Contrast measuring equipment for transmission type liquid crystal light valve chip

Abstract

The utility model relates to contrast measuring equipment for a transmission-type liquid crystal light valve chip, which comprises a laser, an adjustable polarizer, a PBS (polarization beam splitter), a reflection silicon wafer, an electric measuring machine, a to-be-measured transmission-type liquid crystal light valve chip and an illuminometer. The PBS polarizing beam splitter reflects an incident laser beam to the reflection silicon wafer, the reflection silicon wafer reflects the laser beam to the transmission-type liquid crystal light valve chip to be detected, an electrode of the electric measuring machine is connected with circuits of a COM end and an SEG PAD end of the transmission-type liquid crystal light valve chip, and after the transmission-type liquid crystal light valve chip to be detected receives the laser beam, the COM end and the SEG PAD end of the transmission-type liquid crystal light valve chip to be detected are connected with the COM end. And the transmitted light source is irradiated on a probe of the illuminometer through the PBS polarizing beam splitter. Therefore, corresponding brightness values and black state values can be read on the illuminometer, and contrast parameters can be obtained according to the brightness values and the black state values. The measuring equipment is low in cost, simple and convenient to operate and high in measuring efficiency, and the measured contrast parameters are high in accuracy.

Description

Technical Field

[0001] The utility model relates to the field of liquid crystal light valve chips, in particular to a transmission type liquid crystal light valve chip contrast measurement device. Background Art

[0002] In the field of liquid crystal display technology, transmissive liquid crystal light valve products (LCD panels for short) are core components for information display. Their performance parameters, such as brightness, black state (i.e., the brightness at the lowest brightness or contrast ratio of 1), and contrast, directly determine the quality of the display effect and the breadth of application scenarios.

[0003] Brightness is a key indicator of the luminous intensity of an LCD panel, directly impacting picture brightness and visual experience. Black state refers to light leakage when the LCD panel is off. Contrast, the ratio of brightness between the brightest and darkest states, is a key parameter for measuring image clarity and color gradation in an LCD panel. Traditional measurement techniques, due to inaccuracies in brightness and black state measurements, lead to significant errors in contrast calculations, making it difficult to truly reflect the actual display quality of the LCD panel.

[0004] Therefore, there is an urgent need to provide a transmissive liquid crystal light valve chip contrast measurement device to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and defects of the existing technology and provide a transmissive liquid crystal light valve chip contrast measurement device, which measures the brightness value and black state value of the transmissive liquid crystal light valve chip to obtain the contrast parameter.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A transmissive liquid crystal light valve chip contrast measurement device includes a laser, an adjustable polarizer, a PBS polarization beam splitter, a reflective silicon wafer, an electrical measuring machine, a transmissive liquid crystal light valve chip to be measured, and an illuminometer. The laser and the PBS polarization beam splitter are arranged opposite each other, the adjustable polarizer is located between the laser and the PBS polarization beam splitter, a laser beam emitted by the laser passes through the adjustable polarizer and directly irradiates the PBS polarization beam splitter, the reflective silicon wafer is located in the reflection direction of the PBS polarization beam splitter, the PBS polarization beam splitter reflects the incident laser beam onto the reflective silicon wafer, the transmissive liquid crystal light valve chip to be measured is located in the reflection direction of the reflective silicon wafer, the reflective silicon wafer reflects the laser beam to the transmissive liquid crystal light valve chip to be measured, the electrodes of the electrical measuring machine are respectively connected to the circuits at the COM terminal and the SEG PAD terminal of the transmissive liquid crystal light valve chip, and after the transmissive liquid crystal light valve chip to be measured receives the laser beam, the transmitted light source is irradiated onto a probe of the illuminometer through the PBS polarization beam splitter.

[0008] As a preferred technical solution of the present invention, an adjustable diaphragm is provided between the PBS polarization beam splitter and the illuminometer.

[0009] As an optimal technical solution of the utility model, it also includes a carrying platform, the measuring equipment is located on the carrying platform, and the carrying platform is also provided with a bracket for fixing the laser, adjustable polarizer, PBS polarization splitter, reflective silicon wafer, electric measuring machine, transmissive liquid crystal light valve chip to be measured, illuminometer and adjustable aperture.

[0010] As a preferred technical solution of the present utility model, the measuring device also includes an adjustment hole plate, which is adjustably connected to the bracket, and the adjustment hole plate is used to adjust the relative positions of the laser, adjustable polarizer, PBS polarization beam splitter, reflective silicon wafer, electric measuring machine, transmissive liquid crystal light valve chip to be measured, illuminometer, and adjustable aperture on the bracket.

[0011] As a preferred technical solution of the present invention, the model of the illuminometer is CL-200A.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This utility model precisely controls the polarization state of a laser beam, transmits the laser beam to a transmissive liquid crystal light valve chip using a PBS polarizing beam splitter and a reflective silicon wafer, and applies alternating current of a specific frequency to the transmissive liquid crystal light valve chip via an electric measuring machine. The periodically varying light source transmitted by the transmissive liquid crystal light valve chip illuminates the probe of an illuminometer through the PBS polarizing beam splitter, enabling accurate measurement of the brightness, black state, and contrast parameters of the transmissive liquid crystal light valve chip on the illuminometer. This measurement device offers low cost, ease of operation, high measurement efficiency, and highly accurate contrast parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] The above drawings include the following reference numerals:

[0016] 1. Laser, 2. Adjustable polarizer, 3. PBS polarizing beam splitter, 4. Reflective silicon wafer, 5. Electrode for measuring machine, 6. Transmissive liquid crystal light valve chip to be measured, 7. Adjustable aperture, 8. Illuminance meter. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0018] The specific implementation process of this utility model is as follows:

[0019] like Figure 1 As shown, a transmissive liquid crystal light valve chip contrast measurement device calculates contrast parameters based on measured brightness and black state values. The device includes a laser 1, an adjustable polarizer 2, a PBS polarization beam splitter 3, a reflective silicon wafer 4, an electrical measuring machine, a transmissive liquid crystal light valve chip to be measured 6, and an illuminometer 8. The laser 1 is used to emit a laser beam, and the adjustable polarizer 2 is used to control the polarization state of the light. The laser 1 and the PBS polarization beam splitter 3 are positioned opposite each other, with the adjustable polarizer 2 positioned between the laser 1 and the PBS polarization beam splitter 3. The device precisely controls the polarization state of the laser beam. By adjusting and rotating the polarizer, the light direction and brightness are changed, allowing the light source to be adjusted to the darkest or brightest position, accurately measuring brightness and black state values. This ensures that the laser beam emitted by the laser 1 accurately impinges on the PBS polarization beam splitter 3. The PBS polarization beam splitter 3 splits the incident laser beam into a reflection direction and a transmission direction. The reflective silicon wafer 4 is located in the reflection direction of the PBS polarization beam splitter 3. After the laser beam is incident on the PBS polarization beam splitter 3, it is reflected by the reflective silicon wafer 4. The high reflectivity of the reflective silicon wafer 4 ensures that the laser beam is transmitted to the transmissive liquid crystal light valve chip 6 under test. The transmissive liquid crystal light valve chip 6 under test is located in the reflection direction of the reflective silicon wafer 4 and receives the laser beam reflected by the reflective silicon wafer 4. The electro-testing machine electrodes 7 are respectively connected to the circuits at the COM terminal and the SEG PAD terminal of the transmissive liquid crystal light valve chip 6 under test. The positive electrode of the electro-testing machine is clamped to the circuit at the COM terminal of the transmissive liquid crystal light valve chip 6 under test, and the negative electrode of the electro-testing machine is clamped to the circuit at the SEG PAD terminal of the transmissive liquid crystal light valve chip 6 under test, ensuring a stable connection of the measurement circuit. The electro-testing machine can simulate different operating conditions by adjusting the frequency and amplitude of the alternating current, thereby evaluating the performance of the transmissive liquid crystal light valve chip 6 under different conditions. After the transmissive liquid crystal light valve chip 6 under test receives the laser beam, the electrical tester applies alternating current of a specific frequency to the chip, causing the liquid crystal molecules within the chip to undergo periodic changes. This causes the chip to transmit a periodically varying light source. This light source passes through the PBS polarizing beam splitter 3 and is then irradiated onto the probe of an illuminator 8. An adjustable iris 7 is positioned between the PBS polarizing beam splitter 3 and the illuminator 8 to adjust the angle of illumination. Adjusting the adjustable iris 7 allows the light source to accurately illuminate the illuminator 8. The illuminator 8 receives and measures the light transmitted through the transmissive liquid crystal light valve chip 6 under test. This allows the brightness and black state values ​​to be read on the illuminator 8, and the contrast ratio is then derived based on these values.

[0020] In an embodiment of the present invention, the transmissive liquid crystal light valve chip contrast measurement device is provided on a support platform, on which a bracket (not shown) is placed. The bracket is a conventional existing fixed bracket and will not be described in detail here. The specific structure can be designed according to actual use and can be used to fix the device. The bracket is used to fix the laser 1, the adjustable polarizer 2, the PBS polarization beam splitter 3, the reflective silicon wafer 4, the transmissive liquid crystal light valve chip to be measured 6, the illuminometer 8, the electric measuring machine, and the adjustable iris 7, ensuring that all components remain stable during operation and preventing shaking from affecting the measurement results. Furthermore, the measuring device is also provided with an adjustment orifice plate (not shown in the figure), the specific structure of which can be designed according to actual use. The adjustment orifice plate is adjustably connected to the bracket and is used to adjust the relative positions of the laser 1, the adjustable polarizer 2, the PBS polarization beam splitter 3, the reflective silicon wafer 4, the transmissive liquid crystal light valve chip to be measured 6, the illuminometer 8, the electric measuring machine, and the adjustable iris 7 on the bracket. Specifically, the brackets are removably mounted on the adjustment plate with screws. Users can adjust the number of holes between the brackets based on product specifications or actual needs, enabling precise fine-tuning of the position of each component. This measurement device is highly versatile and adaptable, meeting the contrast parameter measurement requirements of transmissive liquid crystal light valve chips 6 of varying sizes, shapes, and structures.

[0021] In the embodiment of the present invention, the illuminometer 8 is a CL-200A illuminometer 8 .

[0022] The operating principle of the present invention is as follows: the laser beam emitted by a laser 1 first undergoes polarization conversion through an adjustable polarizer 2 and then is directed to a PBS polarizing beam splitter 3. The PBS polarizing beam splitter 3 reflects the laser beam onto a reflective silicon wafer 4, which in turn reflects the light source to a transmissive liquid crystal light valve chip 6 to be tested. After receiving the light, the chip is energized by an electric measuring machine, which applies an alternating current of a specific frequency to the transmissive liquid crystal light valve chip 6 to be tested. This causes the chip 6 to transmit a light source with a certain periodic variation. This light source passes through the PBS polarizing beam splitter 3, is adjusted by an adjustable aperture 7, and then directly illuminates the probe of an illuminance meter 8. The corresponding brightness and black state values ​​are then read and displayed on the illuminance meter 8, thereby deriving the contrast parameter based on the measured brightness and black state values.

[0023] The measuring device of the present application can be widely used in the field of measuring the panel brightness, black state and contrast parameters of the transmissive liquid crystal light valve product series. The measuring device is low-cost, easy to operate, and has high measurement efficiency, and the measured contrast parameters are highly accurate.

[0024] The above-described embodiments merely represent implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A transmissive liquid crystal light valve chip contrast measurement device, characterized in that: The invention comprises a laser, an adjustable polarizer, a PBS polarization beam splitter, a reflective silicon wafer, an electric measuring machine, a transmissive liquid crystal light valve chip to be tested, and an illuminometer. The laser and the PBS polarization beam splitter are arranged opposite to each other, the adjustable polarizer is located between the laser and the PBS polarization beam splitter, the laser beam emitted by the laser passes through the adjustable polarizer and is directly irradiated on the PBS polarization beam splitter, the reflective silicon wafer is located in the reflection direction of the PBS polarization beam splitter, the PBS polarization beam splitter reflects the incident laser beam onto the reflective silicon wafer, the transmissive liquid crystal light valve chip to be tested is located in the reflection direction of the reflective silicon wafer, the reflective silicon wafer reflects the laser beam to the transmissive liquid crystal light valve chip to be tested, the electrodes of the electric measuring machine are respectively connected to the circuits of the COM terminal and the SEG PAD terminal of the transmissive liquid crystal light valve chip, after the transmissive liquid crystal light valve chip to be tested receives the laser beam, the transmitted light source is irradiated on the probe of the illuminometer through the PBS polarization beam splitter.

2. The transmissive liquid crystal light valve chip contrast measurement device according to claim 1, characterized in that: An adjustable diaphragm is provided between the PBS polarization beam splitter and the illuminometer.

3. The transmissive liquid crystal light valve chip contrast measurement device according to claim 2, characterized in that: It also includes a supporting platform, the measuring equipment is located on the supporting platform, and the supporting platform is also provided with a bracket for fixing the laser, adjustable polarizer, PBS polarization splitter, reflective silicon wafer, electric measuring machine, transmissive liquid crystal light valve chip to be measured, illuminometer and adjustable aperture.

4. The transmissive liquid crystal light valve chip contrast measurement device according to claim 3, characterized in that: The measuring device also includes an adjustment orifice plate, which is adjustably connected to the bracket and is used to adjust the relative positions of the laser, adjustable polarizer, PBS polarization beam splitter, reflective silicon wafer, electric measuring machine, transmissive liquid crystal light valve chip to be measured, illuminometer, and adjustable aperture on the bracket.

5. The transmissive liquid crystal light valve chip contrast measurement device according to claim 4, characterized in that: The model of the illuminometer is CL-200A.

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