Pixel Drive Circuit Transistor Width-to-Length Ratio Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing display technologies face challenges in achieving full-screen displays due to the need for components like cameras and sensors, which disrupt the consistency of the display screen, leading to issues with uniform brightness and increased complexity in drive capability requirements.
Innovation Solution
The proposed solution involves a pixel drive circuit design where the width-to-length ratio of the drive transistor in each sub-pixel is adjusted to ensure that the drive current is directly proportional to the gray scale, allowing for uniform brightness across sub-pixels of the same color, and the sampling and drive transistors are configured to prevent short-circuiting as diodes, optimizing the capacitance and charging saturation of storage capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If components such as camera, sensor, earpiece are mounted in upper portion of display screen, then these components can be integrated into mobile terminal, but the overall consistency of display screen is affected and full-screen display cannot be achieved
Solution Approach 1:
The patent extracts the camera, sensor, and earpiece components from the upper portion of the display screen and relocates them to the lower portion. This allows the upper display area to maintain full-screen consistency while still integrating all necessary components into the mobile terminal.
2Illumination intensity
If width-to-length ratio of drive transistor is adjusted to be in direct proportion to drive current, then uniform brightness can be achieved across sub-pixels, but the complexity of pixel drive circuit design increases
Solution Approach 1:
The patent applies local quality by setting different width-to-length ratios for drive transistors in different sub-pixels based on their specific drive current requirements. Each sub-pixel's drive transistor is optimized locally to achieve uniform brightness across the entire display, with the ratio being directly proportional to the drive current.
Solution Approach 2:
The patent changes the physical parameter of the drive transistor's width-to-length ratio to control the drive current. By adjusting this geometric parameter in direct proportion to the required drive current, the patent achieves uniform brightness without requiring complex additional circuitry.
3Device complexity
If sampling transistor and drive transistor are short-circuited as diodes in working phase, then circuit structure is simplified, but charging saturation of storage capacitor varies across sub-pixels causing brightness non-uniformity
Solution Approach 1:
The patent applies local quality by configuring different width-to-length ratios for drive transistors in different sub-pixels. This compensates for the varying charging saturation effects that occur when transistors are short-circuited as diodes, ensuring that each sub-pixel achieves the same brightness level despite the simplified circuit structure.
Data Source
AI summary
The present disclosure provides a display device and a display panel thereof, and a pixel drive circuit of a display panel. By changing a width-to-length ratio of a drive transistor in the pixel drive circuit of each sub-pixel, or changing a capacitance of a storage capacitor at the same time, such that: under the same gray scale, the width-to-length ratio of a drive transistor of each sub-pixel in same color is in direct proportion to a drive current; or at the same time a charging saturation of a storage capacitor of each sub-pixel in same color is the same, and the capacitance of the storage capacitor of each sub-pixel in same color is in direct proportion to the drive current, and the charging saturation is a difference value between an actual charging voltage and a theoretical charging voltage of the storage capacitor when a charging phase ends.