Light guide plate, front light guide structure for reflective TFT screen, and sunlight screen
View Patent ↗A light guide plate, a front light guide structure for a reflective thin film transistor (TFT) screen, and a sunlight screen relate to the field of display technologies. The light guide plate includes a light guide substrate. Scattering netted dots are fixed on a side of the light guide substrate, and the scattering netted dots are provided on the light guide substrate by means of ultra-violet (UV) nanoimprint lithography. By providing the scattering netted dots on the light guide substrate by means of UV nanoimprint lithography, the reflectivity of the light guide substrate can be effectively reduced, and a better display effect can thus be obtained.
1. A front light guide structure for a reflective thin film transistor (TFT) screen, comprising:
a light guide plate, comprising a light guide substrate, wherein scattering netted dots are fixed on one side of the light guide substrate, and the scattering netted dots are provided on the light guide substrate by ultra-violet (UV) nanoimprint lithography;
a cover glass plate comprising a glass substrate and anti-reflective (AR) layers, wherein the AR layers are attached to two sides of the glass substrate respectively, the cover glass plate is provided at a first side of the light guide plate, wherein the first side of the light guide plate is adjacent to the scattering netted dots, and a gap exists between the cover glass plate and the light guide plate; and
an optical bonding layer attached to a second side of the light guide plate, wherein the second side of the light guide plate is away from the cover glass plate;
wherein a lamp bead is arranged on at least one side surface of an edge of the light guide plate, wherein the at least one side surface of the edge of the light guide plate is adjacent to the scattering netted dots; and the lamp bead is configured to irradiate the light guide plate; and
wherein luminance of a light source in the lamp bead meets the following formula:
L k =L e /A k /A k ,
wherein L represents the luminance, A represents light transmittance of the light source when the light source transmits through a color filter (CF) layer in the reflective TFT screen, L e represents expected reflection luminance, and K represents a light color constituting light of the lamp bead.
2. The front light guide structure according to claim 1 , wherein the light guide substrate is an ultra-white glass, polycarbonate (PC) or polymethyl methacrylate (PMMA) plate.
3. The front light guide structure for the reflective TFT screen according to claim 1 , further comprising a seal, wherein the seal is circumferentially arranged at an edge of the gap between the cover glass plate and the light guide plate in a sealing manner.
4. The front light guide structure for the reflective TFT screen according to claim 1 , wherein the seal is a double-sided foam adhesive.
5. The front light guide structure for the reflective TFT screen according to claim 1 , wherein the optical bonding layer is an optically clear adhesive (OCA) or optical clear resin (OCR).
6. The front light guide structure for the reflective TFT screen according to claim 1 , wherein each of the AR layers is deposited on a surface of the glass substrate by vacuum evaporation.
7. The front light guide structure for the reflective TFT screen according to claim 1 , wherein a wavelength of each of light colors constituting light of the lamp bead is a wavelength of a corresponding light color, wherein the corresponding light color has a maximum light transmittance when transmitting through a CF layer in the reflective TFT screen.
8. The front light guide structure for the reflective TFT screen according to claim 1 , wherein the lamp bead is a light source consisting of red, green and blue LEDs (RGB-LED) or a high-color-gamut LED.
9. A sunlight screen, comprising:
the front light guide structure for the reflective TFT screen according to claim 1 , and
the reflective TFT screen, wherein the reflective TFT screen is attached to a side of the optical bonding layer, wherein the side of the optical bonding layer is away from the light guide plate.
10. The front light guide structure for the reflective TFT screen according to claim 1 , wherein the light guide substrate is an ultra-white glass, PC or PMMA plate.
11. The front light guide structure for the reflective TFT screen according to claim 1 , wherein the lamp bead is an RGB-LED or a high-color-gamut LED.
12. The front light guide structure for the reflective TFT screen according to claim 7 , wherein the lamp bead is an RGB-LED or a high-color-gamut LED.
13. The sunlight screen according to claim 9 , further comprising a seal, wherein the seal is circumferentially arranged at an edge of the gap between the cover glass plate and the light guide plate in a sealing manner.
14. The sunlight screen according to claim 13 , wherein the seal is a double-sided foam adhesive.
15. The sunlight screen according to claim 9 , wherein the optical bonding layer is an optically clear adhesive (OCA) or optical clear resin (OCR).
16. The sunlight screen according to claim 9 , wherein each of the AR layers is deposited on a surface of the glass substrate by vacuum evaporation.
17. The sunlight screen according to claim 9 , wherein a lamp bead is arranged on at least one side surface of an edge of the light guide plate, wherein the at least one side surface of the edge of the light guide plate is adjacent to the scattering netted dots; and the lamp bead is configured to irradiate the light guide plate.