CN101482444B - Detection apparatus and detection method - Google Patents

Abstract

The invention discloses a detection apparatus suitable for detecting the penetration rate of a display panel, which comprises a light source, a first polarizer sheet, a photodetector, a second polarizer sheet, a first reflector and a second reflector; wherein, the light source and the photodetector are respectively configured on both sides of the display panel; the first polarizer sheet is disposed between the display panel and the light source; the second polarizer sheet is disposed between the display panel and the photodetector; the first reflector is disposed between the display panel and second polarizer sheet; and the second reflector is disposed between the display panel and first polarizer sheet. The light from the light source passes the polarizer sheet, the display panel, the first reflector, the display panel, the second reflector, the display panel and the second polarizer sheet in order, and incidents into the photodetector.

Description

Pick-up unit and detection method

Technical field

The invention relates to a kind of pick-up unit and detection method, and particularly relevant for a kind of phase difference value of display panel and the pick-up unit and detection method of penetrance of being used for.

Background technology

Social now multimedia technology is quite flourishing, is indebted to the progress of semiconductor element and display device mostly.With regard to display, have that high image quality, space utilization efficient are good, the LCD of low consumpting power, advantageous characteristic such as radiationless becomes the main flow in market gradually.

Show module (TFT-LCD module) with tft liquid crystal, it mainly is made of a display panels (liquid crystal display panel) and a module backlight (backlight module).Wherein, display panels normally is made of a thin-film transistor array base-plate (thin film transistor arraysubstrate), a colored optical filtering substrates (color filter substrate) and a liquid crystal layer that is disposed between this two substrates, and module backlight is in order to provide this display panels required area source, so that the liquid crystal display module reaches required display effect.

Usually after a slice display panel completed, the phase difference value of display panel (Retardation value) was fixing.Though the penetrance of phase difference value and display panel has certain relation, because the light that light source sent all can produce consume by display panel the time, therefore the penetrance of resulting display panel is usually less than the actual penetrance of display panel.For instance, cross display panel with laser penetration, again with laser intensity originally divided by laser by the intensity behind the display panel, to learn the penetrance of this display panel.Ideally, penetrance known just can and push away phase difference value.Yet,, and make the strength retrogression of laser owing to the glass substrate in the display panel, liquid crystal, polaroid (polarizer), parsing diaphragm (analyzer) all may absorb or reflector laser with pixel electrode.Therefore, with laser intensity originally divided by laser by the intensity behind the display panel, and then push away phase difference value and incorrect.

That is to say, utilize the resulting phase difference value of the method and can't represent the actual phase difference value of display panel.Therefore, develop the mensuration that the rotation polaroid, as TaiWan, China patent No. TW00440737, but this kind method needs complicated control system to control the rotation of polaroid.The precision of this kind mensuration depends on the precision that the control polaroid rotates.

Summary of the invention

The invention provides a kind of pick-up unit, can detect the penetrance of display panel.

The present invention provides a kind of detection method in addition, can use above-mentioned detection device to detect the penetrance and the phase difference value of display panel.

The present invention proposes a kind of pick-up unit, and it is suitable for detecting the penetrance of a display panel.This pick-up unit comprises a light source, one first polaroid, a photodetector, one second polaroid, at least one first catoptron and at least one second catoptron, and wherein light source is disposed at a side of display panel, and display panel is positioned on the light path of light source.First polaroid is disposed between display panel and the light source, and first polaroid is positioned on the light path of light source.Photodetector is positioned on the light path of light source, and photodetector and first polaroid lay respectively at the both sides of display panel.Second polaroid is disposed between display panel and the photodetector, and second polaroid is positioned on the light path of light source.First mirror arrangement is between the display panel and second polaroid.Second mirror arrangement is between the display panel and first polaroid, and the quantity of first catoptron equates with the quantity of second catoptron.The light that light source sent is incident to photodetector through first polaroid, display panel, first catoptron, display panel, second catoptron, display panel and second polaroid in regular turn.

In pick-up unit of the present invention, light source is a lasing light emitter.

In pick-up unit of the present invention, photodetector is a charge coupled cell photodetector (CCDphotodetector).

In pick-up unit of the present invention, photodetector is a CMOS (Complementary Metal Oxide Semiconductor) photodetector (CMOS photodetector).

In pick-up unit of the present invention, photodetector is a photodiode light detectors (photodiodephotodetector).

In pick-up unit of the present invention, display panel is a stable twisted nematic liquid crystal panel.

The present invention proposes a kind of detection method, and it is suitable for detecting a phase difference value and a penetrance of a display panel.This detection method comprises the following steps.One above-mentioned pick-up unit is provided, and display panel is placed between first catoptron and second catoptron.Use the light source irradiation display panel, and with photo-detector measurement one a light intensity T (1) and a light intensity T (N), wherein light intensity T (1) light of representing light source to send only passes the light intensity that display panel is measured, and the light that on behalf of light source, light intensity T (N) send passes the light intensity that N display panel measured by first catoptron and second catoptron.The one known penetrance and the curve of phase difference value are provided, and the coefficient of losses of the light that light source sent process display panel is L, and L=[A-T (1)]/A, wherein A represents the light intensity that light that light source sends is only measured through panel by first polaroid and second polaroid, and the penetrance Tr of display panel is:

$\mathrm{Tr}=\frac{T\left(1\right)(1-L^{N-1})}{T\left(N\right)}$

Then, by the curve of penetrance and phase difference value, obtain the phase difference value of display panel.

Based on above-mentioned, the light that measurement light source of the present invention is sent passes display panel and the resulting light intensity of display panel repeatedly, and by the known penetrance and the curve of phase difference value, and obtain phase difference value, therefore compared to prior art, detection method of the present invention is comparatively quick.In addition, pick-up unit of the present invention also can be applicable on the production line, so that carry out the detection of instant (real time).

Description of drawings

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:

Fig. 1 is the synoptic diagram of a kind of pick-up unit of one embodiment of the invention.

Fig. 2 is the known penetrance and the curve map of phase difference value.

The main element symbol description:

110: light source

120: photodetector

130: the first polaroids

140: the second polaroids

150a, 150b: first catoptron

160a, 160b: second catoptron

200: display panel

Embodiment

Fig. 1 is the synoptic diagram of a kind of pick-up unit of one embodiment of the invention.The pick-up unit of present embodiment is suitable for detecting the penetrance of a display panel 200.This pick-up unit comprises a light source 110, a photodetector 120, one first polaroid 130, one second polaroid 140, the first catoptron 150a, 150b and the second catoptron 160a, 160b.Light source 110 and photodetector 120 lay respectively at the both sides of display panel 200, and display panel 200 is positioned on the light path of light source 110.First polaroid 130 is disposed between display panel 200 and the light source 110, and first polaroid 130 is positioned on the light path of light source 110.The second catoptron 160a, 160b are disposed between the display panel 200 and first polaroid 130.Second polaroid 140 is disposed between display panel 200 and the photodetector 120, and second polaroid 140 is positioned on the light path of light source 110.The first catoptron 150a, 150b are disposed between the display panel 200 and second polaroid 140.

The light that light source 110 sent is incident to photodetector 120 through first polaroid 130, display panel 200, the first catoptron 150a, display panel 200, the second catoptron 160a, display panel 200, the first catoptron 150b, display panel 200, the second catoptron 160b, display panel 200 and second polaroid 140 in regular turn.In the present embodiment, the quantity of the first catoptron 150a, 150b equates with the quantity of the second catoptron 160a, 160b, just is all two catoptrons.Yet present embodiment also can only have the first catoptron 150a and the second catoptron 160b.In addition, light source 110 can be the light source of a lasing light emitter, infrared light light source, ultraviolet source, visible light source or other wavelength.Photodetector 120 is the photodetector of metal-oxide semiconductor (MOS) photodetector, charge coupled cell photodetector, photodiode light detectors or other kenels.In addition, display panel 200 for example is the stable twisted nematic display panel.

Below will describe for the phase difference value that uses this pick-up unit measurement display panel 200 and the method for penetrance.

Please continue with reference to figure 1, at first display panel 200 be placed between the first catoptron 150a, 160b and the second catoptron 160a, the 160b.Then, use light source 110 irradiation display panels 200, and with photodetector 120 measurements one a light intensity T (1) and a light intensity T (5), wherein light intensity T (1) light of representing light source 110 to be sent only passes the light intensity that display panel 200 is measured, and on behalf of light that light source 110 sent, light intensity T (5) pass the light intensity that 5 display panels 200 are measured by the first catoptron 150a, 150b and the second catoptron 160a, 160b.Bring light intensity T (1) and light intensity T (5) into following formula:

L＝[A-T(1)]/A (1)

$\mathrm{Tr}=\frac{T\left(1\right)(1-L^{N-1})}{T\left(N\right)}---\left(2\right)$

Please refer to formula (1), the light that on behalf of light source 110, A sent has only the light intensity of not measuring through panel by first polaroid 130 and second polaroid 140, just measures the influence for light intensity of first polaroid 130 and second polaroid 140.The light that on behalf of light source 110, T (N) sent passes display panel 200 N time.In the present embodiment, N is 5.The light that on behalf of light source 110, L sent passes through the coefficient of losses of display panel 200.

Please refer to formula (2), Tr represents the penetrance of display panel 200.

Fig. 2 is the known penetrance and the curve map of phase difference value.Please refer to Fig. 2, will just can learn phase difference value among the resulting penetrance Tr substitution of formula (2) Fig. 2.Below will this kind detection method be described by a concrete instance.

At first, measured A is 791 microwatts (micro-watt), and wherein the A light of representing light source to send has only the light intensity of measuring by one time first polaroid 130 and second polaroid 140.In addition, light intensity T (1) is 147 microwatts, and wherein light intensity T (1) light of representing light source 110 to be sent only passes the light intensity that display panel 200 is measured.Then, light intensity T (5) is 0.1894 microwatt, and wherein light intensity T (5) light of representing light source 110 to be sent only passes the light intensity that 5 display panels 200 are measured.It is 0.923482 that above-listed numerical value substitution formula (2) can be obtained penetrance Tr, then with this numerical value substitution Fig. 2, can learn that just phase difference value is 374 nanometers (am).It is many more to it should be noted that the light that is sent when light source 110 passes the number of times of display panel 200, and it is accurate more then to measure.Present embodiment does not limit and adopts the mode of tabling look-up to obtain phase difference value, and the curve of Fig. 2 also can convert formula to, and obtains obtaining phase difference value.

Compared to prior art, the present invention only needs light source 110, photodetector 120, the first catoptron 150a, 150b and the second catoptron 160a, 160b just can obtain the penetrance and the phase difference value of display panel 200, so the present invention does not need expensive Polarizer rot and control instrument.That is to say that compared to prior art, cost required for the present invention is lower.In addition, compared to prior art, the present invention can measure the penetrance and the phase difference value of display panel to be measured 200 fast.

Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.

Claims (7)

1. pick-up unit is suitable for detecting a penetrance of a display panel, and this pick-up unit comprises:

One light source be disposed at a side of this display panel, and this display panel is positioned on the light path of this light source;

One first polaroid is disposed between this display panel and this light source, and this first polaroid is positioned on the light path of this light source;

One photodetector is positioned on the light path of this light source, and this photodetector and this first polaroid lay respectively at the both sides of this display panel;

One second polaroid is disposed between this display panel and this photodetector, and this second polaroid is positioned on the light path of this light source;

At least one first catoptron is disposed between this display panel and this second polaroid; And

At least one second catoptron, be disposed between this display panel and this first polaroid, and the quantity of this at least one first catoptron equates that with the quantity of this at least one second catoptron wherein the light that this light source sent is incident to this photodetector through this first polaroid, this display panel, this first catoptron, this display panel, this second catoptron, this display panel and this second polaroid in regular turn.

2. pick-up unit as claimed in claim 1 is characterized in that, this light source is a lasing light emitter.

3. pick-up unit as claimed in claim 1 is characterized in that, this photodetector is a charge coupled cell photodetector.

4. pick-up unit as claimed in claim 1 is characterized in that, this photodetector is a CMOS (Complementary Metal Oxide Semiconductor) photodetector.

5. pick-up unit as claimed in claim 1 is characterized in that, this photodetector is a photodiode light detectors.

6. pick-up unit as claimed in claim 1 is characterized in that, this display panel is a stable twisted nematic display panel.

7. detection method is suitable for detecting a phase difference value and a penetrance of a display panel, and this detection method comprises:

One pick-up unit as claimed in claim 1 is provided, and this display panel is placed between this first catoptron and this second catoptron;

Use this display panel of this light source irradiation, and with this photo-detector measurement one a light intensity T (1) and a light intensity T (N), wherein this light intensity T (1) light of representing this light source to send only passes once the light intensity that this display panel is measured, and the light that on behalf of this light source, this light intensity T (N) send passes the light intensity that N this display panel measured by this first catoptron and this second catoptron;

The one known penetrance and the curve of phase difference value are provided, and the coefficient of losses of this display panel of the light that this light source sent process is L, and L=[A-T (1)]/A, the light intensity only measured of the A light of representing this light source to send wherein by this first polaroid and this second polaroid, and this penetrance Tr of this display panel is:

$\mathrm{Tr}=\frac{T\left(1\right)(1-L^{N-1})}{T\left(N\right)}$ And

By the curve of this known penetrance and phase difference value, obtain this phase difference value of this display panel.

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