Liquid crystal display backlight's light reflection treatment portion that directs light from the light source toward the LCD excluding a transmission region of the LC
View Patent ↗A display device suitable for a game machine has dot printed films which are printed on a light guide plate which constitutes a backlight for illuminating a liquid crystal display panel. The dots of the dot printed films are arranged more densely in a window-frame portion corresponding region, which faces a display region of the liquid crystal display panel, and in the vicinity of an inner periphery of a transmission portion corresponding to a region which faces a transmission region.
1. A liquid crystal display device comprising:
a liquid crystal display panel which has a window-frame-like display region and a transmission region inside the window-frame-like display region; and
a backlight which is disposed behind the liquid crystal display panel and illuminates the liquid crystal display panel, wherein
the backlight includes a light guide plate which is arranged behind the liquid crystal display panel and a light source which is arranged close to at least one side periphery of the light guide plate,
the light guide plate includes a light reflection treatment portion which directs light from the light source in the direction toward the liquid crystal display panel in an image display corresponding region excluding a transmission corresponding region which faces the transmission region of the liquid crystal display panel on a surface thereof opposite to a side on which the liquid crystal display panel is arranged, and
the light reflectance of the light reflection treatment portion of the image display corresponding region which is arranged close to the transmission corresponding region of the light guide plate and the light reflectance of the reflection treatment portion of the image display corresponding region of regions of the light guide plate other than the transmission corresponding region are made different from each other.
2. A liquid crystal display device according to claim 1 , wherein the light reflectance of the light reflection treatment portion of the image display corresponding region which is arranged close to the transmission corresponding region of the light guide plate is larger than the light reflectance of the reflection treatment portion of the image display corresponding region of regions of the light guide plate other than the transmission corresponding region.
3. A liquid crystal display device according to claim 1 , wherein the light reflectance of the light reflection treatment portion of the image display corresponding region which is arranged close to the transmission corresponding region of the light guide plate is smaller than the light reflectance of the reflection treatment portion of the image display corresponding region of regions of the light guide plate other than the transmission corresponding region.
4. A liquid crystal display device according to claim 1 , wherein the light reflection treatment portion is formed of discontinuous printed films made of a light reflection material, and the number or the print density per a unit area of the discontinuous printed films in the image display corresponding region close to the transmission corresponding region of the light guide plate is larger than the number or the print density per a unit area of the discontinuous printed films in the image display corresponding region in regions other than the transmission corresponding region of the light guide plate.
5. A liquid crystal display device according to claim 1 , wherein the light reflection treatment portion which is applied to the image display corresponding region arranged close to the transmission corresponding region of the light guide plate is formed of mat printed films made of a light reflection material and the light reflection treatment portion which is applied to the image display corresponding region of regions of the light guide plate other than the transmission corresponding region is formed of dot printed films made of a light reflection material.
6. A liquid crystal display device according to claim 5 , wherein the light source is arranged on only one side edge of the light guide plate, and
a width of the mat printed film made of the light reflection material which is applied to the image display corresponding region arranged close to the transmission corresponding region at a side remote from the side edge on which the light source is mounted is larger than a width of the mat printed film made of the light reflection material which is applied to the image display corresponding region arranged close to the transmission corresponding region at a side close to the side edge on which the light source is mounted.
7. A liquid crystal display device according to claim 1 , wherein the light reflection treatment portion which is applied to the image display corresponding region arranged close to the transmission corresponding region of the light guide plate is formed of mat printed films made of a light reflection material and the light reflection treatment portion which is applied to the image display corresponding region of regions of the light guide plate other than the transmission corresponding region is formed of stripe printed films made of a light reflection material.
8. A liquid crystal display device according to claim 7 , wherein the light source is arranged on only one side edge of the light guide plate, and
a width of the mat printed film made of the light reflection material which is applied to the image display corresponding region arranged close to the transmission corresponding region at a side remote from the side edge on which the light source is mounted is larger than a width of the mat printed film made of the light reflection material which is applied to the image display corresponding region arranged close to the transmission corresponding region at a side close to the side edge on which the light source is mounted.
9. A liquid crystal display device according to claim 1 , wherein the light reflection portion is formed of a large number of crepes formed on the light guide plate, and the forming number or the forming density per a unit area of the crepes applied to the image display corresponding region arranged close to the transmission corresponding region of the light guide plate is set larger than the forming number or the forming density per a unit area of the crepes applied to the image display corresponding region at regions other than the transmission region.
10. A liquid crystal display device according to claim 1 , wherein an optical sheet is provided between the liquid crystal display panel and the backlight, and
the optical sheet includes an opening in a region thereof which faces the transmission region.
11. A liquid crystal display device according to claim 10 , wherein optical sheet is constituted of a stacked body formed of a light diffusion sheet and a prism sheet.
12. A liquid crystal display device comprising:
a liquid crystal display panel which has an image display region which displays images and a transmission region; and
a backlight which is disposed behind the liquid crystal display panel and illuminates the liquid crystal display panel, wherein
the backlight includes a light guide plate which is arranged behind the liquid crystal display panel and a light source which is arranged at least one side periphery of the light guide plate,
the light guide plate includes a light reflection treatment portion which directs light from the light source in the direction toward the liquid crystal display panel in an image display corresponding region which faces the image display region of the liquid crystal display panel on a surface thereof opposite to a side on which the liquid crystal display panel is arranged, and
the light reflectance of the light reflection treatment portion of the image display corresponding region which is arranged close to the transmission corresponding region of the light guide plate and the light reflectance of the light reflection treatment portion of the image display corresponding region of regions of the light guide plate other than the transmission corresponding region are made different from each other.
13. A liquid crystal display device according to claim 12 , wherein the light reflectance of the light reflection treatment portion of the image display corresponding region which is arranged close to the transmission corresponding region of the light guide plate is larger than the light reflectance of the reflection treatment portion of the image display corresponding region of regions of the light guide plate other than the transmission corresponding region.
14. A liquid crystal display device according to claim 12 , wherein the light reflectance of the light reflection treatment portion of the image display corresponding region which is arranged close to the transmission corresponding region of the light guide plate is smaller than the light reflectance of the light reflection treatment portion of the image display corresponding region of regions of the light guide plate other than the transmission corresponding region.
15. A liquid crystal display device according to claim 12 , wherein the light reflection treatment portion is formed of discontinuous printed films made of a light reflection material, and the number or the print density per a unit area of the discontinuous printed films in the image display corresponding region close to the transmission corresponding region of the light guide plate is larger than the number or the print density per a unit area of the discontinuous printed films in the image display corresponding region in regions other than the transmission corresponding region of the light guide plate.
16. A liquid crystal display device according to claim 12 , wherein the light reflection treatment portion which is applied to the image display corresponding region arranged close to the transmission corresponding region of the light guide plate is formed of mat printed films made of a light reflection material and the light reflection treatment portion which is applied to the image display corresponding region of regions of the light guide plate other than the transmission corresponding region is formed of dot printed films made of a light reflection material.
17. A liquid crystal display device according to claim 12 , wherein the light reflection treatment portion which is applied to the image display corresponding region arranged close to the transmission corresponding region of the light guide plate is formed of mat printed films made of a light reflection material and the light reflection treatment portion which is applied to the image display corresponding region of regions of the light guide plate other than the transmission corresponding region is formed of stripe printed films made of a light reflection material.
18. A liquid crystal display device according to claim 12 , wherein the light reflection portion is formed of a large number of crepes formed on the light guide plate, and the forming number or the forming density per a unit area of the crepes applied to the image display corresponding region arranged close to the transmission corresponding region of the light guide plate is set larger than the forming number or the forming density per a unit area of the crepes applied to the image display corresponding region at regions other than the transmission region.