Display module and display device

Abstract

The present invention discloses a display module and a display device, wherein the display module includes a display area and a non-display area surrounding the display area, the display module includes a first display panel and a second display panel, the first display panel is located on a side close to the light-emitting surface of the display module; the first display panel includes a first light-transmitting area and a first frame, the second display panel includes a second light-transmitting area and a second frame, in a direction perpendicular to the light-emitting surface of the display module, the display area is an area where the first light-transmitting area and the second light-transmitting area overlap; a first driving unit is bound in the second frame of the second display panel, and a first heat-affected zone is located on a side of the first driving unit close to the display area along a first direction, the first heat-affected zone surrounds the first driving unit; in a direction perpendicular to the light-emitting surface of the display module, the first heat-affected zone is located in the non-display area. The present invention improves the uneven brightness caused when the driving chip is directly bound to the substrate, and improves the brightness uniformity of the display module in the black state.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more specifically, to a display module and a display device. Background Art

[0002] With the development of electronic technology, display panel manufacturing has also become more mature. Display panels provided by existing technologies include liquid crystal display panels, organic light emitting display panels, plasma display panels, and the like.

[0003] Liquid crystal display panels have the advantages of being thin, light, low power consumption and low radiation, and are widely used in various fields such as consumer electronics, automobiles, rail transit, aviation and defense. Liquid crystal display panels usually include a color filter substrate and an array substrate that are arranged relatively to each other, and a liquid crystal layer between the color filter substrate and the array substrate. A black matrix and a color resistance layer are provided on the side of the color filter substrate close to the array substrate. The electric field between the pixel electrode and the common electrode in the display panel can deflect the liquid crystal molecules. After the liquid crystal molecules are deflected, the light generated by the backlight assembly will pass through the display panel. By adjusting the size of the electric field, the liquid crystal molecules can be deflected to different degrees. When the liquid crystal molecules are deflected to different degrees, the transmittance of the display panel is different, and the amount of light transmitted through the liquid crystal display panel by the backlight assembly is different, thereby realizing the display of images. Of course, with the improvement of customer experience requirements, including the special needs of special applications, higher requirements are put forward for display quality. For example, dual-screen display modules have appeared to improve contrast.

[0004] The problem of Mura (various creases caused by uneven display brightness) in display quality is becoming more and more important. Among them, uneven display in black state, that is, low grayscale, is a manifestation of Mura, which is especially serious in dual-screen display modules. The problem of uneven display in black state has been paid attention to since the development of commercial and automotive display terminals, and then to the fields of civil aviation and defense displays. The requirement for display uniformity in black state is crucial for users. Because the vehicle display requires consistent black background brightness when displaying map information; similarly, the display screen in the aviation cockpit has more stringent requirements on the brightness of the black background, mainly because airborne displays work in a low grayscale state most of the time. If the display is uneven to display information such as aircraft attitude and speed, the pilot will not be able to make an accurate judgment.

[0005] Therefore, there is an urgent need to provide a display module and a display device that can improve the display uniformity of the display module in a black state. Summary of the invention

[0006] In view of this, the present invention provides a display module and a display device to improve the brightness uniformity of the display module in a black state.

[0007] In one aspect, the present invention provides a display module, comprising a display area and a non-display area surrounding the display area, the display module comprising a first display panel and a second display panel arranged opposite to each other, the first display panel being located on a side of the second display panel close to a light emitting surface of the display module;

[0008] The first display panel includes a first light-transmitting area and a first frame surrounding the first light-transmitting area, the second display panel includes a second light-transmitting area and a second frame surrounding the second light-transmitting area, and in a direction perpendicular to the light-emitting surface of the display module, the display area is an area where the first light-transmitting area and the second light-transmitting area overlap;

[0009] A first driving unit and a first heat-affected zone located on a side of the first driving unit close to the display area along a first direction are bounded in the second frame of the second display panel, and the first heat-affected zone surrounds the first driving unit; wherein the first direction is parallel to the plane where the second display panel is located;

[0010] In a direction perpendicular to the light emitting surface of the display module, the first heat-affected zone is located in the non-display area.

[0011] On the other hand, the present invention further provides a display device, comprising the above-mentioned display module, and further comprising a backlight module located on a side of the display module away from a light emitting surface of the display module.

[0012] Compared with the prior art, the display module and display device provided by the present invention achieve at least the following beneficial effects:

[0013] The display module of the present invention is a dual-screen display module, comprising a first display panel and a second display panel arranged opposite to each other, the first display panel is located on a side of the second display panel close to a light-emitting surface of the display module, the first display panel comprises a first light-transmitting area and a first frame surrounding the first light-transmitting area, the second display panel comprises a second light-transmitting area and a second frame surrounding the second light-transmitting area, in a direction perpendicular to the light-emitting surface of the display module, the display area is an area where the first light-transmitting area and the second light-transmitting area overlap, the display module comprises a display area and a non-display area surrounding the display area, a first driving unit is bound in the second frame of the second display panel, and a first driving unit is bound along the first light-transmitting area. In one direction, the first heat affected zone is located on the side of the first driving unit close to the display area, and the first heat affected zone surrounds the first driving unit. In the present invention, in the direction perpendicular to the light emitting surface of the display module, the first heat affected zone is located in the non-display area. Even if a temperature difference is generated when the first driving unit is bound, stress birefringence will be generated when the light passes through the first heat affected zone. The brightness of the first heat affected zone will be higher, but because the first heat affected zone is in the non-display area of ​​the display module, it will not appear in the display area of ​​the display module. In the black state, there will be no problem of uneven brightness in the display area, thereby improving the uniformity of the black state brightness of the display module.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0015] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0017] Figure 1 It is a schematic diagram of a planar structure of a display module provided by the related technology;

[0018] Figure 2 yes Figure 1 A cross-section in the A-A' direction;

[0019] Figure 3 It is a schematic diagram of the planar structure of a display module provided by the present invention;

[0020] Figure 4 yes Figure 3 The exploded view of the module is shown in the figure;

[0021] Figure 5 yes Figure 3 A cross-section in the B-B' direction;

[0022] Figure 6is a schematic diagram of a planar structure of another display module provided by the present invention;

[0023] Figure 7 yes Figure 6 The exploded diagram of the module is shown in the figure;

[0024] Figure 8 yes Figure 6 A cross-section in the C-C' direction;

[0025] Fig. 9 is a schematic diagram of a planar structure of another display module provided by the present invention;

[0026] Fig.10 yes Fig. 9 The exploded diagram of the module is shown in the figure;

[0027] Fig.11 yes Fig. 9 A cross-section in the D-D' direction;

[0028] Fig.12 yes Fig. 9 A cross-section in the E-E' direction;

[0029] Fig.13 is a schematic diagram of a planar structure of another display module provided by the present invention;

[0030] Fig.14 yes Fig.13 The exploded diagram of the module is shown in the figure;

[0031] Fig.15 yes Fig.13 A cross-section along the F-F' direction;

[0032] Fig.16 is a schematic diagram of a planar structure of another display module provided by the present invention;

[0033] Fig.17 yes Fig.16 The exploded diagram of the module is shown in the figure;

[0034] Fig.18 yes Fig.16 Another exploded schematic diagram of the display module;

[0035] Fig.19 It is a schematic diagram of a planar structure of a display device provided by the present invention;

[0036] Fig. 20 yes Fig.19 A cross-section diagram along the G-G' direction. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] In view of the problem of uneven display in black state, i.e. low grayscale, in the related art, which is more serious in the dual-screen display module, the inventors conducted the following research on the related art, referring to Figure 1 and Figure 2 , Figure 1 It is a schematic diagram of a planar structure of a display module provided by the related technology. Figure 2 yes Figure 1 A cross-section along the A-A' direction, Figure 1 The display module 000 includes a display area AA and a non-display area BB surrounding the display area AA. Figure 2The display module 000 includes a stacked first display screen 01 and a second display screen 02. The first display screen 01 is a color display screen, and the first display screen 01 also includes an array layer 011, a color film layer 012, a pixel electrode 013, a common electrode 014, and a liquid crystal molecule 015. The second display screen 02 is a black and white display screen, and the second display screen 02 also includes an array layer 021, a pixel electrode 022 and a common electrode 023, and a liquid crystal molecule 024. The first display screen 01 is located on the side of the second display screen 02 close to the light-emitting surface of the display module 000. The first substrate 03 of the first display screen 01 is bound with a first driving unit 04, and the second substrate 05 of the second display screen 02 is bound with a second driving unit 06. The process of binding the driving chip is a high-temperature process, so when binding the second driving unit 06, a second heat-affected zone 08 is generated. Corresponding to the second heat-affected zone 08, the upper and lower surfaces of the second substrate 05 also have a temperature difference. The thermal stress causes stress birefringence at the position of the second heat-affected zone 08, and the optical path difference changes. When displaying, the brightness at the position of the second heat-affected zone 08 is too high, resulting in COG (Chip On Glass) IC, the chip is directly bound to the LCD screen) Mura (various creases caused by uneven brightness of the display), affecting the uniformity of black-state brightness; similarly, a first heat-affected zone 07 is generated when the first driving unit 04 is bound. Corresponding to the first heat-affected zone 07, a temperature difference is generated on the upper and lower surfaces of the first substrate 03, and thermal stress causes stress birefringence at the position of the first heat-affected zone 07, and the optical path difference changes. When displaying, the brightness at the position of the first heat-affected zone 07 is too high, resulting in COG Mura, which affects the uniformity of black-state brightness; thus, the superposition of the double-layer panels will generate two COG Muras, and the uniformity of black-state brightness is even worse.

[0043] In view of this, the present invention provides a display module and a display device to improve the problem of poor uniformity of black state brightness. Specific embodiments of the display module and the display device will be described in detail below.

[0044] Reference Figure 3 , Figure 4 and Figure 5 , Figure 3 is a schematic diagram of a planar structure of a display module provided by the present invention, Figure 4 yes Figure 3 The exploded view of the module is shown in the figure. Figure 5 yes Figure 3 A cross-sectional view taken along the BB' direction. The display module 100 of this embodiment includes a display area AA and a non-display area BB surrounding the display area AA. The display module 100 includes a first display panel 10 and a second display panel 20 arranged opposite to each other. The first display panel 10 is located on a side of the second display panel 20 close to the light emitting surface K1 of the display module 100.

[0045] The first display panel 10 includes a first light-transmitting area 30 and a first frame 40 surrounding the first light-transmitting area 30, and the second display panel 20 includes a second light-transmitting area 50 and a second frame 60 surrounding the second light-transmitting area 50. In the direction Z perpendicular to the light-emitting surface K1 of the display module 100, the display area AA is the area where the first light-transmitting area 30 and the second light-transmitting area 50 overlap.

[0046] The second frame 60 of the second display panel 20 is bound with a first driving unit 70, and a first heat-affected zone 2001 located on a side of the first driving unit 70 close to the display area AA along the first direction X, and the first heat-affected zone 2001 surrounds the first driving unit 70; wherein the first direction X is parallel to the plane where the second display panel 20 is located;

[0047] In the direction Z perpendicular to the light emitting surface K1 of the display module 100 , the first heat affected zone 2001 is located in the non-display area BB.

[0048] Specifically, the display module 100 includes a display area AA and a non-display area BB surrounding the display area AA. Of course, the non-display area BB partially surrounds the display area AA, such as a water drop screen, which is not specifically limited here.

[0049] The display module 100 includes a first display panel 10 and a second display panel 20 that are arranged opposite to each other. The first display panel 10 is located on a side of the second display panel 20 close to a light emitting surface K1 of the display module 100. The display module 100 of the present invention is a dual-screen display module 100. Optionally, the first display panel 10 is a color display panel and the second display panel 20 is a black-and-white display panel. Adding the second display panel 20 can be used to improve the contrast of the display module 100. Optionally, in a bright state, the first display panel 10 and the second display panel 20 are simultaneously in a maximum transmittance state, and in a black state, the first display panel 10 and the second display panel 20 are simultaneously in a minimum transmittance state. Finally, the contrast of the display module 100 is the first display panel 10. The contrast ratio is the product of the contrast ratio of the first display panel 10 and the contrast ratio of the second display panel 20. For example, the white transmittance of the first display panel 10 is 6%, and the black transmittance is 0.006%, so the contrast ratio of the first display panel 10 = 6%: 0.006% = 1000:1, and the white transmittance of the second display panel 20 is 90%, and the black transmittance is 5%, so the contrast ratio of the second display panel 20 = 90%: 5% = 18:1. Then, the contrast ratio of the final display module 100 is the product of the contrast ratio of the first display panel 10 and the contrast ratio of the second display panel 20, which is equal to 18000:1. Compared with the case where only the first display panel 10 is provided, the contrast ratio is increased by 18 times. In this way, the contrast ratio of the display module 100 can be significantly improved by reducing the black transmittance.

[0050] It should be noted that a backlight module (not shown in the figure) is also required to be arranged on the side of the second display panel 20 away from the first display panel 10. The backlight module provides backlight, and the backlight light passes through the second display panel 20 and the first display panel 10 in sequence. In the present invention, in the direction Z perpendicular to the light-emitting surface K1 of the display module 100, the display area AA is the area where the first light-transmitting area 30 and the second light-transmitting area 50 overlap, and the area where the first frame 40 overlaps with the second light-transmitting area 50 in the direction Z perpendicular to the light-emitting surface K1 of the display module 100 is the non-display area BB, because the light will be blocked by the first frame 40 of the first display panel 10 after passing through the second light-transmitting area 50, so it is the non-display area BB; at the same time, in the direction Z perpendicular to the light-emitting surface K1 of the display module 100, the area where the second frame 60 overlaps with the first light-transmitting area 30 is also the non-display area BB, and the light will be blocked by the second frame 60 and cannot enter the first light-transmitting area 30, so it is the non-display area BB. Only the area where the first light-transmitting area 30 and the second light-transmitting area 50 overlap in the direction Z perpendicular to the light-emitting surface K1 of the display module 100 is the display area AA of the display module 100 , and light can pass through the second light-transmitting area 50 and the first light-transmitting area 30 in sequence.

[0051] Optional, see Figure 5 , Figure 5 FIG. 1 shows that the first display panel 10 includes a first base substrate 101 and a second base substrate 102. Figure 5In the figure, the first substrate 101 and the second substrate 102 are not pattern-filled. Optionally, the first substrate 101 and the second substrate 102 may be made of glass material, or PI (polyimide). The second substrate 102 includes a first array layer 106 on a side close to the first substrate 101, and the first array layer 106 includes a driving transistor (not shown in the figure). The first array layer 106 also includes a first electrode 103 on a side close to the first substrate 101. The first electrode 103 may be a pixel electrode. The first substrate 101 includes a color filter layer 107 on a side close to the second substrate 102. Of course, the color filter layer 107 may include a plurality of black matrices (not shown in the figure), and the black matrices are Color resistance (not shown in the figure), after the light passes through the color filter layer 107, it emits colored light. The color filter layer 107 also includes a second electrode 104 on the side away from the first base substrate 101. The second electrode 104 can be a common electrode. The first liquid crystal molecule 105 is sandwiched between the second electrode 104 and the first electrode 103. The second base substrate 102 is bound with a first driving unit 70. The first driving unit 70 provides a driving signal for the driving transistor in the first array layer 106 and provides a common voltage signal for the second electrode 104. The electric field between the first electrode 103 and the second electrode 104 can deflect the first liquid crystal molecule 105. When the degree of deflection of the first liquid crystal molecule 105 is different, the light transmittance of the first display panel 10 is different. The second display panel 20 includes a third base substrate 201 and a fourth base substrate 202. The third base substrate 201 and the fourth base substrate 202 can be glass substrates or PI. Figure 5 The third substrate 201 and the fourth substrate 202 are not pattern-filled. The side of the fourth substrate 202 close to the third substrate 201 includes a second array layer 206, and the second array layer 206 also includes a driving transistor (not shown in the figure). The side of the second array layer 206 close to the third substrate 201 includes a third electrode 203, and the third electrode 203 can be a pixel electrode. The side of the third substrate 201 close to the fourth substrate 202 includes a fourth electrode 204, and the fourth electrode 204 can be a common electrode. The second liquid crystal molecules 205 are between the third electrode 203 and the fourth electrode 204. The fourth substrate 202 is bound with a second driving unit 80, and the second driving unit 80 provides a driving signal for the driving transistor in the second array layer 206 and provides a common voltage signal for the fourth electrode 204. The electric field between the third electrode 203 and the fourth electrode 204 can deflect the second liquid crystal molecules 205. When the degree of deflection of the second liquid crystal molecules 205 is different, the transmittance of the second display panel 20 is different.

[0052] Optionally, the number of the first drive units 70 may be 1, 2, 3 or more, and the number of the first drive units 70 may be determined according to the size of the second display panel 20 in the second direction Y. The larger the size of the second display panel 20 in the second direction Y, the more the number of the first drive units 70 may be, which is not specifically limited here. Similarly, the number of the second drive units 80 may be 1, 2, 3 or more, and the number of the second drive units 80 may be determined according to the size of the first display panel 10 in the first direction X. The larger the size of the first display panel 10 in the second direction Y, the more the number of the second drive units 80 may be, which is not specifically limited here. The second direction Y intersects with the first direction X.

[0053] Optionally, in this embodiment, in the direction Z perpendicular to the light emitting surface K1 of the display module 100 , the first driving unit 70 and the second driving unit 80 at least partially overlap. Of course, the first driving unit 70 and the second driving unit 80 may not overlap, which is not specifically limited here.

[0054] Optionally, in this embodiment, only the schematic width k1 of the second frame 60 in the first direction X is wider. Specifically, the width k1 of the second frame 60 in the first direction X is greater than the width k2 of the first frame 40 in the first direction X, so that the first heat-affected zone 2001 is finally located in the non-display area BB in the direction Z perpendicular to the light-emitting surface K1 of the display module 100. Figure 5 In the embodiment of the display module 100, the display area AA overlaps with the second light-transmitting area 50 of the second display panel 20, and the non-display area BB of the display module 100 overlaps with the second frame 60 of the second display panel 20. The area of ​​the display area AA of the display module 100 is smaller than the area of ​​the first light-transmitting area 30 of the first display panel 10, and the area of ​​the non-display area BB of the display module 100 is also larger than the area of ​​the first frame 40 of the first display panel 10. Because the area of ​​the second frame 60 is larger than the area of ​​the first frame 40, the second frame 60 partially overlaps with the first light-transmitting area 30 in a direction perpendicular to the light-emitting surface K1 of the display film layer. Of course, the width of the first frame 40 of the first display panel 10 in the first direction X can also be greater than the width of the second frame 60 in the first direction X. Then, in the direction Z perpendicular to the light-emitting surface K1 of the display module 100, the first frame 40 partially overlaps with the second light-transmitting area 50, and the light of the first heat-affected zone 2001 will be blocked by the first frame 40, ensuring that the first heat-affected zone 2001 is located in the non-display area BB in the direction Z perpendicular to the light-emitting surface K1 of the display module 100, which is not shown here.

[0055] Optionally, a light shielding layer 90 is coated on both the first frame 40 and the second frame 60. Figure 5A light shielding layer 90 is coated on the side of the first base substrate 101 close to the second base substrate 102, which can be manufactured in the same process as the black matrix (not shown in the figure) in the color filter layer 107, which can simplify the manufacturing process. Of course, a light shielding layer 90 (not shown in the figure) can also be provided on the side of the first base substrate 101 away from the second base substrate 102; Optionally, Figure 5 A light shielding layer 90 is coated on the side of the third base substrate 201 close to the fourth base substrate 202. Of course, a light shielding layer 90 can also be provided on the side of the third base substrate 201 away from the fourth base substrate 202 (not shown in the figure), which is not specifically limited here.

[0056] In the present invention, in the direction Z perpendicular to the light emitting surface K1 of the display module 100, the first heat-affected zone 2001 is located in the non-display area BB. When the first driving unit 70 is bound, the upper and lower surfaces of the fourth base substrate 202 will have a temperature difference due to the high-temperature process. The thermal stress causes the light of the backlight module (not shown in the figure) to generate stress birefringence when passing through the first heat-affected zone 2001, and the optical path difference changes. The brightness of the first heat-affected zone 2001 will be higher, and the brightness of the first heat-affected zone 2001 will be greater than the brightness of other areas, resulting in poor uniformity of black state brightness. In the present invention, the first heat-affected zone 2001 is in the non-display area BB of the display module 100. One embodiment is as follows. Figure 5 The light of the first heat affected zone 2001 is blocked by the shading layer 90 on one side of the third base substrate 201, so that the first heat affected zone 2001 is located in the non-display area BB of the display module 100. In this way, the first heat affected zone 2001 with higher brightness will not appear in the display area AA of the display module 100. When the display module is observed on the light emitting surface K1 side of the display module 100, because the first heat affected zone 2001 is blocked by the non-display area BB, the first heat affected zone 2001 with higher brightness will not be observed. Therefore, the display area AA will not have uneven brightness in the black state, thereby improving the brightness uniformity of the display module 100 in the black state.

[0057] In some optional embodiments, continue to refer to Figure 3 , Figure 4 and Figure 5 , along the second direction Y, the center of the first driving unit 70 coincides with the center of the first heat-affected zone 2001;

[0058] Along the second direction Y, the width of the first driving unit 70 is m1, the width of the first heat-affected zone 2001 is b, and m1≥b;

[0059] In the plane where the second display panel 20 is located, the second direction Y is perpendicular to the first direction X, and the second direction Y is parallel to the plane where the second display panel 20 is located.

[0060] The second direction Y in the present invention refers to a direction perpendicular to the first direction X in the plane where the second display panel 20 is located. It can also be understood that the second direction Y refers to the arrangement direction of the output pads in the first driving unit 70 .

[0061] Specifically, along the second direction Y, the center of the first driving unit 70 coincides with the center of the first heat affected zone 2001 , which means that along the second direction Y, the center line of the first heat affected zone 2001 coincides with the center line of the first driving unit 70 . Along the second direction Y, the width of the first driving unit 70 is m1, and the width of the first heat affected zone 2001 is b. The first heat affected zone 2001 here is the temperature difference of the fourth base substrate 202 caused by the high temperature process when binding the first driving unit 70. The thermal stress causes stress birefringence in the first heat affected zone 2001, and the optical path difference changes. The first driving unit 70 has a plurality of output pads, and the fourth base substrate 202 has a plurality of input pads. The output pads are bound to the input pads one by one, then the space occupied by the output pads in the second direction Y will be equal to or less than the width of the first driving unit 70 in the second direction Y. Correspondingly, the space of the output pads in the second direction Y determines the width of the first heat affected zone 2001 in the second direction Y. Therefore, the width m1 of the first driving unit 70 is greater than or equal to the width b of the first heat affected zone 2001.

[0062] Since the first heat affected zone 2001 is located in the non-display area BB, the first heat affected zone 2001 with higher brightness will not appear in the display area AA of the display module 100, and the display area AA will not have uneven brightness in the black state, thereby improving the black state brightness uniformity of the display module 100.

[0063] In some optional embodiments, continue to refer to Figures 3 to 5 , along the first direction X, the width of the first heat affected zone 2001 is a, 0<a≤15mm; along the second direction Y, the width of the first heat affected zone 2001 is b, 0<b≤50mm.

[0064] Specifically, the width of the first heat affected zone 2001 in the first direction X and the second direction Y is determined by the high temperature process of binding the first driving unit 70. The larger the width of the first heat affected zone 2001 in the first direction X, or the larger the width of the first heat affected zone 2001 in the second direction Y, the larger the range of COG Mura generated by the second display panel 20. Therefore, the width of the first heat affected zone 2001 in the first direction X and the second direction Y should be reduced as much as possible, so as to reduce the area of ​​COG Mura generated by the second display panel 20.

[0065] In this embodiment, along the first direction X, the width of the first heat affected zone 2001 is a, 0<a≤15mm; along the second direction Y, the width of the first heat affected zone 2001 is b, 0<b≤50mm. Under the premise that the high temperature process allows, the area of ​​the second display panel 20 that produces COG Mura, that is, the area of ​​the first heat affected zone 2001 is relatively small.

[0066] In some optional embodiments, continue to refer to Figures 3 to 5 , along the first direction X, the distance from the first driving unit 70 to the first heat affected zone 2001 is c, 2.5 mm≤c≤4.5 mm.

[0067] It is understandable that when binding the first drive unit 70, the first heat-affected zone 2001 will be generated due to the high-temperature process. The generated first heat-affected zone 2001 will have a distance c with the first drive unit 70. The smaller the distance c, the better. Since the first heat-affected zone 2001 is located in the non-display area BB, if the distance c from the first drive unit 70 to the first heat-affected zone 2001 is reduced, the width of the non-display area BB in the first direction X can be minimized, that is, a narrow frame can be achieved. Optionally, the method of reducing the distance c from the first drive unit 70 to the first heat-affected zone 2001 can be, for example, to appropriately reduce the binding temperature without affecting the binding effect. Of course, other methods can also be used, which are not specifically limited here. In this embodiment, 2.5mm≤c≤4.5mm can minimize the width of the non-display area BB in the first direction X to achieve a narrow frame.

[0068] In some optional embodiments, referring to Figure 6 , Figure 7 and Figure 8 , Figure 6 is a schematic diagram of a planar structure of another display module provided by the present invention. Figure 7 yes Figure 6 The exploded diagram of the module is shown in the figure. Figure 8 yes Figure 6 A cross-sectional view along the C-C' direction.

[0069] A second driving unit 80 is bound to the first frame 40 of the first display panel 10, and a second heat-affected zone 1001 is located on the side of the first driving unit 70 close to the display area AA along the first direction X; the second light-transmitting area 50 includes a first area 5001 and a second area 5002, the first area 5001 is located on the side of the second area 5002 close to the second driving unit 80, and the brightness of the sub-pixel in the first area 5001 is less than the brightness of the sub-pixel in the second area 5002; the orthographic projection of the second thermal response area on the plane where the second display panel 20 is located is the first projection, the orthographic projection of the first area 5001 on the plane where the second display panel 20 is located is the second projection, and the area of ​​the first projection is smaller than the area of ​​the second projection.

[0070] In this embodiment, the first driving unit 70 and the second driving unit 80 do not overlap in the direction Z perpendicular to the light emitting surface K1 of the display module 100. In the first direction X, the second driving unit 80 is located on a side of the first driving unit 70 close to the display area AA.

[0071] A second driving unit 80 is bound to the first frame 40 of the first display panel 10 . Optionally, the second driving unit 80 is bound to a side of the second base substrate 102 close to the light emitting surface K1 of the display module 100 .

[0072] Figures 6 to 8 The figure only schematically shows a case where there is one first driving unit 70 and one second driving unit 80. The number of the first driving unit 70 and the second driving unit 80 may be greater than one, which is not specifically limited here. The film structure of the first display panel 10 and the second display panel 20 will not be described in detail here. Figures 6 to 8 Only the situation where the first driving unit 70 and the second driving unit 80 do not overlap in the direction Z perpendicular to the light emitting surface K1 of the display module is shown. Of course, the first driving unit 70 and the second driving unit 80 may also partially overlap in the direction Z perpendicular to the light emitting surface K1 of the display module, which is not shown in the figure.

[0073] Optional, see Figures 6 to 8 , the second heat-affected zone 1001 generated by the high-temperature process when binding the second driving unit 80 is at least partially located in the display area AA. In this embodiment, although the first heat-affected zone 2001 is located in the non-display area BB, the second heat-affected zone 1001 is located in the display area AA, so the brightness of the position corresponding to the second heat-affected zone 1001 will be high, resulting in the problem of uneven brightness of the display module 100 in the black state. It should be noted that after the light passes through the second display panel 20, the light transmittance decreases, so the light flux will decrease when the light reaches the first display panel 10. Of course, the brightness will also decrease after the light passes through the second heat-affected zone 1001.

[0074] In this embodiment, the second light-transmitting area 50 includes a first area 5001 and a second area 5002. The first area 5001 is located on a side of the second area 5002 close to the second driving unit 80. The brightness of the sub-pixel in the first area 5001 is less than the brightness of the sub-pixel in the second area 5002. In this embodiment, the second area 5002 and the first area 5001 are only a part of the second light-transmitting area 50. Of course, the sum of the areas of the second area 5002 and the first area 5001 can also be equal to the area of ​​the second light-transmitting area 50, that is, the part of the second light-transmitting area 50 except the first area 5001 is the second area 5002, which is not shown in the drawings. The first area 5001 is a portion close to the second driving unit 80. Reducing the brightness of the sub-pixels in the first area 5001 can balance the brightness increase of the second heat-affected zone 1001 caused by the high-temperature process. For example, the brightness of the light emitted from the second display panel 20 after passing through the second heat-affected zone 1001 is A1, and the brightness of the light emitted from the second display panel 20 after passing through the area outside the second heat-affected zone 1001 is A2, A1>A2. At this time, if the brightness of the sub-pixels in the first area 5001 is reduced to B1, and the brightness of the sub-pixels in the second area 5002 is reduced to B2, B1<B2, then the brightness of the final display module 100, corresponding to the brightness of the first area 5001 is A1+B1, and the brightness of the second area 5002 is A2+B2, A1+B1 and A2+B2 are nearly equal, thereby improving the problem of uneven brightness of the display module 100 in the black state.

[0075] For the second display panel 20, its first heat-affected zone 2001 is located in the non-display area BB, so although the brightness of light will increase after passing through the first heat-affected zone 2001, it will be blocked by the shading layer 90 in the non-display area BB and will not appear in the display area AA. For the first display panel 10, the brightness of the sub-pixel in the first area 5001 is lower than the brightness of the sub-pixel in the second area 5002. By reducing the brightness of the sub-pixel in the first area 5001 and then superimposing the brightness increase caused by the birefringence of the second heat-affected zone 1001 in the first area 5001, the brightness of the display module 100 in the first area 5001 and the brightness of the display module 100 in the second area 5002 finally tend to be consistent.

[0076] The orthographic projection of the second thermal response area on the plane where the second display panel 20 is located is the first projection, and the orthographic projection of the first area 5001 on the plane where the second display panel 20 is located is the second projection, and the area of ​​the first projection is smaller than the area of ​​the second projection. It should be noted that if the area of ​​the first projection is larger than the area of ​​the second projection, then the area of ​​the first area 5001 corresponding to the reduction of the sub-pixel brightness is smaller than the area of ​​the second heat-affected zone 1001, that is, there will still be a part of the sub-pixels in the second heat-affected zone 1001 with high brightness, and the brightness of this part of the sub-pixels is greater than the brightness of other areas as a whole, and there is still the problem of poor brightness uniformity in the black state. In this embodiment, the area of ​​the first projection is smaller than the area of ​​the second projection, so that the area of ​​the first area 5001 that reduces the sub-pixel brightness is larger than the area of ​​the second heat-affected zone 1001, ensuring that the overall brightness of the display module 100 corresponding to the second heat-affected zone 1001 is consistent with the overall brightness of other areas.

[0077] In some optional embodiments, referring to Fig. 9 , Fig.10 , Fig.11 and Fig.12 , Fig. 9 is a schematic diagram of a planar structure of another display module provided by the present invention. Fig.10 yes Fig. 9 The exploded diagram of the module is shown in the figure. Fig.11 yes Fig. 9 A cross-section along the D-D' direction, Fig.12 yes Fig. 9 In a cross-sectional view taken along line EE', the second heat affected zone 1001 is located in the first light transmitting zone 30, the first heat affected zone 2001 is located in the second light transmitting zone 50, and in the direction Z perpendicular to the light emitting surface K1 of the display module 100, the second driving unit 80 and the first driving unit 70 do not overlap.

[0078] Specifically, Figures 9 to 12 The figure shows a case where there are two first drive units 70 and two second drive units 80. The first drive unit 70 and the second drive unit 80 can be determined according to the width of the display module 100 in the second direction Y in the actual product, and no specific limitation is made here. The film layer structure of the first display panel 10 and the second display panel 20 will not be described here. Figures 9 to 122 shows a situation where the first drive unit 70 and the second drive unit 80 do not overlap in the first direction X. Of course, the first drive unit 70 and the second drive unit 80 may also overlap in the first direction X, which is not shown in the figure. In this embodiment, in the direction Z perpendicular to the light-emitting surface K1 of the display module 100, the second drive unit 80 and the first drive unit 70 do not overlap. The first drive unit 70 contains a plurality of pads for transmitting signals, and the second drive unit 80 also contains a plurality of pads for transmitting signals. When working, the pads need to transmit electrical signals, so the second drive unit 80 and the first drive unit 70 will generate heat during operation. In the direction Z perpendicular to the light-emitting surface K1 of the display module 100, the second drive unit 80 and the first drive unit 70 do not overlap, so that the interference between the second drive unit 80 and the first drive unit 70 due to excessive temperature can be reduced.

[0079] Optional, see Figures 9 to 12 The display area AA of the display module 100 is equal to the area of ​​the first light-transmitting area 30 of the first display panel 10. The area of ​​the first frame 40 of the first display panel 10 is the area of ​​the non-display area BB of the display module 100. The first frame 40 of the first display panel 10 blocks the first driving unit 70 and the first heat-affected zone 2001 in the second display panel 20. Of course, the second heat-affected zone 1001 generated by the high-temperature process when binding the second driving unit 80 is at least partially located in the first light-transmitting area 30, that is, the second heat-affected zone 1001 is located in the display area AA of the display module 100. The first heat-affected zone 2001 is located in the second light-transmitting zone 50, that is, the width of the second frame 60 in the first direction X is smaller than the width of the first frame 40 in the first direction X. Although the first heat-affected zone 2001 is located in the second light-transmitting zone 50, it will be blocked by the first frame 40 of the first display panel 10. To be specific, corresponding to the first frame 40, a shading layer 90 is provided on the side of the first base substrate 101 close to the second base substrate 102, and the first heat-affected zone 2001 is still in the non-display area BB of the display module 100.

[0080] The first heat-affected zone 2001 is located in the non-display area BB, and the second heat-affected zone 1001 is located in the first light-transmitting area 30, that is, the second heat-affected zone 1001 is located in the display area AA, so the brightness of the position corresponding to the second heat-affected zone 1001 is high, resulting in uneven brightness of the display module 100 in the black state. It should be noted that after the light passes through the second display panel 20, the light transmittance decreases, so the light flux decreases when the light reaches the first display panel 10.

[0081] In this embodiment, the brightness of the sub-pixel in the first area 5001 is lower than the brightness of the sub-pixel in the second area 5002. Fig.10It is shown that the first zone 5001 is located in the second light-transmitting zone 50, close to the first heat-affected zone 2001. Of course, the first zone 5001 is close to the second driving unit 80. Here, by reducing the brightness of the sub-pixels in the first zone 5001, the brightness increase of the second heat-affected zone 1001 caused by the high-temperature process can be balanced, thereby improving the problem of uneven brightness of the display module 100 in the black state.

[0082] For the second display panel 20, its first heat-affected zone 2001 is located in the non-display area BB, so although the brightness of the light will increase after passing through the first heat-affected zone 2001, it will be blocked by the first frame 40 of the first display panel 10 and will not appear in the display area AA. For the first display panel 10, the brightness of the sub-pixel in the first area 5001 is less than the brightness of the sub-pixel in the second area 5002. By reducing the brightness of the sub-pixel in the first area 5001 and then superimposing the brightness increase caused by the birefringence of the second heat-affected zone 1001 in the first area 5001, the brightness of the display module 100 in the first area 5001 and the brightness of the display module 100 in the second area 5002 finally tend to be consistent.

[0083] The orthographic projection of the second thermal response area on the plane where the second display panel 20 is located is the first projection, and the orthographic projection of the first area 5001 on the plane where the second display panel 20 is located is the second projection. The area of ​​the first projection is smaller than the area of ​​the second projection. In this way, the first area 5001 which reduces the brightness of the sub-pixel is larger than the area of ​​the second heat-affected zone 1001, ensuring that the overall brightness of the display module 100 corresponding to the second heat-affected zone 1001 is consistent with the overall brightness of other areas.

[0084] It should be noted that, in the above-mentioned related art, reference Figure 1 and Figure 2 When the first heat affected zone 07 and the second heat affected zone 08 overlap, the double refraction will be superimposed to generate two COG Muras. The brightness after superposition is brighter, and the uniformity of black state brightness is worse. In this embodiment, in the direction Z perpendicular to the light emitting surface K1 of the display module 100, the second driving unit 80 and the first driving unit 70 do not overlap, so the first heat affected zone 2001 and the first heat affected zone 1001 generated will not overlap, and the light will not generate two COG Muras. Of course, since the first heat affected zone 1001 in the present invention is located in the non-display area BB, the display area AA in the black state will not have the problem of uneven brightness, thereby improving the uniformity of black state brightness of the display module 100.

[0085] In some optional embodiments, continue to refer to 9 to Fig.12 In a direction Z perpendicular to the light emitting surface K1 of the display module 100 , the second driving unit 80 and the first driving unit 70 are arranged alternately.

[0086] It is understandable that the first drive unit 70 and the second drive unit 80 generate heat when working. If the first drive unit 70 and the second drive unit 80 partially overlap or completely overlap in the direction Z perpendicular to the light emitting surface K1 of the display module 100, the generated heat will cause interference. In this embodiment, in the direction Z perpendicular to the light emitting surface K1 of the display module 100, the second drive unit 80 does not overlap with the first drive unit 70, which can reduce the interference between the second drive unit 80 and the first drive unit 70 due to excessive temperature.

[0087] Optionally, along the second direction Y, the spacing between the second drive unit 80 and the first drive unit 70 is equal, and is equal to L1. When binding the first drive unit 70 and binding the second drive unit 80, it is necessary to align the first drive unit 70 with the binding area on the fourth substrate 202, and align the second drive unit 80 with the binding area on the second substrate 102, so the alignment accuracy will affect the stability of signal transmission. During alignment, the high-definition camera on the machine needs to capture the position of the binding area where the first drive unit 70 and the second drive unit 80 are to be bound. The spacing between the second drive unit 80 and the first drive unit 70 is equal, so it is easier to capture the position of the binding area, thereby improving the binding efficiency.

[0088] In some optional embodiments, continue to refer to Figures 9 to 12 , the first frame 40 includes a first sub-frame 401, the second frame 60 includes a second sub-frame 601, and the first driving unit 70 is located in the second sub-frame 601; the orthographic projection of the first sub-frame 401 on the plane where the second display panel 20 is located is a first orthographic projection, and the orthographic projection of the second sub-frame 601 on the plane where the second display panel 20 is located is a second orthographic projection, and in the direction Z perpendicular to the light emitting surface K1 of the display module 100, the first orthographic projection overlaps with the second orthographic projection;

[0089] Along the first direction X, the width of the first sub-frame 401 is d1, and the width of the second sub-frame 601 is d2, d1≠d2, wherein the first direction X is parallel to the light emitting surface K1 of the display module 100.

[0090] Specifically, the first frame 40 includes a first sub-frame 401, the second driving unit 80 is located in the first sub-frame 401, and the width of the first sub-frame 401 along the first direction X is d1. The second frame 60 includes a second sub-frame 601, the first driving unit 70 is located in the second sub-frame 601, and the width of the second sub-frame 601 along the first direction X is d2. The orthographic projection of the first sub-frame 401 on the plane where the second display panel 20 is located is the first orthographic projection, and the orthographic projection of the second sub-frame 601 on the plane where the second display panel 20 is located is the first orthographic projection. The shadow is the second orthographic projection. In the direction Z perpendicular to the light-emitting surface K1 of the display module 100, the first orthographic projection overlaps with the second orthographic projection, that is, the first sub-frame 401 and the second sub-frame 601 are located on the same side, that is, if the first sub-frame 401 is the lower frame of the first frame 40, then the second sub-frame 601 is also the lower frame of the second frame 60. In the present invention, along the first direction X, the width d1 of the first sub-frame 401 is not equal to the width d2 of the second sub-frame 601, so that the first heat-affected zone 2001 is located in the non-display area BB. Of course, Fig.10 Only the case where d1 is greater than d2 is shown. Of course, d1 can also be less than d2, and no specific limitation is made here.

[0091] Since the first heat affected zone 2001 is located in the non-display area BB, the first heat affected zone 2001 with higher brightness will not appear in the display area AA of the display module 100, and the display area AA will not have uneven brightness in the black state, thereby improving the black state brightness uniformity of the display module 100.

[0092] Of course, the brightness of the sub-pixels in the first zone 5001 of the display module 100 of this embodiment is lower than the brightness of the sub-pixels in the second zone 5002. By reducing the brightness of the sub-pixels in the first zone 5001, the brightness increase of the second heat-affected zone 1001 caused by the high-temperature process can be balanced, thereby improving the problem of uneven brightness of the display module 100 in the black state.

[0093] In addition, in the present invention, the first driving unit 70 and the second driving unit 80 do not overlap in the direction perpendicular to the light emitting surface of the display module, and the binding position of the first driving unit 70 or the second driving unit 80 can be determined according to actual needs to achieve diversity of binding positions.

[0094] In some optional embodiments, continue to refer to Figures 9 to 12 , d1>d2, in the direction Z perpendicular to the light emitting surface K1 of the display module 100 , the first sub-frame 401 covers the first heat affected zone 2001 .

[0095] In the present embodiment, along the first direction X, the width d1 of the first sub-frame 401 is greater than the width d2 of the second sub-frame 601. In the direction Z perpendicular to the light emitting surface K1 of the display module 100, the first sub-frame 401 covers the first heat affected zone 2001. The first heat affected zone 2001 is blocked by the first sub-frame 401 of the first display panel 10. For the second display panel 20, although the brightness of light is increased after passing through the first heat affected zone 2001, it will be blocked by the first sub-frame 401 of the first display panel 10. The first heat affected zone 2001 is located in the non-display area BB and will not appear in the display area AA. For the first display panel 10, the brightness of the sub-pixels in the first zone 5001 is lower than the brightness of the sub-pixels in the second zone 5002. By reducing the brightness of the sub-pixels in the first zone 5001 and superimposing the brightness increase caused by the presence of birefringence in the second heat-affected zone 1001 in the first zone 5001, the brightness of the display module 100 in the first zone 5001 and the brightness of the display module 100 in the second zone 5002 eventually tend to be consistent.

[0096] In some optional embodiments, referring to Figures 6 to 8 , d1<d2, the first thermal response area is located in the second sub-frame 601.

[0097] Specifically, the first frame 40 includes a first sub-frame 401, the second driving unit 80 is located in the first sub-frame 401, and along the first direction X, the width of the first sub-frame 401 is d1, the second frame 60 includes a second sub-frame 601, the first driving unit 70 is located in the second sub-frame 601, and along the first direction X, the width of the second sub-frame 601 is d2, the orthographic projection of the first sub-frame 401 on the plane where the second display panel 20 is located is a first orthographic projection (not shown in the figure), and the orthographic projection of the second sub-frame 601 on the plane where the second display panel 20 is located is a second orthographic projection (not shown in the figure), and in the direction Z perpendicular to the light emitting surface K1 of the display module 100, the first orthographic projection overlaps with the second orthographic projection, that is, the first sub-frame 401 and the second sub-frame 601 are located On the same side, that is, if the first sub-frame 401 is the lower frame of the first frame 40, then the second sub-frame 601 is also the lower frame of the second frame 60. In this embodiment, along the first direction X, the width d1 of the first sub-frame 401 is smaller than the width d2 of the second sub-frame 601, that is, the second sub-frame 601 of the second display panel 20 is widened in the first direction X to cover the first heat affected zone 2001. The first heat affected zone 2001 is located in the non-display area BB of the display module 100. Since the first heat affected zone 2001 is located in the non-display area BB, the first heat affected zone 2001 with higher brightness will not appear in the display area AA of the display module 100, and the display area AA will not have uneven brightness in the black state, thereby improving the black state brightness uniformity of the display module 100.

[0098] Of course, although the first heat-affected zone 2001 is located in the non-display area BB, the second heat-affected zone 1001 is located in the display area AA, so the brightness of the position corresponding to the second heat-affected zone 1001 will be high, resulting in the problem of uneven brightness of the display module 100 in the black state. In this embodiment, the second light-transmitting area 50 includes a first area 5001 and a second area 5002, and the first area 5001 is located on the side of the second area 5002 close to the second driving unit 80. The brightness of the sub-pixel in the first area 5001 is less than the brightness of the sub-pixel in the second area 5002. Reducing the brightness of the sub-pixel in the first area 5001 can balance the brightness increase of the second heat-affected zone 1001 caused by the high-temperature process, thereby improving the problem of uneven brightness of the display module 100 in the black state.

[0099] In some optional embodiments, referring to Fig.13 , Fig.14 and Fig.15 , Fig.13 is a schematic diagram of a planar structure of another display module provided by the present invention. Fig.14 yes Fig.13 The exploded diagram of the module is shown in the figure. Fig.15 yes Fig.13 A cross-sectional view taken along the F-F' direction shows that the second driving unit 80 and the second heat affected zone 1001 partially surrounding the second driving unit 80 are bound to the first sub-frame 401, and in the direction Z perpendicular to the light emitting surface K1 of the display module 100, the second sub-frame 601 covers the second heat affected zone 1001.

[0100] Figures 13 to 15 In the first direction X, the first drive unit 70 and the second drive unit 80 do not overlap. Of course, the first drive unit 70 and the second drive unit 80 may also overlap along the first direction X. No specific limitation is made here. When the first drive unit 70 and the second drive unit 80 do not overlap in the first direction X, mutual interference due to high temperature generated in the working state can be avoided.

[0101] Figures 13 to 15 FIG. 1 only illustrates the situation where the first drive unit 70 and the second drive unit 80 do not overlap along the first direction X, and only illustrates the situation where there is one first drive unit 70 and one second drive unit 80 , which is not specifically limited here.

[0102] In this embodiment, the first sub-frame 401 of the first display panel 10 is bound to the second drive unit 80, and of course the first sub-frame 401 also includes a second heat-affected zone 1001 that partially surrounds the second drive unit 80. The second sub-frame 601 of the second display panel 20 is bound to the first drive unit 70 and the first heat-affected zone 2001 that partially surrounds the first drive unit 70. In the direction Z perpendicular to the light-emitting surface K1 of the display module 100, the second sub-frame 601 covers the second heat-affected zone 1001, and the second sub-frame 601 of the second frame 60 covers the first heat-affected zone 1001. The affected zone 2001 also blocks the second heat affected zone 1001. The second heat affected zone 1001 and the first heat affected zone 2001 are both located in the non-display area BB of the display module 100. Since the second heat affected zone 1001 and the first heat affected zone 2001 are both located in the non-display area BB, the first heat affected zone 2001 with higher brightness and the second heat affected zone 1001 with higher brightness will not appear in the display area AA of the display module 100. The display area AA will not have uneven brightness in the black state, further improving the black state brightness uniformity of the display module 100. Of course, due to the shielding effect of the second sub-frame 601, the light itself will not enter the second heat affected zone 1001, which can further improve the black state brightness uniformity of the display module 100.

[0103] In some optional embodiments, referring to Fig.16 and Fig.17 , Fig.16 is a schematic diagram of a planar structure of another display module provided by the present invention. Fig.17 yes Fig.16 An exploded diagram of the module is shown in Figure 2.

[0104] The first frame 40 includes a first sub-frame 401, the second frame 60 includes a second sub-frame 601, and the first driving unit 70 is located in the second sub-frame 601; the orthographic projection of the first sub-frame 401 on the plane where the second display panel 20 is located is a first orthographic projection, and the orthographic projection of the second sub-frame 601 on the plane where the second display panel 20 is located is a second orthographic projection, and in the plane where the second display panel 20 is located, the first orthographic projection and the second orthographic projection at least partially overlap; along the first direction X, the width of the first sub-frame 401 is d1, and along the second direction Y, the width of the second sub-frame 601 is d2, d1<d2; wherein the second direction Y is perpendicular to the first direction X, and the second direction Y is parallel to the light emitting surface K1 of the display module 100.

[0105] Specifically, the first frame 40 includes a first sub-frame 401, the second driving unit 80 is located in the first sub-frame 401, and along the first direction X, the width of the first sub-frame 401 is d1. The second frame 60 includes a second sub-frame 601, the first driving unit 70 is located in the second sub-frame 601, and along the second direction Y, the width of the second sub-frame 601 is d2. The orthographic projection of the first sub-frame 401 on the plane where the second display panel 20 is located is a first orthographic projection (not shown in the figure), and the orthographic projection of the second sub-frame 601 on the plane where the second display panel 20 is located is a second orthographic projection (not shown in the figure). In the direction Z perpendicular to the light emitting surface K1 of the display module 100, the first orthographic projection overlaps with the second orthographic projection. In this embodiment, the second sub-frame 601 of the second display panel 20 in the second direction Y is widened so that the first heat affected zone 2001 is located in the second sub-frame 601.

[0106] Fig.16 It is shown that the first driving unit 70 and the second driving unit 80 are located at different sides of the non-display area BB, which can also avoid mutual interference due to high temperature generated in the working state.

[0107] It should be noted that Fig.17 Only the case where the second heat-affected zone 1001 can also be at least partially located in the first light-transmitting zone 30 is shown. Of course, the second heat-affected zone 1001 can also be located in the first sub-frame 401, which is not specifically limited here. When the second heat-affected zone 1001 is at least partially located in the first light-transmitting zone 30, since the light will first pass through the second display panel 20, the transmittance will decrease, and the degree of birefringence of the light in the second heat-affected zone 1001 will be weakened due to the decrease in the transmittance of the light passing through the second display panel 20. When the second heat-affected zone 1001 is located in the first sub-frame 401, the second heat-affected zone 1001 is located in the non-display area BB of the display module 100, so that the display area AA will not have uneven brightness in the black state.

[0108] In this embodiment, the first heat affected zone 2001 is located in the second sub-frame 601, and the width of the second sub-frame 601 in the second direction Y is increased so that the first heat affected zone 2001 is located in the second sub-frame 601. Since the first heat affected zone 2001 is located in the non-display area BB, the first heat affected zone 2001 with higher brightness will not appear in the display area AA of the display module 100, and the display area AA will not have uneven brightness in the black state.

[0109] On the other hand, the first driving unit 70 and the second driving unit 80 are located on different sides of the non-display area BB, and there is enough space in the first direction X to set the first driving unit 70, so the spacing between the pads arranged in the first direction X in the first driving unit 70 can be increased, so that signal crosstalk between adjacent pads can be avoided. Similarly, there is enough space in the second direction Y to set the second driving unit 80, and the spacing between the pads arranged in the second direction Y in the second driving unit 80 can also be increased, so that signal crosstalk between adjacent pads can be avoided.

[0110] Furthermore, the first driving unit 70 and the second driving unit 80 are located on different sides of the non-display area BB. There is enough space in the first direction X to set up multiple first driving units 70 to meet the requirements of different types of display modules, and there is also enough space in the second direction Y to set up multiple second driving units 80 to meet the requirements of different types of display modules.

[0111] In some optional embodiments, referring to Fig.18 , Fig.18 yes Fig.16 Another decomposition diagram of the display module is shown in FIG. 4 , in which the first heat-affected zone 2001 is located at the first sub-frame 401 .

[0112] Reference Fig.18 , the width of the first sub-frame 401 in the second direction Y is also widened, and of course the width of the second sub-frame 601 in the second direction Y is also widened, so it can be further ensured that the second sub-frame 601 is located in the non-display area BB of the display module 100, and the first heat-affected zone 2001 is located in the second sub-frame 601 and the first sub-frame 401 in the direction perpendicular to the plane where the display module 100 is located. Since the first heat-affected zone 2001 is located in the non-display area BB of the display module 100, the first heat-affected zone 2001 with higher brightness will not appear in the display area AA of the display module 100, and the display area AA will not have uneven brightness in the black state.

[0113] In some optional embodiments, continue to refer to Figure 5 , Figure 8 , Fig.11 , Fig.12 and Fig.15 , the first frame 40 and the second frame 60 both include a light shielding layer 90 .

[0114] Figure 5 , Figure 8 , Fig.11 , Fig.12 and Fig.15Only the light-shielding layer 90 is shown in the first frame 40 and the second frame 60. The figure schematically shows that the light-shielding layer 90 is coated on the side of the first base substrate 101 close to the second base substrate 102. At this time, it can be manufactured by the same process as the black matrix (not shown in the figure) in the color film layer 107 of the first display panel 10, which can simplify the manufacturing process. Of course, the light-shielding layer 90 can also be set on the side of the first base substrate 101 away from the second base substrate 102 (not shown in the figure); the figure schematically shows that the light-shielding layer 90 is coated on the side of the third base substrate 201 close to the fourth base substrate 202. Of course, the light-shielding layer 90 can also be set on the side of the third base substrate 201 away from the fourth base substrate 202 (not shown in the figure), and no specific limitation is made here.

[0115] The shading layer 90 can prevent light leakage from the non-display area BB. On the other hand, the present invention can block the first heat-affected zone 2001 through the shading layer 90, and of course can also block the second heat-affected zone 1001, so that the first heat-affected zone 2001 is located in the non-display area BB, and the second heat-affected zone 1001 can also be located in the non-display area BB, so that the first heat-affected zone 2001 and the second heat-affected zone 1001 with higher brightness will not appear in the display area AA of the display module 100, and the display area AA will not have uneven brightness in the black state.

[0116] The present invention also provides a display device, referring to Fig.19 and Fig. 20 , Fig.19 is a schematic diagram of a planar structure of a display device provided by the present invention, Fig. 20 yes Fig.19 In a cross-sectional view taken along the G-G' direction, the display device 1000 includes a display module 100, and also includes a backlight module 200 located on a side of the display module 100 away from a light emitting surface K1 of the display module, and the backlight module 200 provides backlight for the display module 100. Fig.19 and Fig. 20 The embodiment of the present invention only takes the vehicle-mounted display device as an example to illustrate the display device. It can be understood that the display device provided in the embodiment of the present invention can be a mobile phone, a computer, a television, an electronic paper or other display device with a display function, and the present invention does not specifically limit this. The display device provided in the embodiment of the present invention has the beneficial effects of the display panel 100 provided in the embodiment of the present invention. For details, please refer to the specific description of the display panel 100 in the above embodiments, and this embodiment will not be repeated here.

[0117] It can be seen from the above embodiments that the display module and display device provided by the present invention achieve at least the following beneficial effects:

[0118] The display module of the present invention is a dual-screen display module, comprising a first display panel and a second display panel arranged opposite to each other, the first display panel is located on a side of the second display panel close to a light-emitting surface of the display module, the first display panel comprises a first light-transmitting area and a first frame surrounding the first light-transmitting area, the second display panel comprises a second light-transmitting area and a second frame surrounding the second light-transmitting area, in a direction perpendicular to the light-emitting surface of the display module, the display area is an area where the first light-transmitting area and the second light-transmitting area overlap, the display module comprises a display area and a non-display area surrounding the display area, a first driving unit is bound in the second frame of the second display panel, and a first driving unit is bound along the first light-transmitting area. In one direction, the first heat affected zone is located on the side of the first driving unit close to the display area, and the first heat affected zone surrounds the first driving unit. In the present invention, in the direction perpendicular to the light emitting surface of the display module, the first heat affected zone is located in the non-display area. Even if a temperature difference is generated when the first driving unit is bound, stress birefringence will be generated when the light passes through the first heat affected zone. The brightness of the first heat affected zone will be higher, but because the first heat affected zone is in the non-display area of ​​the display module, it will not appear in the display area of ​​the display module. In the black state, there will be no problem of uneven brightness in the display area, thereby improving the uniformity of the black state brightness of the display module.

[0119] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A display module, characterized in that: The display module includes a display area and a non-display area surrounding the display area, and the display module includes a first display panel and a second display panel arranged opposite to each other, wherein the first display panel is located on a side of the second display panel close to a light emitting surface of the display module; The first display panel includes a first light-transmitting area and a first frame surrounding the first light-transmitting area, the second display panel includes a second light-transmitting area and a second frame surrounding the second light-transmitting area, and in a direction perpendicular to the light-emitting surface of the display module, the display area is an area where the first light-transmitting area and the second light-transmitting area overlap; A first driving unit and a first heat-affected zone located on a side of the first driving unit close to the display area along a first direction are bounded in the second frame of the second display panel, and the first heat-affected zone surrounds the first driving unit; wherein the first direction is parallel to the plane where the second display panel is located; In a direction perpendicular to the light emitting surface of the display module, the first heat-affected zone is located in the non-display area; Along the second direction, the center of the first driving unit coincides with the center of the first heat-affected zone; Along the second direction, the width of the first driving unit is m1, the width of the first heat-affected zone is b, and m1≥b; Wherein, in the plane where the second display panel is located, the second direction is perpendicular to the first direction, and the second direction is parallel to the plane where the second display panel is located.

2. The display module according to claim 1, characterized in that: Along the first direction, the width of the first heat-affected zone is a, 0<a≤15mm, 0<b≤50mm.

3. The display module according to claim 1, characterized in that: Along the first direction, a distance from the first driving unit to the first heat-affected zone is c, and 2.5 mm≤c≤4.5 mm.

4. The display module according to claim 1, characterized in that: A second driving unit is bound in the first frame of the first display panel, and a second heat-affected zone is located on a side of the first driving unit close to the display area along the first direction; The second light-transmitting area includes a first area and a second area, the first area is located on a side of the second area close to the second driving unit, and the brightness of the sub-pixel in the first area is smaller than the brightness of the sub-pixel in the second area; The orthographic projection of the second thermal response area on the plane where the second display panel is located is a first projection, and the orthographic projection of the first area on the plane where the second display panel is located is a second projection, and an area of ​​the first projection is smaller than an area of ​​the second projection.

5. The display module according to claim 4, characterized in that: The second heat-affected zone is located in the first light-transmitting zone, the first heat-affected zone is located in the second light-transmitting zone, and in a direction perpendicular to the light-emitting surface of the display module, the second driving unit and the first driving unit do not overlap.

6. The display module according to claim 5, characterized in that: In a direction perpendicular to the light emitting surface of the display module, the second driving unit and the first driving unit are arranged alternately.

7. The display module according to claim 4, characterized in that: The first frame includes a first sub-frame, the second frame includes a second sub-frame, and the first driving unit is located in the second sub-frame; the orthographic projection of the first sub-frame on the plane where the second display panel is located is a first orthographic projection, and the orthographic projection of the second sub-frame on the plane where the second display panel is located is a second orthographic projection, and in a direction perpendicular to the light emitting surface of the display module, the first orthographic projection overlaps with the second orthographic projection; Along a first direction, a width of the first sub-frame is d1, a width of the second sub-frame is d2, d1≠d2, wherein the first direction is parallel to the light emitting surface of the display module.

8. The display module according to claim 7, characterized in that: d1>d2, in the direction perpendicular to the light emitting surface of the display module, the first sub-frame covers the first heat-affected zone.

9. The display module according to claim 7, characterized in that: d1<d2, the first thermal response area is located in the second sub-frame.

10. The display module according to claim 9, characterized in that: The first sub-frame is bound with a second driving unit and a second heat-affected zone partially surrounding the second driving unit, and the second sub-frame covers the second heat-affected zone in a direction perpendicular to the light-emitting surface of the display module.

11. The display module according to claim 1, characterized in that: The first frame includes a first sub-frame, the second frame includes a second sub-frame, and the first driving unit is located in the second sub-frame; The orthographic projection of the first sub-frame on the plane where the second display panel is located is a first orthographic projection, and the orthographic projection of the second sub-frame on the plane where the second display panel is located is a second orthographic projection. On the plane where the second display panel is located, the first orthographic projection and the second orthographic projection at least partially overlap; Along the first direction, the width of the first sub-frame is d1, and along the second direction, the width of the second sub-frame is d2, d1<d2; wherein, the second direction is perpendicular to the first direction and parallel to the light emitting surface of the display module.

12. The display module according to claim 11, characterized in that: The first heat-affected zone is located at the first sub-frame.

13. The display module according to claim 1, characterized in that: The first frame and the second frame both include a light shielding layer.

14. A display device, characterized in that: The display module comprises any one of claims 1 to 13, and further comprises a backlight module located on a side of the display module away from a light emitting surface of the display module.

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