CN101399032A - Display apparatus with brightness and color temperature control system and brightness and colour temperature control method - Google Patents

Abstract

The invention relates to a display device, comprising a display module, a light source, a light source driving circuit, a display driving circuit and an optical sensor. The optical sensor is arranged at the periphery of the light source and is used for detecting the brightness and color temperature of the light source; the optical sensor is coupled with the display driving circuit and generates a feedback signal to the display driving circuit according to the brightness and color temperature of the light source; the display driving circuit receives an image signal to drive the display module to display images and updates the data of the image signal according to the feedback signal, thus achieving the purpose of regulating the brightness and color temperature of the images.

Description

Display device and brightness and color temperature control method that brightness and color temperature control system are arranged

Background technology

The present invention is relevant to a kind of display device, especially refers to a kind of display device with brightness and color temperature control system.

Background technology

Please refer to Fig. 1, Fig. 1 has the synoptic diagram of the display device 10 of brilliance control for prior art.Display device 10 comprises a display module 11, a light source 12, a light source driving circuit 14, a display driver circuit 16 and an optical sensor 18.Many group color temperature parameters can be set in the display device 10,, when light source 12 wears out, the color representation of display device 10 will be influenced as 6500K or 9300K.Optical sensor 18 is arranged at the periphery of light source 12, is used for the brightness of detection light source 12.Optical sensor 18 is coupled to light source driving circuit 14, and produces a feedback signal FB to light source driving circuit 14 according to the brightness of light source 12.Light source 12 is a light-emitting diode (LED) module, and light emitting diode can change luminous brightness by adjusting driving voltage or electric current, utilizes the light source of ruddiness, green glow and blue light diode to be mixed into white light.Optical sensor comprises a ruddiness sensing unit, a green glow sensing unit and a blue light sensing unit, can distinguish the brightness of ruddiness, green glow and the blue light of detection light source, so feedback signal FB comprises the parameter of the brightness that detects ruddiness, green glow and blue light.Therefore, light source driving circuit 14 can be adjusted driving voltage or electric current according to feedback signal FB, and the luminous intensity of removing to control separately ruddiness, green glow and blue light diode is with the colour temperature brightness of steady display device 10.

In sum, in order to make display device have stable colour temperature brightness, the display device of prior art is provided with optical sensor at the light source periphery, optical sensor immediately detection light source brightness and produce feedback signal, light source driving circuit can be adjusted the brightness of light source according to feedback signal.Light source commonly used comprises cold-cathode tube and light-emitting diode (LED) module, wherein the light source of light-emitting diode (LED) module utilizes the light source of ruddiness, green glow and blue light diode to be mixed into white light, so light source driving circuit can be controlled the luminous intensity of ruddiness, green glow and blue light diode separately, if display device uses cold-cathode tube as light source, then can only change luminous brightness by adjusting driving voltage or electric current, therefore above-mentioned display device with brilliance control is applicable to the display device of light-emitting diode (LED) module as light source.

Summary of the invention

A purpose of the present invention is to provide a kind of display device and a kind of brightness of display device and method of colour temperature controlled with brightness and color temperature control system, to solve the above problems.

Other purposes of the present invention and advantage can be further understood from technical characterictic disclosed in this invention.

For reaching above-mentioned one or part or whole purposes or other purposes, one embodiment of the invention provide a kind of display device with brightness and color temperature control system, comprise a display module; One light source is adjacent to this display module; One optical sensor is adjacent to this light source, is used for detecting this light source, to produce at least one feedback signal; And a display driver circuit, be coupled to this optical sensor, be used for receiving a picture signal and drive this display module and show an image, and adjust the data of this picture signal according to this feedback signal.

The present invention also provides a kind of brightness of display device and method of colour temperature controlled, and comprises the brightness and the colour temperature that detect a display device, to produce at least one feedback signal; And upgrade the data of a picture signal that drives this display device according to this feedback signal, to adjust the brightness and the colour temperature of the image that this display device shows.

Description of drawings

Fig. 1 has the synoptic diagram of the display device of brilliance control for prior art.

Fig. 2 has the synoptic diagram of first embodiment of the display device of brightness and colour temperature control for the present invention.

Fig. 3 has the synoptic diagram of second embodiment of the display device of brightness and colour temperature control for the present invention.

Fig. 4 handles the structural drawing of feedback signal for Fig. 2 display driver circuit.

Fig. 5 has the synoptic diagram of the 3rd embodiment of the display device of brightness and colour temperature control for the present invention.

Fig. 6 has the synoptic diagram of the 4th embodiment of the display device of brightness and colour temperature control for the present invention.

The main element symbol description

10 display device, 11 display modules

12 light sources, 14 light source drives

16 panel drivers, 18 optical sensors

20 display device 21 display modules of the present invention

22 light sources, 24 light source drives

26 panel drivers, 28 optical sensors

30 analog to digital converters, 261 red data passages

262 green data passages, 263 blue data passages

264 cardinar number devices, 281 red photosensitive units

282 green photosensitive unit 283 blue photosensitive units

Embodiment

About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of a following cooperation preferred embodiment with reference to the accompanying drawings, can clearly present.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are directions with reference to the accompanying drawings.Therefore, the direction term of use is to be used for illustrating not to be to be used for limiting the present invention.

Please refer to Fig. 2, Fig. 2 has the synoptic diagram of first embodiment of the display device 20 of brightness and colour temperature control for the present invention.Display device 20 comprises a display module 21, a light source 22, a light source driving circuit 24, a display driver circuit 26 and an optical sensor 28.Optical sensor 28 is arranged at the periphery of light source 22, is used for the brightness and the colour temperature of detection light source 22.Optical sensor 28 is coupled to display driver circuit 26, and produces a feedback signal FB to display driver circuit 26 according to the brightness and the colour temperature of light source 22.Display driver circuit 26 receives a picture signal 29 and drives display module 21 display images, so display driver circuit 26 can reach the brightness of adjustment image and the purpose of colour temperature according to the data of the received picture signal 29 of feedback signal FB renewal.In first embodiment, display driver circuit 26 is coupled to optical sensor 28, can receive the feedback signal FB that optical sensor 28 produces, and display driver circuit 26 calculates yield value according to feedback signal FB, with the data of update image signal 29.So, when too bright or too dark, by compensating image signals 29, display module 21 shown images still can reach required brightness and colour temperature at light source 22.Present embodiment can be applicable to have on the display device of light source, with the liquid crystal indicator is example, when the backlight module of liquid crystal indicator wears out, feed back signal to display driver circuit by the optical sensor generation that is arranged at the backlight module periphery, the data of update image signal 29 improve deficiency with compensate for backlight with the brightness of image.Similarly, the present invention also can be applicable to projector, when the light source ages of projector, feeds back signal to data processing circuit by the optical sensor generation that is arranged at the light source periphery, the data of update image signal 29 improve deficiency with compensatory light with the brightness of image.

Please refer to Fig. 3, Fig. 3 has the synoptic diagram of second embodiment of the display device 20 of brightness and colour temperature control for the present invention.Among second embodiment, optical sensor 28 is arranged on the display surface of display module 21, be used for detecting the brightness and the colour temperature of the image that display module 21 produced, optical sensor 28 is coupled to display driver circuit 26, therefore display driver circuit 26 can receive the feedback signal FB that optical sensor 28 produces, and calculate yield value according to feedback signal FB, with the data of update image signal 29.Present embodiment can be applicable to a liquid crystal indicator or a plasma display device, by the brightness of detection display device and the data of colour temperature adjustment picture signal 29.

Please refer to Fig. 4, Fig. 4 is the structural drawing that Fig. 2 display driver circuit 26 is handled feedback signal.Optical sensor 28 comprises a ruddiness sensing unit 281, a green glow sensing unit 282 and a blue light sensing unit 283, can distinguish the brightness of ruddiness, green glow and the blue light of detection light source.The feedback signal that optical sensor 28 produces is a simulating signal, by an analog to digital converter (ADC) 30 feedback signal is converted to digital signal.The parameter A, B, the C that comprise the brightness that detects ruddiness, green glow and blue light in the digital signal.Display driver circuit 26 comprises redness, green and blue three data passage 261-263, is used for receiving redness, green and the blue data of picture signal 29 respectively, to drive redness, green and the blue region of display module 21.Display driver circuit 26 has a cardinar number device 264, is used for parameter A, B, the C of digital signal converted to gain value alpha, β, the γ of brightness and colour temperature, with the data of update image signal 29.Record one transition matrix formula (9) in the cardinar number device 264, transition matrix is obtained by the following step 200 to step 240.

Step 200: suppose that default tristimulus values (tristimulus value) is X, Y, Z.

$\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]=\left[\begin{array}{ccc}D11& D12& D13\\ D21& D22& D23\\ D31& D32& D33\end{array}\right]\·\left[\begin{array}{c}\mathrm{\α}*A\\ \mathrm{\β}*B\\ \mathrm{\γ}*C\end{array}\right]+\left[\begin{array}{c}\mathrm{Offsetx}\\ \mathrm{Offsety}\\ \mathrm{Offsetz}\end{array}\right]$ Formula (1)

$\left[\begin{array}{c}\mathrm{\α}*A\\ \mathrm{\β}*B\\ \mathrm{\γ}*C\end{array}\right]=\left[\begin{array}{ccc}C11& C12& C13\\ C21& C22& C23\\ C31& C32& C33\end{array}\right]\·\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]+\left[\begin{array}{c}\mathrm{OffsetA}\\ \mathrm{OffsetB}\\ \mathrm{OffsetC}\end{array}\right]$ Formula (2)

Wherein D11-D33 and C11-C33 are conversion coefficient, and Offsetx-Offsetz and OffsetA-OffsetC are conversion constant.

Step 210: complete black, entirely in the picture red, green, full indigo plant entirely, suppose that gain value alpha, β, γ are all 1, then utilize the parameter value of colourity of optical sensor 28 measured light sources 22 as follows:

Complete black: A0, B0, C0

Red entirely: A1, B1, C1

Green entirely: A2, B2, C2

Complete blue: A3, B3, C3

In addition, utilize the tristimulus values of color surveying instrument measurement display module 21 as follows:

Complete black: X0, Y0, Z0

Red entirely: X1, Y1, Z1

Green entirely: X2, Y2, Z2

Complete blue: X3, Y3, Z3

Step 220: in complete black picture, X0, Y0, Z0 are all 0.

$\left[\begin{array}{c}\mathrm{\α}*A0\\ \mathrm{\β}*B0\\ \mathrm{\γ}*C0\end{array}\right]=\left[\begin{array}{ccc}C11& C12& C13\\ C21& C22& C23\\ C31& C32& C33\end{array}\right]\·\left[\begin{array}{c}0\\ 0\\ 0\end{array}\right]+\left[\begin{array}{c}\mathrm{OffsetA}\\ \mathrm{OffsetB}\\ \mathrm{OffsetC}\end{array}\right]$ Formula (3)

$\text{\⇒}\left[\begin{array}{c}\mathrm{OffsetA}\\ \mathrm{OffsetB}\\ \mathrm{OffsetC}\end{array}\right]=\left[\begin{array}{c}\mathrm{\α}*A0\\ \mathrm{\β}*B0\\ \mathrm{\γ}*C0\end{array}\right]$ Formula (4)

With formula (4) generation time formula (2)

$\left[\begin{array}{c}\mathrm{\α}*(A-A0)\\ \mathrm{\β}*(B-B0)\\ \mathrm{\γ}*(C-C0)\end{array}\right]=\left[\begin{array}{ccc}C11& C12& C13\\ C21& C22& C23\\ C31& C32& C33\end{array}\right]\·\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]$ Formula (5)

Step 230: by entirely red, parameter value substitution formula (5) green, complete blue picture can calculate conversion coefficient C11-C33 entirely.

$\left[\begin{array}{ccc}X1& Y1& Z1\\ X2& Y2& Z2\\ X3& Y3& Z3\end{array}\right]\·\left[\begin{array}{c}C11\\ C12\\ C13\end{array}\right]=\left[\begin{array}{c}A1-A0\\ A2-A0\\ A3-A0\end{array}\right]$ Formula (6)

$\left[\begin{array}{ccc}X1& Y1& Z1\\ X2& Y2& Z2\\ X3& Y3& Z3\end{array}\right]\·\left[\begin{array}{c}C21\\ C22\\ C23\end{array}\right]=\left[\begin{array}{c}B1-B0\\ B2-B0\\ B3-B0\end{array}\right]$ Formula (7)

$\left[\begin{array}{ccc}X1& Y1& Z1\\ X2& Y2& Z2\\ X3& Y3& Z3\end{array}\right]\·\left[\begin{array}{c}C31\\ C32\\ C33\end{array}\right]=\left[\begin{array}{c}C1-C0\\ C2-C0\\ C3-C0\end{array}\right]$ Formula (8)

Step 240: obtain being used for adjusting the brightness of image and the gain value alpha of colour temperature, the transition matrix of β, γ.

$\left[\begin{array}{c}\mathrm{\α}\\ \mathrm{\β}\\ \mathrm{\γ}\end{array}\right]=\left[\begin{array}{ccc}\frac{C11}{(A-A0)}& \frac{C12}{(A-A0)}& \frac{C13}{(A-A0)}\\ \frac{C21}{(B-B0)}& \frac{C22}{(B-B0)}& \frac{C23}{(B-B0)}\\ \frac{C31}{(C-C0)}& \frac{C32}{(C-C0)}& \frac{C33}{(C-C0)}\end{array}\right]\text{\·}\left[\begin{array}{c}X\\ Y\\ Z\end{array}\right]$ Formula (9)

Please refer to Fig. 5, Fig. 5 has the synoptic diagram of the 3rd embodiment of the display device 20 of brightness and colour temperature control for the present invention.Among the 3rd embodiment, optical sensor 28 is coupled to display driver circuit 26 and light source driving circuit 24, so the data of the feedback signal FB update image signal 29 that display driver circuit 26 can produce according to optical sensor 28 are with the brightness and the colour temperature of the image of adjusting display module 11.Similarly, light source driving circuit 24 also can be adjusted the luminosity of light source 22 according to the feedback signal FB that optical sensor 28 produces.No matter why type optical sensor 28 is coupled to light source that the advantage of display driver circuit 26 formed feedback arrangements is display device 20, can utilize display driver circuit 26 to compensate the brightness and the colour temperature of the image of display device 20, but the brightness problem of unstable of light source 22 itself in fact still exist, so optical sensor 28 is coupled to the brightness that light source driving circuit 26 formed feedback arrangements then can stabilized light source 22.Moreover, if light source 22 compensates separately for light-emitting diode (LED) module can utilize the brightness of ruddiness, green glow and the blue light of 26 pairs of light sources 22 of light source driving circuit.In the present embodiment, if light source 22 is a cold-cathode tube, then can utilize the brightness of redness, green and the blue pixel of adjusting 26 pairs of images of display driver circuit to carry out each self compensation.

Please refer to Fig. 6, Fig. 6 has the synoptic diagram of the 4th embodiment of the display device 20 of brightness and colour temperature control for the present invention.Among the 4th embodiment, optical sensor 28 is arranged on the display surface of display module 21, be used for detecting the brightness and the colour temperature of the image that display module 21 produced, optical sensor 28 is coupled to display driver circuit 26 and light source driving circuit 26, be used for detecting the brightness and the colour temperature of the image that display module 21 produced, display driver circuit 26 can calculate yield value according to feedback signal FB, data with update image signal 29, in addition, light source driving circuit 26 also can be adjusted the luminosity of light source 22 according to feedback signal FB.

In sum, the display device display device of the present invention with brightness and color temperature control system comprises a display module, a light source, a light source driving circuit, a display driver circuit and an optical sensor.Optical sensor is arranged at the periphery of light source, is used for the brightness and the colour temperature of detection light source.Optical sensor is coupled to display driver circuit, and feeds back signal to display driver circuit according to the brightness and the colour temperature generation one of light source.Display driver circuit receives a picture signal and drives the display module display image, so display driver circuit can come the data of update image signal according to feedback signal, reaches the brightness of adjusting image and the purpose of colour temperature.Moreover optical sensor also can be coupled to light source driving circuit, and then light source driving circuit can be adjusted the luminosity of light source according to the feedback signal that optical sensor produces, with the brightness of stabilized light source.Utilize the brightness of display driver circuit compensating images and colour temperature light source, and can carry out each self compensation the brightness of redness, green and the blue pixel of image applicable to any kind.

The above person of thought, it only is preferred embodiment of the present invention, when not limiting scope of the invention process with this, promptly the simple equivalent of being done according to claim of the present invention and invention description content generally changes and revises, and all still belongs in the scope that patent of the present invention contains.Arbitrary embodiment of the present invention in addition or claim needn't realize whole purpose disclosed in this invention or advantage or characteristics.In addition, summary part and title only are to be used for auxiliary patent document search usefulness, are not to be used for limiting interest field of the present invention.

Claims (13)

1. display device with brightness and color temperature control system comprises:

One display module;

One light source is adjacent to this display module;

One optical sensor is adjacent to this light source, is used for detecting this light source, to produce at least one feedback signal; And

One display driver circuit is coupled to this optical sensor, is used for receiving a picture signal and drives this display module showing an image, and adjust the data of this picture signal according to this feedback signal.

2. display device as claimed in claim 1 also comprises a light source driving circuit, is coupled to this optical sensor, is used for driving this light source, and adjusts the brightness of this light source according to this feedback signal.

3. display device as claimed in claim 1, wherein this light source comprises a cold-cathode tube (CCFL) or a light emitting diode.

4. display device as claimed in claim 1 also comprises an analog to digital converter, is coupled between this optical sensor and this display driver circuit, is used for converting the feedback signal that this optical sensor produces to a digital signal.

5. display device as claimed in claim 4, wherein this display driver circuit comprises a cardinar number device, is coupled to this analog to digital converter, is used for converting this digital signal to adjust this picture signal at least one yield value.

6. display device as claimed in claim 1, wherein this optical sensor comprises a ruddiness sensing unit, a green glow sensing unit and a blue light sensing unit.

7. control the brightness of display device and the method for colour temperature for one kind, comprise:

Detect the brightness and the colour temperature of a display device, to produce at least one feedback signal; And

Upgrade the data of a picture signal that drives this display device according to this feedback signal, to adjust the brightness and the colour temperature of the image that this display device shows.

8. method as claimed in claim 7 also comprises:

Adjust the brightness of a light source of this display device according to this feedback signal.

9. method as claimed in claim 7 also comprises:

Convert this feedback signal to a digital signal.

10. method as claimed in claim 9 also comprises:

This digital signal is converted at least one yield value that is used for adjusting this picture signal.

11. method as claimed in claim 7 wherein detects the brightness and the colour temperature of ruddiness, green glow and the blue light of the brightness of this display device and the light source that colour temperature detects this display device.

12. method as claimed in claim 11, wherein this at least one feedback signal is three feedback signals, and wherein upgrading this picture signal that drives this display device according to this feedback signal is to upgrade the picture signal of the ruddiness, a green glow and the blue light that drive this display device respectively according to this three feedback signal.

13. method as claimed in claim 11 also comprises:

Brightness according to ruddiness, green glow and the blue light of the light source of each this display device of self-adjusting of this feedback signal.

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