Display device

Abstract

The utility model relates to display equipment technical field discloses a kind of display equipment, comprising: display panel and the backlight module being set on display panel;Backlight module is divided into edge area and center area;Edge area is the backlight area in the preset width range adjacent to the four edges of display panel, and center area is the backlight area of the middle part except edge area;Edge area is laid with first LED light bar, and center area is laid with second LED light bar, and first LED chip of first model is integrated on first LED light bar, and second LED chip of second model is integrated on second LED light bar;Wherein, the wavelength of first LED chip is greater than the wavelength of second LED chip;First LED light bar and second LED light bar are respectively connected in respective backlight drive circuit.It solves the problem that the display picture edge appears luminance reduction and chroma inconsistency when display equipment works due to the homogeneous hardware layout structure of the backlight module of display equipment.

Description

Technical Field

[0001] This utility model relates to the field of display device technology, and in particular to a display device. Background Technology

[0002] Current display devices generally employ a homogeneous hardware layout for their backlight modules. This means that identical LED strips are deployed across the entire backlight module area, and all LED strips are driven uniformly by a single backlight driver circuit. While this "single driver + uniform arrangement" hardware architecture simplifies display device design, its physical structure inherently contains optical defects. Specifically, these structural design flaws cause reduced brightness and color inconsistencies at the edges of the displayed image during operation, resulting in visually visible dark edges or black borders. Summary of the Invention

[0003] This utility model provides a display device to solve the problem that the homogeneous hardware layout structure of the backlight module in existing display devices causes reduced brightness and inconsistent color at the edges of the displayed screen when the display device is working.

[0004] To address the aforementioned problems, this utility model provides a display device, comprising: Display panel and backlight module disposed on the display panel; The backlight module is divided into an edge region and a center region; the edge region is the backlight region within a preset width range adjacent to the four edges of the display panel, and the center region is the backlight region in the middle part excluding the edge region. The edge region is provided with a first LED light strip, and the center region is provided with a second LED light strip. The first LED light strip integrates a first LED chip of a first type, and the second LED light strip integrates a second LED chip of a second type. The wavelength of the first LED chip is greater than the wavelength of the second LED chip. The first LED light strip and the second LED light strip are respectively connected to their respective backlight driving circuits.

[0005] Optionally, the wavelength difference between the first LED chip and the second LED chip is 2.5nm-8.5nm.

[0006] Optionally, the backlight driving circuit includes a first backlight driving circuit and a second backlight driving circuit. The output terminal of the first backlight driving circuit is connected to the power input terminal of the first LED light strip; The output terminal of the second backlight driving circuit is connected to the power input terminal of the second LED light strip.

[0007] Optionally, the output current capability of the first backlight driving circuit is 1.0 to 1.5 times that of the output current capability of the second backlight driving circuit.

[0008] Optionally, the display device further includes a control unit; the control unit has a first control port and a second control port; The first control port is connected to the input terminal of the first backlight driving circuit; The second control port is connected to the input terminal of the second backlight driving circuit.

[0009] Optionally, the backlight driving circuit supports pulse width modulation digital dimming and analog dimming.

[0010] Optionally, the preset width range is less than or equal to 22cm.

[0011] Optionally, the edge region includes a plurality of spliced ​​first LED light strips, and the plurality of first LED light strips include at least two different length specifications of first LED light strips.

[0012] Optionally, the central area includes a plurality of spliced ​​second LED light strips, and the plurality of second LED light strips include at least one second LED light strip with different length specifications.

[0013] Optionally, the display device includes a direct-lit liquid crystal display device.

[0014] This utility model provides a display device, including: a display panel and a backlight module disposed on the display panel; the backlight module is divided into an edge region and a central region; the edge region is a backlight region within a predetermined width range adjacent to the perimeter of the display panel, and the central region is a backlight region in the middle portion excluding the edge region; a first LED strip is arranged in the edge region, and a second LED strip is arranged in the central region, wherein a first LED chip of a first type is integrated on the first LED strip, and a second LED chip of a second type is integrated on the second LED strip; wherein the wavelength of the first LED chip is greater than the wavelength of the second LED chip; the first LED strip and the second LED strip are respectively connected to their respective backlight driving circuits. This solution, by dividing the backlight module into an edge region and a central region, and using different types of LED strips arranged separately, while configuring independent backlight driving circuits for the two regions, achieves a differentiated design of the backlight module from a hardware structure perspective. This structural design can effectively compensate for light energy loss caused by differences in light transmission paths. At the same time, it corrects color deviation through wavelength difference design. Thus, while maintaining the thin design of the device, it effectively eliminates the problem of reduced brightness and inconsistent color at the edges of the display screen when the display device is working, which is caused by the homogeneous hardware layout structure of the backlight module of the display device. This improves the brightness uniformity and color consistency of the display screen. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a conventional display device according to one embodiment of the present invention; Figure 2 This is a schematic diagram of a display device according to one embodiment of the present invention; Figure 3 This is another schematic diagram of the display device in one embodiment of the present invention; Figure 4 This is another schematic diagram of the display device in one embodiment of the present invention.

[0017] The reference numerals in the attached figures are as follows: Display panel 100, backlight module 200; First LED light strip 201, first length LED light strip 2011, second length LED light strip 2012, third length LED light strip 2013, fourth length LED light strip 2014; Second LED light strip 202, fifth length LED light strip 2021; Edge region 203, center region 204, backlight driving circuit 300, first backlight driving circuit 301, second backlight driving circuit 302, control unit 400. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0019] Existing technology Current display devices generally use a homogeneous hardware layout structure for their backlight modules, such as Figure 1 As shown, specifically, LED strips of identical specifications are deployed across the entire area of ​​the backlight module (e.g., 24×10 LED strips), and all LED strips are uniformly controlled by a single backlight driver circuit. While this "single driver + uniform arrangement" hardware architecture simplifies display device design, its physical structure itself has inherent optical defects.

[0020] Specifically, due to the significant physical distance difference between the LED strips at the edge of the backlight module and the edge of the display panel, the light transmission path is longer, resulting in significant energy loss. Furthermore, the sloping structure of the display device, adopted to achieve a thinner profile, further alters the light propagation direction at the edge, causing uneven light distribution. In addition, the use of the same wavelength LED chips in all LED strips means that the edge and center areas lack differentiated optical characteristics to compensate for each other.

[0021] The above structural design causes the display device to experience reduced brightness and inconsistent color at the edges of the screen during operation, resulting in a visually visible dark edge or black frame.

[0022] Technical solution of this utility model This utility model provides a display device, including: a display panel 100 and a backlight module 200 disposed on the display panel 100; the backlight module 200 is divided into an edge region 203 and a central region 204; the edge region 203 is a backlight region within a predetermined width range adjacent to the four edges of the display panel 100, and the central region 204 is a backlight region in the middle part excluding the edge region 203; a first LED strip 201 is disposed in the edge region 203, and a second LED strip 202 is disposed in the central region 204, wherein a first LED chip of a first type is integrated on the first LED strip 201, and a second LED chip of a second type is integrated on the second LED strip 202; wherein the wavelength of the first LED chip is greater than the wavelength of the second LED chip; the first LED strip 201 and the second LED strip 202 are respectively connected to their respective backlight driving circuits 300.

[0023] This utility model solves the following prior art problems through the above-described progressive structural design: The first level: By physically dividing the backlight module 200 into an edge region 203 and a central region 204, a differentiated optical compensation basis is established. This partitioned layout provides a targeted hardware carrier for the optical needs of different regions.

[0024] The second layer employs an independent backlight driver circuit 300 design, creating a differentiated power supply architecture for the LED strips in the edge region 203 and the central region 204. This electrical isolation design at the hardware level ensures that the two regions can obtain their own independent driving conditions, allowing the edge region 203 to obtain stronger driving capabilities without affecting the normal operation of the central region 204. This structural design directly addresses the optical defects caused by the difference in transmission distance of the backlight LED chips and the sloped structure of the backplate. By enhancing the driving energy of the edge region 203, it effectively compensates for the brightness attenuation in that region, thereby improving the overall brightness uniformity of the display device, achieving a natural and smooth brightness transition in the displayed image, and enhancing the user experience.

[0025] The third layer: By configuring a first-type LED chip with a longer wavelength for the first LED strip 201 and a second-type LED chip with a shorter wavelength for the second LED strip 202, the difference in color coordinate characteristics exhibited when fluorescent materials or quantum dot films (QD, referring to a new type of fluorescent material composed of nanoscale semiconductor crystals) are excited by different wavelength light sources, physical compensation for color deviation is achieved. This wavelength differentiation design can effectively correct the color shift that may be caused by the increased brightness in the edge area, ensuring color consistency while achieving brightness balance, and ultimately obtaining a display screen with high uniformity.

[0026] In summary, based on the synergistic effect of the aforementioned three-layer structural design, this solution forms a complete technical effect chain: hardware partitioning establishes a compensation foundation → independent driving achieves brightness equalization → wavelength difference corrects chromaticity deviation. This "structure-drive-spectrum" three-in-one design effectively compensates for light energy loss caused by differences in transmission paths at the physical level. Simultaneously, while maintaining the thin design of the display device, it improves the brightness uniformity and chromaticity consistency of the displayed image, fundamentally solving the problem of edge brightness attenuation and chromaticity inconsistency caused by the homogeneous hardware layout structure of the backlight module 200, thus achieving a significant improvement in display quality. Furthermore, this utility model has a simple structure, is easy to implement, does not require large-scale hardware modifications to existing display devices, reduces production costs, and has high economic value and market application prospects.

[0027] Please refer to the following as well. Figures 2 to 4 This invention provides a display device.

[0028] In a first aspect, this utility model provides a display device, which includes a display panel 100 and a backlight module 200 disposed on the display panel 100. The backlight module 200 is physically divided into an edge region 203 and a central region 204. The edge region 203 is a backlight area within a predetermined width range adjacent to the four edges of the display panel 100; that is, it can be understood as an annular region within a predetermined width range adjacent to the four edges of the display panel 100. The central region 204 is a backlight area in the middle portion excluding the edge region 203; that is, it can be understood as the internal region enclosed by the central region 204. The backlight area can be a rectangular backlight area or a circular backlight area; the specific shape is determined according to the outer contour of the display panel 100 and is not limited here.

[0029] In one embodiment, a first LED light strip 201 is arranged in the edge region 203, and a second LED light strip 202 is arranged in the center region 204. The first LED light strip 201 integrates a first LED chip of a first type, and the second LED light strip 202 integrates a second LED chip of a second type. The wavelength of the first LED chip of the first type is greater than the wavelength of the second LED chip of the second type. That is, the first LED chip of the first type integrated in the first LED light strip 201 has a first wavelength, and the second LED chip of the second type integrated in the second LED light strip 202 has a second wavelength, and the first wavelength is greater than the second wavelength.

[0030] Specifically, the wavelength difference between the first LED chip and the second LED chip is 2.5nm-8.5nm, that is, the difference between the first wavelength and the second wavelength is 2.5nm-8.5nm, preferably 3.5nm, 5nm, or 7.5nm, without limitation. For example, in an embodiment of an 86-inch direct-lit LCD device, the wavelength of the first LED chip is 455nm and the wavelength of the second LED chip is 450nm, forming a wavelength difference of 5nm; in another embodiment, the wavelength of the first LED chip is 457.5nm and the wavelength of the second LED chip is 450nm, forming a wavelength difference of 7.5nm; or the wavelength of the first LED chip is 453.5nm and the wavelength of the second LED chip is 450nm, forming a wavelength difference of 3.5nm, which is only an example here.

[0031] It should be understood that the technical feature defined in this utility model, "the first LED strip 201 integrates a first LED chip of a first type, and the second LED strip 202 integrates a second LED chip of a second type," is essentially a hardware structural limitation based on the difference in the specific component models of the product. Further defining it by stating that "the wavelength of the first LED chip is greater than the wavelength of the second LED chip" clarifies its structural features by leveraging the inherent physical characteristics of the two different types of LED chips.

[0032] Specifically, this invention selects commercially available standard LED chips with different inherent wavelength parameters and integrates them as different hardware components into the first and second LED light strips to form a specific hardware structure. This selection of different wavelength chips and the differentiated configuration in the hardware structure make wavelength difference a definite and fixed structural feature of the backlight module of this product.

[0033] It should be noted that the technical solution of this utility model does not improve the material of the LED chip itself, but rather achieves structural innovation in the backlight module through the selection of standardized components and their specific configuration in the hardware structure. This product structure design based on component selection meets the protection requirements of a utility model patent.

[0034] To further verify the effectiveness of the wavelength difference design of this invention for color compensation, the inventors experimentally tested the optical performance of different LED chips within the same diaphragm group across different wavelength ranges. The tests used a standard diaphragm configuration: QD EQ300-E16 quantum dot film, POP LEF300XL-4 brightness enhancement film, and DBEF D3-260 reflective polarizer, combined with Huaxing OC (optical film). The color coordinates (x, y) and luminance values ​​(LV) were measured, and the data are shown in Table 1 below. Table 1 As can be seen from the data in Table 1, the x and y values ​​of the color coordinates gradually decrease as the wavelength of the LED chip increases, indicating a shift in color characteristics towards a warmer tone. This helps compensate for the potential chromaticity deviation in the edge region 203 due to increased brightness. For example, in the embodiment of this invention, a wavelength difference of 455nm (corresponding to the 452.5-455 nm range) and 450nm (corresponding to the 450-452.5 nm range) is used, changing the color coordinates from (0.3203, 0.3343) to (0.3177, 0.3294). This change effectively corrects the chromaticity difference between the edge region 203 and the central region 204. Simultaneously, the brightness value remains at a high level across different wavelengths, ensuring the uniformity and consistency of the display effect.

[0035] Therefore, the above experimental data fully demonstrates the feasibility and advantages of this invention in achieving chromaticity compensation through wavelength difference design, providing empirical support for hardware structure innovation.

[0036] It should be noted that the specific values ​​of the wavelength differences mentioned above are only illustrative examples. In actual product design, adjustments can be made according to the size and specifications of the display device, the structural characteristics of the backlight module 200, and the configuration of the optical film. These wavelength difference configurations based on the same structural principle should all be considered within the protection scope of this utility model.

[0037] In one embodiment, the first LED strip 201 and the second LED strip 202 are respectively connected to their respective backlight driving circuits 300. Specifically, the backlight driving circuit 300 may include the first backlight driving circuit 301 and the second backlight driving circuit 302; the output terminal of the first backlight driving circuit 301 is connected to the power input terminal of the first LED strip 201, and the output terminal of the second backlight driving circuit 302 is connected to the power input terminal of the second LED strip 202. This embodiment achieves independent driving of the LED strips in the edge region 203 and the center region 204 at the hardware level.

[0038] In summary, the present invention provides a display device comprising: a display panel 100 and a backlight module 200 disposed on the display panel 100; the backlight module 200 is divided into an edge region 203 and a central region 204; the edge region 203 is a backlight region within a predetermined width range adjacent to the periphery of the display panel 100, and the central region 204 is a backlight region in the middle portion excluding the edge region 203; a first LED strip 201 is disposed in the edge region 203, and a second LED strip 202 is disposed in the central region 204, wherein the first LED strip 201 integrates a first LED chip of a first type, and the second LED strip 202 integrates a second LED chip of a second type; wherein the wavelength of the first LED chip is greater than the wavelength of the second LED chip; the first LED strip 201 and the second LED strip 202 are respectively connected to their respective backlight driving circuits 300. This solution divides the backlight module 200 into an edge region 203 and a central region 204, and uses different types of LED strips for each region. It also provides independent backlight driving circuits 300 for each region, achieving a differentiated design of the backlight module 200 from a hardware perspective. This structural design effectively compensates for light energy loss caused by differences in light transmission paths. Furthermore, it corrects color deviations through wavelength difference design. Thus, while maintaining a slim design, it effectively eliminates the problem of reduced brightness and inconsistent color at the edges of the displayed image caused by a homogeneous hardware layout in the backlight module 200, thereby improving the brightness uniformity and color consistency of the displayed image.

[0039] In one embodiment, the output current capability of the first backlight driving circuit 301 is configured to be 1.0 to 1.5 times the output current capability of the second backlight driving circuit 302. Hardware implementation schemes for this current capability ratio include, but are not limited to, the following two implementation methods: In the first embodiment, the first backlight driving circuit 301 and the second backlight driving circuit 302 use the same type of constant current driving chip, and differentiate their output current capabilities by configuring current setting resistors with different resistance values. Specifically, the second backlight driving circuit 302 achieves an output current of 300mA by configuring a current setting resistor of 1.2Ω, while the first backlight driving circuit 301 achieves an output current of 360mA by configuring a current setting resistor of 1.0Ω, forming a precise 1.2 times current ratio. In practical applications, by adjusting the resistance value of the current setting resistor, different current ratios such as 1.1 times, 1.3 times, or 1.5 times can be achieved, which is not limited here.

[0040] In the second embodiment, the difference in current capability can be directly achieved by selecting different specifications of driver chips. For example, the first backlight driver circuit 301 selects a constant current driver chip with a maximum output current of 500mA, and the second backlight driver circuit 302 selects a constant current driver chip with a maximum output current of 400mA, forming an inherent current ratio of 1.25.

[0041] The technical effects of this hardware configuration are mainly reflected in three aspects: First, through the differentiated current driving capability design, the edge region 203 obtains a stronger light output capability than the central region 204, directly compensating for the light energy loss caused by the difference in transmission path; second, the use of fixed hardware parameter configuration ensures the stability of the current ratio relationship, and continuous and reliable brightness compensation can be achieved without relying on external control; finally, the discrete driving architecture effectively avoids mutual interference between regions.

[0042] It should be noted that the above current ratio parameters and specific implementation schemes are only illustrative examples. In actual products, they can be adapted to the size specifications and optical requirements of the display device. These parameter changes based on the same hardware differentiated design principle should all be considered within the protection scope of this utility model.

[0043] In one embodiment, such as Figure 2 As shown, the display device also includes a control unit 400; the control unit 400 has a first control port and a second control port; wherein, the first control port can be connected to the input terminal of the first backlight driving circuit 301 through a first control line, and the second control port can be connected to the input terminal of the second backlight driving circuit 302 through a second control line. In this embodiment, through the hardware-level port discrete design and physical isolation of the control lines, the signal integrity between the two control channels is ensured from the electrical connection essence, effectively avoiding mutual interference, and realizing completely independent and precise control of the backlight driving circuits 300 of the edge region 203 and the center region 204.

[0044] The control unit 400 can input a first control signal (e.g., a first pulse width modulation digital dimming signal (PWM1) or a first analog dimming signal (DC1)) to the first backlight driving circuit 301 through the first control port, and can input a second control signal (e.g., a second pulse width modulation digital dimming signal (PWM1) or a second analog dimming signal (DC1)) to the second backlight driving circuit 302 through the second control port, which is not limited here.

[0045] It should be noted that the number of control ports included in the control unit 400, the specific wiring method of each control line on the PCB board (such as wiring layer arrangement, line width and line spacing settings), and the physical interface specifications adopted can all be adaptively adjusted according to the actual product architecture layout and drive requirements. These changes based on the same structural principle and connection relationship should all be considered within the protection scope of this utility model.

[0046] In one embodiment, such as Figure 2 As shown, the backlight driver circuit 300 is configured to support both pulse width modulation (PWM) digital dimming and analog dimming (DC) modes, without limitation here. Specifically, this can be achieved by using a constant current driver chip that supports dual-mode dimming. The PWM pin of this constant current driver chip receives pulse width modulation signals with a frequency range of 100Hz-20kHz for digital dimming, while its DIM pin receives analog DC voltage signals from 0V to 3.3V for analog dimming. The two dimming modes can be physically switched using a hardware jumper. When the jumper is connected to the first set of pins, the PWM digital dimming mode is enabled; when connected to the second set of pins, the mode is switched to analog dimming. This hardware-level dual-mode design provides flexible dimming options for different application scenarios, maintaining the compact structure of the driver circuit while ensuring that all dimming parameters are fixedly set through the hardware circuit, achieving stable dimming functionality without relying on software programming.

[0047] It should be noted that the frequency range of the PWM signal, the voltage range of the analog dimming, and the specific implementation method of mode switching can all be adjusted according to the selection of the actual driver chip and system requirements. These changes in hardware implementation methods based on the same dual-mode dimming principle should all be considered within the protection scope of this utility model.

[0048] In one embodiment, the preset width range is less than or equal to 22cm, that is, the preset width range of the edge region 203 from the four edges of the display panel 100 is less than or equal to 22cm, preferably 10cm-20cm. The preset width of the edge region 203 from the four edges of the display panel 100 can be any value within the preset width range, for example, it can be specifically implemented as 15cm or 17cm. This preset width can be achieved through the metal backplate stamping process of the backlight module 200, forming a ring-shaped mounting area of ​​constant width around the metal backplate, providing a structural basis for the placement of the first LED light strip 201.

[0049] By designing this preset width range, it is ensured that display devices of different sizes have adequate space in their edge areas 203 to arrange the first LED light strip 201, providing the necessary physical conditions for compensating for edge light energy loss. For example, in an implementation of a 55-inch display device, the preset width can be set to 18cm; in a 75-inch display device, it can be set to 15cm; and in 86-inch and 98-inch display devices, a design value of 22cm can be used to accommodate the brightness compensation requirements of larger sizes.

[0050] It should be noted that the specific value of the preset width can be adjusted within a range of less than or equal to 22cm according to the actual size of the display device and optical requirements. These size changes based on the same design principle should all be considered within the protection scope of this utility model.

[0051] In one embodiment, the edge backlight area includes a plurality of spliced ​​first LED light strips 201, and the plurality of first LED light strips 201 include at least two different length specifications. Specifically, it may include at least the following two optional splicing implementation methods: In the first splicing method, such as Figure 3 As shown, a first-length LED strip 2011 of a first length specification and a second-length LED strip 2012 of a second length specification are combined. These two types of strips are arranged according to a first preset layout and spliced ​​together by connectors to jointly form the backlight area of ​​the edge region 203.

[0052] In the second splicing method, such as Figure 4 As shown, a third-length LED light strip 2013 of a first-length specification and a fourth-length LED light strip 2014 of a second-length specification are combined. These two types of light strips are arranged according to a second preset layout and spliced ​​together by connectors to form the backlight area of ​​the edge region 203.

[0053] Correspondingly, in one embodiment, such as Figure 3 and Figure 4 As shown, the central backlight area includes multiple spliced ​​second LED light strips 202, and the multiple second LED light strips 202 include at least one second LED light strip 202 of different length specifications. Specifically, the second LED light strips 202 can adopt a single length specification. For example, a fifth length LED light strip 2021 is used. The fifth length LED light strip 2021 is arranged in the central area 204 according to a third preset layout (usually a matrix arrangement) to form the backlight area of ​​the central area 204.

[0054] In a preferred embodiment, the first splicing method of the edge region 203 can be combined with the splicing method of the center region 204, wherein the fifth length LED strip 2021 and the second length LED strip 2012 can use the same length specification. This design can effectively reduce the types of materials and lower production costs. That is, it can also be understood as... Figure 3 Plans and Figure 4 The solution achieves the same adjustment effect, but Figure 4 The solution requires the use of three different lengths of LED light strips in production, and Figure 3 Only two solutions are required. Considering the complexity of production and application requirements, this implementation method is the preferred choice. Figure 3 The proposed scheme is shown.

[0055] In practical applications, such as Figure 3 and Figure 4 As shown, the outermost two LED chips in each row of LED strips can be used to form the backlight area of ​​edge region 203, while the remaining LED chips are assigned to the backlight area of ​​center region 204. It should be understood that this division method can be adjusted according to the actual uniformity difference. For example, one, three, or four LEDs can be used to set the range of the edge region, which is not limited here.

[0056] It should be noted that the specific length specifications of the LED light strips, the proportion of different specifications of light strips, and their arrangement in their respective areas can all be adjusted according to the size specifications and backlight requirements of the display device. These changes based on the same splicing design principle should all be considered within the protection scope of this utility model.

[0057] In one embodiment, the display device includes a direct-lit liquid crystal display device. The direct-lit liquid crystal display device can be a liquid crystal display product employing direct-lit backlight technology, including but not limited to LCD TVs and LCD monitors, etc., and is not limited thereto.

[0058] Secondly, a method for adjusting a display device is provided, applied to the display device of the first aspect, the method comprising the following steps: S1: Brightness Detection When the display device displays a standard white field image, the brightness of the edge area 203 and the center area 204 are detected by a brightness detection device to obtain the brightness value of the edge area 203 and the brightness value of the center area 204.

[0059] As an example, the brightness of the edge region 203 and the center region 204 can be detected by a color analyzer to obtain the brightness values ​​of the edge region 203 and the center region 204. For example, the brightness value of the edge region 203 is 280 nits and the brightness value of the center region 204 is 380 nits.

[0060] S2: Target brightness calculation The brightness values ​​of the edge region 203 and the center region 204 are transmitted to the control unit 400. The control unit 400 calculates the target brightness value of the edge region 203 as the target brightness value of the edge region 203 and the target brightness value of the center region 204 as the target brightness value of the center region 204 according to the preset uniformity standard.

[0061] As an example, the control unit 400 can calculate the target brightness value of the edge region 203 and the target brightness value of the center region 204 based on a preset uniformity standard (e.g., requiring an overall uniformity of over 90%) using the formula: Target Brightness = (Brightness of Edge Region 203 + Brightness of Center Region 204) × Uniformity Coefficient. For example, both the target brightness values ​​of the edge region 203 and the center region 204 are 350 nits. The uniformity coefficient can be set to 0.45-0.95 depending on the display device specifications, preferably 0.55, 0.65, 0.75, or 0.92, and is not limited here.

[0062] S3: Driving parameter calculation The control unit 400 calculates the first drive current adjustment parameter of the edge region 203 based on the difference between the brightness value of the edge region 203 and the target brightness value of the edge region 203; The control unit 400 calculates the second drive current adjustment parameter of the central region 204 based on the difference between the brightness value of the central region 204 and the target brightness value of the central region 204.

[0063] As an example, the calculation process is as follows: The brightness value that the edge region 203 needs to increase is 350 nits + 280 nits = 70 nits; the brightness value that the center region 204 needs to decrease is 380 nits + 350 nits = 30 nits. Based on the relationship between brightness and drive current (for example, an increase of approximately 0.714 mA of current is required to increase brightness by 1 nit), the control unit 400 calculates: First drive current adjustment parameter: The drive current of edge region 203 needs to be increased from the initial 300 mA to 350 mA (adjustment amount is +50 mA). Second drive current adjustment parameter: The drive current of the central region 204 needs to be reduced from the initial 300 mA to 320 mA (adjustment amount is -20 mA).

[0064] S4: Drive Adjustment The control unit 400 sends a first adjustment signal to the first backlight driving circuit 301 according to the first drive current adjustment parameter, which is used to adjust the first output current of the first backlight driving circuit 301. The control unit 400 sends a second adjustment signal to the second backlight driving circuit 302 according to the second drive current adjustment parameter, so as to adjust the second output current of the second backlight driving circuit 302.

[0065] As an example, the control unit 400 sends a first adjustment signal to the first backlight driving circuit 301 through the first control port to increase the first driving current of the edge region 203 from 300 mA to 350 mA; and sends a second adjustment signal to the second backlight driving circuit 302 through the second control port to reduce the second output current of the center region 204 from 300 mA to 320 mA.

[0066] The first adjustment signal may include a first pulse width modulation digital dimming signal (PWM1) or a first analog dimming signal (DC1), and the second adjustment signal may include a second pulse width modulation digital dimming signal (PWM2) or a second analog dimming signal (DC2). In the pulse width modulation digital dimming mode, the output current can be controlled by adjusting the duty cycle of the PWM; in the analog dimming mode, the output current can be controlled by adjusting the DC voltage value. No specific limitations are imposed here.

[0067] S5: Iterative Optimization Repeat steps S1-S4, and through a closed-loop control process of multiple detection-calculation-adjustment, until the overall uniformity of the displayed image reaches the preset standard.

[0068] As an example, after adjustment, the brightness of both the edge area 203 and the center area 204 reached the range of 320 nits-350 nits, significantly improving the overall uniformity of the display and effectively solving the problem of black borders at the edges.

[0069] It should be noted that the specific parameters and implementation methods mentioned above are merely examples, and any common variations and substitutions made by those skilled in the art within the scope of this technical solution should be included within the protection scope of this utility model.

[0070] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A display device, characterized in that, include: Display panel and backlight module disposed on the display panel; The backlight module is divided into an edge region and a center region; The edge region is a backlight region within a preset width range adjacent to the four edges of the display panel, and the center region is the backlight region in the middle part excluding the edge region. The edge region is provided with a first LED light strip, and the center region is provided with a second LED light strip. The first LED light strip integrates a first LED chip of a first type, and the second LED light strip integrates a second LED chip of a second type. The wavelength of the first LED chip is greater than the wavelength of the second LED chip. The first LED light strip and the second LED light strip are respectively connected to their respective backlight driving circuits.

2. The display device according to claim 1, characterized in that, The wavelength difference between the first LED chip and the second LED chip is 2.5nm-8.5nm.

3. The display device according to claim 1, characterized in that, The backlight driving circuit includes a first backlight driving circuit and a second backlight driving circuit. The output terminal of the first backlight driving circuit is connected to the power input terminal of the first LED light strip; The output terminal of the second backlight driving circuit is connected to the power input terminal of the second LED light strip.

4. The display device according to claim 3, characterized in that, The output current capability of the first backlight driving circuit is 1.0 to 1.5 times that of the output current capability of the second backlight driving circuit.

5. The display device according to claim 3, characterized in that, The display device further includes a control unit; the control unit has a first control port and a second control port; The first control port is connected to the input terminal of the first backlight driving circuit; The second control port is connected to the input terminal of the second backlight driving circuit.

6. The display device according to claim 1, characterized in that, The backlight driving circuit supports both pulse width modulation digital dimming and analog dimming.

7. The display device according to claim 1, characterized in that, The preset width range is less than or equal to 22cm.

8. The display device according to claim 1, characterized in that, The edge region includes multiple spliced ​​first LED light strips, and the multiple first LED light strips include at least two different length specifications of first LED light strips.

9. The display device according to claim 1, characterized in that, The central area includes multiple spliced ​​second LED light strips, and the multiple second LED light strips include at least one second LED light strip with different length specifications.

10. The display device according to any one of claims 1-9, characterized in that, The display device includes a direct-lit liquid crystal display device.

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