Display module
By using independently adjustable light-emitting devices in lamp beads in the display module, the problem that traditional display modules cannot adjust brightness and color temperature is solved, and circadian rhythm adjustment of brightness and color temperature is achieved, reducing interference with the human body clock and improving picture quality.
Patent Information
- Application Number
- CN202511044454.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-28
- Publication Date
- 2025-09-16
AI Technical Summary
The light emitted by traditional display modules cannot achieve circadian rhythm regulation of brightness or color temperature, which interferes with the human body's biological clock.
The backlight module contains multiple lamp beads, each of which is equipped with a first light-emitting device and a second light-emitting device. The two emit light of the same color but different wavelengths. The brightness or color temperature is adjusted by independently controlling the current and duty cycle of the device to achieve circadian rhythm regulation.
Automatic adjustment of the display module's brightness and color temperature is achieved, reducing interference with the human body's biological clock, improving picture quality and avoiding light and shadow problems.
Smart Images
Figure CN120652707A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of display technology, and in particular to a display module. Background Art
[0002] The human body's biological clock is affected by the brightness and color temperature of light. Natural light is high in brightness and color temperature during the day, which suppresses melatonin secretion in the body and maintains wakefulness. At night, it changes to low brightness and low color temperature, which increases melatonin secretion and promotes sleep.
[0003] The light emitted by traditional display modules cannot achieve circadian rhythm regulation of brightness or color temperature, which interferes with the human body's biological clock. Summary of the Invention
[0004] The embodiments of the present application provide a display module to solve the technical problem that the light emitted by the display module cannot achieve circadian rhythm adjustment of brightness or color temperature.
[0005] In order to achieve the above object, a display module is provided, comprising:
[0006] A backlight module, the backlight module comprising a plurality of lamp beads, the lamp beads comprising a first light-emitting device and a second light-emitting device, the first light-emitting device and the second light-emitting device being adapted to emit light of the same color, the lamp beads comprising a bracket and fluorescent glue, the first light-emitting device and the second light-emitting device being disposed in the same bracket, and the fluorescent glue covering the first light-emitting device and the second light-emitting device;
[0007] The first light emitting device and the second light emitting device are suitable for emitting light independently, and the wavelength of the color light of the first light emitting device is greater than the wavelength of the color light of the second light emitting device.
[0008] Optionally, the first light emitting device and the second light emitting device are configured to emit blue light.
[0009] Optionally, the lamp bead includes a first pin and a second pin connected to the first light-emitting device, and a third pin and a fourth pin connected to the second light-emitting device.
[0010] Optionally, the display module further includes: a control module electrically connected to the first light emitting device and the second light emitting device;
[0011] The control module is used to independently control the first light emitting device and the second light emitting device, and the wavelength of the color light of the first light emitting device is greater than the wavelength of the color light of the second light emitting device.
[0012] Optionally, the control module is used to adjust the current and / or duty cycle of at least one of the first light-emitting device and the second light-emitting device.
[0013] Optionally, the control module is configured to reduce the current or duty cycle of the first light emitting device and increase the current or duty cycle of the second light emitting device in the first mode; or,
[0014] The control module is configured to increase the current or duty cycle of the first light emitting device and decrease the current or duty cycle of the second light emitting device in the second mode.
[0015] Optionally, the first mode is a constant-brightness diurnal rhythm mode, and the second mode is a constant-brightness nighttime rhythm mode.
[0016] Optionally, the control module is configured to increase the current or duty cycle of the first light emitting device and increase the current or duty cycle of the second light emitting device in the third mode to increase the brightness of the display module; or,
[0017] The control module is configured to reduce the current or duty cycle of the first light emitting device and reduce the current or duty cycle of the second light emitting device in the fourth mode, so as to reduce the brightness of the display module.
[0018] Optionally, the third mode is a constant color temperature daytime rhythm mode, and the fourth mode is a constant color temperature nighttime rhythm mode.
[0019] Optionally, when the brightness of the display module is less than a first threshold, the control module is configured to reduce or increase the current of the first light-emitting device, and reduce or increase the current of the second light-emitting device, so as to adjust the color temperature and / or brightness of the display module;
[0020] When the brightness of the display module is greater than or equal to the first threshold, the control module is used to reduce or increase the duty cycle of the first light-emitting device, and reduce or increase the duty cycle of the second light-emitting device, so as to adjust the color temperature and / or brightness of the display module.
[0021] In the display module of the embodiment of the present application, by setting the lamp beads to include a first light-emitting device and a second light-emitting device that can independently emit light of the same color, and the wavelength of the color light of the first light-emitting device is greater than the wavelength of the color light of the second light-emitting device, the color temperature or brightness of the display module can be adjusted by adjusting at least one of the first light-emitting device and the second light-emitting device, thereby realizing circadian rhythm adjustment of the brightness or color temperature.
[0022] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.
[0024] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.
[0025] Figure 1A is a schematic top view of a backlight module provided in an exemplary embodiment of the present disclosure;
[0026] Figure 1B for Figure 1A Schematic diagram of the cross-section structure at CC;
[0027] Figure 2 yes Figure 1A Schematic diagram of the cross-sectional structure of the middle lamp bead;
[0028] Figure 3 is a schematic structural diagram of a display module provided in an exemplary embodiment of the present disclosure;
[0029] Figure 4 This is a schematic diagram of the connection relationship between a control module, a first light-emitting device, and a second light-emitting device of a display module provided in an exemplary embodiment of the present disclosure;
[0030] Figure 5 A spectrum change diagram of a display module provided in an exemplary embodiment of the present disclosure;
[0031] Figure 6 This is another spectrum change diagram of the display module provided in the exemplary embodiment of the present disclosure.
[0032] Description of reference numerals:
[0033] 1- Backlight module;
[0034] 11-lamp bead; 111-first light-emitting device; 112-second light-emitting device; 113-bracket; 114-fluorescent adhesive; 115-crystal bonding material; 116-bonding wire; 1171-first pin; 1172-second pin; 1173-third pin; 1174-fourth pin; 118-circuit board;
[0035] 12-optical film;
[0036] 13- back plate;
[0037] 14-reflective sheet;
[0038] 15-light guide plate;
[0039] 2-display module; 3-display panel;
[0040] 21-Control module. DETAILED DESCRIPTION
[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0042] like Figures 1A to 3 As shown, a display module 2 is provided, including a backlight module 1, the backlight module 1 includes a plurality of lamp beads 11, the lamp beads 11 include a first light-emitting device 111 and a second light-emitting device 112, the first light-emitting device 111 and the second light-emitting device 112 are suitable for emitting light of the same color, the lamp bead 11 includes a bracket 113 and a fluorescent glue 114, the first light-emitting device 111 and the second light-emitting device 112 are arranged in the same bracket 113, and the fluorescent glue 114 covers the first light-emitting device 111 and the second light-emitting device 112; wherein the first light-emitting device 111 and the second light-emitting device 112 are suitable for independent light emission, and the color light wavelength of the first light-emitting device 111 is greater than the color light wavelength of the second light-emitting device 112.
[0043] In some embodiments, the lamp bead 11 can be an LED, a Mini-LED, etc.
[0044] In some embodiments, the first light-emitting device 111 and the second light-emitting device 112 emit light of the same color. For example, the first light-emitting device 111 and the second light-emitting device 112 may both emit blue light, or the first light-emitting device 111 and the second light-emitting device 112 may both emit red light, or the first light-emitting device 111 and the second light-emitting device 112 may both emit green light, but the present invention is not limited thereto.
[0045] The first light-emitting device 111 and the second light-emitting device 112 can be light-emitting chips. The light-emitting chip can be composed of a P-type layer, an N-type layer, and a light-emitting layer (quantum well). When current passes through the light-emitting chip, electrons and holes recombine in the quantum well, releasing energy and generating light of a specific wavelength (such as blue light or red light). The size of the light-emitting chip can range from tens of microns to hundreds of microns.
[0046] The wavelength of the color light emitted by first light-emitting device 111 is greater than the wavelength of the color light emitted by second light-emitting device 112. This means that when both first light-emitting device 111 and second light-emitting device 112 emit blue light, the wavelength of the blue light emitted by first light-emitting device 111 is greater than the wavelength of the blue light emitted by second light-emitting device 112. The wavelength of blue light ranges from 400 nanometers to 495 nanometers. Specifically, the wavelength of short-wave blue light ranges from 400 nanometers to 450 nanometers, while the wavelength of long-wave blue light ranges from 450 nanometers to 495 nanometers.
[0047] In some embodiments, the color light emitted by the first light-emitting device 111 is long-wave blue light, and the color light emitted by the second light-emitting device 112 is short-wave blue light. For example, the blue light wavelength of the first light-emitting device 111 is 465 nanometers, and the blue light wavelength of the second light-emitting device 112 is 405 nanometers, but the present invention is not limited thereto. The wavelengths of the first light-emitting device 111 and the second light-emitting device 112 can also be other wavelengths within the blue light band.
[0048] When the first light emitting device 111 and the second light emitting device 112 both emit red light, the wavelength of the red light of the first light emitting device 111 is greater than the wavelength of the red light of the second light emitting device 112. The wavelength of the red light ranges from 620 nanometers to 750 nanometers.
[0049] When both the first light-emitting device 111 and the second light-emitting device 112 emit green light, the wavelength of the green light of the first light-emitting device 111 is greater than the wavelength of the green light of the second light-emitting device 112. The wavelength of green light ranges from 495 nanometers to 570 nanometers. A similar configuration applies when the first light-emitting device 111 and the second light-emitting device 112 emit light of other colors.
[0050] like Figure 2 As shown, the first light-emitting device 111 and the second light-emitting device 112 are adapted to emit light independently. This means that, in a single lamp bead 11, the first light-emitting device 111 can emit light independently while the second light-emitting device 112 does not. Alternatively, the first light-emitting device 111 can not emit light while the second light-emitting device 112 emits light independently. Alternatively, both the first light-emitting device 111 and the second light-emitting device 112 emit light.
[0051] In the display module 2 of the embodiment of the present application, by setting the lamp bead 11 to include a first light-emitting device 111 and a second light-emitting device 112 that can independently emit light of the same color, and the wavelength of the color light of the first light-emitting device 111 is greater than the wavelength of the color light of the second light-emitting device 112, the color temperature or brightness of the display module 2 can be adjusted by adjusting at least one of the first light-emitting device 111 and the second light-emitting device 112, thereby realizing circadian rhythm adjustment of the brightness or color temperature.
[0052] Optionally, the first light emitting device 111 and the second light emitting device 112 are configured to emit blue light, that is, the wavelength of the color light of the first light emitting device 111 and the second light emitting device 112 is in the range of 400 nanometers to 495 nanometers.
[0053] The bracket 113 forms a cup-shaped or flat-plate-shaped groove for fixing the first light emitting device 111 and the second light emitting device 112 and providing overall structural support.
[0054] It should be noted that there is no bracket 113 separating the first light-emitting device 111 and the second light-emitting device 112, and the first light-emitting device 111 and the second light-emitting device 112 are packaged with a common fluorescent glue 114. In the related art, two different lamp beads 11 are arranged alternately in the backlight module 1. One of the lamp beads 11 is selected to light up in different scenes, which makes it difficult for the light guide plate 15 to match the positions of the two lamp beads 11, resulting in problems such as lamp shadows and dark corners, and the picture quality is poor. In the present application, there is no bracket 113 separating the first light-emitting device 111 and the second light-emitting device 112, and they are packaged with a common fluorescent glue 114, which can improve the matching of optical components such as the light guide plate 15 to the lamp beads 11 and improve the picture quality.
[0055] In some embodiments, the material of the bracket 113 is copper alloy, iron-nickel alloy, etc.
[0056] In some embodiments, the fluorescent paste 114 includes a variety of phosphors. These phosphors are made of photoexcitable materials such as nitrogen oxides, sulfides, silicates, and nitrides. The colored light emitted by the first and second light-emitting devices 111 and 112 passes through the fluorescent paste 114 to form white light. This means that the light emitted by the backlight module 1 is white light.
[0057] The lamp bead 11 includes a first pin 1171 and a second pin 1172 connected to the first light-emitting device 111, and a third pin 1173 and a fourth pin 1174 connected to the second light-emitting device 112. The first and second pins 1171 and 1172 can independently input current to the first light-emitting device 111, thereby independently emitting light. The current of the first light-emitting device 111 can also be independently adjusted. The third and fourth pins 1173 and 1174 can independently input current to the second light-emitting device 112, thereby independently emitting light. The currents of the third and fourth pins 1173 and 1174 can also be independently adjusted.
[0058] The lamp bead 11 also includes a bonding material 115, which can fix the first light emitting device 111 and the second light emitting device 112 to the bottom of the bracket 113 to ensure mechanical stability. The bonding material 115 can be silver glue, eutectic solder, sintered silver, etc.
[0059] The lamp bead 11 further includes a bonding wire 116. The bonding wire 116 is used to weld the electrode of the first light emitting device 111 to the bracket 113, and to weld the electrode of the second light emitting device 112 to the bracket 113, thereby forming a current loop. The bonding wire 116 can be a gold wire, a copper wire, an aluminum wire, or the like.
[0060] In some embodiments, as Figure 1B As shown, the backlight module 1 can be an edge-lit backlight. The backlight module 1 includes a reflective sheet 14, a light guide plate 15, and an optical film 12, which are stacked in sequence. Multiple lamp beads 11 are positioned corresponding to the sidewalls of the light guide plate 15. Light emitted from the lamp beads 11 is incident on the sidewalls of the light guide plate 15, and then transmitted through the light guide plate 15 to the entire plane of the light guide plate 15, thereby forming a planar light source.
[0061] The backlight module 1 further includes a circuit board 118, and a plurality of lamp beads 11 are fixed on the circuit board 118. The circuit board 118 can be a flexible printed circuit board (FPC) or a printed circuit board (PCB).
[0062] In some embodiments, the light guide plate 15 may be made of a transparent polymer material, such as polymethyl methacrylate (PMMA) or polycarbonate (PC).
[0063] The reflective sheet 14 is disposed on one side of the light guide plate 15. The reflective sheet 14 is mainly used to reflect the light emitted from the bottom of the light guide plate 15 back into the light guide plate 15 so that it can be concentrated and emitted from the front of the light guide plate 15, thereby reducing light loss and increasing the light source efficiency of the backlight module 1.
[0064] The optical film 12 is positioned on the other side of the light guide plate 15. The optical film 12 may include a diffuser sheet and a prism sheet, stacked in sequence. The diffuser sheet diffusely reflects light emitted from the light guide plate 15, evenly distributing it on the light-emitting surface and effectively homogenizing the light. The prism sheet is positioned on the side of the diffuser sheet away from the light guide plate 15. By using the principles of refraction and reflection, the prism sheet corrects the direction of light, focusing scattered light toward the front, thereby increasing the brightness of the backlight module 1.
[0065] In some embodiments, as Figure 1B As shown, the backlight module 1 further includes a back plate 13, which is used to fix the lamp beads 11, the reflective sheet 14, the light guide plate 15 and the optical film 12, etc., to ensure the structural stability of the backlight module 1, while also playing a certain light shielding and protective role.
[0066] In some embodiments, the back plate 13 may be made of metal, such as iron, aluminum, etc.
[0067] In other embodiments, the backlight module 1 may be a direct-lit backlight module 1. A plurality of lamp beads 11 may be arranged in an array, and light emitted from the lamp beads 11 is incident on the optical film 12 and emitted from a surface of the optical film 12 away from the lamp beads 11.
[0068] Optionally, the display module 2 also includes a control module 21, which is electrically connected to the first light-emitting device 111 and the second light-emitting device 112; wherein the control module 21 is used to independently control the first light-emitting device 111 and the second light-emitting device 112, and the color light wavelength of the first light-emitting device 111 is greater than the color light wavelength of the second light-emitting device 112.
[0069] In some embodiments, the control module 21 may be a system on chip (SOC). The control module 21 is electrically connected to the lamp bead 11 and is used to control the lamp bead 11 to emit light.
[0070] like Figure 4 As shown, the control module 21 is used to control the light emission of the lamp bead 11. For example, the control module 21 can make the first light-emitting device 111 in the lamp bead 11 emit light, and the second light-emitting device 112 not emit light; or, the control module 21 can make the first light-emitting device 111 in the lamp bead 11 not emit light, and the second light-emitting device 112 emit light; or, the control module 21 can make both the first light-emitting device 111 and the second light-emitting device 112 in the lamp bead 11 emit light.
[0071] By controlling the light emission of the first light emitting device 111 and the second light emitting device 112, the color temperature or brightness of the display module 2 can be adjusted by adjusting at least one of the first light emitting device 111 and the second light emitting device 112, thereby realizing circadian rhythm adjustment of the brightness or color temperature of the display module 2.
[0072] like Figure 3 As shown, the display module 2 further includes a display panel 3, which can be a non-self-luminous panel, such as an LCD panel. The display panel 3 is arranged on the light-emitting side of the backlight module 1. The light emitted from the backlight module 1 can illuminate the display panel 3, providing a white light source for the display panel 3.
[0073] Optionally, the control module 21 is configured to adjust the current and / or duty cycle of at least one of the first light-emitting device 111 and the second light-emitting device 112 to adjust the brightness and / or color temperature of the display module 2 .
[0074] The brightness of the light-emitting device is positively correlated with the current. When the current increases, the brightness of the light-emitting device also increases, and when the current decreases, the brightness of the light-emitting device also decreases.
[0075] The brightness of a light-emitting device is positively correlated with its duty cycle. As the duty cycle increases, the brightness of the device increases, while as the duty cycle decreases, the brightness of the device decreases. The duty cycle refers to the ratio of the power-on time to the total power-off time within a pulse cycle. For example, if the power-on time within a cycle T is T / 4 and the power-off time is 3T / 4, the duty cycle is 25%.
[0076] Since the wavelength of the color light of the first light-emitting device 111 is different from the wavelength of the color light of the second light-emitting device 112, when the current and / or duty cycle in the first light-emitting device 111 and / or the second light-emitting device 112 changes, the spectrum of the display module 2 will also change, thereby changing the color temperature of the display module 2.
[0077] The following description will be made by taking an example in which the color light of the first light emitting device 111 is long-wave blue light and the color light of the second light emitting device 112 is short-wave blue light.
[0078] like Figure 5 and Figure 6 2 are two spectrum change diagrams of the display module 2 provided in an exemplary embodiment of the present disclosure. Figure 5 and Figure 6 In the figure, the horizontal axis is the wavelength in nanometers; the vertical axis is the spectral radiance in W / (m 2 ·sr·nm), spectral radiance represents the light power per unit area, per unit wavelength interval, and per unit solid angle.
[0079] like Figure 6 As shown, when the current of the first light-emitting device 111 increases and the current of the second light-emitting device 112 decreases, the proportion of long-wave blue light in the color light increases and the proportion of short-wave blue light decreases. The main peak of the blue light of the lamp bead 11 moves to the right, and the main peak of the blue light of the display module 2 moves to the right.
[0080] like Figure 5 As shown, when the current of the first light-emitting device 111 decreases and the current of the second light-emitting device 112 increases, the proportion of long-wave blue light in the color light decreases, and the proportion of short-wave blue light increases. The main peak of the blue light of the lamp bead 11 moves to the left, and the main peak of the blue light of the display module 2 moves to the left.
[0081] like Figure 6 As shown, when the duty cycle of the first light-emitting device 111 increases and the duty cycle of the second light-emitting device 112 decreases, the proportion of long-wave blue light in the color light increases and the proportion of short-wave blue light decreases. The main peak of the blue light of the lamp bead 11 moves to the right, and the main peak of the blue light of the display module 2 moves to the right.
[0082] like Figure 5As shown, when the duty cycle of the first light-emitting device 111 decreases and the duty cycle of the second light-emitting device 112 increases, the proportion of long-wave blue light in the color light decreases and the proportion of short-wave blue light increases. The main peak of the blue light of the lamp bead 11 moves to the left, and the main peak of the blue light of the display module 2 moves to the left.
[0083] Therefore, by adjusting the current and / or duty cycle of at least one of the first light-emitting device 111 and the second light-emitting device 112 , the brightness and / or color temperature of the display module 2 can be adjusted.
[0084] It's important to note that color temperature is an important physical quantity used to describe the color characteristics of a light source. It essentially reflects how close the color of a light source's light is to the color of light emitted by a blackbody (an ideal radiator) when heated to a certain temperature. Measured in Kelvin (K), color temperature is positively correlated with the proportion of blue light in the spectrum: the higher the color temperature, the greater the relative proportion of blue light in the spectrum; the lower the color temperature, the greater the relative proportion of red light.
[0085] like Figure 5 As shown in the figure, when the main peak of the blue light from display module 2 moves to the left, the relative proportion of blue light in the spectrum increases, the color temperature increases, and the light appears cold. As shown in the figure, when the main peak of the blue light from display module 2 moves to the right, the relative proportion of blue light in the spectrum increases, the color temperature decreases, and the light appears warm.
[0086] Alternatively, as Figure 4 As shown, the control module 21 is used to reduce the current or duty cycle of the first light-emitting device 111 and increase the current or duty cycle of the second light-emitting device 112 in the first mode to increase the color temperature of the display module 2; or, the control module 21 is used to increase the current or duty cycle of the first light-emitting device 111 and reduce the current or duty cycle of the second light-emitting device 112 in the second mode to reduce the color temperature of the display module 2.
[0087] In some embodiments, as Figure 5 As shown, in the first mode, the current or duty cycle of the first light-emitting device 111 is reduced, and the current or duty cycle of the second light-emitting device 112 is increased to increase the color temperature of the display module 2. When the current or duty cycle of the first light-emitting device 111 is reduced and the current or duty cycle of the second light-emitting device 112 is increased, the proportion of long-wave blue light in the colored light decreases, while the proportion of short-wave blue light increases. The main peak of the blue light of the display module 2 moves to the left, and the color temperature increases, transitioning from warm light to cool light.
[0088] In some embodiments, as Figure 6As shown, in the second mode, the current or duty cycle of the first light-emitting device 111 is increased, and the current or duty cycle of the second light-emitting device 112 is decreased to reduce the color temperature of the display module 2. When the current or duty cycle of the first light-emitting device 111 is increased and the current or duty cycle of the second light-emitting device 112 is decreased, the proportion of long-wave blue light in the colored light increases, while the proportion of short-wave blue light decreases. The main peak of the blue light of the display module 2 moves to the right, and the color temperature decreases, switching from cold light to warm light.
[0089] Optionally, the first mode is a constant brightness diurnal rhythm mode, and the second mode is a constant brightness nocturnal rhythm mode.
[0090] Constant Brightness Daytime Rhythm Mode maintains constant brightness while the color temperature shifts from warm to cool. Constant Brightness Nighttime Rhythm Mode maintains constant brightness while the color temperature shifts from cool to warm. Both Constant Brightness Daytime Rhythm and Constant Brightness Nighttime Rhythm Modes simulate natural lighting at different times of the day, mimicking the shift in ambient light throughout the day and night, and minimizing disruption to the body's circadian rhythm.
[0091] Optionally, the control module 21 is configured to control the first light emitting device 111 and the second light emitting device 112 according to a first formula in the first mode and the second mode. The first formula is:
[0092] CCT=V(λ)·f(I2,I3,D2,D3),
[0093] Wherein, CCT is the color temperature, V(λ) is the measured spectrum, I2 is the current of the first light-emitting device 111, I3 is the current of the second light-emitting device 112, D2 is the duty cycle of the first light-emitting device 111, and D3 is the duty cycle of the second light-emitting device 112.
[0094] Optionally, the control module 21 is used to increase the current or duty cycle of the first light-emitting device 111 and increase the current or duty cycle of the second light-emitting device 112 in the third mode to increase the brightness of the display module 2; or, the control module 21 is used to reduce the current or duty cycle of the first light-emitting device 111 and reduce the current or duty cycle of the second light-emitting device 112 in the fourth mode to reduce the brightness of the display module 2.
[0095] In some embodiments, in the third mode, the current or duty cycle of the first light-emitting device 111 is increased, and the current or duty cycle of the second light-emitting device 112 is increased to increase the brightness of the display module 2 .
[0096] In some embodiments, in the fourth mode, the current or duty cycle of the first light-emitting device 111 is reduced, and the current or duty cycle of the second light-emitting device 112 is reduced to reduce the brightness of the display module 2 .
[0097] Optionally, the third mode is a constant color temperature daytime rhythm mode, and the fourth mode is a constant color temperature nighttime rhythm mode.
[0098] Constant Color Temperature Daytime Rhythm Mode maintains a constant color temperature, with brightness shifting from low to high. Constant Color Temperature Nighttime Rhythm Mode maintains a constant color temperature, with brightness shifting from high to low. Both Constant Color Temperature Daytime Rhythm Mode and Constant Color Temperature Nighttime Rhythm Mode simulate natural lighting at different times of the day throughout the 24-hour day, aligning with the changing ambient light conditions and minimizing disruption to the human circadian rhythm.
[0099] Optionally, the control module 21 is configured to control the first light emitting device 111 and the second light emitting device 112 according to a second formula in the third mode and the fourth mode. The second formula is:
[0100] L=Φ2·I2·D2+Φ3·I3·D3,
[0101] Wherein, L is brightness, Φ2 is the chip luminous efficiency coefficient of the first light-emitting device 111, Φ3 is the chip luminous efficiency coefficient of the second light-emitting device 112, I2 is the current of the first light-emitting device 111, I3 is the current of the second light-emitting device 112, D2 is the duty cycle of the first light-emitting device 111, and D3 is the duty cycle of the second light-emitting device 112.
[0102] Optionally, when the brightness of the display module 2 is less than a first threshold value, the control module 21 is used to reduce or increase the current of the first light-emitting device 111, and reduce or increase the current of the second light-emitting device 112, so as to adjust the color temperature and / or brightness of the display module 2; when the brightness of the display module 2 is greater than or equal to the first threshold value, the control module 21 is used to reduce or increase the duty cycle of the first light-emitting device 111, and reduce or increase the duty cycle of the second light-emitting device 112, so as to adjust the color temperature and / or brightness of the display module 2.
[0103] In some embodiments, the first threshold may be a fixed value, such as 120 nits.
[0104] In some other embodiments, the first threshold may be 60% of the maximum brightness of the display module 2. That is, when the maximum brightness of the display module 2 is 300 nits, the first threshold may be 180 nits.
[0105] When the brightness of the display module 2 is less than the first threshold, the color temperature and / or brightness of the display panel 3 are adjusted by adjusting the current of the first light-emitting device 111 and / or the current of the second light-emitting device 112. This configuration avoids the problem of low-frequency flicker caused by a small duty cycle when the brightness of the display module 2 is less than the first threshold.
[0106] When the brightness of the display module 2 is greater than or equal to the first threshold, the color temperature and / or brightness of the display panel 3 are adjusted by adjusting the duty cycle of the first light-emitting device 111 and / or the duty cycle of the second light-emitting device 112. Through the above arrangement, when the brightness of the display module 2 is greater than or equal to the first threshold, the duty cycle adjustment is adopted, which can avoid the heating problem caused by increasing the current for adjustment. That is, the duty cycle adjustment can reduce the heating of the lamp beads 11.
[0107] In some embodiments, the first mode and the second mode can be gradual adjustments of color temperature without causing drastic changes in color temperature of the image. The third mode and the fourth mode can be gradual adjustments of brightness without causing drastic changes in brightness of the image.
[0108] The display module 2 of the present application can seamlessly and automatically adjust the brightness and / or color temperature according to the time of day and night, achieving rhythm-friendly display. The display module 2 of the present application mainly achieves rhythm-friendly display by adjusting the current and / or duty cycle of the lamp beads 11 of the backlight module 1, and the adjustment method is simple.
[0109] It should be noted that in some embodiments, the display module 2 can also be manually adjusted to adjust the color temperature and / or brightness of the display module 2. For example, the display module 2 can be configured with a high color gamut mode and an eye protection mode. The high color gamut mode corresponds to the current and duty cycle settings of the lamp beads 11 in one state; the eye protection mode corresponds to the current and duty cycle settings of the lamp beads 11 in another state.
[0110] In this embodiment, the display module 2 can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, or a navigator.
[0111] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify 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, "plurality" means two or more, unless otherwise specifically defined.
[0112] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0113] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.
[0114] The above description is merely a preferred embodiment of the present application and does not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.
Claims
1. A display module, characterized in that: include: A backlight module, the backlight module comprising a plurality of lamp beads, the lamp beads comprising a first light-emitting device and a second light-emitting device, the first light-emitting device and the second light-emitting device being adapted to emit light of the same color, the lamp beads further comprising a bracket and fluorescent glue, the first light-emitting device and the second light-emitting device being disposed in the same bracket, and the fluorescent glue covering the first light-emitting device and the second light-emitting device; The first light emitting device and the second light emitting device are suitable for emitting light independently, and the wavelength of the color light of the first light emitting device is greater than the wavelength of the color light of the second light emitting device.
2. The display module according to claim 1, wherein: The first light emitting device and the second light emitting device are configured to emit blue light.
3. The display module according to claim 1, wherein: The lamp bead includes a first pin and a second pin connected to the first light emitting device, and a third pin and a fourth pin connected to the second light emitting device.
4. The display module according to any one of claims 1 to 3, wherein: The display module further includes: a control module, electrically connected to the first light emitting device and the second light emitting device; The control module is used to independently control the first light emitting device and the second light emitting device, and the wavelength of the color light of the first light emitting device is greater than the wavelength of the color light of the second light emitting device.
5. The display module according to claim 4, wherein: The control module is configured to adjust a current and / or a duty cycle of at least one of the first light emitting device and the second light emitting device.
6. The display module according to claim 5, wherein: The control module is configured to reduce the current or duty cycle of the first light emitting device and increase the current or duty cycle of the second light emitting device in the first mode; or, The control module is configured to increase the current or duty cycle of the first light emitting device and decrease the current or duty cycle of the second light emitting device in the second mode.
7. The display module according to claim 6, wherein: The first mode is a constant brightness diurnal rhythm mode, and the second mode is a constant brightness nocturnal rhythm mode.
8. The display module according to claim 5, wherein: The control module is configured to increase the current or duty cycle of the first light emitting device and the current or duty cycle of the second light emitting device in the third mode to increase the brightness of the display module; or The control module is configured to reduce the current or duty cycle of the first light emitting device and reduce the current or duty cycle of the second light emitting device in the fourth mode, so as to reduce the brightness of the display module.
9. The display module according to claim 8, wherein: The third mode is a constant color temperature daytime rhythm mode, and the fourth mode is a constant color temperature nighttime rhythm mode.
10. The display module according to any one of claims 5 to 9, wherein: When the brightness of the display module is less than a first threshold, the control module is used to reduce or increase the current of the first light-emitting device, and reduce or increase the current of the second light-emitting device, so as to adjust the color temperature and / or brightness of the display module; When the brightness of the display module is greater than or equal to the first threshold, the control module is used to reduce or increase the duty cycle of the first light-emitting device, and reduce or increase the duty cycle of the second light-emitting device, so as to adjust the color temperature and / or brightness of the display module.