TWI621895B - Display panel - Google Patents

Abstract

A display panel includes a first substrate, a pixel unit, an encapsulation material, a first measurement unit, a second measurement unit, a second substrate, a liquid crystal layer, a first light shielding pattern, and a second light shielding pattern. The first substrate has a pixel area, a package area surrounding the pixel area, and a peripheral area between the pixel area and the package area. The pixel unit is arranged in the pixel area. The encapsulation material is disposed in the package area. The first and second measuring units for measuring the voltage holding ratio of the display panel are disposed in the peripheral area. The first and second light shielding patterns are respectively disposed on the first and second substrates. The projected area of the first measuring unit overlaps at least one of the first light blocking pattern and the second light blocking pattern. The projected area of the second measuring unit does not substantially overlap the first light blocking pattern and the second light blocking pattern.

Description

Display panel

The present invention relates to a display device, and more particularly to a display panel.

With the rapid development of display technology, the consumer demand for image quality of display panels is increasing. In addition to the specifications of the display panel such as resolution, color saturation, and reaction time, the specifications for the comparison of the display panels are also increasing. Therefore, the prior art has developed a Polymer-Stabilized Alignment (PSA) type liquid crystal display panel to improve the contrast of the liquid crystal display panel.

A method of manufacturing a polymer stabilized alignment type liquid crystal display panel includes the following steps. First, a photopolymerizable monomer is mixed in a liquid crystal material. Next, a liquid crystal material which has been mixed with the photopolymerizable monomer is filled in the display panel. Then, a voltage is applied to the liquid crystal material to cause the liquid crystal molecules to have a pretilt angle; at the same time, the display panel is irradiated with ultraviolet (UV) light to complete the stabilization of the polymer and fix the pretilt angle of the liquid crystal molecules. Through the polymer stable alignment technology, the dark state light leakage of the liquid crystal display panel can be greatly improved, and the reaction time can be improved and the wide viewing angle can be achieved.

However, in the process of the above display panel, ultraviolet light for polymerizing the photopolymerizable monomer may damage the liquid crystal, causing deterioration of the liquid crystal and a decrease in resistance. In general, after a test period (for example, 60 to 90 days), display defects caused by liquid crystal deterioration, such as frame mura, image sticking, etc., will appear in In the display panel. In other words, in the prior art, it is impossible to monitor the condition of the liquid crystal molecules in the display panel in real time, and it is not possible to predict whether the display panel has a related display defect problem.

The invention provides a display panel, wherein the voltage holding ratio of the liquid crystal layer can be measured to monitor the condition of the liquid crystal layer of the display panel in real time.

The display panel of the present invention includes a first substrate, a plurality of pixel units, an encapsulation material, a first measurement unit, a second measurement unit, a second substrate, a liquid crystal layer, a first light shielding pattern, and a second light shielding pattern. The first substrate has a pixel region, a package region surrounding the pixel region, and a peripheral region between the pixel region and the package region. The plurality of pixel units are disposed in a pixel area of the first substrate. The encapsulation material is disposed in a package area of the first substrate. The first measuring unit and the second measuring unit are disposed in a peripheral area of the first substrate and configured to measure a voltage holding ratio of the display panel. The second substrate is disposed opposite to the first substrate. The liquid crystal layer is disposed in a space defined by the first substrate, the encapsulating material, and the second substrate. The first light shielding pattern is disposed on the first substrate. The second light shielding pattern is disposed on the second substrate. The projected area of the first measuring unit overlaps at least one of the first light blocking pattern and the second light blocking pattern. The projected area of the second measuring unit does not substantially overlap the first light blocking pattern and the second light blocking pattern.

Based on the above, the first and second measuring units of the display panel according to the embodiment of the present invention can instantly measure the first voltage holding ratio of the shaded pattern shielding area of the display panel and the second voltage of the masked area of the non-shielding pattern. Retention rate. By comparing the first and second voltage holding ratios, the degree of deterioration of the liquid crystal layer of the display panel can be instantly determined, thereby predicting or assisting in judging whether the display panel is prone to related display abnormalities.

The above described features and advantages of the invention will be apparent from the following description.

1 is a top plan view of a display panel in accordance with an embodiment of the present invention. 2 is an enlarged schematic view showing a portion R of a peripheral region of the display panel of FIG. 1. 3 is a cross-sectional view of a display panel in accordance with an embodiment of the present invention. In particular, the cross section of Fig. 3 corresponds to the line A-A' of Fig. 2 and the line B-B' of Fig. 1.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the display panel 100 includes a first substrate 110 , a plurality of pixel units 120 , a packaging material 130 , a second substrate 140 , and a liquid crystal layer 150 . The first substrate 110 has a pixel region 110a, a package region 110b surrounding the pixel region 110a, and a peripheral region 110c between the pixel region 110a and the package region 110b. In this embodiment, the first substrate 110 further has a shelf area 110d. The frame area 110d is located between the package material 130 and the edge of the first substrate 110, but the invention is not limited thereto. The pixel unit 120 is disposed in the pixel area 110a of the first substrate 110. The encapsulation material 130 is disposed on the package region 110c of the first substrate 110. The second substrate 140 is disposed opposite to the first substrate 110. The liquid crystal layer 150 is disposed in a space defined by the first substrate 110, the encapsulation material 130, and the second substrate 140. In this embodiment, the material of the first substrate 110 and/or the second substrate 140 may be glass, quartz, organic polymer, or an opaque/reflective material (eg, conductive material, wafer, ceramic, or other). Applicable materials), or other applicable materials.

The encapsulating material 130 is also referred to as Sealant. In this embodiment, the liquid crystal dropping (ODF) method can be selectively used to drop the liquid crystal into the space surrounded by the first substrate 110 and the encapsulating material 130, thereby completing the display panel 100; The encapsulating material 130 includes, for example, a first colloid and a spacer mixed into the first colloid. However, the present invention is not limited thereto, and in other embodiments, the display panel 100 may be formed by other means. For example, in another embodiment, the vacuum encapsulation method may be used to inject liquid crystal into the space surrounded by the first substrate 110, the second substrate 140, and part of the encapsulation material 130, thereby completing the display panel 100; The encapsulating material 130 may include, in addition to the first colloid having the injection port and the interstitial mixed in the first colloid, a second colloid for sealing the injection port.

The pixel unit 120 includes a thin film transistor T disposed on the first substrate 110 and a pixel electrode 122 electrically connected to the thin film transistor T. In the present embodiment, the thin film transistor T includes a gate G, a gate insulating layer GI, a semiconductor layer SE, a source S and a drain D, and the pixel electrode 122 is electrically connected to the drain D of the thin film transistor T. For example, in this embodiment, the gate G can be disposed on the first substrate 110, the gate insulating layer GI can cover the gate G, and the semiconductor layer SE can be disposed on the gate insulating layer GI, the source S and the drain D may be disposed on a portion of the semiconductor layer SE and electrically connected to different two regions of the semiconductor layer SE, respectively. In this embodiment, the gate G may be located below the semiconductor layer SE, and the thin film transistor T may be a bottom gate TFT thin film transistor. However, the present invention is not limited thereto. In other embodiments, the thin film transistor T may also be a top gate TFT or other suitable type of thin film transistor.

In the present embodiment, the pixel unit 120 can selectively include the common electrode 124. The potential difference between the common electrode 124 and the pixel electrode 122 can drive the liquid crystal molecules of the liquid crystal layer 150, thereby causing the display panel 100 to display a screen. For example, in this embodiment, the common electrode 124 and the pixel electrode 122 may be disposed on the same substrate (ie, the first substrate 110), and the common electrode 124 overlaps the pixel electrode 122. In detail, in the present embodiment, the first insulating layer BP1 covers the thin film transistor T, the pixel electrode 122 and the common electrode 124 are disposed on the first insulating layer BP1, and the second insulating layer BP2 is disposed on the pixel electrode 122. Between the common electrode 124 and the common electrode 124. One of the common electrode 124 and the pixel electrode 122 (for example, the pixel electrode 122) has a plurality of slits 122a, and the other of the common electrode 124 and the pixel electrode 122 (for example, the common electrode 124) overlaps with the slit 122a. . In short, the display panel 100 of the embodiment may be a display panel of a Fringe-Field Switching (FFS) mode. However, the present invention is not limited thereto. In other embodiments, the pixel electrode 122 and the common electrode 124 may also be selectively disposed on the first substrate 110 and the second substrate 140, respectively, and the display panel 100 may also be twisted. Display panel of Twisted Nematic (TN), Super Twisted Nematic (STN), Vertical Alignment (VA), Optically Compensated Birefringence (OCB) or other suitable mode .

It is to be noted that the display panel 100 includes a voltage holding ratio measurement group V disposed in the peripheral region 110c. For example, in the embodiment, the display panel 100 may include four voltage holding ratio measurement groups V, and the four voltage holding rate measurement groups V may be respectively disposed near the four corners of the first substrate 110. However, the present invention is not limited thereto, and the number and position of the voltage holding ratio measurement group V may be determined depending on actual needs. Each voltage hold rate measurement group V includes a first measurement unit 162 and a second measurement unit 164 that are electrically independent of each other. The first measuring unit 162 and the second measuring unit 164 are configured to measure the voltage holding ratio (VHR) of the display panel 100. The first measuring unit 162 and the second measuring unit 164 are disposed in the peripheral area 110c of the first substrate 110. The first measuring unit 162 and the second measuring unit 164 are located between the pixel unit 120 and the encapsulating material 130 and overlap with the liquid crystal layer 150. In the embodiment, the display panel 100 further includes an alignment film PI. The alignment film PI covers the first measurement unit 162 and the second measurement unit 164 and is located between the liquid crystal layer 150 and the first measurement unit 162 and between the liquid crystal layer 150 and the second measurement unit 164.

The display panel 100 further includes a first light blocking pattern 170 and a second light blocking pattern 180 respectively disposed on the first substrate 110 and the second substrate 140. The first measurement unit 162 is located between the first light shielding pattern 170 and the second light shielding pattern 180 . The projected area of the first measuring unit 162 is overlapped with at least one of the first light blocking pattern 170 and the second light blocking pattern 180, and the projected area of the second measuring unit 164 does not substantially overlap the first light blocking pattern 170 and the second Shading pattern 180. Thereby, in the process of the display panel 100, the light beam (for example, UV light) that illuminates the display panel 100 is less likely to be irradiated to the portion of the liquid crystal layer 150 overlapping the first measuring unit 162, and is easily irradiated to the second measurement. A portion of the liquid crystal layer 150 that the cells 164 overlap. The first voltage holding ratio measured by the first measuring unit 162 can be regarded as the control data, and the second voltage holding rate measured by the second measuring unit 164 can be regarded as the experimental group data. Comparing the first voltage holding ratio and the second voltage holding ratio, the degree of deterioration of the liquid crystal layer 150 (for example, deterioration by the light beam irradiation) can be immediately determined, thereby predicting or assisting whether the display panel 100 is liable to generate an associated display abnormality, for example, : Frame mura, image sticking, etc.

In this embodiment, the projected area of the first measuring unit 162 may overlap the first light blocking pattern 170 and the second light blocking pattern 180. Therefore, regardless of whether the light beam illuminating the display panel 100 is from above or below the display panel 100, part of the liquid crystal layer 150 overlapping the first measuring unit 162 is not easily irradiated by the light beam, and is measured by the first measuring unit 162. The first voltage holding ratio can be used as a reference for whether or not the liquid crystal layer 150 is damaged by the light beam. However, the present invention is not limited thereto. In another embodiment, if the light beam that illuminates the display panel 100 comes from below the display panel 100 (ie, when it is transmitted along the direction d1 shown in FIG. 3), the first one may be selectively set. The light shielding pattern 170 is not provided with the second light shielding pattern 180; in another embodiment, if the light beam that illuminates the display panel 100 comes from above the display panel 100 (ie, when it is transmitted along the direction d2 shown in FIG. 3), it is optional. The second light blocking pattern 180 is disposed without setting the first light blocking pattern 170.

In this embodiment, the process of the first light shielding pattern 170 can be integrated into an existing process of the display panel. For example, in the embodiment, the first light shielding pattern 170 is selectively formed on the same film layer as the source S and/or the drain D of the thin film transistor T. The material of the first light shielding pattern 170 may be the same as the material of the source S and/or the drain D. However, the present invention is not limited thereto. In other embodiments, the first light shielding pattern 170 may also be selectively formed on the same film layer as other members of the display panel 100 (eg, the gate G), and the first light shielding pattern 170 The material of the display panel 100 can also be the same as that of other components of the display panel 100 (for example, the gate G). In this embodiment, the material of the first light shielding pattern 170 may be selectively a conductive material, such as a metal, an alloy, a nitride of a metal material, an oxide of a metal material, an oxynitride of a metal material, or a metal material. A stacked layer with other conductive materials. In addition, in order to prevent the conductive first light-shielding pattern 170 from affecting the measurement results of the first measurement unit 162 and/or the second measurement unit 164, the first light-shielding pattern 170 may be selectively grounded, but the present invention does not limit.

In this embodiment, the process of the second light shielding pattern 180 can also be integrated into the existing process of the display panel. For example, in the embodiment, the display panel 100 further includes a third light-shielding pattern 190 (shown in FIG. 3) disposed on the pixel area 110a for shielding light leakage between the pixel units 120, and the second light-shielding pattern 180. The material of the second light-shielding pattern 180 and the material of the third light-shielding pattern 190 may be the same, but the invention is not limited thereto. In this embodiment, the material of the second light shielding pattern 180 may be an insulating light shielding material, for example, a black resin. However, the present invention is not limited thereto. In other embodiments, the material of the second light shielding pattern 180 may also be a conductive light shielding material, such as a low reflection metal (for example, chromium or the like). Similarly, if the second light shielding pattern 180 is electrically conductive, in order to prevent the second light shielding pattern 180 from affecting the measurement results of the first measurement unit 162 and/or the second measurement unit 164, the second light shielding pattern 180 may be selectively grounded. However, the invention is not limited thereto.

In the embodiment, the first measuring unit 162 includes a first input electrode 162a and a first output electrode 162b. The first input electrode 162a and the first output electrode 162b are electrically independent of each other and are located between the first light shielding pattern 170 and the second light shielding pattern 180. In this embodiment, the first input electrode 162a and the first output electrode 162b may be disposed on the second insulating layer BP2. Furthermore, the first input electrode 162a, the first output electrode 162b, and the pixel electrode 122 may be formed on the same film layer, and the materials of the first input electrode 162a, the first output electrode 162b, and the pixel electrode 122 may be the same. In other words, the processes of the first input electrode 162a and the first output electrode 162b can be integrated into the existing process of the display panel without additionally creating a photomask for the first measurement unit 162, thereby increasing the cost. In this embodiment, the material of the first input electrode 162a, the first output electrode 162b, and the pixel electrode 122 may be a transparent conductive material, such as: indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide. , indium antimony zinc oxide, or other suitable oxide, or a stacked layer of at least two of the above, but the invention is not limited thereto.

In the embodiment, the second measuring unit 164 includes a second input electrode 164a and a second output electrode 164b. The second input electrode 164a and the second output electrode 164b are electrically independent of each other and are offset from the first light blocking pattern 170 and the second light blocking pattern 180. The second input electrode 164a and the second output electrode 164b do not overlap the first light blocking pattern 170 and the second light blocking pattern 180. In this embodiment, the second input electrode 164a and the second output electrode 164b may be disposed on the second insulating layer BP2. Furthermore, the second input electrode 164a, the second output electrode 164b, and the pixel electrode 122 may be formed on the same film layer, and the materials of the second input electrode 164a, the second output electrode 164b, and the pixel electrode 122 may be the same. In other words, the processes of the second input electrode 164a and the second output electrode 164b can be integrated into the existing process of the display panel without additionally creating a photomask for the second measurement unit 164, thereby increasing the cost. In this embodiment, the material of the second input electrode 164a and the second output electrode 164b may be a transparent conductive material, such as: indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium antimony zinc. An oxide, or other suitable oxide, or a stacked layer of at least two of the foregoing, but the invention is not limited thereto.

Referring to FIG. 2 and FIG. 3, in the embodiment, the shape of the first input electrode 162a is substantially the same as the shape of the second input electrode 164a, and the shape of the first output electrode 162b and the shape of the second output electrode 164a are substantially Similarly, the distance D1 between the first input electrode 162a and the first output electrode 162b is substantially equal to the distance D2 between the second input electrode 164a and the second output electrode 164b, and the first input electrode 162a and the second input electrode 164a The materials of the first output electrode 162b and the second output electrode 164b are the same. In other words, in the present embodiment, the first measuring unit 162 itself and the second measuring unit 164 itself have substantially the same resistance and capacitance. Thereby, the degree to which the liquid crystal layer 150 is affected by the light beam can be more accurately determined.

Referring to FIG. 3, in the embodiment, the display panel 100 further includes a first insulating layer BP1. The first insulating layer BP1 is disposed on the first substrate 110 and covers the first light shielding pattern 170. The display panel 100 also includes a shield electrode 192. The shielding electrode 192 is disposed on the first insulating layer BP1 and between the first measuring unit 162 and the first light shielding pattern 170 and between the second measuring unit 164 and the first substrate 110. The second insulating layer BP2 covers the shield electrode 192. In this embodiment, the shield electrode 192 may have no holes, and completely shield the first measurement unit 162 and the second measurement unit 164. The shielding electrode 192 can prevent the conductive member on the first substrate 110, for example, a portion of the data line (not shown) extending to the peripheral region 110c, a portion of the scan line (not shown) extending to the peripheral region 110c, and the gate A drive circuit (Gate on Array, GOA; not shown) or the like affects the measurement results of the first measurement unit 162 and the second measurement unit 164, and more accurately determines the extent to which the liquid crystal layer 150 is affected by the light beam. In this embodiment, the shield electrode 192 can be grounded, but the invention is not limited thereto.

In the present embodiment, the process of the shield electrode 192 can be integrated into the existing process of the display panel 100. For example, in the embodiment, the shield electrode 192 and the common electrode 124 may be formed on the same film layer, and the material of the shield electrode 192 and the material of the common electrode 124 may be the same. In this embodiment, the shielding electrode 192 can be a transparent electrode, and the material thereof is, for example, indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium antimony zinc oxide, or other suitable oxidation. Or a stacked layer of at least two of the above. However, the present invention is not limited thereto. In other embodiments, if the light beam is irradiated from above the display panel 100 to the liquid crystal layer 150, the shield electrode 192 does not have to be a transparent electrode, and the shield electrode 192 may also be an opaque electrode.

4 shows a method of measuring a voltage holding ratio of a display panel according to an embodiment of the present invention. Referring to FIG. 4 , firstly, the display panel 100 is provided. The display panel 100 has a pad P disposed in the frame region 110 d , and the voltage holding ratio measuring group V is electrically connected to the pad P by the wire L. Next, the probe 210 of the oscilloscope 200 is electrically contacted with the pad P. Thereby, the oscilloscope 200 can read the electrical signals on the first measuring unit 162 and the second measuring unit 164 of the voltage holding rate measuring group V to obtain the control data of the voltage holding ratio and the experimental group data, thereby determining The degree of deterioration of the liquid crystal layer 150 (or the degree of change in the resistance of the liquid crystal). It should be noted that FIG. 4 is an example of measuring a piece of display panel 100. However, the present invention is not limited thereto, and in other embodiments, a plurality of display panels in the display mother board may be measured by a similar method before the display mother sheet is not cut into a plurality of display panels.

FIG. 5 shows a method of measuring a voltage holding ratio of a display panel according to another embodiment of the present invention. Referring to FIG. 5, first, the aforementioned display panel 100 is provided. Next, a processing unit 300 (for example, an IC) is disposed on the display panel 100, and the processing unit 300 is electrically connected to the voltage holding ratio measurement group V through the wire L. The processing unit 300 can read the electrical signals on the first measurement unit 162 and the second measurement unit 164 of the voltage retention rate measurement group V to obtain the control data of the voltage retention rate and the experimental group data, thereby determining the liquid crystal layer. 150 degrees of deterioration.

In summary, the display panel according to an embodiment of the invention includes a first substrate, a pixel unit, a packaging material, a second substrate, and a liquid crystal layer. The first substrate has a pixel region, a package region surrounding the pixel region, and a peripheral region between the pixel region and the package region. The pixel unit is arranged in the pixel area. The encapsulation material is disposed in the package area. The second substrate is disposed opposite to the first substrate. The liquid crystal layer is disposed in a space defined by the first substrate, the encapsulating material, and the second substrate. In particular, the display panel further includes first and second measuring units disposed in the peripheral area. The first measuring unit is shielded by the light shielding pattern, and the second measuring unit is not shielded by the light shielding pattern. The first voltage holding ratio measured by the first measuring unit can be regarded as the control data, and the second voltage holding rate measured by the second measuring unit can be regarded as the experimental group data. Comparing the first voltage holding ratio and the second voltage holding ratio, the degree of deterioration of the liquid crystal layer of the display panel can be instantly determined, thereby predicting or assisting in judging whether the display panel is prone to related display abnormality.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ display panel
110‧‧‧First substrate
110a‧‧‧Photo District
110b‧‧‧Packing area
110c‧‧‧ surrounding area
110d‧‧‧Border area
120‧‧‧ pixel unit
122‧‧‧pixel electrodes
122a‧‧‧slit
124‧‧‧Common electrode
130‧‧‧Packaging materials
140‧‧‧second substrate
150‧‧‧Liquid layer
162‧‧‧First measuring unit
162a‧‧‧first input electrode
162b‧‧‧first output electrode
164‧‧‧Second measurement unit
164a‧‧‧second input electrode
164b‧‧‧second output electrode
170‧‧‧ first shade pattern
180‧‧‧second shade pattern
190‧‧‧ Third shade pattern
192‧‧‧Shield electrode
200‧‧‧ oscilloscope
210‧‧‧ probe
300‧‧‧Processing unit
A-A', B-B'‧‧‧ cut line
BP1‧‧‧first insulation
BP2‧‧‧Second insulation
D‧‧‧汲
D1, D2‧‧‧ distance
D1, d2‧‧‧ direction
G‧‧‧ gate
GI‧‧‧ brake insulation
L‧‧‧ wire
P‧‧‧ pads
PI‧‧‧ alignment film
R‧‧‧ partial
SE‧‧‧Semiconductor layer
S‧‧‧ source
T‧‧‧film transistor
V‧‧‧Voltage Retention Measurement Group

1 is a top plan view of a display panel in accordance with an embodiment of the present invention. 2 is a partially enlarged schematic view showing a peripheral portion of the display panel of FIG. 1. 3 is a cross-sectional view of a display panel in accordance with an embodiment of the present invention. 4 shows a method of measuring a voltage holding ratio of a display panel according to an embodiment of the present invention. FIG. 5 shows a method of measuring a voltage holding ratio of a display panel according to another embodiment of the present invention.

Claims (10)

A display panel includes: a first substrate having a pixel region, a package region surrounding the pixel region, and a peripheral region between the pixel region and the package region; a pixel region of the first substrate; a package material disposed in the package region of the first substrate; a first measurement unit and a second measurement unit disposed in the peripheral region of the first substrate, The second substrate is disposed opposite to the first substrate; a liquid crystal layer is disposed on the first substrate, the encapsulating material, and the second substrate. a first light-shielding pattern disposed on the first substrate; and a second light-shielding pattern disposed on the second substrate, wherein a projected area of the first measuring unit overlaps the first light-shielding pattern At least one of the second shading patterns, and a projected area of the second measuring unit does not substantially overlap the first shading pattern and the second shading pattern. The display panel of claim 1, wherein the first measuring unit comprises: a first input electrode and a first output electrode, electrically independent of each other and located in the first light shielding pattern and the second light shielding The second measuring unit comprises: a second input electrode and a second output electrode electrically independent from each other and offset from the first light shielding pattern and the second light shielding pattern. The display panel of claim 2, wherein the shape of the first input electrode is the same as the shape of the second input electrode, the shape of the first output electrode is the same as the shape of the second output electrode, and The distance between the first input electrode and the first output electrode is equal to the distance between the second input electrode and the second output electrode. The display panel of claim 3, wherein materials of the first input electrode, the second input electrode, the first output electrode, and the second output electrode are the same. The display panel of claim 2, further comprising: a first insulating layer disposed on the first substrate and covering the first light shielding pattern; and a shielding electrode disposed on the first insulating layer And between the first measuring unit and the first light shielding pattern and between the second measuring unit and the first substrate. The display panel of claim 5, wherein the shielding electrode and the first light shielding pattern are grounded. The display panel of claim 5, wherein the display panel further comprises: a second insulating layer covering the shielding electrode, wherein the first input electrode, the first output electrode, the second input electrode, and The second output electrode is disposed on the second insulating layer. The display panel of claim 7, wherein each of the pixel units comprises: a thin film transistor disposed on the first substrate; a pixel electrode electrically connected to the thin film transistor; A common electrode is overlapped with the pixel electrode, wherein the second insulating layer is located between the pixel electrode and the common electrode. The display panel of claim 8, wherein the material of the shielding electrode is the same as the material of the common electrode and the pixel electrode, the first input electrode, the first output electrode, the first The materials of the two input electrodes and the second output electrode are the same as those of the other of the common electrode and the pixel electrode. The display panel of claim 8, wherein the thin film transistor has a source, a drain, and a gate, and the material of the first light shielding pattern and the source, the drain, and the gate At least one of the poles has the same material.