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Light source device

By using a prism with a roughly V-shaped groove-shaped cross-section on the light guide plate, combined with a specific angle combination, the problem of insufficient field angle and brightness uniformity of the existing light guide plate is solved, and the field of view angle is expanded, the brightness is improved, and the adjustment is achieved. Improved optical properties reduce cost and assembly complexity.

Active Publication Date: 2015-07-15
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to ensure the viewing angle characteristics, suppress the brightness unevenness in the angular direction, and improve the dimming characteristics (area emission characteristics), the tip angle T of the prism is one type, so it cannot satisfy the viewing angle characteristics, brightness unevenness, The characteristics of the opposite light adjustment characteristics, but ultimately two expensive prism sheets must be used, which has the problem of increasing the number of components of the unit and cumbersome assembly.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0070] refer to figure 1 , Figure 2A ~ Figure 2E , Embodiment 1 of the present invention will be described.

[0071] In the light guide plate 13 of Embodiment 1, the figure 1 The angles between the first prism 31 and the second prism 32 are angle α: 42°, angle β: 62°, angle γ: 68°, angle Δ: 48°, and the light guide plate 13 is repeatedly configured with the first prism 31 and the second prism. second prism 32 .

[0072] Figure 2A ~ Figure 2E It is the optical simulation result of the light guide plate 13 in this case.

[0073] Figure 2A A luminance characteristic diagram is shown, the horizontal axis represents the length in the longitudinal direction of the light guide plate 13 , and the vertical axis represents the luminance. and Figure 2A The luminance distribution for making both LEDs 16 emit light is shown. The light adjustment characteristic was also measured by making the LED 16 on one side of the light guide plate 13 emit light.

[0074] Such as Figure...

Embodiment approach 2

[0080] refer to figure 1 , Figure 3A ~ Figure 3E Embodiment 2 of the present invention will be described.

[0081] In the light guide plate 13 of Embodiment 2, in figure 1 The angles between the first prism 31 and the second prism 32 are α: 52°, β: 52°, γ: 72°, Δ: 32 respectively, and the light guide plate 13 is repeatedly arranged with the first prism 31 and the second prism 32 . The light guide plate 13 is repeatedly configured with a first prism 31 and a second prism 32 .

[0082] Figure 3A ~ Figure 3E is the optical simulation result under the prism shape. The vertical and horizontal axes of the graph are Figure 2A ~ Figure 2E same.

[0083] Figure 3A is a luminance characteristic diagram, the horizontal axis represents the length in the longitudinal direction of the light guide plate 13, and the vertical axis represents the luminance. Brightness uniformity across the entire surface is good, and dimming performance is also good compared to conventional dimmin...

Embodiment approach 3

[0089] refer to figure 1 , Figure 4A ~ Figure 4E Embodiment 3 of the present invention will be described. In the light guide plate 13 of Embodiment 3, in figure 1 The angles between the first prism 31 and the second prism 32 are α: 52°, β: 52°, γ: 75°, Δ: 27°, and the light guide plate 13 is repeatedly arranged with the first prism 31 and the second prism 32 . The light guide plate 13 is repeatedly configured with a first prism 31 and a second prism 32 .

[0090] Figure 4A ~ Figure 4E is the optical simulation result in the prism shape in this case. The vertical and horizontal axes of the graph are Figure 2A ~ Figure 2E same.

[0091] Figure 4A is a luminance characteristic diagram, the horizontal axis represents the length in the longitudinal direction of the light guide plate 13, and the vertical axis represents the luminance. Brightness uniformity across the entire surface is good, and dimming performance is also good compared to conventional dimming characte...

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Abstract

A light source device including a light guide plate (13) and a light source. The light guide plate (13) has: an incident surface on which light emitted from the light source is incident; an emission surface that emits light incident from the incident surface; and a propagation / reflection surface that faces the emission surface and propagates and reflects the light incident from the incident surface, towards the emission surface. The propagation / reflection surface has substantially V-shaped grooves, and the substantially V-shaped grooves comprise at least two types of grooves.

Description

technical field [0001] The present invention relates to a light guide plate used in a liquid crystal panel and an edge-lit backlight for illumination. Background technique [0002] A liquid crystal display device is generally not a self-luminous device, and thus requires another light source such as a backlight. The backlight unit is mainly composed of a light source and a light guide plate (Light Guide Plate) that guides light emitted from the light source so as to emit light in a surface. [0003] In general, backlight units are classified into a direct type, an edge type, and the like according to the position of a light source. If the direct type is adopted, a plurality of light sources, such as cold cathode tubes and LEDs (Light Emitting Diode), are arranged directly under the liquid crystal panel, and the light incident from the light source is diffused through a plurality of optical sheets, and irradiated to the liquid crystal display device panel. If the side-ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00F21Y101/02
CPCG02B6/0061G02B6/0038G02B6/0051
Inventor 菊池荣成日下雄介藤田胜金山喜彦持田省郎伊藤正弥
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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