Display Device Signal Processing Circuit for HSV Color Space Expansion
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Solution Overview
Problem
Existing display devices struggle to maintain image quality when expanding the HSV color space, as changes in light source intensity can be recognized by viewers, and existing control methods are not suitable for expanded color spaces.
Innovation Solution
A display device with a signal processing unit that converts input HSV signals into an extended HSV color space, using a fourth sub-pixel to expand the color space, and a signal processing circuit that calculates an extension coefficient to control the luminance of the image display panel, with filtering processing based on threshold values to adjust light-source device control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light amount of the light source is changed to expand the HSV color space, then the image brightness is improved, but the image quality is degraded because the change is recognizable by the image viewer
Solution Approach 1:
The patent applies dynamics by making the time constant for filtering the light source control signal variable rather than fixed. The time constant is dynamically adjusted based on the control signal magnitude: a first time constant is used when the control signal is below a threshold, and a second time constant is used when it exceeds the threshold. This dynamic adjustment allows the system to adaptively manage light source intensity changes, preventing recognizable fluctuations that would degrade image quality while still enabling brightness enhancement through HSV color space expansion.
2Illumination intensity
If the light amount of the light source is increased to achieve brighter images, then the image brightness is improved, but the power consumption of the light-source device is increased
Solution Approach 1:
The patent applies parameter changes by modifying the HSV color space parameters (specifically the Value/brightness component) to achieve brighter images without proportionally increasing light source power. By extending the HSV color space and adjusting the extension coefficient, the system can display brighter images while controlling the light source more efficiently. Additionally, the filtering mechanism with variable time constants further optimizes power consumption by smoothing light source intensity changes and preventing unnecessary power fluctuations.
3Adaptability or versatility
If the light amount of the light source is changed to expand the color space, then the color reproduction capability is improved, but the image stability is degraded due to recognizable changes
Solution Approach 1:
The patent applies beforehand cushioning by implementing a filtering mechanism that smooths the light source control signal before it reaches the light source device. The filter uses a time constant to cushion or dampen rapid changes in the control signal, preventing sudden light intensity fluctuations that would be recognizable to viewers. This prior cushioning of the control signal ensures that color space expansion can be achieved while maintaining image stability and preventing noticeable artifacts or flickering.
Data Source
AI summary
According to an aspect, a display device includes: an image display panel; a signal processing unit; and a signal processing circuit. The signal processing unit calculates an extension coefficient α for an input signal, calculates an output signal of a first sub-pixel, calculates an output signal of a second sub-pixel, calculates an output signal of a third sub-pixel, calculates an output signal of a fourth sub-pixel, and calculates a control signal. The signal processing circuit performs filtering processing on the control signal by a set first time constant to calculate and output a light-source device control signal, when the control signal is smaller than a set threshold value, and performs filtering processing on the control signal by a set second time constant to calculate and output the light-source device control signal, when the control signal is equal to or larger than the threshold value.