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A method for adjusting the definition of an e-visual standard and a display

An adjustment method and display technology, which are applied in the field of E optotype display, can solve problems such as affecting the accuracy of vision detection, and achieve the effects of improving the accuracy of vision detection, reducing edge blur, and high display clarity.

Active Publication Date: 2021-12-14
NANJING TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for adjusting the definition of E visual mark and display to solve the problem that the edge blurring phenomenon of "E" easily appears in the prior art and affects the accuracy of visual acuity detection

Method used

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  • A method for adjusting the definition of an e-visual standard and a display
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  • A method for adjusting the definition of an e-visual standard and a display

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Effect test

Embodiment 1

[0049] Designed a 23.8-inch LCD eye chart with a resolution of 1080P. The width and height of the display panel are 527.04mm and 296.46mm respectively, and the pixels are square. The pixel pitch can be calculated from the ratio of the height of the display panel to the vertical resolution, that is, the initial pitch L=296mm / 1080=0.2745mm. H is the height of the horizontal stroke, and 5H is the target height of the E visual target.

[0050] Observing the multi-line E visual target, it can be found that the smaller the font, the more obvious the blurred edge. First, select the smallest number 14 visual target in the national standard GB / T 11533-2011 for judgment and adjustment. The target height 5H is 3.64 mm. K=H / L=2.652 can be obtained, that is, the display of the horizontal stroke of the E visual mark requires 2 full pixels and 0.652 single pixels, because the pixel is the smallest display unit of the display panel, and there are only two display effects: bright or not brigh...

Embodiment 2

[0056] Considering the acceptability of the human eye to the display effect, the range of P value can be appropriately expanded (the result of non-optimal adjustment), so that K2≤5% or K2≥98% of the adjusted visual mark-to-dot distance ratio, that is Expand to P=(K2-0.05)*L / H, a=0.05, or P=1-(L-(K2+0.02)*L) / H, b=0.02. When L'=0.2410mm, the No. 10 E visual target does not meet the best matching pixel pitch of the visual target, and the height of the visual target can be adjusted so that within the range of K2≤5% or K2≥98%, it can satisfy the blurring of the human eye For the minimum visual effect of resolution, record the P5 value at L=0.2410mm and the adjusted height value of the E visual mark H3 in Table 2. The height of the adjusted E sight mark can be obtained as shown in Table 2, and the unit of the height in the table is mm.

[0057] Table 2

[0058]

[0059]

[0060] This group of E visual marks completely matches the pixel pitch, completely displays black stroke...

Embodiment 3

[0062]For a 27-inch display, the best resolution is 2K, that is, 2560×1440, its viewing area is 596.736mm×335.664mm, and its initial pixel pitch is 0.2331mm. Its P value is denoted as P4, see Table 1 above. Judging that all P values ​​meet the requirements, the height of the adjusted visual target is H2, see Table 1 above.

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Abstract

The invention provides a method for adjusting the clarity of an E-optotype and a display for displaying the E-optotype. The method for adjusting the clarity of the E visual mark calculates the deviation between the target parameters of the E visual mark and the parameters calculated by the integer pixel distance of the actual display, and then adjusts, so that the strokes of the E visual mark can be close to or completely in the form of an integer number of pixels in the display. show. Therefore, the edge blurring of the E visual mark can be reduced, thereby improving the accuracy of visual acuity detection.

Description

technical field [0001] The invention relates to the technical field of E-optotype display, in particular to a method for adjusting the definition of an E-optotype and a display. Background technique [0002] As the country pays more attention to the myopia rate of adolescents and children, eye charts, as a tool for testing eyesight, are more digitalized and standardized in response to market demand. LCD eye charts are favored by more and more vision testing institutions. Compared with the traditional eye chart, the liquid crystal display eye chart has the advantages of high brightness, good brightness uniformity, less influence by ambient light, various test methods, and convenient data analysis of test results. However, the liquid crystal display panel is composed of many millimeter-scale pixels, and the edge blurring of the word "E" is prone to occur, which affects the accuracy of vision detection. Contents of the invention [0003] The object of the present invention i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/32
CPCG09G3/3607G09G3/32
Inventor 罗飞康永印蔡景友刘明
Owner NANJING TECH CORP LTD
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