A Correction Method for Crosstalk Effect of Phase-type Spatial Light Modulator Applied in Holographic Display
A spatial light modulator and holographic display technology, applied in the field of holographic display, to achieve the effects of low noise, high contrast, and fast measurement speed
Active Publication Date: 2021-06-15
ZHEJIANG UNIV
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[0009] The purpose of the present invention is to solve the holographic display quality problem caused by the crosstalk effect of the phase spatial light modulator, and design a method for correcting the crosstalk effect of the phase spatial light modulator applied to the holographic display
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[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] A method for correcting the crosstalk effect of a phase-type spatial light modulator applied to a holographic display proposed by an embodiment of the present invention includes:
[0036] (1) Using a phase-type spatial light modulator to display a binary grating with a period of two pixels, keeping the average value of the phase of the binary grating unchanged, measuring the diffraction efficiency of zero-order light with different phase differences, and obtaining the diffraction efficiency as the binary grating Diffraction efficiency curve η of phase difference change 0 (Δθ);
[0037] Such as figure 1 As shown, the diffraction efficiency curve η 0 In (Δθ), between the maximum value and the first zero point, the phase difference when the diffraction efficiency value is equal to the second peak of the diffraction efficiency c...
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The invention discloses a method for correcting the crosstalk effect of a phase-type spatial light modulator applied to holographic display. The phase-type spatial light modulator is used to display a binary grating with a period of two pixels, and the phase average value of the binary grating is kept unchanged. , measure the diffraction efficiency of the zero-order light with different phase differences, and obtain the diffraction efficiency curve of the diffraction efficiency changing with the phase difference of the binary grating; according to the diffraction efficiency curve, the dual-phase encoding hologram after the crosstalk effect correction is obtained. The invention only needs to measure the diffraction efficiency curve, the required experimental device is simple, and the measurement speed is fast. Improvements to bi-phase encoding do not add extra computation time, and are suitable for real-time holographic display. By judging whether the calculated bi-phase value exceeds the range, if it exceeds, modifying the bi-phase value can ensure that the bi-phase value is within the display range of the phase-type spatial light modulator. Correcting for crosstalk effects displays images with higher contrast and lower noise.
Description
technical field [0001] The invention belongs to the technical field of holographic display, in particular to a method for correcting the crosstalk effect of a phase-type spatial light modulator applied to holographic display. Background technique [0002] Three-dimensional display technology is an important research and development direction of display technology. In recent years, due to the popularization and application of VR and AR technologies, research on head-mounted display devices has gradually increased. Among them, the holographic near-eye display has received extensive attention. [0003] Holographic near-eye displays have depth information in principle and thus have potential advantages in future near-eye display applications. In order to display a hologram, it is desirable to modulate the amplitude and phase of the light simultaneously. But it's hard to do with just one spatial light modulator. An experimentally feasible approach is to use an encoding method...
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IPC IPC(8): G03H1/02
CPCG03H1/02
Inventor 李海峰张隽怿刘旭
Owner ZHEJIANG UNIV