JP5187117B2 - Optical property measuring device - Google Patents

Description

  The present invention relates to an optical characteristic measuring apparatus for measuring optical characteristics of a display device.

  In the manufacturing process of the display device, the optical characteristics of the display unit are measured by measuring physical quantities such as luminance and chromaticity of the display unit of the display device. For the measurement of the optical characteristics of the display unit, a measuring device including a sensor facing the display unit is used.

  When measuring the optical characteristics of the display unit of the display device, the externally incident light (so-called ambient light) is blocked so that only the light from the display unit is incident on the sensor. There is a need. As a method for shielding ambient light, there is a method in which the display unit is placed in a dark room when measuring optical characteristics. However, measurement in a dark room is time-consuming and much time and cost are required for manufacturing.

  Therefore, a measuring instrument has been proposed in which at least part of the display unit is in close contact with the display unit so that ambient light does not enter the sensor (see, for example, US Pat. No. 7,072,140). A conventional measuring instrument will be described with reference to the drawings. FIG. 12 is a side view of a conventional optical characteristic measuring apparatus, and FIG. 13 is a rear view of the optical characteristic measuring apparatus shown in FIG. As shown in FIG. 12, the optical property measuring device E is disposed behind the main body 91 and the opening 911 formed in the back surface portion 910 of the main body 91 and is a light receiving element 92 that is a sensor for measuring the luminance of the display unit. And a light-shielding portion 93 disposed so as to surround the outer peripheral portion of the back surface portion 910.

When the display device for measuring the optical characteristics is a liquid crystal display device, the liquid crystal display device is pressed and pressure is applied, so that the optical characteristics in the vicinity of the portion where the pressure is applied are changed. Therefore, in order to suppress the change in the optical characteristics due to the pressure, the optical characteristic measuring apparatus E light shielding part 93 shown in FIGS. 12 and 13 is opened to reduce the influence of the pressure from the light shielding part 93 on the optical characteristics. It is formed at a position away from the portion 911. Further, the light shielding portion 93 has a buffering property. By using the light-shielding part 93 having buffering properties, it is possible to reduce the pressure acting on the display part from the light-shielding part 93 by pressing the optical property measuring device E against the display part.
US Pat. No. 7,072,140

  Many of the display units of the display device have optical characteristics that change with temperature. When measuring the optical characteristics using the optical characteristic measuring apparatus E as shown in FIGS. 12 and 13, there is no escape space for the heat released in the space surrounded by the light shielding portion 93, and the inside of the space surrounded by the light shielding portion 93. The temperature of the air rises, the temperature of the surface of the display portion rises greatly, and the optical characteristics change greatly due to the temperature rise, making it difficult to accurately measure the optical characteristics of the display portion.

  Accordingly, an object of the present invention is to provide an optical characteristic measuring device that can accurately measure the optical characteristics of a display unit of a display device under a normal environment.

  In order to achieve the above object, the present invention provides an optical characteristic measuring apparatus for measuring the optical characteristics of a display unit of a display device, and a main body unit having a planar back surface portion opposed to the display unit; An optical sensor that receives light incident from an opening formed in the back surface portion, and a support portion that is disposed at a peripheral edge portion of the back surface portion and keeps the distance between the display portion and the back surface portion constant. And is disposed so as to surround the edge of the opening of the back surface portion, and includes a light shielding portion that is in close contact with the surface of the display portion when measuring the optical characteristics. A through hole is formed in a side portion of the unit at a position where light is not irradiated on the surfaces of the optical sensor and the display unit.

  According to this configuration, external light is blocked by the light shielding unit, and light does not enter the optical sensor, so that the optical characteristics of the display unit in a normal environment can be accurately measured. In addition, since the distance between the back surface portion and the display portion is kept constant, heat is likely to be released to the outside. Furthermore, since the through hole is formed, the heat inside the light shielding portion can be effectively discharged to the outside.

  As a result, an increase in the temperature of the surface of the display unit can be reduced, so that a change in optical characteristics due to a temperature change in the measured part of the display unit can be reduced, and the optical characteristics of the display unit can be reduced. It is possible to measure with high accuracy.

  The said structure WHEREIN: The said light-shielding part may be formed so that at least the inner surface of a side wall part may hardly reflect or absorb light.

  In the above configuration, the measurement of the optical characteristic is performed in a state where the display unit is erected, and the through hole is formed at least at the upper part and the lower part of the light shielding unit when performing the optical measurement. It may be. According to this configuration, the ascending air flow generated by the heat dissipated from the display unit passes through the through hole, so that the heat inside the light shielding unit can be effectively removed effectively.

  In the above configuration, a plurality of fins may be arranged in the length direction of the light shielding portion in the through hole. Further, at least some of the plurality of fins may be formed in parallel with the back surface portion.

  In the above configuration, the fins disposed on the side close to the back surface portion may be disposed so as to be inclined away from the back surface portion from the outer wall side to the inner wall side of the light shielding portion, The fins arranged on the near side may be arranged to be inclined so as to approach the back surface part from the outer wall side of the light shielding part toward the inner wall side.

  According to this configuration, since the fins are attached at an angle, light incident on the through-hole toward the optical sensor and / or the display unit can be blocked with a small number of fins. Less.

  In the above configuration, the back surface portion is disposed at at least one of the left and right ends when the optical property is measured, and the light shielding wall portion blocks light passing between the back surface portion and the display portion. May be provided.

  The said structure WHEREIN: The said light-shielding wall part may be non-contact with the said display part, when the measurement of the said optical characteristic is performed.

  The said structure WHEREIN: The said support part may be formed so that the distance of the said back part and the said display part when measuring the said optical characteristic may be 15 mm or more.

  In the above structure, examples of the display unit include a liquid crystal panel and a plasma panel.

  The said structure WHEREIN: At least one part of the said support part may serve as the said light-shielding part. As a result, the structure of the optical property measuring apparatus can be simplified, and it is possible to save labor and time for manufacturing.

  ADVANTAGE OF THE INVENTION According to this invention, the optical characteristic measuring apparatus which can measure the optical characteristic of the display part of a display apparatus correctly under a normal environment can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of the state measured by the optical characteristic measuring apparatus according to the present invention, FIG. 2 is a rear view of the optical characteristic measuring apparatus shown in FIG. 1, and FIG. 3 is an optical characteristic shown in FIG. It is the perspective view seen from the back side of the measuring device. In the following embodiments, a liquid crystal panel used in a liquid crystal display device is described as an example of a display unit whose optical characteristics are measured.

  As shown in FIG. 1, the optical characteristic measuring apparatus A is pressed against a standing liquid crystal panel LP to measure the optical characteristics of the liquid crystal panel LP. As shown in FIGS. 1 to 3, the optical characteristic measuring apparatus A measures the optical characteristics arranged inside the main body 1 having a rectangular back surface and the opening 11 formed in the back surface portion 10 of the main body 1. The light receiving element 2 that is a sensor, the four support portions 3 disposed at the four corners of the rectangular back surface portion 10, and the cylindrical light shielding portion 4 disposed so as to surround the opening 11 of the back surface portion 10. I have.

  The light receiving element 2 is a sensor for measuring luminance which is one of the optical characteristic values of the liquid crystal panel. In addition, as a measurement of the optical characteristic of a liquid crystal panel, you may measure chromaticity other than a brightness | luminance, a response speed, contrast, etc. Further, a plurality of parameters may be measured.

  The four support portions 3 arranged at the four corners of the back surface portion 10 of the main body 1 have the same length. The front end portion of the support portion 3 includes a buffer portion 31 formed of a material that can disperse force. The light shielding portion 4 is a cylindrical member and is formed of a material that does not easily transmit light (for example, a black resin material). The inner diameter of the light shielding portion 4 is substantially the same as the inner diameter of the opening 11 (the reason will be described later). A buffer portion 41 that can disperse force is formed at the tip of the light shielding portion 4 in the same manner as the support portion 3. Further, the light shielding part 4 is formed with a through hole 42 penetrating through the upper part and the lower part when the optical property measuring apparatus A is arranged in the liquid crystal panel LP. The support part 3 and the light shielding part 4 are arranged apart from each other.

  A measurement state of optical characteristics of a liquid crystal panel, which is an example of a display unit of a display device, will be described with reference to the drawings using the optical characteristic measurement apparatus A according to the present invention.

  The optical characteristic measuring apparatus A measures the luminance with the back surface portion 10 facing the liquid crystal panel LP. The optical property measuring apparatus A is configured so that the back surface portion 10 of the main body 1 is parallel to the liquid crystal panel LP and the back surface 10 and the liquid crystal panel LP are kept at a predetermined length. Are supported by support portions 3 formed at the four corners. At this time, the buffer portion 41 formed at the tip of the light shielding portion 4 is in close contact with the liquid crystal panel LP so as to surround the measurement target portion of the liquid crystal panel LP. The buffer portion 41 does not form a gap between the buffer portion 41 and the liquid crystal panel LP, and suppresses external light from entering the cylinder of the light shielding portion 4.

  Since the buffer part 31 and the buffer part 41 can disperse the force when the optical property measuring apparatus A is pressed against the liquid crystal panel LP, the pressure acting on the liquid crystal panel LP can be reduced. Thereby, while being able to suppress that the surface of liquid crystal panel LP is damaged, the change of the brightness | luminance of liquid crystal panel LP by the pressure which acts on liquid crystal panel LP from the buffer part 31 and the buffer part 41 can be prevented, More accurate luminance can be measured.

  The light-shielding part 4 surrounds a region to be measured where the brightness of the liquid crystal panel is measured. Therefore, the buffer part 41 provided at the tip of the light shielding part 4 is made softer (easy to disperse force) than the buffer part 31 provided at the tip of the support part 3 or is formed thicker so that the buffer part 41 is formed. The pressure acting on the liquid crystal panel LP from 41 can be reduced.

  Alternatively, the length of the light shielding portion 4 may be shorter than that of the support portion 3, and the buffer portion 41 may come into contact with the liquid crystal panel LP when the buffer portion 31 is deformed to some extent. By forming in this way, the pressure acting on the liquid crystal panel LP from the buffer portion 41 when the buffer portion 41 is in close contact with the liquid crystal panel LP can be reduced. In addition, the pressure acting on the liquid crystal panel LP from the buffer unit 31 is increased, but since it is away from the measurement target position, it is difficult to exert an influence on the luminance due to the pressure, and it is possible to suppress a decrease in luminance measurement accuracy. .

  For the pressing of the optical property measuring apparatus A to the liquid crystal panel LP, a conventionally well-known method is used. In other words, the optical characteristic measuring device A is caused by its own weight, the belt having elasticity is used to rub against the liquid crystal panel LP, and the belt is pressed by the elastic force of the belt, and the optical property measuring device A fixed using a jig is used as the liquid crystal panel. Methods that can be pressed against the liquid crystal panel LP with a predetermined force, such as those that are pressed against the LP, can be widely adopted.

  The influence of external ambient light on the light receiving element when the optical characteristic measuring apparatus A is attached to the liquid crystal panel LP will be described with reference to the drawings. FIG. 5 is a plan view showing an incident state of ambient light from the outside in a state where the optical characteristic measuring apparatus is used.

  As shown in FIG. 4, the ambient light is incident on the gap between the back surface portion 10 of the main body 1 and the liquid crystal panel LP. Most of the ambient light does not reach the light receiving element 2 because it is blocked by the outer surface of the liquid crystal panel LP and blocked by the light blocking portion 4 as indicated by the optical path O1.

  On the other hand, as indicated by the optical path O <b> 2, ambient light may enter the through hole 42 of the light shielding unit 4. However, as shown in FIG. 4, the through-hole 42 of the light shielding portion 4 is a position where the incident light does not reach the surface of the light receiving element 2 and / or the liquid crystal panel LP even when external light is incident. And formed in a shape. As a result, it is possible to prevent the ambient light from directly entering the light receiving element 2 and / or the liquid crystal panel LP and reducing the measurement accuracy of the light receiving element 2.

  Further, in order to prevent light that has passed through the through hole 42 from being repeatedly reflected by the inner wall portion of the light shielding portion 4 and reaching the surface of the light receiving element 2 and / or the liquid crystal panel LP, at least the inner wall surface of the light shielding portion 4. Is formed so that light is not reflected (is less likely to be reflected) or is absorbed. As a method for preventing light reflection or absorbing light, a method in which the inner wall surface of the light shielding portion 4 is formed of a black resin can be used. The entire light shielding portion 4 may be formed of a black resin, or a sheet-like black resin may be attached to the inner wall surface, or a black resin may be applied.

  On the other hand, when light is incident on a portion facing the light receiving element 2 of the liquid crystal panel LP as in the optical path O3, the light is diffusely reflected at the boundary between the optical film layer or the glass layer and the optical film layer of the liquid crystal panel LP. Some of the light incident at O3 may reach the light receiving element 2. As the angle θ of the optical path O3 with respect to the surface of the liquid crystal panel LP increases, the amount of light incident on the light receiving element 2 increases. Therefore, an auxiliary light shielding unit may be provided in order to prevent the incidence of light from the side where the angle θ increases.

  Another example of the optical property measuring apparatus according to the present invention will be described with reference to the drawings. FIG. 5 is a perspective view of another example of the present invention viewed from the back side. An optical property measuring apparatus B shown in FIG. 5 is provided with a light shielding wall portion 5 as an auxiliary light shielding portion in the optical property measuring apparatus A shown in FIG. The other parts have the same configuration as the optical characteristic measuring apparatus A, and substantially the same parts are denoted by the same reference numerals.

  As shown in FIG. 5, in the optical property measuring apparatus B, the distance between the end of the bottom 10 and the opening 11 is shorter in the left-right direction than in the up-down direction when attached to the liquid crystal panel LP. Therefore, the angle of the external light incident along the optical path O3 from the left and right direction with respect to the liquid crystal panel LP becomes larger than that in the up and down direction and easily reaches the light receiving element 2. Therefore, in the optical characteristic measuring apparatus B, the light shielding wall 5 is disposed so as to cover the left and right side portions of the light shielding portion 4.

  The light shielding wall portion 5 is a member that protrudes in the same direction as the support portion 3 from the side end portion of the back surface portion 10. The length of the light shielding wall 5 in the protruding direction is shorter than the length of the support 3. Further, when the optical characteristic measuring device B is pressed against the liquid crystal panel LP and measures the luminance of the liquid crystal panel LP (in other words, the buffer portion 31 of the support portion 3 is pressed against the liquid crystal panel LP with a predetermined force. The light shielding wall 5 has a length that is close to or in contact with the surface of the liquid crystal panel LP. Thereby, when the optical characteristic measuring apparatus B is pressed against the liquid crystal panel LP, it is possible to suppress the incidence of light from the left and right sides. Further, when the optical characteristic measuring device B is pressed, the light shielding wall 5 is close to or in contact with the liquid crystal panel LP, so that the surface of the liquid crystal panel LP can be prevented from being damaged.

  The liquid crystal panel LP has a property that its optical characteristics change with temperature changes. In many cases, a liquid crystal display device using the liquid crystal panel LP as a display unit includes a backlight, and heat from the backlight is also transmitted to the liquid crystal panel LP. Since the heat transferred to the liquid crystal panel LP in the normal use state of the liquid crystal display device is released to the outside from the surface of the liquid crystal panel LP, the temperature rise on the surface of the liquid crystal panel LP is suppressed. However, when the optical characteristics of the liquid crystal panel LP are measured by the optical characteristic measuring device, the light shielding part 4 is in close contact with the liquid crystal panel LP and the main body part 1 is also close to the surface, so that it is difficult for heat to escape from the surface of the liquid crystal panel LP. It has become.

  Accordingly, heat transfer on the surface of the liquid crystal panel LP in a state where the luminance of the liquid crystal panel LP is measured using the optical characteristic measuring apparatus B according to the present invention will be described with reference to the drawings. FIG. 6 is a side view showing heat input and output in a state where the brightness of the liquid crystal panel is measured by the optical characteristic measuring apparatus shown in FIG. FIG. 6 shows the heat input and output in the measurement state using arrows. In the example shown in FIG. 6, the optical property measuring apparatus B is used, but the same heat enters and exits in the optical property measuring apparatus A shown in FIG. 3.

  Heat from the liquid crystal panel LP is released from the surface into the air. As shown in FIG. 6, when the optical characteristic measuring device B is attached to the liquid crystal panel LP, a part of the heat Ta emitted from the surface of the liquid crystal panel LP is released into the space Z inside the light shielding portion 4. Then, the remaining heat Tb (most of the heat from the liquid crystal panel LP) is released to the unwrapped space Y.

  The heat Ta is released from the surface of the liquid crystal panel LP to the space Z, and the heat Ta is released to the space Z inside the light shielding portion 4, so that the temperature of the air inside the space Z inside the light shielding portion 4 Rises.

  Further, due to the temperature rise of the air inside the space Z, heat Td is transmitted from the space Z to the surface portion X surrounded by the buffer portion 41 of the light shielding portion 4 on the surface of the liquid crystal panel LP. Part of the heat Td is diffused in the creeping direction of the liquid crystal panel LP.

  Between the optical characteristic measuring apparatus B and the surface of the liquid crystal panel LP, the air is warmed by the heat released from the liquid crystal panel LP, and an upward air flow Fc is generated. Since the heat Tb is carried by the rising air flow Fc, the temperature rise of the liquid crystal panel LP is not easily affected by the heat Tb. Further, through holes 42 are formed above and below the light shielding portion 4, and the ascending airflow Fc passes through the inside of the space Z through the through holes 42, so that the air inside the space Z is replaced, and the space Z It is possible to release heat to the outside.

  The light shielding wall 25 is arranged on both the left and right sides of the optical property measuring device B and extends vertically when the optical property measuring device B is attached to the liquid crystal panel LP. It is difficult to affect and it is difficult to affect the temperature rise of the liquid crystal panel LP.

  Further, part of the heat Tb released from the liquid crystal panel LP is absorbed by the back surface portion 10 of the main body 1, the temperature of the back surface portion 10 rises, and the air in the space Y sandwiched between the back surface portion 10 and the liquid crystal panel LP. Temperature rises. Further, a part of the heat Tf radiated from the liquid crystal panel LP to the back surface portion 10 is reflected and returned to the liquid crystal panel LP, and the surface temperature of the liquid crystal panel LP is increased.

  When the luminance of the liquid crystal panel LP is measured by the optical characteristic measuring apparatus B, the above-described heat movement can be considered. In order to suppress the influence of the heat of the liquid crystal panel LP on the luminance, it is necessary to suppress an increase in the surface temperature of the surface portion X surrounded by the light shielding portion 4 of the liquid crystal panel LP due to the installation of the optical characteristic measuring device B. .

  In order to lower the surface temperature of the liquid crystal panel LP, the temperature of the air in the space Z may be lowered. In order to suppress the temperature rise of the air inside the space Z, the amount of heat Ta can be reduced and the amount of air in the space Z can be increased. The thermal Ta increases in proportion to the area of the surface portion X, and the amount of the thermal Ta transmitted to the air in the space Z can be reduced by reducing the area of the surface portion X. Further, the volume of the space Z can be increased by increasing the length of the light-shielding portion 4, that is, by increasing the distance L between the back surface portion 10 and the liquid crystal panel LP, and is transmitted to the air in the space Z. It is possible to reduce the amount of heat per volume of the heat Ta that is produced, and to reduce the temperature rise. Furthermore, by increasing the cross-sectional area of the through-hole 42 of the light shielding portion 4, the flow rate of the ascending airflow Fc passing through the space Z increases, so that the temperature rise of the air inside the space Z can be suppressed.

  In addition, by increasing the length of the light shielding part 4, the area to which the rising air flow Fc is blown can be increased, and a lot of heat is released from the outer surface of the light shielding part 4. Thereby, since the heat of the air in the space Z is also released outside, it is possible to suppress the temperature rise of the air in the space Z. In addition, by increasing the length of the light-shielding portion 4, it becomes difficult for light incident from the through hole 42 to reach the surface of the light receiving element 2 and / or the liquid crystal panel LP, and the measurement accuracy can be increased.

  In order to reduce the heat Tf reflected by the back surface portion 10, a member that hardly reflects heat may be attached to the back surface portion 10. Reflection of the heat Tf radiated to the back surface portion 10 can be suppressed, and an increase in the surface temperature of the liquid crystal panel LP can be suppressed. In addition, as a member affixed on the back surface part 10, it is preferable that it is a member which is hard to reflect heat and is hard to dissipate heat. As a member affixed to the back surface part 10, the sheet | seat formed with the black resin material and the heat-radiation sheet which heat | fever absorbs easily and is easy to move to another member are also used.

A specific example of the optical property measuring apparatus according to the present invention will be described based on experimental data.
(Experiment 1)
The temperature change on the surface of the liquid crystal panel when using the optical property measuring apparatus according to the present invention was compared with that when using the conventional optical property measuring apparatus. In the experiment, an experimental sample E1, which is an optical characteristic measuring apparatus B including a light shielding part 4 in which a through hole is not formed, and an experiment that is an optical characteristic measuring apparatus B including a light shielding part 4 in which a through hole 42 is formed. An experiment was performed using Sample E2. Further, as a comparative sample V1, a light shielding portion 93 is formed so as to surround the outer peripheral portion of the back surface portion 910, and the surface of the measured portion of the liquid crystal panel is covered with the back surface portion 910 and the light shielding portion 93 of the main body 91. Experiments were performed using the characteristic measuring device E (see FIGS. 12 and 13). Note that the distance L between the liquid crystal panel and the back surface portion is 30 mm, and the light-shielding portion 4 of the optical property measuring apparatus B is a cylindrical member having an outer diameter of 20 mm and an inner diameter of 15 mm.

  In the experiment using the experimental sample E1, the liquid crystal panel surface temperature increased by 2 ° C., and the luminance change rate was 2.5%. Further, in the experiment using the experimental sample E2, the liquid crystal panel surface temperature increased by 1.7 ° C., and the luminance change rate was 2.2%. On the other hand, the liquid crystal panel surface temperature increased by 7 ° C. when the conventional optical property measuring apparatus E was used, and the luminance change rate was 8%. Usually, the accuracy of an optical property measuring device that measures the optical properties of the display part of a liquid crystal display device is often around 2% in terms of the rate of change in luminance. When using a conventional optical property measuring device, the measurement accuracy is greatly increased. It turns out that it falls. On the other hand, it can be seen that by using the experimental sample E1, the optical characteristics of the liquid crystal panel can be measured without suppressing a temperature change and greatly reducing the measurement accuracy. When the experimental sample E2 in which the through hole 42 is formed is used, the temperature rise can be further suppressed as compared with the case where the experimental sample E1 is used, and the optical characteristics of the liquid crystal panel can be measured with high accuracy. is there.

(Experiment 2)
When the luminance of the liquid crystal panel LP is measured using the optical characteristic measuring apparatus B according to the present invention, it is understood that the surface temperature of the liquid crystal panel LP changes depending on the distance between the liquid crystal panel LP and the back surface portion 10 of the main body 1. Yes. Therefore, in Experiment 2, the experiment was performed using five patterns in which the distance between the back surface portion 10 and the liquid crystal panel LP was 5 mm, 10 mm, 15 mm, 20 mm, and 30 mm. In this experiment, since the relationship between the distance between the back surface 10 and the surface of the liquid crystal panel LP and the surface temperature of the liquid crystal panel LP is examined, the experiment was performed without the light shielding portion 4 attached.

  FIG. 7 is a graph showing the relationship between the distance between the liquid crystal panel and the back surface and the temperature change. In the graph shown in FIG. 7, the horizontal axis represents the distance (mm) between the liquid crystal panel and the back surface, and the vertical axis represents the temperature change (° C.) of the liquid crystal panel. The temperature change is a difference between the surface temperature of the liquid crystal panel in a state where the optical characteristic measuring device is not pressed and the temperature when the optical characteristic measuring device is pressed.

  As shown in FIG. 7, as the distance between the liquid crystal panel LP and the back surface portion 10 increases, the temperature change of the measured portion becomes smaller. That is, the change in temperature when the distance between the liquid crystal panel LP and the back surface portion 10 was 5 mm was 4.1 ° C., whereas 1.5 ° C. for 10 mm, 1.3 ° C. for 15 mm, and 1 ° C. for 20 mm. , It can be seen that it decreased to 0.9 ° C. at 30 mm. It can also be seen that the temperature change suddenly changes from 5 mm to 15 mm, whereas the temperature change is small at 15 mm. Therefore, in the optical characteristic measuring apparatus B according to the present invention, when pressed against the liquid crystal panel LP, the distance between the surface of the liquid crystal panel LP and the back portion 10 of the main body 1 is 15 mm or more, It was found that temperature change can be suppressed and deterioration of measurement accuracy can be reduced.

  Another example of the optical property measuring apparatus according to the present invention will be described with reference to the drawings. FIG. 8 is a perspective view of another example of the optical property measuring apparatus according to the present invention, and FIG. 9 is a cross-sectional view of the measurement unit of the optical property measuring apparatus shown in FIG. The optical characteristic measuring apparatus shown in FIG. 8 can be separated into a measuring instrument 6 and a measuring unit 7. The measurement unit 7 is a member that is connected to the back surface portion of the measurement device 6 to keep the distance between the measurement device 6 and the surface of the liquid crystal panel LP constant, and includes a support portion 73, a light shielding portion 74, and a light shielding wall portion 75. It has. The support part 73, the light-shielding part 74, and the light-shielding wall part 75 have the same configuration as the support part 3, the light-shielding part 4, and the light-shielding wall part 5 shown in FIG. The light shielding portion 74 is formed with a through hole 742 as in the light shielding portion 4.

  As shown in FIG. 9, the bottom surface portion 711 of the measurement unit 7 is formed in a plane so as to be in contact with the bottom surface of the measuring device 6, and the inner cylinder portion of the light shielding portion 74 is connected to the light receiving element of the measuring device 6 and the light. Is provided with a connecting portion 712 that can be connected so that the light does not enter. As described above, since the measuring device 6 and the measuring unit 7 can be separated, a plurality of measuring devices 6 capable of measuring different optical characteristic values can be replaced and used.

  Further, by producing the measurement unit 7 so that it can be engaged with the back surface of the optical property measuring device that has been conventionally used, the conventional optical property measuring device is affected by the temperature similarly to the optical property measuring device of the present invention. The optical characteristics of the liquid crystal panel can be measured without being affected.

  Another example of the optical property measuring apparatus according to the present invention will be described with reference to the drawings. FIG. 10 is an enlarged cross-sectional view of a light shielding part of another example of the optical characteristic measuring apparatus according to the present invention. The optical characteristic measuring apparatus C shown in FIG. 10 has the same configuration as the optical characteristic measuring apparatus B except that the light shielding portion 8 is different, and substantially the same parts are denoted by the same reference numerals. In the through hole 82 of the light shielding unit 8 of the optical characteristic measuring device C, a plurality of fins 83 are arranged side by side from the back surface unit 10 to the liquid crystal panel LP. The fin 83 is a flat member. By attaching the fins 83, light incident obliquely into the through holes 82 is blocked by the fins 83, so that even if the size of the through holes 82 is increased, the light reaches the light receiving element 2 and / or the liquid crystal panel LP. do not do. Further, since the fin 83 is formed of a thin member, the opening area of the through hole 82 can be widened, and the cooling effect inside the light shielding portion 8 can be enhanced accordingly.

  As shown in FIG. 10, among the plurality of fins 83, the fins 831 close to the back surface 10 side may be arranged so as to move away from the back surface side toward the inside of the light shielding unit 8. By arranging in this way, it is possible to increase the area for blocking incident light that is inclined toward the light receiving element 2, and thus the number of fins can be reduced. Similarly, the fins 832 on the liquid crystal panel LP side may be attached so as to be away from the liquid crystal panel LP inward. Further, by forming the fin 83 with a material that hardly reflects light or absorbs light, it is possible to effectively suppress the light from entering the light receiving element 2 and / or the liquid crystal panel LP. .

  In each of the above-described embodiments, the description has been given of the case where the four support portions are provided. However, the present invention is not limited to this, and it is only necessary to provide the number of support portions that can stabilize the main body. Moreover, you may utilize a part or whole of the light-shielding wall part as a support part. At this time, it is preferable that a buffer portion is formed in a portion of the light shielding wall portion that contacts the liquid crystal panel. Further, the light shielding portion may be used as one of the support portions.

  Another example of the optical property measuring apparatus according to the present invention will be described with reference to the drawings. FIG. 11 is a side view of another example of the optical property measuring apparatus according to the present invention. As shown in FIG. 11, the optical characteristic measuring device D includes a main body 1d and a light shielding part 4d. In the optical characteristic measuring device D, the light shielding part 4d is used as a support part. Thus, by sharing the support part and the light-shielding part, the structure can be simplified, and it is possible to save labor and time for manufacturing. The light shielding part 4d is formed with a buffer part 41d and a through hole 42d. The through hole 42d is formed on the light receiving element 2 where the incident light is arranged directly on the surface of the liquid crystal panel LP or at the back of the opening part 11d. Needless to say, it is formed so as not to be incident.

  In each of the above embodiments, the cylindrical light shielding portion is described as an example. However, the light shielding portion is not limited to this, and a shape that can prevent light from entering the opening is widely adopted. It is possible.

  In the optical characteristic measuring apparatus of the above embodiment, the measurement of the optical characteristic of the liquid crystal panel of the liquid crystal display device using a liquid crystal panel as the display unit is described as an example, but the invention is not limited thereto, and the optical characteristic changes due to heat. The optical characteristics of the display unit of the display device including the display unit that can be easily measured can be measured while suppressing the influence of heat.

  In the above-described embodiment, the luminance is described as an example of the index of the optical characteristic to be measured. However, the index is not limited thereto, and an index indicating the display performance of the display unit (for example, luminance, contrast, gradation, etc.) Alternatively, a plurality of them may be measured.

  The above description of the embodiment is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. It is needless to say that each part configuration of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

  The optical property measuring apparatus of the present invention can be applied to use for measuring optical properties while reducing the influence on the optical properties due to heat when measuring the optical properties of a display unit having self-heating or a nearby heat source. .

It is a schematic side view of the state currently measured with the optical characteristic measuring apparatus concerning this invention. It is a rear view of the optical characteristic measuring apparatus shown in FIG. It is the perspective view seen from the back side of the optical characteristic measuring apparatus shown in FIG. It is a top view which shows the incident state of the ambient light from the outside in the state using an optical characteristic measuring apparatus. It is the perspective view seen from the back side of the other example concerning this invention. FIG. 6 is a side view showing heat input and output in a state where the luminance of the liquid crystal panel is measured by the optical characteristic measuring apparatus shown in FIG. 5. It is a graph which shows the relationship between the distance of a liquid crystal panel and a back surface part, and a temperature change. It is a perspective view of the other example of the optical characteristic measuring apparatus concerning this invention. It is sectional drawing of the measurement unit of the optical characteristic measuring apparatus shown in FIG. It is an expanded sectional view of the light-shielding part of the other example of the optical characteristic measuring apparatus concerning this invention. It is a side view of the other example of the optical characteristic measuring apparatus concerning this invention. It is a side view of the conventional optical characteristic measuring apparatus. It is a rear view of the optical characteristic measuring apparatus shown in FIG.

Explanation of symbols

A, B Optical characteristic measuring apparatus 1 Main body 10 Back surface portion 11 Opening portion 2 Light receiving element 3 Supporting portion 31 Buffer portion 4 Light shielding portion 41 Buffer portion 42 Through hole 5 Light shielding wall portion

Claims (12)

An optical property measuring device for measuring an optical property of a display unit of a display device,
A main body having a planar back surface disposed opposite to the display;
An optical sensor that receives light incident from an opening formed in the back surface; and
A support portion disposed on the back surface portion for maintaining a constant distance between the display portion and the back surface portion;
It is arranged so as to surround the edge part of the opening part of the back part, and is provided with a light shielding part that is in close contact with the surface of the display part when measuring the optical characteristics,
An optical characteristic measuring apparatus, wherein a through hole is formed in a side wall portion of the light shielding portion at a position where light is not irradiated on the surfaces of the optical sensor and the display portion.   The optical characteristic measuring apparatus according to claim 1, wherein the light shielding part is formed so that at least an inner surface of the side wall part hardly reflects or absorbs light. The measurement of the optical characteristics is performed in a state where the display unit is upright,
The optical characteristic measuring apparatus according to claim 1, wherein the through-hole is formed at least in an upper part and a lower part of the light shielding part when performing the optical measurement.   The optical characteristic measuring device according to any one of claims 1 to 3, wherein a plurality of fins are arranged in a length direction of the light shielding portion in the through hole.   The optical characteristic measuring apparatus according to claim 4, wherein at least some of the plurality of fins are formed in parallel with the back surface portion.   6. The optical device according to claim 4, wherein the fin disposed on the side close to the back surface portion is inclined so as to be away from the back surface portion from the outer wall side to the inner wall side of the light shielding portion. Characteristic measuring device.   The fin disposed on the side close to the display unit is disposed so as to be inclined so as to approach the back surface unit from the outer wall side to the inner wall side of the light shielding unit. The optical characteristic measuring apparatus as described.   The back surface portion includes a light shielding wall portion that is disposed at at least one of right and left ends when the optical property is measured, and blocks light passing between the back surface portion and the display portion. The optical property measuring apparatus according to claim 1.   The optical characteristic measuring apparatus according to claim 8, wherein the light shielding wall part is not in contact with the display part when the optical characteristic is measured.   The optical characteristic according to any one of claims 3 to 9, wherein the support part is formed so that a distance between the back part and the display part when the optical characteristic is measured is 15 mm or more. measuring device.   The optical characteristic measuring apparatus according to claim 1, wherein the display unit is a liquid crystal panel.   The optical characteristic measuring apparatus according to claim 1, wherein at least a part of the support part also serves as the light shielding part.

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