Dual-Drive Pixel Circuit for Under-Display Camera Brightness
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Solution Overview
Problem
The low pixel density region in display panels with under-screen cameras has lower luminance due to lower pixel density, affecting display quality and brightness, which is not adequately addressed by existing technologies.
Innovation Solution
A pixel circuit with two driving circuits for each light-emitting element in the low pixel density region, allowing increased driving current and brightness, using transistors like P-type thin film transistors to enhance luminance uniformly across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a transmissive liquid crystal display is used, then the display can be made thinner and lighter, but the response time becomes slower and viewing angles become narrower
Solution Approach 1:
The liquid crystal display is divided into multiple sub-pixels (red, green, blue) arranged in a specific pattern, with each sub-pixel having independent control electrodes. This segmentation allows for optimized control of each color component, improving overall response time while maintaining thin design
Solution Approach 2:
The patent employs dynamic control mechanisms including overdrive voltage adjustment and responsive compensation circuits that adapt to different grayscale transitions. The voltage control system dynamically adjusts driving parameters to accelerate liquid crystal molecule reorientation, reducing response time in thin display structures
2Weight of stationary object
If a transmissive liquid crystal display is used, then the display can be made thinner and lighter, but the viewing angle becomes narrower
Solution Approach 1:
The patent implements compensation films with specific optical characteristics positioned at different locations relative to the liquid crystal layer. These films have varying refractive indices and optical axes oriented at specific angles to compensate for viewing angle dependence locally across different viewing directions, expanding effective viewing angles in thin display configurations
Solution Approach 2:
The liquid crystal alignment layers and compensation films are configured with asymmetric optical properties to counteract the symmetric viewing limitations of standard transmissive LCDs. The dual-domain vertical alignment structure creates asymmetric light propagation paths that broaden viewing angles
3Manufacturing precision
If the pixel circuit area is reduced to increase pixel density, then the display resolution improves, but the liquid crystal switching capacity becomes insufficient
Solution Approach 1:
The pixel circuit components are nested within the pixel area in a compact arrangement where the compensation circuit is integrated alongside the switching transistor and storage capacitor. This nested configuration maximizes the use of available pixel area, enabling higher pixel density while maintaining sufficient circuit capacity for liquid crystal switching
Solution Approach 2:
The patent extends the circuit layout into the vertical dimension by stacking certain circuit elements above or below the liquid crystal layer in three-dimensional integration. This dimensional transition allows more circuit functionality to be packed into the same planar pixel area, maintaining switching capacity while increasing pixel density
4Manufacturing precision
If the pixel circuit area is reduced to increase pixel density, then the display resolution improves, but the grayscale expression capability becomes insufficient
Solution Approach 1:
The compensation circuit is pre-configured with specific capacitance values and resistance ratios that are optimized during manufacturing to provide appropriate grayscale voltage division. This preliminary design ensures that even in reduced pixel areas, the circuit can generate the necessary number of grayscale levels for accurate image representation
Solution Approach 2:
The patent optimizes key circuit parameters including capacitor ratios, resistor values, and transistor width-to-length ratios to maintain grayscale expression capability in compact pixel designs. By carefully adjusting these parameters, the circuit achieves adequate grayscale levels despite reduced area available for component placement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution increases brightness in the low pixel density region, reducing luminance unevenness and improving display quality by doubling the driving current, thus enhancing the overall display effect.
Implementation Method 1
the liquid crystal 130 changes its molecular arrangement according to the voltage applied thereto
Implementation Method 2
the compensation film 170 compensating for a viewing angle dependence of the liquid crystal display
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A pixel circuit, a display substrate, a display panel, and a display device. The pixel circuit comprises: a first driving circuit, a second driving circuit, a first light emitting control circuit, a second light emitting control circuit, a storage circuit, and a data writing circuit. The first light emitting control circuit is configured to control connection or disconnection between the first driving circuit and a light emitting element and control connection or disconnection between the first driving circuit and a first power supply line; the second light emitting control circuit is configured to control connection or disconnection between the second driving circuit and the light emitting element and control connection or disconnection between the second driving circuit and a second power supply line; the data writing circuit is configured to write a data voltage into the first driving circuit; the first driving circuit and the second driving circuit are configured to control, on the basis of the same data voltage, a driving current driving the light emitting element to emit light; the storage circuit is configured to maintain voltages of a control end of the first driving circuit and a control end of the second driving circuit.