CN100479030C

CN100479030C - Display device

Info

Publication number: CN100479030C
Application number: CNB2005100035815A
Authority: CN
Inventors: 徐坚鏹
Original assignee: Qisda Corp
Priority date: 2005-12-28
Filing date: 2005-12-28
Publication date: 2009-04-15
Anticipated expiration: 2025-12-28
Also published as: CN1991968A

Abstract

The invention discloses a display device that comprises a casing, a screen, a photoconductive cell, a photoreceptor and a control circuit. The screen is set on front of the casing. The photoconductive cell is used to guide a beam, and the photoconductive cell includes a first surface, a second surface and a side surface. The first surface is used to receive light beam, and the first surface is on front of the casing; the second surface is used to lead out the beam, the second surface possesses a irregular structure to decrease the total reflection light flux; the side surface connects the edge of the first surface and the second surface, and the light flux that beam is refracted from the first surface to the second surface is bigger than the light flux that beam is refracted from the first surface to the side surface. The photoreceptor is mounted in the casing and faced to the second surface, it is used to receive the beam lead out from the second surface and output a signal. The control circuit is couple connected with the screen and the photoreceptor, and adjust the brightness of the screen according to signal.

Description

Display device

Technical field

The present invention relates to a kind of display device, particularly relate to a kind of its light-guide device and have the proportionate relationship restriction on the size and the display device on irregular structure surface.

Background technology

General display device such as LCD TV etc., the display brightness of screen-picture can be by user's manual adjustment, with the ambient brightness when watching.For example when watching program more dim indoor or evening, under the contrast impression of human eye, have the bright excessively sensation of screen, perhaps when well-lighted indoor or daytime, have the darker sensation of screen.Traditional control knob on display device or on the telepilot, the design of setting up OPTICAL SENSORS on the casing of display device is arranged also at present, the corresponding screen intensity of adjusting with automatic sensitive context brightness.

In addition, be considering on attractive in appearance, OPTICAL SENSORS is arranged in the casing usually, utilizes light pipe (light pipe) that extraneous light is directed to OPTICAL SENSORS in the casing again.General light pipe has a receiving end and an output terminal, and light pipe receives light from receiving end, and the total reflection effect by tube wall to output terminal, is penetrated the ray guidance that received to OPTICAL SENSORS from output terminal more then.

Yet, the light pipe of making for general transparent material, during light incident receiving end cross section, incident angle is subject in positive and negative approximately 30 to 42 degree, incident angle in the tube wall place can't reach the critical angle of total reflection and have the part light quantity to reflect light pipe behind the light pipe otherwise inject, and causes the light loss of output terminal and influences light guide effect.Thus, restriction is to some extent satisfied in the be provided with position of receiving end cross section on casing, and for example light pipe promptly must be arranged at the top of casing, to receive the general light that produces from the indoor light source of top.

Obviously from the above, the ornaments position of display device promptly receives limitation greatly.For example can't be too far away apart from the light source below, though but under perhaps frivolous day by day, as the to emphasize wall built-up market demand, display device can't be embedded in the wall to bring into play decoration result more for fear of covering the light pipe that is arranged at the casing top in LCD TV.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of display device.Light-guide device in the display device is by the design on the proportionate relationship on size restriction and irregular structure surface, makes still can reach required light guide effect with than wide-angle incident the time when light beam.Thus, can increase the elasticity that position be set of light-guide device on display device with simple structure, and reduce its manufacturing cost, make that the ornaments of display device are also more convenient.

According to purpose of the present invention, a kind of display device is proposed, comprise a casing, a screen, a light-guide device, an OPTICAL SENSORS and a control circuit.Screen is disposed at the front of casing.Light-guide device is in order to guiding a light beam, and light-guide device comprises a first surface, a second surface and a side.First surface is in order to receiving beam, and first surface is disposed at the front of casing; Second surface is in order to derive light beam and relative with first surface, and second surface has an irregular structure, in order to reduce light beam in the total reflection light flux of second surface; Side system connects the edge of first surface and second surface, and the light beam luminous flux that refracts to second surface via first surface refracts to the luminous flux of side via first surface greater than light beam.OPTICAL SENSORS is disposed in the casing and towards second surface, the light beam that OPTICAL SENSORS derives in order to the reception second surface, and export a signal according to this.Control circuit couples screen and OPTICAL SENSORS, and basis signal is adjusted the brightness of screen.

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.

Description of drawings

Fig. 1 is the display device of preferred embodiment of the present invention is adjusted screen intensity according to ambient brightness a synoptic diagram;

Fig. 2 A is the structure vertical view of the light-guide device of preferred embodiment of the present invention;

The structure cut-open view of the light-guide device that Fig. 2 B is looked for the profile line 2b-2b ' of Fig. 2 A; And

Fig. 3 is the synoptic diagram that the light-guide device of preferred embodiment of the present invention is derived light beam.

The main element symbol description

100: display device

110: casing

130: screen

150: light-guide device

151: first surface

152: second surface

152a: irregular structure

153: the side

170: OPTICAL SENSORS

190: control circuit

O: light source

I: light beam

S: signal

Embodiment

Please refer to Fig. 1, what it illustrated is the synoptic diagram of adjusting screen intensity according to the display device of preferred embodiment of the present invention according to ambient brightness.Display device 100 for example is a LCD TV or a plasma TV, comprises a casing 110, a screen 130, a light-guide device 150, an OPTICAL SENSORS 170 and a control circuit 190.Screen 130 is disposed at the front of casing 110.Light-guide device 150 for example is a transparent material, as polymethylmethacrylate (Poly Methyl Methacrylate, PMMA), MS resin, macromolecule carbonic acid fat (Poly Carbonate, PC) and polyethylene terephthalate (Polyethylene Terephthalate, PET) or the like.Light-guide device 150 is in order to a light beam I who receives and guiding light source O sends, and light-guide device 150 comprises a first surface 151, a second surface 152 and a side 153.

First surface 151 is in order to receiving beam I, and first surface 151 is disposed at the front of casing 110.Second surface 152 is in order to derivation light beam I and with respect to first surface 151, second surface 152 also has an irregular structure 152a, in order to reduce light beam I in the total reflection light flux of second surface 152; Irregular structure 152a for example is a texture structure (texture).Side 153 connects the edge of first surfaces 151 and second surface 152, and the light beam I luminous flux that refracts to second surface 152 via first surface 151 refracts to the luminous flux of side 153 via first surface 151 greater than light beam I.OPTICAL SENSORS 170 for example is a charge coupled cell (Charge Couple Device, CCD), a complementary matal-oxide semiconductor (Complementary Metal-Oxide Semiconductor, OPTICAL SENSORS that CMOS) or arbitrarily can light sensing brightness; OPTICAL SENSORS 170 is disposed in the casing 110 and towards second surface 152, in order to the light beam I of reception second surface 152 derivation, and exports a signal S according to this.Control circuit 190 couples screen 130 and OPTICAL SENSORS 150, and basis signal S adjusts the brightness of screen 130.

In addition, light-guide device 150 is essentially a cylinder, and first surface 151 and second surface 152 have identical shaped in fact, and first surface 151 is circle or polygon.In the present embodiment, first surface 151 is that example explains with the circle.As for light-guide device 150 as how the proportionate relationship restriction on the size reach light beam I refracts to second surface 152 via first surface 151 luminous flux refracts to the luminous flux of side 153 via first surface 151 greater than light beam I effect, with and how to guide light beam I to OPTICAL SENSORS 170, now as follows at this description of drawings, but technology of the present invention is not confined to this.

Please refer to Fig. 2 A～Fig. 2 B, Fig. 2 A illustrates is structure vertical view according to the light-guide device of preferred embodiment of the present invention, and Fig. 2 B illustrates is the structure cut-open view of the light-guide device looked of the profile line 2b-2b ' along Fig. 2 A.Wherein, Fig. 2 A omits the graphic and label of second surface 152, and profile line 2b-2b ' is by the center of circle of first surface 151.According to the present invention, greater than the N of a relative distance T of first surface 151 and second surface 152 doubly, wherein N is greater than 1 in fact for an inscribed circle diameter D of first surface 151.When first surface 151 was circular, shown in Fig. 2 A, inscribed circle diameter D was the diameter of first surface 151.In the present embodiment, N is preferably 1.72.

By the restriction for N, after light beam I injected light-guide device 150 via first surface 151, being compared to traditional light pipe was to increase the luminous flux that directly is incident upon second surface 152.That is, even light beam I is with bigger incident angle, as greater than 42 degree, after first surface 151 is injected light-guide device 150, being compared to traditional light pipe is to reduce the luminous flux that is incident upon side 153, and then reduces the light loss that reflects light-guide device 150 via side 153.In addition, after light beam I injects light-guide device 150 with bigger incident angle via first surface 151, may reach the critical angle of total reflection when being incident upon second surface 152 for the incident angle of second surface 152.At this moment, utilize the irregular structure 152a of second surface 152 again, change second surface 152 thin portion angle everywhere, the luminous flux that makes light beam I reflect second surface 152 increases, and reaches required light guide effect.

Please refer to Fig. 3, what it illustrated is the synoptic diagram of deriving light beam according to the light-guide device of preferred embodiment of the present invention.For example, light-guide device 150 uses general glass to make, and the diameter D of first surface 151 is 5.5 unit lengths, and the relative distance T of first surface 151 and second surface 152 is 3.17 unit lengths.At this moment, even light beam I injects light-guide device 150 with the incident angles of 89 degree via first surface 151, and when penetrating via second surface 152, more than 50% of luminous flux the when luminous flux of being derived still has light beam I to inject first surface 151.Thus, make OPTICAL SENSORS 170 receive enough brightness with correct output signal S, control circuit 190 is suitably adjusted the brightness of screen 130 again according to signal S.

Though the display device 100 of present embodiment is considered as example with LCD TV or plasma electrically and explains, the light-guide device 150 of present embodiment also can be applicable to carry out according to extraneous brightness the various display device of the back coupling control of internal circuit.In addition, the persond having ordinary knowledge in the technical field of the present invention also can understand, when light-guide device 150 adopts the material of various polygons such as regular polygon or different refractivity, can under the proportionate relationship of inscribed circle diameter D and relative distance T, adjust the overall dimensions of light-guide device 150 equally, reach required light guide effect.

The disclosed display device of the above embodiment of the present invention, its light-guide device by second surface irregular structure and the relative distance of inscribed circle diameter and first surface and second surface between the design of proportionate relationship, make OPTICAL SENSORS sense outside the enough brightness, and improve the light loss problem that traditional light pipe produces when light is injected with big incident angle.Thus, increase light-guide device is provided with the position on the casing of display device elasticity, make that greatly the ornaments position of display device is more convenient simultaneously.Moreover light-guide device also can optionally be adjusted overall dimensions, for example shortens the relative distance of first surface and second surface, and with in response to the frivolous day by day market demand of display device, simple structure is outer also to reduce manufacturing cost simultaneously.

In sum; though disclosed the present invention in conjunction with an above preferred embodiment; yet it is not in order to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; can be used for a variety of modifications and variations, so protection scope of the present invention should be with being as the criterion that claim was defined.

Claims

1. display device comprises:

Casing;

Screen is disposed at the front of this casing;

Light-guide device, in order to the guiding light beam, this light-guide device comprises:

First surface, in order to receive this light beam, this first surface is disposed at the front of this casing;

Second surface, in order to derive this light beam and relative with this first surface, this second surface has an irregular structure, in order to reduce the total reflection light flux of this light beam in this second surface; And

The side connects the edge of this first surface and this second surface, and this light beam luminous flux of refracting to this second surface via this first surface refracts to the luminous flux of this side via this first surface greater than this light beam;

OPTICAL SENSORS is disposed in this casing and towards this second surface, and this OPTICAL SENSORS is in order to receiving this light beam that this second surface is derived, and exports a signal according to this; And

Control circuit couples this screen and this OPTICAL SENSORS, and adjusts the brightness of this screen according to this signal.

2. display device as claimed in claim 1, wherein this light-guide device is a cylinder, this first surface and this second surface have identical shaped in fact, and this first surface is circle or polygon.

3. display device as claimed in claim 2, wherein greater than the N of a relative distance of this first surface and this second surface doubly, wherein N is greater than 1 in fact for an inscribed circle diameter of this first surface.

4. display device as claimed in claim 3, wherein N is 1.72.

5. display device as claimed in claim 1, wherein this irregular structure is a texture structure (texture structure).

6. display device as claimed in claim 1, wherein the material of this light-guide device is a transparent material.

7. display device as claimed in claim 1, wherein this OPTICAL SENSORS be a charge coupled cell (Charge Couple Device, CCD) or a complementary matal-oxide semiconductor (ComplementaryMetal-Oxide Semiconductor, CMOS).

8. display device as claimed in claim 1, wherein this display device is a LCD TV or a plasma TV.