CN110967868A

CN110967868A - Liquid crystal display terminal and eyesight test method

Info

Publication number: CN110967868A
Application number: CN201911196843.2A
Authority: CN
Inventors: 罗飞
Original assignee: Najing Technology Corp Ltd
Current assignee: Najing Technology Corp Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-04-07

Abstract

The invention provides a liquid crystal display terminal and a vision testing method. The liquid crystal display terminal comprises a quantum dot backlight module, the liquid crystal display terminal is used for WORTH four-point visual target testing, and the quantum dot backlight module comprises red quantum dots and green quantum dots. The luminous spectrum of the quantum dot technology can be easily adjusted, so that the matching of the luminous spectrum of the quantum dots and the blocking spectrum of the red-green complementary glasses is realized, namely the luminous spectrum of the red quantum dots can be completely filtered by the green lens, and the luminous spectrum of the green quantum dots can be completely filtered by the red lens, and therefore, the test accuracy can be improved.

Description

Liquid crystal display terminal and eyesight test method

Technical Field

The invention relates to a vision detection device and a vision detection method, in particular to a liquid crystal display terminal and a vision test method using the same.

Background

The existing vision screening work tends to be data, integrated and systematized, test items are often integrated on a comprehensive optometry instrument or a display terminal for vision screening, a liquid crystal display is often used as a carrier of vision test, and in the Worth four-point sighting mark test, a conventional liquid crystal display can show that the left eye of a normal vision examinee can still see a green cross sighting mark, and the right eye can still see the condition of a red diamond sighting mark, so that the test accuracy is influenced.

Disclosure of Invention

The invention mainly aims to provide a liquid crystal display terminal and a method for testing eyesight by using the same, so as to solve the problem of low accuracy of eyesight test in the prior art.

In order to achieve the above object, according to an aspect of the present invention, a liquid crystal display terminal is provided, where the liquid crystal display terminal includes a quantum dot backlight module, the liquid crystal display terminal is used for a worrth four-point sighting mark test, and the quantum dot backlight module includes red quantum dots and green quantum dots.

Furthermore, the peak wavelength of the green quantum dots is between 510nm and 550nm, preferably 520-540nm, and most preferably 527-535 nm.

Furthermore, the peak wavelength of the red quantum dots is 610nm-660nm, preferably 620-640nm, and most preferably 623-632 nm.

Further, the half-peak width of the green quantum dot is within 40nm, preferably within 30nm, and most preferably within 22 nm; the half-width of the red quantum dot is within 40nm, preferably within 30nm, and most preferably within 22 nm.

Furthermore, the quantum dot backlight module comprises a quantum dot film or a quantum dot LED packaging body.

In order to achieve the above object, according to an aspect of the present invention, there is provided a vision testing method, in which a testing device used is a liquid crystal display terminal, the liquid crystal display terminal is any one of the above liquid crystal display terminals, and during testing, the liquid crystal display terminal presents a worrth four-point optotype, and the worrth four-point optotype includes a red optotype, a green optotype and a white optotype.

Furthermore, the method comprises the step of enabling a person to be worn with red-green complementary glasses, wherein the red-green complementary glasses comprise a red lens and a green lens, a flip first optical filter is arranged in front of the red lens, and the first optical filter is used for blocking light in a 600nm-680nm waveband or light passing through a 510nm-550nm waveband.

Further, during testing, a second filter is attached to the screen position corresponding to the green optotype, so that the second filter completely covers the green optotype, but does not cover the white optotype and the red optotype.

Further, the peak wavelength of the green quantum dot is a, and the second filter can pass a wavelength having a deviation value from a within 5%.

Furthermore, the leakage energy density of the liquid crystal display terminal is 0.03W/m²The following.

By applying the technical scheme of the invention, the liquid crystal display terminal is provided, the luminous spectrum of the quantum dot technology can be easily adjusted, so that the matching of the luminous spectrum of the quantum dot and the blocking spectrum of the red-green complementary glasses is realized, namely the luminous spectrum of the red quantum dot can be completely filtered by the green lens, and the luminous spectrum of the green quantum dot can be completely filtered by the red lens, and the test accuracy can be improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a spectrum of natural light after passing through red and green lenses of conventional red-green complementary glasses according to the prior art;

FIG. 2 shows a spectrum diagram of a typical Liquid Crystal Display (LCD) with either all saturated red R (255, 0, 0) or all saturated green G (0, 255, 0) according to the prior art;

FIG. 3 shows a common WORTH four-point visual map;

FIG. 4 illustrates a red green quantum dot spectrum of an embodiment of a liquid crystal terminal shown herein;

FIG. 5 is a graph showing red and green spectra of a liquid crystal terminal passing through a red lens of a conventional red and green complementary glasses according to the present application;

fig. 6 shows a spectrum diagram of red and green light spectrums of a display liquid crystal terminal of the present application after passing through green lenses of conventional red and green complementary glasses.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The liquid crystal display terminal comprises a quantum dot backlight module, the liquid crystal display terminal is used for WORTH four-point visual target testing, and the quantum dot backlight module comprises red quantum dots and green quantum dots. The WORTH four-point visual target pattern can refer to FIG. 3, but is not limited thereto. FIG. 4 is a fluorescence spectrum of red and green quantum dots according to an embodiment of the present application.

When the Worth four-point sighting target is generally checked, a person to be checked wears red-green complementary glasses (a right-eye red lens and a left-eye green lens) and stands at a position 33cm to 6m for testing for multiple times, and because the red-green complementary glasses separate binocular vision, the red sighting target cannot be seen by the left eye and the green sighting target cannot be seen by the right eye. If the subject sees four images to demonstrate that the patient has binocular vision, he may have normal binocular vision and abnormal retinal correspondence with small-angle esotropia. If the subject sees not four but two (red) graphics, it is evident that the left eye is suppressed. Or three patterns (green), that demonstrates that the right eye is suppressed. If the patient sees five figures, it is proved that the patient has an internal or external strabismus and a double vision exists.

The conventional liquid crystal backlight source uses LED white light, the spectrum of the LED white light consists of a blue LED excitation light source and a fluorescent powder excitation peak, the half-peak width is very wide, and the red spectrum and the green spectrum are not separated. The inventor finds through experiments that when the WORTH four-point sighting target is tested, referring to fig. 1, the green lens can effectively filter the spectrums of 380nm-475nm and 560nm-680nm wave bands; the red lens can effectively filter the spectrum of 380nm-583 nm; the red and green monochromatic spectra of a conventional liquid crystal display instrument are shown in figure 2, so that when the WORTH four-point sighting mark is tested, red light with a band of 680nm-780nm of a red round sighting mark can be seen by a green lens, and can not be filtered completely; the red lens can see green cross-shaped visual marks, and green light with the wave band of 583nm-630nm cannot be filtered out completely. Resulting in a decrease in the accuracy of the vision test. The quantum dot backlight module consists of a blue LED excitation light source and red and green quantum dot excitation peaks, has narrow half-peak width, and has separated red and green spectrums and good color purity. The luminous spectrum of the quantum dot technology can be easily adjusted, so that the matching of the luminous spectrum of the quantum dots and the blocking spectrum of the red-green complementary glasses is realized, namely the luminous spectrum of the red quantum dots can be completely filtered by the green lens, and the luminous spectrum of the green quantum dots can be completely filtered by the red lens, and therefore, the test accuracy can be improved.

In some embodiments, the peak wavelength of the green quantum dots is between 510nm and 550nm, preferably 520-540nm, and most preferably 527-535 nm. The peak wavelength of the green quantum dots can be selected in conjunction with the filter band of the red lens.

In some embodiments, the peak wavelength of the red quantum dots is between 610nm and 660nm, preferably 620-640nm, and most preferably 623-632 nm. The peak wavelength of the red quantum dots can be selected in conjunction with the filter band of the green lens.

In some embodiments, the green quantum dots have a half-peak width within 40nm, preferably within 30nm, and most preferably within 22 nm; the half-peak width of the red quantum dots is within 40nm, preferably within 30nm, and most preferably within 22 nm. Thereby ensuring the color gamut and color accuracy of the liquid crystal display terminal.

In some embodiments, the quantum dot backlight module includes a quantum dot film or a quantum dot LED package. The product form of the quantum dots in the quantum dot backlight module can also be other forms.

According to another aspect of the application, a method for performing vision test by using any one of the liquid crystal display terminals is provided, wherein the liquid crystal display terminal presents a WORTH four-point visual target during the test, and the WORTH four-point visual target comprises a red visual target, a green visual target and a white visual target.

The module in the liquid crystal display equipment contains a color filter which has the function of filtering and dividing a white light backlight source into three primary colors of red, green and blue, but the inventor finds that a light leakage phenomenon can occur because the color filter can not completely convert the backlight into pure three-channel primary light, and the light leakage phenomenon of the quantum dot backlight module is improved because the color purity of the quantum dot backlight module is good, but the quantum dot backlight module still has obvious light leakage in a red light wave band of 600nm-680nm and can also influence the accuracy of the test. The following embodiments are typical solutions and different solutions may be used in combination.

In some embodiments, the method includes wearing red-green complementary glasses on the subject, where the red-green complementary glasses include a red lens and a green lens, and a flip-open first filter is disposed in front of the red lens, and the first filter is used to block light in a 600nm-680nm band or light in a 510nm-550nm band that passes through the first filter. In some embodiments, the first filter is used to block the 580nm-780nm band, thereby filtering out more of the leaked light. It should be noted that the red lens is used for filtering the red wavelength band, and the green lens is used for filtering the green wavelength band, for example, the green lens can block the light in the 475nm-560nm band or the 560-680nm band.

In some embodiments, the first filter is detachable from the red-green complementary glasses after the test is finished.

In some embodiments, the first filter can pass light from B nm to C nm, wherein the peak wavelength of the red quantum dots is A, and the difference between B, C and A is within 10 nm. In some preferred embodiments, the difference between each of B, C and A is within 5 nm. In some more preferred embodiments, the difference between each of said B, said C and said a is within 1 nm. In some embodiments, B is 560nm and C is 680 nm.

In some embodiments, during testing, a second filter is attached to the screen corresponding to the green optotype, so that the second filter completely covers the green optotype, but does not cover the white optotype and the red optotype. In some embodiments, the second filter passes through 510-550nm, or the second filter blocks 580-780 nm. In some embodiments, the second filter further includes a non-functional (non-transmissive or blocking specific wavelength band) region, and the non-functional region does not cover the green optotype. In some embodiments, the second filter has a rectangular shape.

In some embodiments, the second filter is detachable from the screen after testing.

In some embodiments, the peak wavelength of the green quantum dots is a, and the second filter can pass wavelengths within 5% of a deviation value from a.

In some embodiments, the liquid crystal display terminal has a light leakage energy density of 0.03W/m²The following. The energy of the leaked light can be measured by a spectrum tester, and the ordinate of the spectrum is the energy density of the leaked light.

Example 1

And searching 10 test objects between 22 and 30 years old, wherein the 2 test subject is color blindness, the 6 test subject has image fusion defect in both eyes, and the others are normal vision (the vision is more than 1.0). The testee stands at a position 5.0m away from the liquid crystal display terminal carrying the quantum dot diaphragm and is required to be over against the liquid crystal display terminal of the WORTH four-point sighting mark, and the four-point sighting mark is respectively two green light crosses, a white light sphere and a red light rhombus. The red emission peak of the quantum dot liquid crystal display terminal is 625nm (the fluorescence spectrum of the red quantum dot is a dotted line), the half-peak width is 20nm, the green emission peak is 532nm (the fluorescence spectrum of the green quantum dot is a solid line), and the half-peak width is 21nm, which is shown in the spectrogram of fig. 4. The spectrogram of the quantum dot red-green spectrum of the quantum dot liquid crystal display terminal after passing through the red lens is shown in fig. 5, wherein a solid line is the spectrum of the quantum dot red spectrum after passing through the red lens, and a dotted line is the spectrum of the quantum dot green spectrum after passing through the red lens. The spectrogram of the quantum dot red-green spectrum of the quantum dot liquid crystal display terminal after passing through the green lens is shown in fig. 6, wherein the solid line is the spectrum of the quantum dot green spectrum after passing through the green lens, and the dotted line is the spectrum of the quantum dot red spectrum after passing through the green lens. As can be understood from comparison among fig. 5, fig. 6 and fig. 2, stray light of the quantum dot liquid crystal display terminal after passing through the red and green lenses is significantly reduced, so that influence of the stray light on judgment of a testee is reduced. The testee is required to wear the red and green complementary glasses after improvement, and a first flip-cover optical filter for blocking 600nm-680nm is arranged in front of the red glasses. The testee is required to put down the flip first filter, the test blocks the green lens (left eye) to observe the sighting mark, blocks the red lens (right eye) to observe the sighting mark, the test condition that the sighting mark is observed by two eyes is tested, and the test result stated by the supervisor of 10 testees is recorded.

TABLE 1

It shows that the number 6 testees have red-green-blind eyes, the number 2 testees have inhibited left eyes, and the number 8 testees have inhibited right eyes.

Example 2

In example 1, 10 subjects were tested, and the subjects stood 5.0m from the liquid crystal display terminal on which the quantum dot film was mounted, and were required to face the liquid crystal display terminal of the WORTH four-point optotype. The same quantum dot liquid crystal display terminal as in example 1 was used, and a second filter having a passage wavelength of 522nm to 542nm was attached to the screen corresponding to the green cross optotype. The test subject is required to wear conventional red-green complementary glasses. The testees are respectively required to block the green lens (left eye) to observe the visual target, block the red lens (right eye) to observe the visual target, test the condition that the visual target is observed by two eyes, and record the test results of 10 testees, wherein the results are consistent with the results in the table 1.

Example 3

In example 1, 10 subjects were tested, and the subjects stood 5.0m from the liquid crystal display terminal on which the quantum dot film was mounted, and were required to face the liquid crystal display terminal of the WORTH four-point optotype. Using the same quantum dot liquid crystal display terminal as in example 1, the subject was required to wear conventional red-green complementary glasses. The testees were asked to test the vision test of blocking the green lens (left eye) and the vision test of blocking the red lens (right eye), and to test the vision test of both eyes, and the test results stated subjectively by 10 testees were recorded, and the results are shown in table 2.

TABLE 2

Comparative example 1

In example 1, 10 subjects were tested, and the subjects stood 5.0m from a normal (non-quantum dot) liquid crystal display terminal and were required to face a liquid crystal display terminal with a WORTH four-point optotype. The test subject is required to wear conventional red-green complementary glasses. The test results of the test subjects who were asked to block the green lens (left eye) for viewing the optotypes, block the red lens (right eye) for viewing the optotypes, and test the condition of viewing the optotypes with both eyes are shown in table 3 below.

TABLE 3

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the common liquid crystal display terminal used in comparative example 1 is such that the examinee can see the cross symbol while blocking his left eye and the rhombus symbol while blocking his right eye, and thus the visual acuity test effect is poor. Example 3 was not fitted with an additional filter, so that many subjects still could see a slight cross, but the results were improved compared to the conventional liquid crystal display terminal of comparative example 1. The test person No. 2 can not see the green image, and the test person No. 5 has the same conclusion after verification as before test. The above embodiments and comparative examples illustrate that the liquid crystal display terminal including the quantum dot backlight module can improve the accuracy of the test, and at the same time, further solve the problem of accuracy degradation due to light leakage by introducing an additional optical filter.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The liquid crystal display terminal comprises a quantum dot backlight module, the liquid crystal display terminal is used for WORTH four-point visual target testing, and the quantum dot backlight module comprises red quantum dots and green quantum dots.

2. The liquid crystal display terminal according to claim 1, wherein the peak wavelength of the green quantum dots is between 510nm and 550nm, preferably 520 and 540nm, and most preferably 527 and 535 nm.

3. The liquid crystal display terminal according to claim 1, wherein the peak wavelength of the red quantum dots is 610nm-660nm, preferably 620-640nm, and most preferably 623-632 nm.

4. A liquid crystal display terminal according to claim 3, the green quantum dots having a half-peak width within 40nm, preferably within 30nm, most preferably within 22 nm; the half-peak width of the red quantum dots is within 40nm, preferably within 30nm, and most preferably within 22 nm.

5. The liquid crystal display terminal of claim 1, the quantum dot backlight module comprising a quantum dot film sheet or a quantum dot LED package.

6. A vision testing method, wherein the used testing equipment is a liquid crystal display terminal, the liquid crystal display terminal is the liquid crystal display terminal as claimed in the claim 1-5, and the liquid crystal display terminal presents a WORTH four-point visual target during testing, and the WORTH four-point visual target comprises a red visual target, a green visual target and a white visual target.

7. The vision testing method of claim 6, comprising wearing red-green complementary glasses on the subject, wherein the red-green complementary glasses comprise a red lens and a green lens, and a flip-open first filter is disposed in front of the red lens, and the first filter is used for blocking light in a wavelength band of 600nm-680nm or passing light in a wavelength band of 510nm-550 nm.

8. The vision testing method of claim 6, wherein a second optical filter is attached to a screen position corresponding to the green optotype during testing, so that the second optical filter completely covers the green optotype but does not cover the white optotype and the red optotype.

9. The vision testing method of claim 8, wherein the peak wavelength of the green quantum dots is A, and the second filter can pass wavelengths within 5% of A.

10. The vision testing method of claim 6-9, wherein the light leakage energy density of the LCD terminal is 0.03W/m²The following.