to claim 2, characterized in that, In any region of the light guide plate, the dot density of the portion of the light guide plate corresponding to the second light-emitting chip is greater than the dot density of the portion of the light guide plate corresponding to the first light-emitting chip.

6. The backlight module according to any one of claims 1 to 5, characterized in that, The light strip also includes a third light-emitting chip, which is disposed between the first light-emitting chip and the second light-emitting chip. The light emitted by the third light-emitting chip is the same as the light emitted by the first light-emitting chip. The wavelength of the light emitted by the third light-emitting chip is greater than the wavelength of the light emitted by the first light-emitting chip, and the wavelength of the light emitted by the third light-emitting chip is less than the wavelength of the light emitted by the second light-emitting chip.

7. A display device, characterized in that, It includes a display panel and a backlight module as described in any one of claims 1 to 6, wherein the backlight module is disposed on one side of the display panel.

8. The display device according to claim 7, characterized in that, The display panel includes a display area, and within the display area, the transmittance of the portion of the display panel corresponding to the second light-emitting chip is greater than the transmittance of the portion of the display panel corresponding to the first light-emitting chip.

9. The display device according to claim 8, characterized in that, Within the display area, the aperture ratio of the portion of the display panel corresponding to the second light-emitting chip is greater than the aperture ratio of the portion of the display panel corresponding to the first light-emitting chip.

10. The display device according to claim 9, characterized in that, The display area includes a first display sub-area on the side closer to the light strip and a second display sub-area on the side farther from the light strip. In the first display sub-area, the aperture ratio of the portion of the display panel corresponding to the second light-emitting chip is greater than the aperture ratio of the portion of the display panel corresponding to the first light-emitting chip. In the second display sub-area, the aperture ratio of the portion of the display panel corresponding to the second light-emitting chip is equal to the aperture ratio of the portion of the display panel corresponding to the first light-emitting chip.

11. The display device according to claim 10, characterized in that, Within the first display sub-region, the aperture ratio of the portion of the display panel corresponding to the area between the first light-emitting chip and the second light-emitting chip is less than the aperture ratio of the portion of the display panel corresponding to the second light-emitting chip, and the aperture ratio of the portion of the display panel corresponding to the area between the first light-emitting chip and the second light-emitting chip is greater than the aperture ratio of the portion of the display panel corresponding to the first light-emitting chip.

12. The display device according to claim 10, characterized in that, In any region of the display area, the aperture ratio of the portion of the display panel corresponding to the second light-emitting chip is greater than the aperture ratio of the portion of the display panel corresponding to the first light-emitting chip.

13. The display device according to claim 10, characterized in that, The width of the first display sub-area ranges from 2 mm to 3 mm.

14. A driving method for a display device, characterized in that, Driving the display device as described in any one of claims 7 to 13, the method for driving the display device includes: When the display device is enabled in DC dimming mode, the brightness change data of the display device is acquired; Based on the brightness change data, the display control parameters of the display device are adjusted to adjust the chromaticity of the display device, and the display device is controlled to display according to the adjusted display control parameters and chromaticity.

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