Display module
A display module includes a cushion plate having a transmittance of 20% to 40% of light at a spectrum wavelength of 380 nm to 780 nm in an area thereof other than an area in which a through-hole is formed, such that a difference between transmittances in the area in which the through-hole is not formed and the area in which the through-hole is formed may be reduced as much as possible. Reducing the difference between the transmittances in the area in which the through-hole is not formed and the area in which the through-hole is formed as much as possible may allow reflected-light visibility in the area in which the through-hole is not formed and reflected-light visibility in the area in which the through-hole is formed to be realized in close to each other as much as possible, thereby minimizing low gray-level mura near the through-hole area.
1. A display module, comprising:
a display panel;
a back plate disposed on a rear surface of the display panel; and
a cushion plate disposed on a rear surface of the back plate, the cushion plate being a multi-layer stack and including at least one through-hole through an entirety of the multi-layer stack,
wherein an upper layer of the multi-layer stack of the cushion plate, facing the rear surface of the display panel, has a reflectance in a range of 20% to 40% to light at a spectral wavelength of 380 nm to 780 nm,
wherein the light incident through the front surface of the display panel that is reflected back, is mostly reflected from the interface between the back plate and the upper layer of the multi-layer stack of the cushion plate, and from the interface between the back plate and the at least one through-hole,
wherein the reflectance of the upper layer is similar to a reflectance of the at least one through-hole to reduce a difference in transmittance of light between an area of the cushion plate proximate the at least one through-hole, and the at least one through-hole, and
wherein the reflectance of the upper layer and the reflectance of the at least one through-hole are measured based on light emitted from the display panel in a front direction opposite to the rear surface of the display panel.
2. The display module of claim 1 , wherein the multi-layer stack of the cushion plate includes an adhesive layer, a cushion layer, and a heat-dissipation layer, and
wherein the adhesive layer is the upper layer having the reflectance in a range of 20% to 40% to light at a spectral wavelength of 380 nm to 780 nm.
3. The display module of claim 2 , wherein the adhesive layer has a gray color.
4. The display module of claim 2 , wherein the adhesive layer, the cushion layer, and the heat-dissipation layer are sequentially stacked on the rear surface of the display panel to overlap in the up-down direction.
5. The display module of claim 1 , wherein the cushion plate includes an adhesive layer, an adhesive supporting layer, a cushion layer, and a heat-dissipation layer, and
wherein the adhesive layer or the adhesive supporting layer, or a combination thereof, is the upper layer having the reflectance in the range of 20% to 40% to light at a spectral wavelength of 380 nm to 780 nm.
6. The display module of claim 5 , wherein the adhesive layer, the adhesive supporting layer, the cushion layer, and the heat-dissipation layer are sequentially stacked on the rear surface of the display panel to overlap in the up-down direction.
7. The display module of claim 5 , wherein at least one of the adhesive layer and the adhesive supporting layer has a gray color.
8. The display module of claim 2 , wherein the adhesive layer is in contact with the back plate.
9. The display module of claim 5 , wherein the adhesive supporting layer is in contact with the adhesive layer, and wherein the adhesive layer is in contact with the back plate.
10. The display module of claim 2 , wherein the cushion plate further includes a flexible film between the heat-dissipation layer and the cushion layer, and wherein the flexible film has a black color.
11. The display module of claim 5 , wherein the cushion plate further includes a flexible film between the heat-dissipation layer and the cushion layer, and wherein the flexible film has a black color.
12. The display module of claim 1 , wherein a portion of the cushion plate corresponding to the at least one through-hole is removed.
13. The display module of claim 1 , further comprising:
a protective film attached to a rear surface of the cushion plate and disposed to cover the at least one through-hole.
14. The display module of claim 13 , further comprising:
a transparent film attached to a front surface of the protective film and disposed in the at least one through-hole.
15. The display module of claim 1 , further comprising:
a fingerprint sensor module or a camera module accommodated into the at least one through-hole.
16. A display module, comprising:
a display panel;
a back plate disposed on a rear surface of the display panel; and
a cushion plate disposed on a rear surface of the back plate, the cushion plate being a multi-layer stack and including at least one through-hole through an entirety of the multi-layer stack,
wherein an upper layer of the multi-layer stack of the cushion plate, facing the rear surface of the display panel, has a gray color, and a reflectance that is similar to a reflectance of the at least one through-hole to reduce a difference in transmittance of light between an area of the cushion plate proximate the at least one through-hole, and the at least one through-hole,
wherein the front portion of the display module including the cushion plate is perceived as having a gray color even when a layer below the upper layer of the multi-layer stack of the cushion plate has a black color,
wherein the light incident through the front surface of the display panel that is reflected back, is mostly reflected from the interface between the back plate and the upper layer of the multi-layer stack of the cushion plate, and from the interface between the back plate and the at least one through-hole, and
wherein the reflectance of the upper layer and the reflectance of the at least one through-hole are measured based on light emitted from the display panel in a front direction opposite to the rear surface of the display panel.
17. The display module of claim 16 , wherein the reflectance of the upper layer is in a range of 20% to 40% to light at a spectral wavelength of 380 nm to 780 nm.
18. The display module of claim 16 , wherein the multi-layer stack of the cushion plate includes an adhesive layer, a cushion layer, and a heat-dissipation layer stacked in sequential order, and
wherein the adhesive layer is the upper layer of the multi-layer stack.
19. The display module of claim 16 , wherein the multi-layer stack of the cushion plate includes an adhesive layer, an adhesive supporting layer, a cushion layer, and a heat-dissipation layer stacked in sequential order, and
wherein the adhesive layer or the adhesive layer is the upper layer of the multi-layer stack.